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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publisher：社）可視化情報学会  

CiNii Books

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J-GLOBAL

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J-GLOBAL

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Verlag  

This paper presents a two-dimensional (2D)–three-dimensional (3D) hybrid stabilized finite element method that enables us to predict a propagation process of tsunami generated in a hypocentral region, which ranges from offshore propagation to runup to urban areas, with high accuracy and relatively low computational costs. To be more specific, the 2D shallow water equation is employed to simulate the propagation of offshore waves, while the 3D Navier–Stokes equation is employed for the runup in urban areas. The stabilized finite element method is utilized for numerical simulations for both of the 2D and 3D domains that are independently discretized with unstructured meshes. The multi-point constraint and transmission methods are applied to satisfy the continuity of flow velocities and pressures at the interface between the resulting 2D and 3D meshes, since neither their spatial dimensions nor node arrangements are consistent. Numerical examples are presented to demonstrate the performance of the proposed hybrid method to simulate tsunami behavior, including offshore propagation and runup to urban areas, with substantially lower computation costs in comparison with full 3D computations.

DOI： 10.1007/s00466-016-1300-4

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents a visualization system based on augmented reality technology for environmental flow problem. The 2D marker-less method using a landscape image for the studied site is employed for the positioning method for the virtual image and real image. The present system is applied to the flow visualization for the air flow simulation around the building in urban area. The validity and applicability is investigated through the application examples. From the results, the present system is shown to be a useful tool for AR visualization of environmental flow simulation.

DOI： 10.2208/jscejcei.71.I_196

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents a numerical simulation method for transient acoustic field analysis based on boundary element method and its application to the auralization of road traffic noise. For the governing equation, the unsteady wave equation is employed. In order to solve a large scale problem, the fast multipole boundary element method (FMM) is applied. Three dimensional wave scattering problem with a road trafic noise is solved by the time domain FM-BEM. The auralization is investigated by using the computed sound pressure.

DOI： 10.2208/jscejam.71.I_311

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents a simulation method based on the wave-acoustic theory and its application to the auralization of traffic noise. The CIP method using adaptive mesh refinement (AMR) is employed for solving the governing equation accurately. In order to obtain the accurate numerical solution by CIP method for the propagation of an impulse wave, an imitation impulse developed by Lubich is employed. The auralization of traffic noise is performed by the convolution using the results and the sound source data. The present method is applied to three-dimensional wave propagation problems in order to investigate the validity of the method. The present method is shown to be an useful tool to investigate the traffic noise.

DOI： 10.2208/jscejam.71.I_349

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The tsunami caused by the great east Japan earthquake lead to collapse infrastructures including bridge and breakwater. It is important to reconsider disaster prevention and mitigation techniques towards next millennium tsunami. Currently, most of local governments in Japan are promoting the selection and specification of tsunami refuge buildings for people who live in the difficult area to evacuate within the limited time. However it's difficult to settle the design code of tsunami refuge building because there are so many incertitude accident during tsunami related to water induced impact force, buoyancy force, tumble of the building and so on. Numerical simulation by a particle method has been conducted for the evaluation of tsunami fluid force acting on tsunami refuge building as a first step. Finally, efficiency and adequacy of numerical simulation in the design of tsunami fluid force has been discussed by comparing with the current design code in Japan.

DOI： 10.2208/jscejam.70.I_649

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents an interactive 3D unstructured mesh modification system using virtual reality (VR) technology. The mesh quality is evaluated and the quality is improved by the node relocation and mesh refinement. The user can change the position of nodes and refine the element in VR space by using a handy controller. The software is developed by VR programming languages; Open GL and CAVE library. The present system is applied to the mesh modification for the simulation of 3D solid analysis and is shown to be a useful tool to assist the high quality computing.

DOI： 10.2208/jscejam.70.I_339

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents a road-traffic noise evaluation system using virtual reality technology. In order to provide an experiencing person with a virtual world with so much presence, the 3-D acoustic spatialization using Ambisonics techniques is employed. A complex acoustic field under mixed traffic is reconstructed in VR space. Therefore, it is able to understand and assess traffic noise intuitively, around various environments such as building complex, tunnels, elevated structures and so on. This system is applied to several examples in order to investigate the validity of the method.

DOI： 10.2208/jscejam.70.I_195

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents a numerical method based on CIVA-Stabilized finite element method (CIVA-SUPG) for tsunami simulations. The Boussinesq equation is employed for the governing equation of motion. The equation system is divided into two phases; an advection phase and a non-advection phase. The equations for advection phase are solved by CIVA method, and the equations for non-advection phase are solved by a stabilized finite element method based on SUPG method. The present method is applied to several numerical examples to show the validity and efficiency.

DOI： 10.2208/jscejam.70.I_349

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Publishing type：Research paper (international conference proceedings)  

On March 11, 2011, the huge Tsunami caused by the great east Japan earthquake devastated the Pacific coast of north-eastern Japan. Many infrastructures including bridges were collapsed by the Tsunami. New generation of Tsunami disaster prevention and mitigation method should be reconsidered toward the next millennium Tsunami. In this study, a stabilized Smoothed Particle Hydrodynamics (SPH) has been utilized for an evaluation of fluid force acted on bridge girders. In addition, a new boundary treatment using a virtual marker and fixed boundary particle is developed to satisfy the slip and no-slip boundary condition for the velocity field and to satisfy the pressure Neumann condition at the same time. The accuracy and efficiencies of our proposed method are validated by comparison between a numerical solution and experimental results. Finally, a simple treatment for the particle method has been introduced to our developed SPH tool to simulate wash out of the bridge girder.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE  

This paper proposes a method for simulating compressive failure in quasi-brittle materials involving micro- or meso-scale contact on crack interfaces. The macroscopic compressive failure is assumed to be caused by tensile and shear fractures at micro-scale, both of whose traction-crack-opening behavior is represented by the cohesive crack model. The penalty method is employed to realize the frictional contact on cracked interfaces under compressive loading. First, the discrete micro-crack behavior is introduced to a finite element framework in consideration of material inhomogeneity of cement-based materials and by using penalty springs. Then, after verifying the basic performance for simulating fracture behavior involving tensile or shear cracks, we examine the role of the micro-scale frictional contact behavior on the compressive fracture behavior. Finally, a numerical example is presented to demonstrate the validity of the proposed method in comparison with the experimental result, reported in the literature, for the compressive fracture behavior in mortar and cement paste.

DOI： 10.11421/jsces.2014.20140006

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Computational Engineering and Science  

This paper proposes a method for simulating compressive failure in quasi-brittle materials involving microor meso-scale contact on crack interfaces. The macroscopic compressive failure is assumed to be caused by tensile and shear fractures at micro-scale, both of whose traction-crack-opening behavior is represented by the cohesive crack model. The penalty method is employed to realize the frictional contact on cracked interfaces under compressive loading. First, the discrete micro-crack behavior is introduced to a finite ele- ment framework in consideration of material inhomogeneity of cement-based materials and by using penalty springs. Then, after verifying the basic performance for simulating fracture behavior involving tensile or shear cracks, we examine the role of the micro-scale frictional contact behavior on the compressive fracture behavior. Finally, a numerical example is presented to demonstrate the validity of the proposed method in comparison with the experimental result, reported in the literature, for the compressive fracture behavior in mortar and cement paste. © 2014 by the Japan Society for Computational Engineering and Science.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：World Scientific Publishing Co. Pte Ltd  

VFIVE is a scientific visualization application for CAVE-type immersive virtual reality (VR) systems. The source codes are freely available. VFIVE is used as a research tool in various VR systems. It also lays the groundwork for developments of new visualization software for CAVEs. In this paper, we pick up five CAVE systems in four different institutions in Japan. Applications of VFIVE in each CAVE system are summarized. Special emphases will be placed on scientific and technical achievements made possible by VFIVE. © 2013 World Scientific Publishing Company.

DOI： 10.1142/S1793962313400047

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER  

We show that combination of the Deforming-Spatial-Domain/Stabilized Space-Time and the Streamline-Upwind/Petrov-Galerkin formulations can be used quite effectively for computation of shallow-water flows with moving shorelines. The combined formulation is supplemented with a stabilization parameter that was originally introduced for compressible flows, a compressible-flow shock-capturing parameter adapted for shallow-water flows, and remeshing based on using a background mesh. We present a number of test computations and provide comparisons to theoretical results, experimental data and results computed with nonmoving meshes.

DOI： 10.1007/s00466-011-0618-1

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-BLACKWELL  

We present a new space-time SUPG formulation of the shallow-water equations. In this formulation, we use a stabilization parameter that was introduced for compressible flows and a new shock-capturing parameter. In the context of two test problems, we evaluate the performance of the new shock-capturing parameter. We also evaluate the performance of the space-time SUPG formulation compared to the semi-discrete SUPG formulation, where the system of semi-discrete equations is solved with the central-difference (Crank-Nicolson) time-integration algorithm. Copyright (C) 2010 John Wiley & Sons, Ltd.

DOI： 10.1002/fld.2464

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WORLD SCIENTIFIC PUBL CO PTE LTD  

In order to deal with the kinematic and dynamic boundary conditions in the Eulerian framework, we develop an Eulerian finite cover method (FCM) for large deformation solid dynamics by incorporating the approximation strategy of the FCM into the existing Eulerian explicit finite element method. The operator split method is employed to solve Eulerian solid dynamics problems, and the resulting numerical algorithm consists of two steps. One is the nonadvective step, in which the standard Lagrangian FC analysis is carried out with the explicit time integration scheme, and the other is the advective step, in which the CIVA method is applied to project the solution obtained in the nonadvective step to the Eulerian mesh. Two representative numerical examples are presented to validate the proposed Eulerian FCM and demonstrate its capability especially in appropriately treating the kinematic and dynamic boundary conditions.

DOI： 10.1142/S0219876210002052

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：RESEARCH PUBLISHING SERVICES  

DOI： 10.3850/9789810844554-0041

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Erosion Control Engineering  

The authors developed a debris flow simulator by Finite Element Method which could properly computes the process of erosion and sediment around slit type Sabo dam. In the simulator, shallow water wave equation describes debris flow and stabilized FEM is used as a method of discretization. There are two ways to define unknown in continuous equation of shallow water wave. One, the difference between reference surface and water surface is set as unknown (Way I), and the other is water depth itself as unknown (Way II). When simulator is applied to Way II, it might produce unreasonable high water depth in the discontinuous zone such as dams. This is because the diffusion effect of shock capturing term distributes water depth to the neighbor nodes counter to irregular water surface. In order to resolve this problem, the authors propose an alternative definition of reference surface used in Way I. The new definition keeps the surface evenly in the discontinuous zone which produces uneven surface in usual manner. Proposed reference surface reduces unrealistic high water depth in the discontinuous zone and stabilizes calculation process. A hydraulic experiment with slit-type Sabo dam miniature was used to verify the proposed method and qualitatively consistent result was showed. In addition, a full-scale grid type Sabo dam was simulated and comparison was made between the varying slit widths. With one more study cases, changes of flow around Sabo dams and of riverbed were calculated adequately, the validity and effectiveness of the debris flow simulator by FEM are proved in this paper.

DOI： 10.11475/sabo.62.1_11

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This paper presents a simulation system for the disaster evacuation based on multi-agent model considering geographical information. This system consists of three parts, the modeling for the land and buildings using GIS data, the analysis of disaster evacuation using multi-agent model, and the visualization for the numerical results using the virtual reality technique. By introducing the numerical solver of the natural disaster to the present system, it is possible to evaluate not only the damage of structure but also the damage of human being. Furthermore, it is possible to investigate the appropriate evacuation route by the simulation. The Dijkstra algorithm is used to obtain shortest route to the refuge. In addition, the visualization using virtual reality technique is curried out to understand the feeling of refugee. The present system is applied to the evacuation analysis by the flood flow in urban area and is shown to be a useful tool to investigate the damage by natural disasters. © 2008 Tsinghua University Press.

DOI： 10.1016/S1007-0214(08)70173-1

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A large-scale finite element modeling, simulation and visualization for wind flows are presented. The modeling method using GIS/CAD data is employed. The stabilized parallel finite element method based on SUPG/PSPG method is employed for the analysis of wind flows. The present method is applied to the simulation of wind flow and contaminant spread in urban area. The visualization based on virtual reality is employed to evaluate the mesh quality and computational results. The computed results are qualitatively in agreement with the experimental results and actual phenomena. The present method is shown to be a useful tool to simulate the wind flows in urban area. © 2008 Tsinghua University Press.

DOI： 10.1016/S1007-0214(08)70131-7

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This paper presents an urban modeling system using CAD/GIS data for atmosphere environmental simulation, such as wind flow and contaminant spread in urban area. The CAD data is used for the shape modeling for the high-storied buildings and civil structures with complicated shape since the data for that is not included in the 3D-GIS data accurately. The unstructured mesh based on the tetrahedron element is employed in order to express the urban structures with complicated shape accurately. It is difficult to understand the quality of shape model and mesh by the conventional visualization technique. In this paper, the stereoscopic visualization using virtual reality (VR) technology is employed for the verification of the quality of shape model and mesh. The present system is applied to the atmosphere environmental simulation in urban area and is shown to be an useful planning and design tool to investigate the atmosphere environmental problem. © 2008 Tsinghua University Press.

DOI： 10.1016/S1007-0214(08)70183-4

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Language：Japanese   Publisher：Japan Society of Civil Engineers  

This paper presents a large-scale finite element modeling and visualization for wind flows. The modeling method using GIS/CAD data is developed to prepare the accurate urban model. The visualization based on virtual reality is applied to evaluate the mesh quality and computational results. The present method is shown to be a useful tool to simulate the wind flows in urban area.

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Other Link： https://jlc.jst.go.jp/DN/JALC/10014297808?from=CiNii

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-BLACKWELL  

This paper describes an Eulerian formulation for large deformation solid dynamics. In the present Eulerian approach, an advective equation is solved using the Stream-Upwind/Petrov-Galerkin finite element method. The Eulerian finite element method is applied to path-dependent solid analyses such as impact bar and ductile necking problems. These computational results using the Eulerian finite element method are compared with the results obtained from using the Lagrangian finite element method and an Eulerian formulation based on a finite difference method. Copyright (c) 2007 John Wiley & Sons, Ltd.

DOI： 10.1002/nme.2057

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Landslide Society  

Landslide is one of the main natural disasters in which human life and social properties are lost. A prediction of a dangerous area of landslide is the most important and necessary to prevent the sediment related disasters. On this purpose we examine an analytical technique by a finite element method to predict the running out extent area and sediment height of sliding mass. The instability of numerical solution is seen by the analysis of finite element method on shallow water equation describing landslide movement. On this account we present CIVA-stabilized Finite Element Method that analyzes the advection term exactly.<BR>The movement of landslide mass is influenced by scatter stress with it and basal resistance force which needs to handle discontinuity at the beginning and the ending of the movement. Then we consider the move and stop condition into the numerical simulation. We analyze the problems of various kinds of advection model and a real landslide disaster, and show the effectiveness and the propriety of present technique.

DOI： 10.3313/jls.42.3_205

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-BLACKWELL  

This paper presents a computational technique based on the finite element method for the orographic wind flow and rainfall. The governing equations are the unsteady Navier-Stokes equations based on Boussinesq approximation and the Kessler model for warm rain. The SUPG/PSPG method is employed for the stabilization method. The automatic mesh generation method using GIS data is utilized to develop an accurate geographic model. The present method is applied to the analysis of orographic wind flow and rainfall past a semicircular hill and an actual mountain area. Copyright (C) 2004 John Wiley Sons, Ltd.

DOI： 10.1002/fld.832

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TSINGHUA UNIV PRESS  

A large-scale finite element simulation and modeling method is presented for environmental, flows. The accurate shape model for landform and buildings was prepared by the integration of several GIS and CAD data and an automatic mesh generation method based on Delaunay method was developed. The stabilized parallel finite element method based on SUPG/PSPG method was employed. The present method was applied to the simulation of flood and wind flows. The present method is shown to be a useful planning and design tool for the natural disasters and the change of environments.

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DOI： 10.2208/proce1989.51.36

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE COMPUTER SOC  

A large-scale finite element simulation and modeling method for environmental flows is presented. The stabilized parallel finite element method based on SUPG/PSPG method was employed. The present method was applied to the simulation of windflows and rainfall in mountain and urban area. Several GIS and CAD data were used for the. preparation of shape model and an automatic mesh generation method based on Delaunay method was developed. The present method is shown to be a useful planning and design tool for the natural disasters and the change of environments.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

This paper presents a parallel finite element method for free-surface flow based on level set. method. For the stabilization technique, the SUPG/PSPG (streamline upwind / Petrov-Galerkin and pressure stabilizing / Petrov-Galerkin) is employed. The advection equation is applied to determine the distance from the interface. In order to evaluate the level set function more accurately, the re-initialization and the volume correction techniques are applied. Parallel implementation based on domain decomposition method and MPI is carried out on a PC cluster. For the numerical example, the Present method is applied to the broken-dam problem. The effect of parallelization on the efficiency of the computation is also examined.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ELSEVIER SCIENCE BV  

This paper presents a parallel finite element method for the analysis of orog raphic wind flow and rainfall. The Kessler model, which is the model for warm rain, was used for the governing equation. For the governing equation of wind flow, the unsteady Navier-Stokes equation based on Boussinesq approximation was used. The SUPG and PSPG methods were uemployed for the stabilization method. Parallel implementation based on domain decomposition method and MPI was carried out on a PC cluster. The present method was applied to the analysis of orographic wind flow and rainfall past a semicircular hill and an actual mountain area. The effect of parallelization on the efficiency of the computation was also examined.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JOHN WILEY & SONS LTD  

This paper presents a parallel finite element method for the analysis of the sloshing problem caused by earthquakes. The incompressible Navier-Stokes equation based on Arbitrary Lagrangian-Eulerian description is used as the governing equation. The SUPG/PSPG formulation is employed to improve the numerical stability and the accuracy. Parallel implementation of the unstructured grid based formulation was carried out on a PC cluster. The present method was applied to analyse the sloshing problem of a rectangular tank and an actual reservoir. The effect of parallelization on the efficiency of the computations was examined using a number of different network environments. Copyright (C) 2002 John Wiley Sons, Ltd.

DOI： 10.1002/cnm.527

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

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A parallel finite element method based on domain decomposition method is presented for large-scale computation of incompressible Navier-Stokes flow. The finite element computations, carried out using unstructured grids, are based on semi-implicit formulation. The pressure Poisson equation, which consume the most of computational time, is completely parallelized using element-by-element SCG method. The present method is shown to be a useful and powerful tool for the large-scale computation of incompressible Navier-Stokes flow.

DOI： 10.2208/jscej.2001.668_43

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA  

This paper presents a parallel finite element method for the large scale computation of incompressible Navier-Stokes flows using unstructured grids. The streamline upwind/Petrov-Galerkin (SUPG) formulation is employed to improve the numerical stability and accuracy and the pressure stabilization matrix (PSM) is introduced to avoid the occurrence of the checkerboard pressure mode. For the finite element, the velocity-tri-linear/pressure-piecewise constant (Q1/P0) element is employed. The pressure Poisson equation is parallelized with the element-by-element scaled conjugate gradient (SCG) method. Parallel implementation of the unstructured-grid-based formulation is carried out on the Hitachi Parallel Computer SR2201. The effect of parallelization on the efficiency of the computations is examined. (C) 2000 Elsevier Science S.A. All rights reserved.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER VERLAG  

Parallel finite element method for the analysis of quasi-three dimensional shallow water flow is presented. The mode splitting technique and the sigma coordinate (generalized coordinate) are employed to use parallel computers effectively. Parallel implementation of the unstructured grid-based formulation is carried out on the Hitachi parallel-super computer SR2201. The tidal flow of Tokyo Bay is simulated for a numerical example. The speed-up ratio and the efficiency of the parallelization are investigated. The present method is shown to be a useful and powerful tool for the large scale computation of shallow water flows.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TECHNO-PRESS  

This paper presents a finite element method based on the homogenization theory for the visco-elastic analysis of asphalt concrete considering the mechanical behaviors of microstructures. The configuration of microstructure is modeled using the X-ray CT in order to grasp the behavior of visco-elasticity which takes into account the nonlinearity and the properties of each material of the asphalt concrete. The efficiency of this approach is examined by the comparison with experimental results.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TECHNO-PRESS  

A stabilized finite element method based on the Q(1)-P-0 element is presented for the analyses of high Reynolds number flows, The SUPG formulation and the pressure stabilization matrix are applied for the discretization. The present method is shown to be a an efficient and useful tool for the analyses of incompressible high Reynolds number flows.

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TECHNO-PRESS  

Asphalt concrete is a composite constraction material, which consists of the aggregate and asphalt. The dynamic properties of the asphalt concrete is modeled by the visco-elastic theory. In this paper, the homogenization method, which is a mathematical theory to obtain avarage material constants of a composite material with periodic microscopic structures, is applied to the visco-elastic analysis of the asphalt concrete. The efficiency of this approach is examined by the comparison with experimental results.

Web of Science

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：TECHNO-PRESS  

This paper presents a parallel finite element method for incompressible Navier-Stokes flow based on unstructured grid. The stabilized finite element method based on SUPG/PSM is used. For solving the pressure equation, which consume the most of computational time, the Element-by-Element SCG method is employed. A parallel finite element solver is successfully implemented on a massively parallel computer.

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Techno press  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Techno Press  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：COMPUTATIONAL MECHANICS PUBLICATIONS LTD  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JOHN WILEY & SONS LTD  

Massively parallel finite element strategies for large-scale computations of shallow water flows and contaminant transport are presented. The finite element discretizations, carried out on unstructured grids, are based on a three-step explicit formulation both for the shallow water equations and for the advection-diffusion equation governing the contaminant transport. Parallel implementations of these unstructured-grid-based formulations are carried out on the Army High Performance Computing Research Center Connection Machine CM-5. It is demonstrated with numerical examples that the strategies presented are applicable to large-scale computations of various shallow water flow problems.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：University of Padova  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：日本造船学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE SA LAUSANNE  

This paper presents an adaptive boundary-type finite element method for wave diffraction-refraction in harbors. The present method consists of three parts; the automatic mesh generation method, the boundary type finite element method and the adaptive remeshing method. The present model is based on the mild-slope equation and an arbitrary reflection condition is introduced. The computed results are compared with the existing analytical and experimental results. This method is shown to be a useful and powerful tool for the analysis of wave diffraction-refraction in harbors.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：KLUWER ACADEMIC PUBL  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：日本数値流体力学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：日本風工学会  

This paper presents a finite element method for the analysis of orographic rainfall. For the governing equations, the Navier-Stokes equation is used for the wind analysis, and the Kessler model is used for the rainfall analysis. The three step Taylor-Galerkin finite element method based on the linear triangular element is employed for the discretization. This method is shown to be an effective method for the analysis of orographic rainfall. © 1993.

DOI： 10.1016/0167-6105(93)90343-M

Scopus

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Gordon and Breach  

This paper investigates the numerical accuracy of a simplified finite element model using a natural boundary condition for wave difTraction-refraction problems. The key feature of this model is that a radiation condition is imposed at the open boundary of the analytical region. The mild-slope equation is used for the basic equation. The computed results are compared with existing theoretical results and the results obtained by another accurate numerical method. The relationship between the numerical accuracy and the position of the open boundary is shown. © 1993 Gordon and Breach Science Publishers, S.A.

DOI： 10.1080/10618569308904477

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INT CENTER NUMERICAL METHODS ENGINEERING  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Gordon and Breach  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INT CENTER NUMERICAL METHODS ENGINEERING  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：INT CENTER NUMERICAL METHODS ENGINEERING  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier  

This paper presents a finite element method for the analysis of orographic rainfall. For the governing equations, the Navier-Stokes equation is used for the wind analysis, and the Kessler model is used for the rainfall analysis. The three step Taylor-Galerkin finite element method based on the linear triangular element is employed for the discretization. This method is shown to be an effective method for the analysis of orographic rainfall. © 1993.

DOI： 10.1016/0167-6105(93)90343-M

Scopus

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JOHN WILEY & SONS LTD  

This paper presents a new automatic mesh generation method for the finite element analysis of shallow water flow. The key feature of this method is that the finite element mesh can be generated so that the element Courant number is nearly constant in the whole domain. It follows that the numerical stability and accuracy improve automatically. Moreover, the finite element mesh data, including the data of water depth, can be prepared automatically. The three-node triangular element is used for the finite element. In order to show the efficiency of the method presented. the mesh obtained by this method is applied to some shallow water flow analyses. This method is shown to be a useful and powerful tool for the preparation of optimal finite element mesh data for shallow water flow analysis.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

DOI： 10.11532/journalac1992.1.57

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：日本風工学会  

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Language：English   Publisher：中央大学  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

A finite element method is applied to solve the two-dimensional turbulent channel flows. Based on the fractional step techniques, the momentum and the k-epsilon equations are split into convection and diffusion equations. The convection equations are solved by the second-order Taylor-Galerkin finite element method, which can overcome the spurious oscillations with minimal artificial diffusion, and the diffusion equations are solved by the fully explicit Galerkin method. Since the same order interpolation is used for the velocity, pressure and turbulent quantities, the present method is computationally efficient. The sudden expansion flow and the obstructed turbulent channel flow are studied. The results are in good agreement with experimental observations.

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Language：English   Publishing type：Research paper (scientific journal)  

Abstract: A knowledge‐based expert system for the prediction of natural disaster potential is presented in this paper. The key feature of this system is that it predicts the natural disaster potential using the information of geomorphological and geological features of the examined site. The input data are obtained from topographic maps, geological maps, aerial photographs and other sources available. This system is developed for use with the personal computer and users can operate this system interactively. The results obtained are compared with actual disasters. These comparative studies indicate that the present system provides a useful tool for the prediction of natural disaster potential at the arbitrary sites. Copyright © 1992, Wiley Blackwell. All rights reserved

DOI： 10.1111/j.1467-8667.1992.tb00438.x

Scopus

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer-Verlag  

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Language：Japanese   Publisher：計算力学シンポ実行委員会  

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Language：Japanese   Publisher：土木学会  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：University of Sydney  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

This paper presents hydrosperic disaster estimation by means of expert system. This system make a diagnosis of the type and potential of disaster using the information of topographical and geological features. The present system can be performed by the personal computer. A knowledge representation method is based on production rules. The certainty factors associated with them. The example of the actual disasters is analyzed by this system.

DOI： 10.2208/prohe.34.613

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：文部省重点領域研究数値流体力学実施グループ  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Univ. Alabama Press  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Okayama University of Science  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JOHN WILEY & SONS LTD  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：JOHN WILEY & SONS LTD  

Web of Science

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

This paper presents a finite element method for the analysis of linear water wave problems using the mesh optimization technique. The numerical model is based on the mild-slope equation. The hybrid element method is employed for the numerical treatment of the open boundary. The key feature of this method is that the approximation error based on the finite element discretization is estimated and the finite element mesh is redivided to minimize the total amount of the error. This follows that the accuracy of the numerical solutions is improved automatically. The numerical solutions obtained are compared with analytical solutions. The present method is shown to be an useful and effective method for the analysis of linear water wave problems.

DOI： 10.2208/jscej.1987.387_115

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：North-Holland  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：INRIA  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer-Verlag  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Pineridge Press  

DOI： 10.1108/eb023624

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

A new finite element method for the analysis of surface wave problems is presented in this paper. The characteristic of this method is that the interpolation equation is selected to satisfy the Helmholtz equation in each element. This follows that the variational functional to be minimized can be formulated as in the form that all integrations are limited just on the boundary of the element. The numerical solutions obtained are compared with the analytical and observed results. From these comparative studies, it is concluded that the present method provides a useful and valuable tool for the analysis of surface wave problems.

DOI： 10.2208/jscej.1985.363_205

CiNii Books

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Total pages：359   Responsible for pages：1-16,189-240,253-264   Language：Japanese   Book type：Scholarly book

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Responsible for pages：602-608   Language：Japanese   Book type：Scholarly book

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：社）日本計算工学会  

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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：社）日本計算工学会  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：社）日本計算工学会  

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：公益財団法人日本学術協力財団  

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：社）日本計算工学会  

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Language：Japanese  

J-GLOBAL

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：日本シミュレーション学会  

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DOI： 10.11345/japannctam.61.0.171.0

J-GLOBAL

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J-GLOBAL

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Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：財団法人日本建設情報総合センター  

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J-GLOBAL

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Language：English   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：National Center for High Performance Computing,Taiwan.  

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