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Development of parallel computational system for 3-D wind flow; around ground with structures using CAD/GIS data

3D风流并行计算系统的开发；

基本信息

批准号：
12650482
负责人：
KASHIYAMA Kazuo
金额：
$ 1.73万
依托单位：
CHUO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650482/
关键词：
CAD GIS wind flow stabilized finite element methc parallel computing

项目摘要

A finite element modeling system for ground considering structures and a parallel finite element system for 3-dimentional wind flow have been developed in this study.In the finite element modeling system, the CAD and GIS data were combined using common data format (DXF) and it was used for mesh generation for ground and structure. In order to express the geographical features accurately, a side of triangular element expressed not only the contour lines but also the valley and mountain lines. The Delaunay triangulation method was applied for making an unstructured mesh and the multi-boxcel method was applied for making a structured mesh. By using the present system, an accurate finite element mesh considering the complicated configuration of ground and structures.In the parallel finite element system for wind flow, the unsteady Navier-Stokes equation based on Boussinesq approximation was used for the governing equation of wind flow and the SUPG and PSPG.(pressure-stabilizing/Petrov-Galerkin) methods were used stabilization method. The P1/P1 element was employed for the discretization in space. Parallel implementation based on domain decomposition method and MPI was carried out on a distributed memory parallel cluster. The computed results were compared with the experimental results. From the results, the numerical result obtained by the present method is good in agreement with the experimental results. Furthermore, the good parallel performance was obtained from the results of parallel performance.

本研究开发了考虑结构的地面有限元建模系统和三维风流的并行有限元系统。在有限元建模系统中，使用通用数据格式（DXF）将CAD和GIS数据结合起来，用于地面和结构的网格生成。为了准确地表达地理特征，三角形元素的一条边不仅表达了等高线，还表达了山谷和山脉的线条。 Delaunay 三角剖分方法用于制作非结构化网格，而multi-boxcel 方法用于制作结构化网格。利用本系统，考虑到地面和结构的复杂构型，建立了精确的有限元网格。在风流并行有限元系统中，风流控制方程采用基于Boussinesq近似的非定常Navier-Stokes方程，并采用SUPG和PSPG。稳定方法采用(压力稳定/Petrov-Galerkin)方法。采用P1/P1单元进行空间离散化。在分布式内存并行集群上进行了基于域分解方法和MPI的并行实现。将计算结果与实验结果进行了比较。从结果来看，本文方法得到的数值结果与实验结果吻合较好。此外，从并行性能的结果来看，得到了良好的并行性能。