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Massively Parallel Mesh-less Analysis System for Fluid-Structure Compied Phenomena in Nuclear Power Plants

核电厂流固现象大规模并行无网格分析系统

基本信息

批准号：
11480121
负责人：
YAGAWA Genki
金额：
$ 8.9万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11480121/
关键词：
Free Mesh Method Coupled Analysis Large Scale Analysis Parallel Processing PC Cluster Paralle Computer Nuclear Power Plant エンジニアリング・シミュレーション流体・構造連成解析超並列計算メッシュレス解析

项目摘要

The requirements for analyzing various kind of phenomena in nuclear power plants are the capability to analyze the complex phenomena in nuclear reactor, the efficiency and speed of pre-processing for analyzing them accurately, to make the main analysis process seemless and using massively parallel computers for reducing time and storage costs.In this study, therefore, we developed the following key technologies ; (1) introducing a new analysis strategy, which does not need finite element meshes and are suitable for massively parallel environment, (2) using such a meshless method, developing the massively parallel large scale 3-dimensional analysis codes, which includes free surface and oscillate solid, (3) finally, developing the non-linear and dynamic stress analysis system for the massively parallel large scale 3-dimensional structures considering the effect of thermal-fluid coupled analysis.In this study, we used Free Mesh Method (FMM) as a basic technology, which was a kind of meshless methods. Using this method, we developed fluid-structure coupled analysis system. Concretely, (1) developing the domain decomposition module for analyzing in parallel from nodal based data, (2) developing parallel iterative linear solver with the preconditioning for structure and fluid analysis, (3) developing prototype system for evaluate the system, (4) verifying the efficiency of developed system on the PC clusters, (5) verifying the efficiency of developed system on Hitachi SR2201 and SR8000, (6) integrating the developed system with user interface functions.Because of the high applicability of Free Mesh Method to the parallel processing, we could develop the 3-dimensional large, scale coupled analysis system, which showed high parallel efficiency on both PC clusters, and parallel computers.

分析核电站各种现象的要求是能够分析核反应堆中的复杂现象，准确分析这些现象的预处理的效率和速度，使主要分析过程变得简单，并使用大规模并行计算机来减少时间和存储成本。因此，在本研究中，我们开发了以下关键技术； (1)引入一种不需要有限元网格且适合大规模并行环境的新分析策略，(2)利用这种无网格方法，开发了大规模并行大型3维分析代码，包括自由表面和振荡固体，(3)最后，开发了考虑热流耦合效应的大规模并行大型3维结构的非线性和动态应力分析系统本研究采用自由网格法（FMM）作为基础技术，它是无网格方法的一种。利用这种方法，我们开发了流固耦合分析系统。具体来说，(1) 开发用于从基于节点的数据进行并行分析的域分解模块，(2) 开发具有结构和流体分析预处理的并行迭代线性求解器，(3) 开发用于评估系统的原型系统，(4) 在 PC 集群上验证开发系统的效率，(5) 在 Hitachi SR2201 和 SR8000 上验证开发系统的效率， (6)将开发的系统与用户界面功能集成。由于自由网格法对并行处理的高度适用性，我们可以开发3维大型、尺度耦合分析系统，该系统在PC集群和并行计算机上都表现出很高的并行效率。