摘要
在开源软件Tahoe框架基础上,结合有限元前后处理程序MSC.Patran及Tecplot,对某复杂夹具进行建模.通过区域分解、编制接口和采用PHG中提供的PCG(preconditioned conjugate gradient,预处理共轭梯度法)迭代解法成功实现262×104自由度模型的串、并行计算.结果表明,并行计算收敛速度更快,4进程并行计算时间不到串行计算时间的1/4.通过与商用程序MSC.Nastran比较,验证计算结果的正确性.利用大型并行计算机对该模型并行计算性能进行研究,获得最高32进程的并行计算加速比.研究表明,改进后的Tahoe计算框架对于开展大规模自由度下的结构并行计算分析研究是可行的,并且随计算节点增加,并行计算过程基本呈线性加速.
In Tahoe frame （an open source software）and finite element （FE） pre-processing/post-processing soft wares （MSC. Patran and Tecplote）, an FE model of clamp structure was created. Serial and parallel computations of a model with 2.62 minion-freedom degree are achieved successfully with domain decomposition, compiling of interfaces and iterative algorithm solvers provided in PHG solvers （preconditioned conjugate gradient methods）. It indicates that convergence of parallel computation is faster than serial one＇s, and computation time of a four-procedure parallel is less than one forth of that of serial one. Accuracy of computing is validated by comparing with result of MSC. Nastran. Parallel computing performance of the frame is tested with a large parallel computer. The maximum testing number is 32 nodes. It shows that an updated Tahoe frame is feasible in parallel computing of large-scale freedom degree models. Parallel computing time is nearly linearly reduced with increasing of computing nodes.
出处
《计算物理》
EI
CSCD
北大核心
2009年第5期699-702,共4页
Chinese Journal of Computational Physics
基金
中国工程物理研究院十一五重大预研专项课题资助项目
关键词
并行计算
有限元
区域分解
预处理共轭梯度法
加速比
parallel computing
finite element
domain decomposition
preconditioned conjugate gradient
speedup
