Large-scale parallel computing of finite element analyses for reactor building incorporating soil-structure interaction

摘要: This paper presents the large-scale parallel computing performance of finite element (FE) analysis for a reactor building incorporating soil-structure interaction by using the open-source FE program, FrontISTR. A FE model whose scale is similar to that employed in existing practices is used to confirm the accuracy as the original model. A large-scale model is created by refining the original model as the refined model to investigate the parallel efficiency of the FE solver. The concept of the domain decomposition method is incorporated to perform highly efficient parallel computation of the conjugate gradient solver with block diagonal scaling.Numerical analyses are executed with different numbers of processors that correspond to those of the decomposed domains. Based on the analysis results, the efficiency of parallelization to soil-structure interaction problems is examined. For evaluating the scalability of the program and data, the normalized speed-up factor (NSF) is defined. Using the NSF, a reasonable number of parallel processes is proposed. If the parallelization ratio and NSF are given, a reasonable number of parallel processes can be obtained. In case that the NSF is 50%, reasonable numbers of processes are respectively estimated as 322 for the original model and 2247 for the refined model.