Shinsuke Nagaoka

APPLICATION OF THE EFMM TO FLUID-STRUCTURE COUPLED ANALYSIS AND ITS PARALLELIZATION METHOD

Abstract. There is a new fluid-structure coupled analysis method that combines a structure analysis method using Enriched Free Mesh Method (EFMM); a type of meshless analysis methods and a fluid analysis method using SUPG/PSPG stabilized FEM. in this study, solutions for problems during the parallelization of the abovementioned method are described. In EFMM, it is relatively easy to parallelize problems which do not require remeshing such as static analyses. Application of EFMM, on the other hand, becomes challenging on the problems needs remeshing due to issues in analysis algorithm of EFMM. Nevertheless, parallelization is essential in the fluid-structure coupled analysis. There fore, we propose a method for parallelization of EFMM in this study.

Fluid-Structure Coupled Analysis Using Enriched Free Mesh Method

Almost all the phenomena occurring around us are the coupled phenomena. In the field of numerical analysis, it is difficult to perform coupled analysis. Because, there are a lot of problems and these problems make coupled analysis difficult, so we have to resolve these problems to perform analyses with considering the coupling effect. At present, as the popularity of numerical analysis rising along advancement in computer performance, demand of numerical analyses with incorporating coupling effects will further increase. In this research, we propose a new fluid-structure coupled analysis method using SUPG/PSPG stabilized FEM and Enriched Free Mesh Method to eliminate a lot of problems occurring in the process of coupled analysis. As the feature of our proposed method, linear triangular elements are only used in the analysis.

Free Mesh Method with a New Boundary Treatment

In recent years, the object for numerical analysis becomes complicated and meshing is more and more difficult. The Free Mesh Method, which is one of the mesh-less method is, considered to make large-scale analysis easier without the so-called meshing process. However, mesh generation still needs much computation time. In order to reduce the computation time for meshing, we develop a new method using semi-circle with searching circle of nodes when employing the Free Mesh Method.

3D Animation for Free Mesh Method

In recent years, the performance of computer has been improved dramatically. Numerical or computation technology is also developing greatly with the above improvement in the performance of computer. On the other hand, the objects for the analysis become more and more complicated. To deal with the large-scale and complex problems, new approach called the meshless method has been actively studied. The Free Mesh Method is one of the meshless methods, which can solve the complicated phenomenon that the body is dynamically fragmented. In order to animate such an analysis result, this paper describes the 3D animation system for the free mesh method, which is intended to be a post-processor for dynamic phenomena.