Development of Class Library for Fluid-Structure Interaction

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Fluid-structure interaction problems are still unknown phenomena and it is highly expected to study them by numerical simulations. In this study, the class library of C++ programming language was developed to analyze fluid-structure interaction problems. The library consists of fluid-simulation class with sophisticated numerical method, structure-analysis class, fluid-structure coupling class, grid generation class, parallel computing class, and visualization class. By combining these classes depending on the problems, numerical simulation codes are easily constructed.In the fluid-simulation class, high-accurate numerical method was developed and the stable coupling method on the collocated grid was proposed in which easily introduces fluid-structure interaction. This method is also easily applicable to parallel computing and the explosion simulation was executed by 2000 CPU of a PC-Cluster system. In the AMR sub-class, it is possible to refine the mesh of the tree-data structure with third-order spatial accuracy. It is found that the overset grid sub-class is quit effective for rigid body of transform and rotational motion in fluid. The torque of the wind turbine was studied with using this sub-class. We developed the sub-class of Immersed boundary method which makes it possible to treat complex shapes on Cartesian grid. The sub-class of Distinct Element Method was used to study destruction of the structure with mass-spring model. The sub-class of photo-realistic rendering could visualize the bubbly flow and meso-scale typhoon simulation and made high-quality animations by using POV-Ray software. These ware highly evaluated.