日時: 2019年7月1日（月）、15:05 - 16:00
場所: R-CCS 6階講堂
・講演題目： Development of a Unified Continuum Mechanics Simulation Framework for Industrial Applications
・講演者： 坪倉 誠（複雑現象統一的解法研究チーム、チームリーダー）
A High-Performance Computing(HPC) framework for the fluid-structure interaction problems with complicated geometry have been developed, considering its application to industrial matters. To overcome the difficulty of mesh generation and treatment of moving boundary, hierarchically structured finite volume method was adopted as its data structure in which both the fluid motion and structure deformation are solved in unified Eulerian manner. To achieve higher computational efficiency of parallelization and scaling on the massively parallel environment, Building Cube Method (BCM) proposed by Nakahashi was adopted. In the method, numerical domain is first decomposed into cubic sub-domains based on the octree method. Then the same number of numerical grids is allocated to each cubic subdomain. The solid surface with complicated geometry is represented by the immersed boundary method (IBM). In the fluid-structure interaction problems with structure surface in motion, accurate representation of the immersed body is indispensable. Thus Lagrangian description for tracking the moving solid body surface is adopted in the Eulerian framework of solving fluid and structure motions. So far, the framework can handle maximum of tens of billions of numerical meshes using hundreds of thousands of CPU cores on the K-computer. Applications of the method to vehicle aerodynamics, aero-acoustics, combustion systems, and structure analysis are introduced.
Keywords: unified simulation, HPC, immersed boundary, hierarchically structured grid, industrial application