Research on simulation of fluid-structure interaction problem by dynamic explicit method

Research Project

Project/Area Number	11650948
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	船舶工学
Research Institution	KYUSHU UNIVERSITY
Principal Investigator	YASUZAWA Yukitaka Faculty of Engineering, KYUSHU UNIVERSITY Ass.Prof., 大学院・工学研究院, 助教授 (10191123)
Co-Investigator(Kenkyū-buntansha)	TOYOTA Kazutaka Faculty of Engineering, KYUSHU UNIVERSITY R.Ass., 大学院・工学研究院, 助手 (10274507) MAEDA Masahiro Faculty of Engineering, KYUSHU UNIVERSITY R.Ass., 大学院・工学研究院, 助手 (70173713) KAGAWA Koji Faculty of Engineering, KYUSHU UNIVERSITY Prof., 大学院・工学研究院, 教授 (00253500)
Project Period (FY)	1999 – 2000
Project Status	Completed (Fiscal Year 2000)
Budget Amount *help	¥3,100,000 (Direct Cost: ¥3,100,000) Fiscal Year 2000: ¥1,500,000 (Direct Cost: ¥1,500,000) Fiscal Year 1999: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywords	Hydroelasticity / Parallel computing / Dynamic explicit method / Condugate gradient method / FEM / クラスタシステム / 流体・構造連成問題 / パラレルコンピュータ / 衝突問題
Research Abstract	Numerical simulation using dynamic explicit method applied based on principle of virtual work rate has been investigated in the present research. Firstly large deformation problem of framed structure with rapid displacement has been performed. The explicit mathod takes advantage that no iteration at each time step is needed and that large memory space is not necessary because of independence of physical variables between nodes. On the other hand, time step for calculation has to be very small. In the present research, a new control methods of time increment has been proposed. And the effectiveness of the control has been shown. This methods is also applied to large deformation problem of plate structure by use of shell finite elements and proved to be effective. Pararell computing is studied and cluster system for pararell computing has been established and structural analysis with large DOF problem is demonstrated. The mehods which estimate CPU time and memory space in calculation have been built. Condugate gradient algorithm applied to divided region method is effective to large structural problem because of the rapid convergence. Finally formulation for hydroelastic problem of flexible floating structure is performed by using of the condugate gradient method.