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

动显式方法模拟流固耦合问题的研究

• 批准号: 11650948
• 负责人: YASUZAWA Yukitaka
• 金额: $ 1.98万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650948/
• 关键词: 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

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.

本文研究了基于虚功速率原理的动态显式方法的数值模拟。首先对框架结构快速位移大变形问题进行了研究。显式方法利用了每个时间步不需要迭代的优点，并且由于节点之间的物理变量的独立性，不需要大量的内存空间。另一方面，计算的时间步长必须非常小。在本研究中，提出了一种新的时间增量控制方法。控制的有效性已得到证明。并将该方法应用于板结构的大变形问题，证明了该方法的有效性。对并行计算进行了研究，建立了并行计算集群系统，并对大自由度问题进行了结构分析。建立了计算中估计CPU时间和内存空间的方法。将导通梯度算法应用于分域法，由于收敛速度快，对求解大型结构问题是有效的。最后，利用管道梯度法对柔性浮体结构的水弹性问题进行了推导。

项目成果

安澤 幸隆: "動的陽解法を用いた有限要素解析に関する考察"西部造船会弟99回例会論文梗概. 143-148 (1999)

Yukitaka Yasuzawa：“使用动态显式方法进行有限元分析的考虑”西方造船学会第 99 届例会论文摘要 143-148（1999 年）。

Y.Yasuzawa, S.Sugimoto, K.Kagawa: "Fundamental study of finite element analysis with dynamic explicit method"Trans. of the West-Japan society of naval architects. Vol. 99. 235-236 (2000)

Y.Yasuzawa、S.Sugimoto、K.Kakawa：《动态显式法有限元分析的基础研究》译。

Y.Yasuzawa, S.Sugimoto: "Fundamental study of explicit finite element analysis of framed structures"Proc. of the 13th Asian technological exchange and advisory meeting. 23-30 (1999)

Y.Yasuzawa，S.Sugimoto：“框架结构显式有限元分析的基础研究”Proc。