机械设备流固耦合动力分析的有效方法

EFFECTIVE METHOD FOR DYNAMIC ANALYSIS OF INTERACTION OF FLUID AND STRUCTURE OF MECHANICAL EQUIPMENT

提出流固耦合动力分析的新方法。该法通过结构动力学的有限元求解方程和 Newmark法 ,导出了新的迭代公式。流场的动压力使弹性体的动态特性变为载荷非线性问题 ;同时 ,固体位移场的变形作用使流场成为可变域流场。这些问题都可用本法得以解决。文中给出算例和工程应用实例。数值解结果表明 ,该法收敛速度快 ,效率高 。

The dynamic behavior analysis of an elastic structure interacting with a fluid may be considered for mechanical equipment. A new method is proposed in this paper for dynamic analysis of interaction of fluid and structure. This method describes a new iteration equation which is derived according to the finite element equations of a dynamic problem and Newmark method. The dynamic behavior of this structure, which is a load nonlinear problem under the pressure of the fluid, is solved through this method. The flow field with variable fluid domain under the dynamic respond of this structure is solved as well. Two numerical examples are presented in this paper finally. The solution results illustrate the effectiveness of this method and the difficulty of solving interaction of fluid and structure has been overcome successfully.