入水问题的Euler-Lagrange流固耦合数值模拟技术研究

An Euler-lagrange coupling method for numerical simulation of water entry

针对结构入水过程的特点,建立了一种把Eulerian计算过程和Lagrangian计算过程耦合起来的数值技术,编写了计算程序,把结构对水作用的过程和结构动力学响应过程的计算结合起来,实现了结构与水之间流固耦合作用过程的模拟.其中水、空气的运动利用Eulerian过程的流体弹塑性有限差分计算程序进行模拟,结构的运动变形利用Lagrangian过程的结构动力学有限元计算程序模拟结构响应.通过板入水问题的计算结果与商业软件计算结果进行比较,验证了计算方法对流固间相互作用处理的正确性.本文计算程序可用于一般入水问题的结构响应-流场运动分析中.

To describe the interaction between the structures and water during water-entry,an Euler-Lagrange coupling code was developed.The Eulerian finite different code was used to simulate the behave of fluid field which including the water and air.And the dynamic finite element code was used to calculate the response of structures.The problem of water entry of flat plate was caculated by the code,the numerical results were agreement with the analytical results and results from LS-DYNA3 D.The code made in this paper can be used for the numerical simulation of water-entry.