基于虚拟介质方法数值模拟应力波穿透水舱

将虚拟介质方法推广到应力波与流固界面的相互作用,基于修正虚拟流体方法(MGFM)思想提出一种适用于流固界面应力波折射问题的界面状态计算法则.以此为基础,用Zwas格式和WENO格式分别离散固体和流体控制方程,数值模拟应力波穿透水舱.数值测试表明:虚拟介质方法推广到模拟流固界面上的应力波时,数值误差具有很好的收敛性;该研...

Numerical simulation of stress wave penetrating a water tank using the ghost material method

The ghost material method was extended to the interaction between stress wave and fluid-solid interface.An interfacial calculation algorithm based on modified ghost fluid method(MGFM)was proposed for stress wave refraction on fluid-solid interface.On this basis,we used the Zwas scheme and the WENO scheme,respectively,to discretize solid and fluid governing equations to numerically simulate stress wave penetrating water tanks.Numerical test shows that the ghost material method was convergent when applied for stress wave impacting at fluid-solid interface.The presented calculation algorithm has first order numerical accuracy.1D numerical results coincide well with the exact solutions.This verifies the feasibility of the extension of the Ghost Material Method to stress wave reflection and transmission on fluid-solid interface.Numerical results of stress wave penetrating the water tank show that(i)the results by the ghost material method are closed to those by the arbitrary-Lagrangian-Eulerian(ALE)method,(ii)the intensity of the transmitted wave increases to some extent after increasing the pressure of water tank,(iii)stress wave refractions in the vicinity of fluid-solid interface are very closed under different pressures.The conclusions are practically significant to ship defense and design.