ALE Simulation of Rayleigh-Taylor Instability

摘要

This paper investigates the use of an Arbitrary Lagrangian– Eulerian(ALE)technique for the simulation of a single mode Rayleigh–Taylor instability.A compatible Lagrangian algorithm is used on a simply connected quadrilateral grid in Lagrangian Phase.This algorithm includes subzonal pressures,which are used to control spurious grid motion,and an edge centered artificial viscosity.We use Reference Jacobians optimization based rezone algorithm in the rezoning phase of ALE method. Also a second order sign preserving method is used for remapping.To force monotonocity in remapping phase a Repair algorithm is used.Finally,for remapping of nodal variables we used a second order transformer to transfer these data to cell centers.It is shown that the usage of these algorithms for an ALE method can improve the simulation of a single mode Rayleigh–Taylor Instability.