Spurious Modes in Finite Element Models for Ultrasonic Waves in Fluid-Solid Systems

摘要

Competing finite element methods exist for modeling fluid-solid interaction such as velocity Potential and displacement, (ϕf,u⃗ s) pressure and displacement, (pf,u⃗ s) , and displacement and displacement or displacement-only, (u⃗ f,u⃗ s) 1. Displacement-only finite element models for fluid-solid interaction are attractive because a model for a compressible, inviscid fluid is obtained from a model of a linear, homogeneous and isotropic (LHI) elastic solid by simply setting the elastic shear modulus, G 8, equal to zero; therefore, existing elastodynamic codes can be utilized for modeling fluids.