Modeling Bulk and Guided Waves in Unbounded Elastic Media Using Absorbing Layers in Commercial Finite Element Packages

Abstract

This paper presents solutions to achieve higher computational efficiency for the modeling of bulk and guided waves in unbounded elastic media using absorbing layers in commercially available FE packages. The aim is to provide an assessment to aid practical modeling of large wave propagation problems. The concept and implementation of perfectly matched layers and absorbing layers using increasing damping are explained. Analytical models enabling easy calculation of appropriate layer parameters for models are presented and validated. Demonstrator cases are used to prove that both techniques achieve a significant improvement in computational efficiency over classical techniques.