Interfacing Finite Element and Boundary Element Discretizations

Abstract

A review is provided of various methods for coupling a mechanical finite element model to an infinite external acoustic domain. The associated physical problem involves a three-dimensional structure, submerged in an acoustic fluid, and a pressure shock impinging on the structure. Of primary concern is the structural response and, in particular, the structure's survivability. The governing matrix equation of motion for the dynamic response of a discrete structure is considered along with the fluid equations of the interaction equations. Three approaches for solving the obtained coupled finite element/boundary element system are reported, giving attention to the 'field elimination' method, the procedure of simultaneous integration, and a partitioned integration process.

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