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This paper presents a convolution quadrature time-domain boundary element method for fluid-elastic half space. Application of convolution quadrature method (CQM) to time-domain boundary element method (BEM), which is called CQ-BEM, can help improve numerical stability of time-stepping procedure. However, the conventional CQ-BEM for fluid-elastic half space has two disadvantages. First, it requires much memory to evaluate retarded potentials of timestepping procedures. Second, it is difficult to couple both boundary integral equations for fluid and elastic half space with time-domain boundary conditions on fluid-elastic interface directly. The formulation presented herewith improves these disadvantages by transforming boundary values in time-domain into Fourier-domain. As numerical examples, air-coupled ultrasonic simulation is shown to validate the presented method.

doboku gakkai rombunshuu. a2, ouyou rikigaku

Development of Convolution Quadrature Time-Domain Boundary Element Method for Fluid-Elastic Half Space and Its Application to Air-Coupled Ultrasonic Simulation