Abstract：An improved unstructured finite volume time domain method is presented to solve the acoustic-elastic interaction problems. The computational domain is divided into acoustic and elastic sub-domains and the interaction between them is implemented by interface boundary conditions. The quadrilateral element, which is treated as the bilinear element while considering the linear term and the constant term, and the triangular element are employed to deal with mixed grid problems. The stability criterions are provided for the quadrilateral element and the triangular element respectively for the acoustic wave equation. Different time steps are adopted for different sub-domains which could improve the efficiency of the present method. One elastic wave problem and two acoustic-elastic interaction problems are solved. According to the comparisons between the calculated results and the published results, the improved method can treat the acoustic-elastic interaction problem effectively and accurately with good numerical stability.
2013, Vol. 34 
