ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

4pUW1. Benchmark cases for range-dependent seismoacoustic propagation codes.

Joo Thiam Goh

Henrik Schmidt

Dept. of Ocean Eng., MIT, 77 Massachusetts Ave., Cambridge, MA 02139

Benchmark solutions exist for range-dependent acoustic propagation in fluid-only media [J. Acoust. Soc. Am. 87, 1497--1545 (1990)]. However, not many reference solutions are available for the case of mixed fluid-elastic media. Some simple canonical benchmark problems are presented and the solutions from four different computational methods are compared. They are the elastic PE [J. Acoust. Soc. Am. 93, 1815--1825 (1993)], boundary element method [J. Acoust. Soc. Am. 89, 1629--1642 (1991)], wave-number integration approach [J. Acoust. Soc. Am. 97(A), 3316 (1995)], and a spectral superelement formulation [J. Acoust. Soc. Am. 98, 465--472 (1995)]. Both forward and backscattered results are presented. A common thread in the last three approaches is the use of the SAFARI/OASES code as a Green's function generator. Conclusions regarding the general performances of these methods are drawn for the various test cases. [Work supported by ONR.]