Richard S. Keiffer
NRL-SSC, Code 7181, Stennis Space Center, MS 39529-5004
J. C. Novarini
PSI, Long Beach, MS 39560
Previously, a model for the impulse response of rough two-dimensional
(2-D) surfaces, based on an extension of the wedge assemblage method, has been
described (R. S. Keiffer et al., Proceedings of the Second IMACS Symposium on
Computational Acoustics, Vol. 1, p. 67), In the time that has elapsed since
this fully 3-D scattering model's original development, the validity of the WA
model, which was questionable for smooth, unwedge-like surfaces has clearly
been established for 2-D surfaces [R. S. Keiffer, J. Acoust. Soc. Am. (to be
published)]. More recently, the extension of the WA method that allows for the
application of the technique to fully 2-D surfaces has been rigorously tested
in a numerical study involving scattering from thin disks (R. S. Keiffer et
al., submitted to J. Acoust. Soc. Am.). With the validity of the WA method less
in question, and with the increasing availability of benchmark quality
solutions (albeit in the frequency domain) for the fully 3-D problem, it seems
appropriate at this time to review the 3-D wedge assemblage scattering program
(WASP 3D) and to begin a benchmarking exercise. [This work has been supported
by ONR.]