Abstract
As an intermediate step toward developing a two‐dimensional finite difference model of outdoor sound pulse propagation containing both cumulative finite amplitude effects and the local effect of a finite impedance ground, a program addressing the nonlinear steepening has been implemented. Previous studies [J. Acoust. Soc. Am. Suppl. 1 80, S104 (1986) and J. Acoust. Soc. Am. Suppl. 1 82, S64 (1987)] have involved linear propagation only. The vectorized code has been running on a CRAY X‐MP at the National Center for Supercomputer Applications in Champaign, IL because of its intensive CPU and memory requirements. Details of the time stepping algorithm, as well as those of the numerical boundary conditions, will be given. The results of this program will be compared with that of SHOCK.F, a one‐dimensional acoustic propagation code including finite amplitude effects [J. Acoust. Soc. Am. 74, 1514–1517 (1983)]. As an example of some typical color graphics output, a short videotape will conclude the presentation.
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