### ASA 127th Meeting M.I.T. 1994 June 6-10

## 3aSAb5. Time domain visualizations of simulated acoustic propagation and
scattering processes in complex structures using a cellular automaton algorithm
run on a parallel processor.

**James B. Cole
**

**
Rudolph A. Krutar
**

**
Susan K. Numrich
**

**
**
*Naval Res. Lab., Washington, DC 20375-5337
*

*
*
A cellular automaton realization of a finite difference time domain
algorithm that can exploit the full power of parallel processors to simulate
acoustic wave fields as they evolve in time, forming animated visualizations of
wave propagation and scattering processes has been developed. Since the
computation time is independent of environmental complexities (e.g., boundary
shape, medium inhomogeneities), it is possible to simulate and visualize
acoustic propagation in complex structures. Moreover the algorithm does not
employ the far-field approximation so it is particularly useful to study
time-dependent near-field and intermediate-field processes. Two-dimensional
views of a four-dimensional space-time lattice of acoustic field values are
selected.