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

## 4pPA1. A new lattice gas model for 1-D sound propagation with dissipation.

**Yasushi Sudo
**

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Victor W. Sparrow
**

**
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*Graduate Prog. in Acoust., Penn State Univ., 157 Hammond Bldg., University
Park, PA 16802
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*
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The authors have proposed new lattice gas models for sound propagation
[``A New Lattice Gas Model for 1-D Sound Propagation,'' J. Comp. Acs. (to be
published); ``Sound Propagation Simulations Using Lattice Gas Methods,'' 15th
AIAA Aeroacoustics Conf., AIAA 93-4404 (1993)]. These models are
dissipationless. In this paper, it will be shown how dissipation effects can be
combined with these lattice gas models. It is known that a random walk of
lattice gas particles can simulate dissipation effects. The random walk and the
motion of lattice gas particles for wave propagation can be combined using a
similar method to that used to obtain a lattice gas sound propagation model for
a two-dimensional square lattice from a one-dimensional lattice gas sound
propagation model. One can also apply the concept of our lattice gas models to
the simulation of fluid dynamic nonlinearities and the simulation of sound
propagation in moving media.