Computational acoustics is the use and study of numerical techniques which can reveal solutions to acoustics problems that would be expensive to find experimentally. The theory behind computational acoustics is getting so good that often one will run a computer simulation to provide guidelines on how an experiment should be carried out.
One technique in computational acoustics pioneered by Yasushi Sudo and Dr. Sparrow is called the Latice Gas Time Domain (LGTD) method. For CAA, compuational aeroacoustics, and CP, computational propagation, the lattice gas time domain method shows very little (and in some problems zero) numerical dispersion and dissipation, unlike conventional finite diference, finite element, and boundary element methods. Hence, LGTD models can often use quite coarse grids compared to the previously mentioned methods, resulting in a great savings of computer memory and CPU time.
Here is a short movie showing how individual particles model acoustic propagation by moving on a discrete lattice in time and space:
QuickTime Movie (27K)
This animation shows one wavelength of a propagating single frequency sinusoidal wave, where the amplitude is decaying exponentially. In lattice gas simulations, only local communication is used between lattice nodes.
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Most recent update: 08/12/97
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