Nonlinear Acoustics in Diatomic Gases Using Direct Simulation Monte Carlo
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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The Direct Simulation Monte Carlo DSMC method has been very successful for the study of many problems in rarefied gas dynamics and hypersonic flow. The extension to applications such as acoustics will provide a useful tool for capturing all physical properties of interest for nonlinear acoustic problems, such as dispersion, attenuation, harmonic generation and nonequilibrium effects. The validity of DSMC for the entire range of Knudsen numbers Kn, where Kn is defined as the mean free path divided by the wavelength, allows for the exploration of sound propagation at low Kn low frequency, atmospheric conditions as well as sound propagation at high Kn high frequency, dilute gases, or in microdevices. This paper will present the application of DSMC to nonlinear acoustics in monatomic and diatomic gases for varying values of Kn.
- Fluid Mechanics
- Statistics and Probability