Nonlinear Acoustics in Diatomic Gases Using Direct Simulation Monte Carlo

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jul 13, 2005
Accession Number
ADA445993

Entities

People

  • Amanda L. Danforth
  • Lyle N. Long

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Euler Equations
  • Fluid Mechanics
  • Gas Dynamics
  • Kinetic Theory
  • Knudsen Number
  • Mean Free Path
  • Monte Carlo Method
  • Object Oriented Programming
  • Parallel Computing
  • Physical Properties
  • Physics
  • Simulations
  • Standing Waves

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flight