A Threshold Line Dissociation Model for the Direct Simulation Monte Carlo Method,

Abstract

A new dissociation model for the direct simulation Monte Carlo (DSMC) method is formulated using the threshold line concept. This model considers in some detail the coupling between the vibrational energy distribution of molecules in a gas and the rate of dissociation. For a particular reaction, the new threshold line model only requires determination of a leading multiplicative constant and is therefore significantly less deterministic than existing DSMC chemistry models. The new mode is evaluated in a heat bath under equilibrium and nonequilibrium conditions. It is also employed to calculate hypersonic shock waves of nitrogen and air. Comparison of the results generated with the new model is made with existing experimental data and with previous computational results. The more detailed DSMC implementation reveals properties of the threshold line dissociation model not apparent in the previous continuum implementation.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1996
Accession Number
ADA324950

Entities

People

  • Iain D. Boyd

Organizations

  • Sibley School of Mechanical and Aerospace Engineering

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Reactions
  • Coefficients
  • Computational Fluid Dynamics
  • Couplings
  • Data Science
  • Dissociation
  • Experimental Data
  • Fluid Dynamics
  • Heat Of Activation
  • Mathematical Analysis
  • Molecules
  • Monte Carlo Method
  • Nitrogen
  • Shock
  • Shock Waves
  • Simulations
  • Waves

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Computational Modeling and Simulation
  • Quantum Chemistry

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flight