Accession Number : ADA324950

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

Corporate Author : CORNELL UNIV ITHACA NY DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Boyd, Iain D.

PDF Url : ADA324950

Report Date : MAY 1996

Pagination or Media Count : 9

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.

Descriptors :   *COMPUTERIZED SIMULATION, *MONTE CARLO METHOD, *HYPERSONIC FLOW, REPRINTS, CHEMICAL DISSOCIATION, MOLECULAR VIBRATION, THRESHOLD EFFECTS, SHOCK WAVES, COMPUTATIONAL FLUID DYNAMICS, GAS DYNAMICS, NONEQUILIBRIUM FLOW, CHEMICAL EQUILIBRIUM, MOLECULAR ENERGY LEVELS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE