Testing Continuum and Non-Continuum Descriptions in High Speed Flows

Abstract

Detailed simulations were performed with a continuum-based Navier-Stokes, a gas kinetic Bhatnagar-Gross-Krook (BGK) and the Direct Simulation Monte Carlo (DSMC) flow solvers to identify and characterize the translational and internal energy mode relaxation in high speed flows. Argon and nitrogen shock structures were simulated to quantify the nonequilibrium state. A new multi-translational temperature gas kinetic model was developed to match the capability of DSMC. Bulk viscosity as an adjustable parameter to recover small departures from rotational equilibrium in the Navier-Stokes equations is explored in weak shock structures. In the context of nitrogen dissociation, the models of vibrational bias for the dissociation kinetics are presented.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 13, 2005
Accession Number
ADA446035

Entities

People

  • Dean C. Wadsworth
  • Eswar Josyula
  • Kun Xu

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Boltzmann Equation
  • Coefficients
  • Collisions
  • Diatomic Molecules
  • Distribution Functions
  • Energy
  • Energy Transfer
  • Equations
  • Flow
  • Gas Dynamics
  • Gas Flow
  • Heat Transfer
  • Navier Stokes Equations
  • Particle Collisions
  • Shock Waves

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.
  • Molecular Photonics/Laser Physics