Modeling of Low-Speed Rarefied Gas Flows Using a Combined ES-BGK/DSMC Approach (Preprint)

Abstract

Modeling of low speed gas flows at moderate Knudsen numbers, where conventional continuum CFD methods are inapplicable and kinetic methods are either inaccurate or prohibitively expensive, presents a significant challenge for computational modeling. In this work, an approach that combines a finite-volume solution of the ES-BGK model kinetic equation and the statistical DSMC method to accurately predict radiometric forces on a vane in large vacuum chamber filled with rarefied gas is presented. The approach in effect combines the accuracy of a statistical solution of the Boltzmann equation with the numerical efficiency of a deterministic solution of simplified model kinetic equations.

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Document Details

Document Type
Technical Report
Publication Date
Jun 04, 2009
Accession Number
ADA510535

Entities

People

  • Andrew D. Ketsdever
  • Natalia Gimelshein
  • Nathaniel Selden
  • Sergey F. Gimelshein

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Accuracy
  • Air Force Research Laboratories
  • Boltzmann Equation
  • Chambers
  • Computational Fluid Dynamics
  • Computational Modeling
  • Computational Science
  • Equations
  • Flow
  • Fluid Mechanics
  • Gas Dynamics
  • Gas Flow
  • Knudsen Number
  • Mechanics
  • Rarefied Gases
  • Temperature Gradients
  • Vacuum Chambers

Fields of Study

  • Physics

Readers

  • Aerospace Propulsion Engineering.
  • Computational Fluid Dynamics (CFD)