Investigations of the Motion of Discrete-Velocity Gases

Abstract

The accomplishments of this grant include: (1) A direct simulation Monte Carlo method for rarefied gasdynamics, patterned after the DSMC of G. A. Bird, in which molecular velocities are discretized to be integers (IDSMC) was developed. The method has been implemented on coarse-grained multi-computers such as the Intel iPSC, Symult 2010 and Intel Gamma with a self-adaptive rectangular mesh to optimize load balancing. (2) A finite-difference method for solving the discrete-velocity (lattice gas) Boltzmann equations has been formulated and implemented. Calculations were made of problems in heat transfer, shock wave structure and vapor deposition. (3) The applicability of multi-speed discrete-velocity gases to compressible flows has been examined from a fundamental point of view. The equation of state, the anisotropies and the advection velocities for multi-speed models on the square and triangular lattices were derived. It was shown that the pathologies shown by multi-speed lattice gases can be made rather small.

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Document Details

Document Type
Technical Report
Publication Date
Jun 02, 1992
Accession Number
ADA253728

Entities

People

  • B. Sturtevant

Organizations

  • California Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Boltzmann Equation
  • Channel Flow
  • Compressible Flow
  • Computational Fluid Dynamics
  • Computational Science
  • Computers
  • Equations
  • Flow
  • Heat Transfer
  • Monte Carlo Method
  • Navier Stokes Equations
  • Shock
  • Shock Waves
  • Simulations
  • Three Dimensional
  • Two Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Dynamics.
  • Parallel and Distributed Computing.