Accession Number:

ADA510535

Title:

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

Descriptive Note:

Journal article

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE

Personal Author(s):

• Gimelshein, Natalia
• Gimelshein, Sergey
• Selden, Nathaniel
• Ketsdever, Andrew

Report Date:

2009-06-04

Pagination or Media Count:

14.0

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.

Descriptors:

• *RAREFIED GASES
• *GAS FLOW
• COMPUTATIONAL FLUID DYNAMICS
• VACUUM CHAMBERS
• BOLTZMANN EQUATION
• KNUDSEN NUMBER
• ACCURACY
• MATHEMATICAL MODELS
• LOW VELOCITY

Subject Categories:

• Fluidics and Fluerics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE