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Unified Gas Kinetic Scheme and Direct Simulation Monte Carlo Computations of High-Speed Lid-Driven Microcavity Flows

Published online by Cambridge University Press:  03 June 2015

Vishnu Venugopal  and
Sharath S. Girimaji
Vishnu Venugopal
Affiliation:
Department of Aerospace Engineering, Texas A&M University, College Station, TX-77843, United States of America
Sharath S. Girimaji*
Affiliation:
Department of Aerospace Engineering, Texas A&M University, College Station, TX-77843, United States of America
*
*Corresponding author. Email addresses: vishnuv@tamu.edu (V. Venugopal), girimaji@tamu.edu (S. S. Girimaji)
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Abstract

Accurate simulations of high-speed rarefied flows present many physical and computational challenges. Toward this end, the present work extends the Unified Gas Kinetic Scheme (UGKS) to a wider range of Mach and Knudsen numbers by implementing WENO (Weighted Essentially Non-Oscillatory) interpolation. Then the UGKS is employed to simulate the canonical problem of lid-driven cavity flow at high speeds. Direct Simulation Monte Carlo (DSMC) computations are also performed when appropriate for comparison. The effect of aspect ratio, Knudsen number and Mach number on cavity flow physics is examined leading to important insight.

Keywords

82C4076P0465C05UGKSDSMClid driven cavitykinetic theoryKnudsen number

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Type
Research Article
Information
Communications in Computational Physics , Volume 17 , Issue 5 , May 2015 , pp. 1127 - 1150
Copyright
Copyright © Global-Science Press 2015 

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