Reynolds averaged navier-stokes flow computation of RAE2822 airfoil using gas-kinetic BGK Scheme

Ong, Jiunn Chit and Omar, Ashraf Ali E. and Asrar, Waqar (2009) Reynolds averaged navier-stokes flow computation of RAE2822 airfoil using gas-kinetic BGK Scheme. In: International MultiConference of Engineers and Computer Scientists (IMECS), 18 - 20 March 2009, Hong Kong.

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Abstract

In this paper, a gas-kinetic solver is developed to solve Reynolds Averaged Navier-Stokes (RANS) equations in two-space dimensions generalized coordinates. The convection flux terms which appear on the left hand side of the RANS equations are discretized by a semi-discrete finite difference method. Then, the resulting inviscid flux functions are approximated by gas-kinetic BGK scheme which is based on the BGK model of the approximate collisional Boltzmann equation. The cell interface values required by the inviscid flux functions are reconstructed to second-order spatial accuracy via the MUSCL (Monotone Upstream-Centered Schemes for Conservation Laws) variable interpolation method coupled with a minmod limiter. As for the diffusion flux terms, they are discretized by a second-order central difference scheme. To account for the turbulence effect, a combined k-ε / k-ω SST (Shear-Stress Transport) two-equation turbulence model is used in the solver. An explicit-type time integration method known as the modified fourth-order Runge-Kutta method is used to march the solution to steady-state. Computation over the RAE2822 airfoil flow corresponding to transonic speed has been solved using the developed gas-kinetic solver. Accuracy of BGK scheme in solving viscous transonic turbulent flow over the airfoil will be examined. Results obtained from the computations are also compared with experimental data and will demonstrate that a very good agreement has been achieved.

Item Type:	Conference or Workshop Item (Full Paper)
Additional Information:	4441/6041 (Proceedings of the International MultiConference of Engineers and Computer Scientists 2009, ISBN: 9789881701275)
Uncontrolled Keywords:	BGK scheme, compressible turbulent flow, finite difference method, high-order accuracy, transonic airfoil
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Waqar Asrar
Date Deposited:	19 Oct 2011 14:51
Last Modified:	22 Nov 2011 05:24
URI:	http://irep.iium.edu.my/id/eprint/6041

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