Maio 2014 vol. 1 num. 1 - 10th World Congress on Computational Mechanics

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A CLOSER LOOK AT LOW-SPEED PRECONDITIONING TECHNIQUES FOR THE EULER EQUATIONS OF GAS DYNAMICS

Moura, R. C. ; Antunes, A. P. ; Basso, E. ; Bigarella, E. D. V. ; Azevedo, J. L. F. ;

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It is widely known that compressible flow solvers usually behave badly in terms of both accuracy and convergence rate at the incompressible limit. The present paper focuses on presenting the fundamentals of low-speed preconditioning techniques in a detailed approach, with particular emphasis on the Euler equations in two-dimensional generalized coordinates. Issues related to eigenvalue scaling, local time-stepping correction, artificial dissipation adjustment and boundary conditions implementation are discussed. The computational tests are conducted using a finite difference code, which is constructed for structured grids in general curvilinear coordinates. Spatial discretization uses central differences plus added artificial dissipation. The time march can be performed with either explicit or implicit time discretization methods. Although the investigation is performed with a specific code, the conclusions reached in the process of the present research are quite general and, therefore, useful for CFD practitioners regardless of the type of method they work with. Several airfoil simulations are addressed in order to demonstrate the benefits or even the necessity of using low-speed preconditioning techniques in the context of aerospace applications.

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Palavras-chave: CFD, Low-speed flows, Preconditioning techniques,

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DOI: 10.5151/meceng-wccm2012-19066

Referências bibliográficas
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Como citar:

Moura, R. C.; Antunes, A. P.; Basso, E.; Bigarella, E. D. V.; Azevedo, J. L. F.; "A CLOSER LOOK AT LOW-SPEED PRECONDITIONING TECHNIQUES FOR THE EULER EQUATIONS OF GAS DYNAMICS", p. 2884-2899 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-19066

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