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Variable High-Order Multiblock Overlapping Grid Methods for Mixed Steady and Unsteady Multiscale Viscous Flows,Part II:Hypersonic nonequilibrium Flows

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Communications in Computational Physics 2013年第2期13卷 583-602页

作者： Andrea Lani Björn Sjögreen H.C.Yee William D.Henshaw NASA Ames/Stanford Centre for Turbulence Research Palo AltoCAUSA Lawrence Livermore National Laboratory LivermoreCAUSA MS 258-5 NASA Ames Research CenterMoffett FieldCAUSA

The variable high-order multiblock overlapping(overset)grids method of Sj¨ogreen&Yee[CiCP,Vol.5,2009]for a perfect gas has been extended to nonequilibrium *** work makes use of the recently developed high-order well-balanced shock-capturing schemes and their filter counterparts[Wang et al.,***.,2009,2010]that exactly preserve certain non-trivial steady state solutions of the chemical nonequilibrium governing *** turbulence with strong shocks and flows containing both steady and unsteady components is best treated by mixing of numerical methods and switching on the appropriate scheme in the appropriate subdomains of the flow fields,even under the multiblock grid or adaptive grid refinement *** low dissipative sixth-or higher-order shock-capturing filter methods are appropriate for unsteady turbulence with shocklets,second-and thirdorder shock-capturing methods are more effective for strong steady or nearly steady shocks in terms of *** is anticipated that our variable high-order overset grid framework capability with its highly modular design will allow for an optimum synthesis of these new algorithms in such a way that the most appropriate spatial discretizations can be tailored for each particular region of the *** this paper some of the latest developments in single block high-order filter schemes for chemical nonequilibrium flows are applied to overset grid *** numerical approach is validated on a number of test cases characterized by hypersonic conditions with strong shocks,including the reentry flow surrounding a 3D Apollo-like NASA Crew Exploration Vehicle that might contain mixed steady and unsteady components,depending on the flow conditions.

关键词： Unstructured mesh hypersonic flows thermo-chemical nonequilibrium residual distribution schemes double cone

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Conservative Residual Distribution Method for Viscous Double Cone Flows in thermochemical nonequilibrium

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Communications in Computational Physics 2013年第2期13卷 479-501页

作者： Andrea Lani Marco Panesi Herman Deconinck Von Karman Institute for Fluid Dynamics Waterloosesteenweg 721640Sint Genesius RodeBelgium Institute for Computational Engineering and Sciences University of TexasAustinTexas 78712USA

Amulti-dimensionally upwind conservative ResidualDistribution algorithm for simulating viscous axisymmetric hypersonic flows in thermo-chemical nonequilibrium on unstructured grids is presented and validated in the case of the complex flowfield over a double cone *** resulting numerical discretization combines a state-of-the-art nonlinear quasi-monotone second order blended scheme for distributing the convective residual and a standard Galerkin formulation for the diffusive *** physical source terms are upwinded together with the convective *** results show an excellent agreement with experimental measurements and available literature.

关键词： Unstructured mesh hypersonic flows thermo-chemical nonequilibrium residual distribution schemes double cone

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