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Exploring k and epsilon with Modified Spalart–Allmaras One–Equation Model

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Rahman, Mizanur
dc.date.accessioned 2016-12-09T10:01:42Z
dc.date.available 2016-12-09T10:01:42Z
dc.date.issued 2012
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/23686
dc.description MEMO No CFD/MECHA-24-2012 DATE: November 15, 2012
dc.description.abstract Abstract: A wall–distance–free version of the Spalart–Allmaras (SA) one–equation model is proposed to account for the distinct effects of low-Reynolds number (LRN) and wall proximity. The turbulent kinetic energy k and the dissipation rate ε are evaluated using the ~vt–transport equation together with some empirical relations. The model coefficients/functions preserve the anisotropic characteristics of turbulence in the sense that they are sensitized to rotational and nonequilibrium flows. The model is validated against a few well-documented flow cases, yielding predictions in good agreement with the direct numerical simulation (DNS) and experimental data. Comparisons indicate that the present model offers some improvement over the Spalart–Allmaras one–equation model and competitiveness with the SST k–ω-model. Main result: Contrasting the predicted results with measurements demonstrates that the new model returns predictions comparable with the SA/SST model in most of the flow cases considered herein. The proposed model is wall-distance-free and applicable to arbitrary topology in conjunction with structured/unstructured grids, which in turn render it advantageous to the SA/SST model. en
dc.format.extent 29
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.subject.other Mechanical engineering en
dc.title Exploring k and epsilon with Modified Spalart–Allmaras One–Equation Model en
dc.type J Muu elektroninen julkaisu fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.contributor.school School of Engineering en
dc.contributor.department Sovelletun mekaniikan laitos fi
dc.contributor.department Department of Applied Mechanics en
dc.subject.keyword one–equation model en
dc.subject.keyword anisotropic coefficients en
dc.subject.keyword non–equilibrium flows en
dc.subject.keyword walldistance en
dc.identifier.urn URN:NBN:fi:aalto-201612085622
dc.type.dcmitype text en


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