Developments in turbulence modelling with Reynolds-averaged Navier-Stokes equations

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Rautaheimo, Patrik
dc.date.accessioned 2012-02-13T12:20:53Z
dc.date.available 2012-02-13T12:20:53Z
dc.date.issued 2001-04-27
dc.identifier.isbn 951-22-5447-6
dc.identifier.issn 0001-687X
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2331
dc.description.abstract The performance of different low-Reynolds number turbulence models applied to various flows is described. The emphasis is put on Chien's k – ε model, an explicit algebraic Reynolds-stress model by Speziale et al., and a full Reynolds-stress closure. The Reynolds-stress closure of this work has been developed by the author by combining different existing models. Accurate numerical methods are developed to couple the momentum equations and the low-Reynolds number Reynolds-stress equations. Two methods are introduced and these vary depending on how much the source terms are taken into account implicitly. The production of turbulence can be used to couple the inviscid part of the momentum equations and the Reynolds-stress equations in the approximate Riemann solution. As demanding problems are computed, it has been essential to parallelize the computer code. This has been performed via a message passing package. The code shows an excellent parallel performance even in the most complex topologies simulated. In this thesis, validations are presented for ten different fluid dynamic problems. The test cases vary from a simple channel flow to complicated flows in rotating machinery. In the validations it is found that the Reynolds-stress closure generally performs better than the two-equation models in complex flows. Especially streamline curvature is better captured by the Reynolds-stress closure. For the skin friction, the present Reynolds-stress closure does not give satisfactory results, and thus, some further development is needed. For simpler situations the two-equation models give comparable or even better results than the more complex models. en
dc.format.extent 65, [105]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Acta polytechnica Scandinavica. Me en
dc.relation.ispartofseries 149 en
dc.relation.haspart P. Rautaheimo, T. Siikonen and A. Hellsten, Diagonalization of the Reynolds-Averaged Navier-Stokes Equations with the Reynolds-Stress Turbulence Model, IMACS-COST Conference on Computational Fluid Dynamics, Lausanne, Switzerland, September 13-15, 1995. [article1.pdf] © 1995 by authors.
dc.relation.haspart P. Rautaheimo and T. Siikonen, Implementation of the Reynolds-stress Turbulence Model, 3rd ECCOMAS Computational Fluid Dynamics Conference, Paris, France, September 9-13, 1996. [article2.pdf] © 1996 by authors.
dc.relation.haspart P. Rautaheimo, E. Salminen and T. Siikonen, Parallelization of a Multi-Block Navier-Stokes Solver, 3rd ECCOMAS Computational Fluid Dynamics Conference, Paris, France, September 9-13, 1996. [article3.pdf] © 1996 by authors.
dc.relation.haspart P. Rautaheimo and T. Siikonen, Simulation of a Flow in a Return Channel with a Deswirl Cascade Using Advanced Turbulence Modelling, 4th ECCOMAS Computational Fluid Dynamics Conference, Athens, Greece, September 7-11, 1998. [article4.pdf] © 1998 by authors.
dc.relation.haspart P. Rautaheimo, E. Salminen and T. Siikonen, Numerical Simulation of the flow in the NASA Low-Speed Centrifugal Compressor, submitted to ASME Journal of Turbomachinery. [article5.pdf] © 2001 by authors.
dc.relation.haspart P. Rautaheimo, E. Salminen, T. Siikonen and J. Hyvärinen, Turbulent Mixing Between VVER440 Fuel Bundle Subchannels: A CFD Study, Proceedings of the 9th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, San Francisco, California, October 3-8, 1999. [article6.pdf] © 1999 by authors.
dc.relation.haspart P. Rautaheimo and T. Siikonen, Improved Solid-Wall Boundary Treatment in Low-Reynolds Number Turbulence Models, accepted for publication in AIAA Journal.
dc.subject.other Mechanical engineering en
dc.title Developments in turbulence modelling with Reynolds-averaged Navier-Stokes equations en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Mechanical Engineering en
dc.contributor.department Konetekniikan osasto fi
dc.subject.keyword turbulence modelling en
dc.subject.keyword Reynolds-stress model en
dc.subject.keyword finite volume method en
dc.subject.keyword parallel computing en
dc.identifier.urn urn:nbn:fi:tkk-002766
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Applied Thermodynamics en
dc.contributor.lab Sovelletun termodynamiikan laboratorio fi


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