Application of the k-ε turbulence model to buoyant adiabatic wall plumes / Michael A. Delichatsios in Transactions of the ASME . Journal of fluids engineering, Vol. 132 N° 6 (Juin 2010)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 132 N° 6 (Juin 2010) . - 05 p. Titre : Application of the k-ε turbulence model to buoyant adiabatic wall plumes Type de document : texte imprimé Auteurs : Michael A. Delichatsios, Auteur ; C. P. Brescianini, Auteur ; D. Paterson, Auteur Année de publication : 2010 Article en page(s) : 05 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : flow (dynamics)  turbulence  fluctuations (physics)  plumes (fluid dynamics)  mixtures Résumé : Computational fluid dynamics based on Reynolds averaged Navier–Stokes equations is used to model a turbulent planar buoyant adiabatic wall plume. The plume is generated by directing a helium/air source upwards at the base of the wall. Far from the source, the resulting plume becomes self-similar to a good approximation. Several turbulence models based predominantly on the k-ε modeling technique, including algebraic stress modeling, are examined and evaluated against experimental data for the mean mixture fraction, the mixture fraction fluctuations, the mean velocity, and the Reynolds shear stress. Several versions of the k-ε model are identified that can predict important flow quantities with reasonable accuracy. Some new results are presented for the variation in a mixing function for the mixture normal to the wall. Finally, the predicted (velocity) lateral spread is as expected smaller for wall flows in comparison to the free flows, but quite importantly, it depends on the wall boundary conditions in agreement with experiments, i.e., it is larger for adiabatic than for hot wall plumes. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Application of the k-ε turbulence model to buoyant adiabatic wall plumes [texte imprimé] / Michael A. Delichatsios, Auteur ; C. P. Brescianini, Auteur ; D. Paterson, Auteur . - 2010 . - 05 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 6 (Juin 2010) . - 05 p. Mots-clés : flow (dynamics)  turbulence  fluctuations (physics)  plumes (fluid dynamics)  mixtures Résumé : Computational fluid dynamics based on Reynolds averaged Navier–Stokes equations is used to model a turbulent planar buoyant adiabatic wall plume. The plume is generated by directing a helium/air source upwards at the base of the wall. Far from the source, the resulting plume becomes self-similar to a good approximation. Several turbulence models based predominantly on the k-ε modeling technique, including algebraic stress modeling, are examined and evaluated against experimental data for the mean mixture fraction, the mixture fraction fluctuations, the mean velocity, and the Reynolds shear stress. Several versions of the k-ε model are identified that can predict important flow quantities with reasonable accuracy. Some new results are presented for the variation in a mixing function for the mixture normal to the wall. Finally, the predicted (velocity) lateral spread is as expected smaller for wall flows in comparison to the free flows, but quite importantly, it depends on the wall boundary conditions in agreement with experiments, i.e., it is larger for adiabatic than for hot wall plumes. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

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