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Application of realizability and shock unsteadiness to k−ε simulations of under-expanded axisymmetric supersonic free jets / Babak Emami in Transactions of the ASME . Journal of fluids engineering, Vol. 132 N° 4 (Avril 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 4 (Avril 2010) . - 07 p. Titre : Application of realizability and shock unsteadiness to k−ε simulations of under-expanded axisymmetric supersonic free jets Type de document : texte imprimé Auteurs : Babak Emami, Auteur ; Markus Bussmann, Auteur ; Honghi Tran, Auteur Année de publication : 2010 Article en page(s) : 07 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : compressibility;  mach  number;  turbulence;  eddies  (fluid  dynamics);  viscosity;  shock  waves;  jets;  shock  (mechanics);  engineering  simulation;  equations Résumé : An explicit cell-centered finite volume solver coupled to a k−ε turbulence model corrected for structural compressibility fails to satisfactorily predict the behavior of under-expanded supersonic jets exhausting into still air, because the model does not properly account for the turbulence/shock wave interaction. Two approaches are examined: imposing a realizability constraint and taking into account shock unsteadiness effects. Although both corrections yield better agreement with experimental data of under-expanded jets, the realizability constraint yields better results than the shock unsteadiness correction. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Application of realizability and shock unsteadiness to k−ε simulations of under-expanded axisymmetric supersonic free jets [texte imprimé] / Babak Emami, Auteur ; Markus Bussmann, Auteur ; Honghi Tran, Auteur . - 2010 . - 07 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 4 (Avril 2010) . - 07 p. Mots-clés : compressibility;  mach  number;  turbulence;  eddies  (fluid  dynamics);  viscosity;  shock  waves;  jets;  shock  (mechanics);  engineering  simulation;  equations Résumé : An explicit cell-centered finite volume solver coupled to a k−ε turbulence model corrected for structural compressibility fails to satisfactorily predict the behavior of under-expanded supersonic jets exhausting into still air, because the model does not properly account for the turbulence/shock wave interaction. Two approaches are examined: imposing a realizability constraint and taking into account shock unsteadiness effects. Although both corrections yield better agreement with experimental data of under-expanded jets, the realizability constraint yields better results than the shock unsteadiness correction. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]