Drag reduction of tractor-trailers using optimized add-on devices / Fu-Hung Hsu in Transactions of the ASME . Journal of fluids engineering, Vol. 132 N° 8 (Août 2010)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 132 N° 8 (Août 2010) . - 06 p. Titre : Drag reduction of tractor-trailers using optimized add-on devices Type de document : texte imprimé Auteurs : Fu-Hung Hsu, Auteur ; Roger L. Davis, Auteur Année de publication : 2010 Article en page(s) : 06 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : flow (dynamics)  turbulence  drag (fluid dynamics)  design  engineering simulation  vehicles  reduction  boats  fuel consumption Résumé : Tractor-trailers have a higher drag coefficient than other vehicles due to their bluff-body shape. Numerous add-on devices have been invented to help reduce drag and fuel consumption. The current research extends our previous idea of add-on humps and investigates their effect in conjunction with curved boat-tail flaps. Computational fluid dynamics in the form of unsteady Reynolds-averaged Navier–Stokes and detached-eddy simulations were used to determine viable design strategies. A 3D baseline computational model was constructed using an Ahmed body. Design optimization was applied on the new add-on devices. The results from the optimized design were shown to have a 50.9% reduction in drag coefficient. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Drag reduction of tractor-trailers using optimized add-on devices [texte imprimé] / Fu-Hung Hsu, Auteur ; Roger L. Davis, Auteur . - 2010 . - 06 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 132 N° 8 (Août 2010) . - 06 p. Mots-clés : flow (dynamics)  turbulence  drag (fluid dynamics)  design  engineering simulation  vehicles  reduction  boats  fuel consumption Résumé : Tractor-trailers have a higher drag coefficient than other vehicles due to their bluff-body shape. Numerous add-on devices have been invented to help reduce drag and fuel consumption. The current research extends our previous idea of add-on humps and investigates their effect in conjunction with curved boat-tail flaps. Computational fluid dynamics in the form of unsteady Reynolds-averaged Navier–Stokes and detached-eddy simulations were used to determine viable design strategies. A 3D baseline computational model was constructed using an Ahmed body. Design optimization was applied on the new add-on devices. The results from the optimized design were shown to have a 50.9% reduction in drag coefficient. DEWEY : 620.1 ISSN : 0098-2202 En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

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Quasi-1D unsteady conjugate module for rocket engine and propulsion system simulations / Bryan T. Campbell in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 2 (Fevrier 2009)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 131 N° 2 (Fevrier 2009) . - 09 p. Titre : Quasi-1D unsteady conjugate module for rocket engine and propulsion system simulations Type de document : texte imprimé Auteurs : Bryan T. Campbell, Auteur ; Roger L. Davis, Auteur Année de publication : 2009 Article en page(s) : 09 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : pressure  flow (dynamics)  heat transfer  fluids  engineering simulation  pipes  propulsion systems  equations  nitrogen  rocket engines  steady state  water Résumé : A new quasi-one-dimensional procedure (one-dimensional with area change) is presented for the transient solution of real-fluid flows in lines and volumes including heat transfer effects. The solver will be integrated into a larger suite of software modules developed for simulating rocket engines and propulsion systems. The solution procedure is coupled with a state-of-the-art real-fluid property database so that both compressible and incompressible fluids may be considered using the same procedure. The numerical techniques used in this procedure are described. Test cases modeling transient flow of nitrogen, water, and hydrogen are presented to demonstrate the capability of the current technique. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Quasi-1D unsteady conjugate module for rocket engine and propulsion system simulations [texte imprimé] / Bryan T. Campbell, Auteur ; Roger L. Davis, Auteur . - 2009 . - 09 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 2 (Fevrier 2009) . - 09 p. Mots-clés : pressure  flow (dynamics)  heat transfer  fluids  engineering simulation  pipes  propulsion systems  equations  nitrogen  rocket engines  steady state  water Résumé : A new quasi-one-dimensional procedure (one-dimensional with area change) is presented for the transient solution of real-fluid flows in lines and volumes including heat transfer effects. The solver will be integrated into a larger suite of software modules developed for simulating rocket engines and propulsion systems. The solution procedure is coupled with a state-of-the-art real-fluid property database so that both compressible and incompressible fluids may be considered using the same procedure. The numerical techniques used in this procedure are described. Test cases modeling transient flow of nitrogen, water, and hydrogen are presented to demonstrate the capability of the current technique. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

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