Please use this identifier to cite or link to this item: http://hdl.handle.net/11400/9771
Title: Large-eddy simulations of the turbulent Hartmann flow close to the transitional regime
Authors: Σαρρής, Ιωάννης Ε.
Κασινός, Σταύρος Χ.
Carati, Daniele
Item type: Journal article
Keywords: Magnetohydrodynamic;applied magnetic field;Numerical method;Αριθμητική μέθοδος;Εφαρμοζόμενο μαγνητικό πεδίο;Μαγνητοϋδροδυναμική
Subjects: Technology
Engineering
Τεχνολογία
Μηχανική
Issue Date: 5-May-2015
2007
Date of availability: 5-May-2015
Publisher: American Institute of Physics
Abstract: A series of large-eddy simulations(LES) of turbulent and transitional channel flows of a conductive fluid under the effect of a uniform magnetic field applied in the wall-normal direction, usually referred to as Hartmann flows, are performed using the dynamic Smagorinsky model. The flow is characterized by the hydrodynamicReynolds numberRe and the Hartmann number Ha that is related to the strength of the external magnetic field. Previous measurements and works on stability analysis have shown that a critical modified Reynolds number, based on the Hartmann layer thickness R=Re∕Ha, exists at approximately R=380. Here, the LES are used to investigate the laminarization of flow when decreasing R. Also, similarities of the turbulent flows are explored for different values of Re and Ha but the same values of R or of the interaction parameter N=Ha2/Re. The LES confirm that R is the relevant parameter that describes the transition and a critical Reynolds number for relaminarization is observed at R≈500. However, for turbulent flows at moderate values of the Ha and Re as considered in this study, the similarity with respect to N appears to be better than for R, especially for the first order statistics. Finally, the importance of the dynamic Smagorinsky model as the Hartmann number increases is discussed.
Language: English
Citation: SARRIS, I.E., KASSINOS, S.C. & CARATI, D. (2007). Large-eddy simulations of the turbulent Hartmann flow close to the transitional regime. Physics of Fluids. [Online] 19 (8). p.085109 - 085109-9. Available from: http://scitation.aip.org/[Accessed 28/08/2007]
Journal: Physics of Fluids
Type of Journal: With a review process (peer review)
Access scheme: Publicly accessible
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
URI: http://hdl.handle.net/11400/9771
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