An intermittency transport model is proposed for modeling separated-flow transition. The model is based on earlier work on prediction of attached flow bypass transition and is applied for the first time to model transition in a separation bubble at various degrees of freestream turbulence. The model has been developed so that it takes into account the entrainment of the surrounding fluid. Experimental investigations suggest that it is this phenomena which ultimately determines the extent of the separation bubble. Transition onset is determined via a boundary layer correlation based on momentum thickness at the point of separation. The intermittent flow characteristic of the transition process is modeled via an intermittency transport equation. This accounts for both normal and streamwise variation of intermittency and hence models the entrainment of surrounding flow in a more accurate manner than alternative prescribed intermittency models. The model has been validated against the well-established T3L semicircular leading edge flat plate test case for three different degrees of freestream turbulence characteristic of turbomachinery blade applications.
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July 2004
Technical Papers
Intermittency Transport Modeling of Separated Flow Transition
J. Vicedo,
J. Vicedo
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
11
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S. Vilmin,
S. Vilmin
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
22
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W. N. Dawes,
W. N. Dawes
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
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A. M. Savill
A. M. Savill
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
33
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J. Vicedo
11
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
S. Vilmin
22
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
W. N. Dawes
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
A. M. Savill
33
CFD Laboratory, Engineering Department, University of Cambridge, Cambridge, UK
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI Dec. 2002; final revision Mar. 2003. Paper No. 2003-GT-38719. Review Chair: H. R. Simmons.
J. Turbomach. Jul 2004, 126(3): 424-431 (8 pages)
Published Online: September 3, 2004
Article history
Received:
December 1, 2002
Revised:
March 1, 2003
Online:
September 3, 2004
Citation
Vicedo, J., Vilmin, S., Dawes , W. N., and Savill, A. M. (September 3, 2004). "Intermittency Transport Modeling of Separated Flow Transition ." ASME. J. Turbomach. July 2004; 126(3): 424–431. https://doi.org/10.1115/1.1748393
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