Detached-Eddy Simulations Past a Circular Cylinder |
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Authors: | Andrei Travin Michael Shur Michael Strelets Philippe Spalart |
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Institution: | (1) Federal Scientific Center ``Applied Chemistry', St. Petersburg, 197198, Russia;(2) Boeing Commercial Airplanes, P.O. Box 3707, Seattle, WA, 98124, U.S.A. |
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Abstract: | The flow is calculated with laminar separation (LS) at Reynolds numbers 50,000 and 140,000, and with turbulent separation
(TS) at140,000 and 3 × 106. The TS cases are effectively tripped, but compared with untripped experiments at very high Reynolds numbers. The finest
grid has about 18,000 points in each of 56 grid planes spanwise; the resolution is far removed from Direct Numerical Simulations,
and the turbulence model controls the separation if turbulent. The agreement is quite good for drag, shedding frequency, pressure,
and skin friction. However the comparison is obscured by large modulations of the vortex shedding and drag which are very
similar to those seen in experiments but also, curiously, durably different between cases especially of the LS type. The longest
simulations reach only about 50 shedding cycles. Disagreement with experimental Reynolds stresses reaches about 30%, and the
length of the recirculation bubble is about double that measured. The discrepancies are discussed, as are the effects of grid
refinement, Reynolds number, and a turbulence-model curvature correction. The finest grid does not give the very best agreement
with experiment. The results add to the validation base of the Detached-Eddy Simulation (DES) technique for smooth-surface
separation. Unsteady Reynolds-averaged simulations are much less accurate than DES for LS cases, but very close for TS cases.
Cases with a more intricate relationship between transition and separation are left for future study.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | separation simulation cylinder turbulence |
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