## Detached-eddy simulations past a circular cylinder.(English)Zbl 0990.76032

From the summary: The flow is calculated with laminar separation at Reynolds numbers 50,000 and 140,000, and with turbulent separation (TS) at 140,000 and $$3\times 10^6$$. 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 a turbulence model controls the turbulent separation. The agreement is quite good for drag, shedding frequency, pressure, and skin friction. However, the 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.

### MSC:

 76F65 Direct numerical and large eddy simulation of turbulence 76F06 Transition to turbulence 76D10 Boundary-layer theory, separation and reattachment, higher-order effects 76M20 Finite difference methods applied to problems in fluid mechanics
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