Abstract
Detached-eddy simulation (DES) is used to study the massively separated flow over a rounded-corner square. The configuration is an idealization of the flow around a forebody cross section rotating at high angle of attack. Simulations are performed at sub- and supercritical Reynolds numbers, between which experimental measurements show a reversal of the side force. DES predictions are evaluated using experimental measurements and contrasted with unsteady Reynolds-averaged Navier-Stokes (URANS) results. The computations are also subjected to a moderate grid refinement, a doubling of the span-wise period, an enlargement of the domain in the other directions, and the removal of any explicit turbulence model. The sub- and supercritical flows are computed at Reynolds numbers of 10 5 and 8 × 10 5, respectively, and with the freestream at 10 deg angle of attack. Boundary-layer separation characteristics (laminar or turbulent) are established via the initial and boundary conditions of the eddy viscosity. Following boundary layer detachment, a chaotic and three-dimensional wake rapidly develops. For the supercritical flow, the pressure distribution is close to the measured values and both the streamwise and side forces are in adequate agreement with measurements. For the subcritical flow, DES side-force predictions do not follow the experimental measurements far enough to achieve reversal.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 959-966 |
| Number of pages | 8 |
| Journal | Journal of Fluids Engineering, Transactions of the ASME |
| Volume | 127 |
| Issue number | 5 |
| DOIs | |
| State | Published - Sep 2005 |
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ASJC Scopus subject areas
- Mechanical Engineering
- Fluid Flow and Transfer Processes
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Detached-eddy simulation of the separated flow over a rounded-corner square. / Squires, Kyle; Forsythe, James R.; Spalart, Philippe R.
In: Journal of Fluids Engineering, Transactions of the ASME, Vol. 127, No. 5, 09.2005, p. 959-966.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Detached-eddy simulation of the separated flow over a rounded-corner square
AU - Squires, Kyle
AU - Forsythe, James R.
AU - Spalart, Philippe R.
PY - 2005/9
Y1 - 2005/9
N2 - Detached-eddy simulation (DES) is used to study the massively separated flow over a rounded-corner square. The configuration is an idealization of the flow around a forebody cross section rotating at high angle of attack. Simulations are performed at sub- and supercritical Reynolds numbers, between which experimental measurements show a reversal of the side force. DES predictions are evaluated using experimental measurements and contrasted with unsteady Reynolds-averaged Navier-Stokes (URANS) results. The computations are also subjected to a moderate grid refinement, a doubling of the span-wise period, an enlargement of the domain in the other directions, and the removal of any explicit turbulence model. The sub- and supercritical flows are computed at Reynolds numbers of 10 5 and 8 × 10 5, respectively, and with the freestream at 10 deg angle of attack. Boundary-layer separation characteristics (laminar or turbulent) are established via the initial and boundary conditions of the eddy viscosity. Following boundary layer detachment, a chaotic and three-dimensional wake rapidly develops. For the supercritical flow, the pressure distribution is close to the measured values and both the streamwise and side forces are in adequate agreement with measurements. For the subcritical flow, DES side-force predictions do not follow the experimental measurements far enough to achieve reversal.
AB - Detached-eddy simulation (DES) is used to study the massively separated flow over a rounded-corner square. The configuration is an idealization of the flow around a forebody cross section rotating at high angle of attack. Simulations are performed at sub- and supercritical Reynolds numbers, between which experimental measurements show a reversal of the side force. DES predictions are evaluated using experimental measurements and contrasted with unsteady Reynolds-averaged Navier-Stokes (URANS) results. The computations are also subjected to a moderate grid refinement, a doubling of the span-wise period, an enlargement of the domain in the other directions, and the removal of any explicit turbulence model. The sub- and supercritical flows are computed at Reynolds numbers of 10 5 and 8 × 10 5, respectively, and with the freestream at 10 deg angle of attack. Boundary-layer separation characteristics (laminar or turbulent) are established via the initial and boundary conditions of the eddy viscosity. Following boundary layer detachment, a chaotic and three-dimensional wake rapidly develops. For the supercritical flow, the pressure distribution is close to the measured values and both the streamwise and side forces are in adequate agreement with measurements. For the subcritical flow, DES side-force predictions do not follow the experimental measurements far enough to achieve reversal.
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U2 - 10.1115/1.1990202
DO - 10.1115/1.1990202
M3 - Article
AN - SCOPUS:27344445012
VL - 127
SP - 959
EP - 966
JO - Journal of Fluids Engineering, Transactions of the ASME
JF - Journal of Fluids Engineering, Transactions of the ASME
SN - 0098-2202
IS - 5
ER -