Topics in Detached-Eddy Simulation
DES has been rather successful and well-understood, and has not required any essential modification since its creation in 1997. However, perfection is not expected from any method in an endeavor as complex as the numerical prediction of turbulence, especially since the numerical power at the engineers’ disposal remains marginal for many “real-life” problems, and utterly insufficient for the rest. Therefore, RANS-LES hybrids will be helpful for many years, but user training and judgment will be essential as will experience sharing via publications. Not only is the approach imperfect, but it can be mis-used; in that sense, robustness almost becomes a liability. Fully solving the issue of ambiguous grids is a priority, but has proven to be a resilient difficulty. The RANS component also may be improved, with the usual emphasis on separation. Another welcome change would be a numerically efficient system to control laminar regions; a magnificent one would be to predict transition, within the Navier-Stokes solution and even in unstructured grids.
KeywordsEddy Viscosity Unstructured Grid RANS Model Suction Slot Grid Count
Unable to display preview. Download preview PDF.
- 1.P. R. Spalart, W.-H. Jou, M. Strelets, S. R. Allmaras: Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach. First AFOSR International Conference on DNS/LES, Aug. 4–8 1997, Ruston, Louisiana.Google Scholar
- 2.M. Shur, P. R. Spalart, M. Strelets, A. Travin: Detached-eddy simulation of an airfoil at high angle of attack. 4th Int. Symp. Eng. Turb. Modelling and Measurements, May 24–26 1999, Corsica. Elsevier.Google Scholar
- 5.C. P. Mellen, J. Frölich, W. Rodi: Lessons from the European LESFOIL project on LES of flow around an airfoil. AIAA J. 41,4:573–581 (2003).Google Scholar
- 6.I. Mary, P. Sagaut: Large eddy simulation of flow around an airfoil near stall. AIAA J. 40,6:1139–1145 (2002).Google Scholar
- 7.P. Batten, U. Goldberg, S. Chakravarthy: LNS — an approach towards embedded LES. AIAA-2002-0427.Google Scholar
- 8.F. R. Menter, M. Kuntz, R. Bender: A scale-adaptive simulation model for turbulent flow predictions. AIAA 2003-0767.Google Scholar
- 9.R. Allen, F. Mendonça, D. Kirkham: RANS and DES turbulence model predictions of noise on the M219 cavity at M=0.85. Colloquium EUROMECH 449, Dec. 9–12 2003, Chamonix, France.Google Scholar
- 10.S. A. Morton, J. R. Forsythe, K. D. Squires, K. E. Wurtzler: Assessment of unstructured grids for detached-eddy simulation of high Reynolds number separated flows. 8th ISGG Conf., Honolulu, June 2002.Google Scholar
- 12.S. Deck, E. Garnier, P. Guillen: Turbulence modelling applied to space launcher configurations. J. Turbulence 3 (2002).Google Scholar
- 13.F. R. Menter, M. Kuntz, L. Durand: Adaptation of eddy viscosity turbulence models to unsteady separated flow behind vehicles. Symp. “The aerodynamics of heavy vehicles: trucks, buses and trains”. Monterey, USA, Dec. 2–6 2002.Google Scholar
- 17.M. Strelets: Detached Eddy Simulation of massively separated flows. AIAA-2001-0879.Google Scholar
- 19.S. A. Morton, M. B. Steenman, R. M. Cummings, J. R. Forsythe: DES grid resolution issues for vortical flows on a delta wing and an F-18C. AIAA-2003-1103.Google Scholar