Large-Eddy Simulations of High Reynolds Number Flow Around a Circular Cylinder
Large-eddy simulations (LES) of the transitional and turbulent flow around a circular cylinder at a subcritical Reynolds number of 140000 are performed with a novel technique using staggered Cartesian grids. This technique is implemented in the code MGLET, a parallel Cartesian Navier-Stokes solver for DNS and LES which uses second-order central space and time discretizations and fractional time-stepping together with an iterative solver for the pressure-Poisson equation. The simulations were performed on the Hitachi SR8000-F1 with maximally 16 nodes. They demonstrate the effect of the grid resolution and the need to properly resolve the boundary and shear layers in order to predict the near wake flow reliably. A still unresolved computational issue is, how the necessary size of the computational domain in spanwise direction, namely several cylinder diameters, can be practically achieved with the present days HP computer capacities.
KeywordsShear Layer Circular Cylinder Streamwise Velocity Reynolds Shear Stress Separate Shear Layer
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- 3.M. Manhart. Direct numerical simulation of turbulent boundary layers on high performance computers. In E. Krause and W. Jaeger, editors, High performance Computing in Science and Engineering 1998. Springer Verlag, 1999.Google Scholar
- 4.A. Meri, H. Wengle, M. Raddaoui, P. Chauve, and R. Schiestel. Large-eddy simulation of non-equilibrium inflow conditions and of the spatial development of a confined plane jet with co-flowing streams. In W. Rodi and D. Laurence, editors, Engineering Turbulence Modelling and Experiments 4, pages 197–206. Elsevier, Amsterdam, 1999.CrossRefGoogle Scholar
- 6.J. Neumann and H. Wengle. Active control of turbulent separated flows using large-eddy simulation. In B.J. Geurts, R. Friedrich, and O. Metais, editors, Direct and Large-Eddy Simulation IV, pages 427 434. Kluwer Academic Publishers, 2001.Google Scholar
- 7.J. Neumann and H. Wengle. DNS and LES of passively controlled turbulent backward-facing step flow. In Proc. of the IUTAM Symposium on ‘Unsteady Separated Flows’, Toulouse, France, April 8–12 2002.Google Scholar
- 8.J. Neumann and H. Wengle. Passive versus active control of backward-facing step flow: DNS/LES and POD analysis. In I.P. Castro, P.E. Hancock, and T.G. Thomas, editors, Advances in Turbulence IX, pages 573–576. CIMNE, Barcelona, 2002.Google Scholar
- 9.S. Song and J.K. Eaton. Experimental study on non-equilibrium turbulent boundary layer with separation, reattachment, and redevelopment. In Proc. of the 2nd Int. Symp. on Turbulence and Shear Flow Phenomena, pages 27–31 (Vol. II), Stockholm, Sweden, June 27–29 2001.Google Scholar
- 10.F. Tremblay, M. Manhart, and R. Friedrich. LES of flow around a circular cylinder at a subcritical reynolds number with cartesian grids. In R. Friedrich and W. Rodi, editors, Advances in LES of Complex Flows, pages 133–150. Kluwer Academic Publishers, 2002.Google Scholar
- 11.B. Wasistho and K.D. Squires. Numerical investigation of the separated flow over a smoothly contoured ramp. In Proc. of the 2nd Int. Symp. on Turbulence and Shear Flow Phenomena, pages 405–410 (Vol. III), Stockholm, Sweden, June 27–29 2001.Google Scholar