LES of the flow around a circular cylinder of finite height

Abstract The paper presents large eddy simulations of the flow around a surface-mounted circular cylinder of height 2.5 times the diameter at a Reynolds number of Re=43 000 . In the first part, the different modelling parameters are discussed with respect to their influence on the computed results. One of the findings is that, on the relatively coarse grid employed, the dynamic model is deficient and yields a too short recirculation region. The results obtained with the Smagorinsky model are in fairly good agreement with measurements. In the second part of the paper a detailed analysis of the results in physical terms is provided and related to findings in the literature. In particular, the existence of tip vortices and an arch vortex in the average flow downstream of the free end is demonstrated.

[1]  Y. Uematsu,et al.  Aerodynamic forces on circular cylinders of finite height , 1994 .

[2]  R. So,et al.  Aspect ratio effect on flow-induced forces on circular cylinders in a cross-flow , 1991 .

[3]  Yukisada Sunabashiri,et al.  Vortex Shedding From a Circular Cylinder of Finite Length Placed on a Ground Plane , 1992 .

[4]  B. Cantwell,et al.  An experimental study of entrainment and transport in the turbulent near wake of a circular cylinder , 1983, Journal of Fluid Mechanics.

[5]  F. Wubs.  Notes on numerical fluid mechanics , 1985 .

[6]  Tetsushi Okamoto,et al.  The Experimental Investigation on the Flow Past a Circular Cylinder of Finite Length Placed Normal to the Plane Surface in a Uniform Stream , 1972 .

[7]  P. Moin,et al.  Numerical investigation of turbulent channel flow , 1981, Journal of Fluid Mechanics.

[8]  W. Rodi,et al.  Large Eddy Simulation for Complex Turbulent Flows of Practical Interest , 1996 .

[9]  B. Geurts,et al.  Database-analysis of errors in Large-Eddy Simulation , 2003 .

[10]  W. Rodi,et al.  Three-dimensional computation of flow past cylindrical structures and model cooling towers , 1989 .

[11]  Joel H. Ferziger,et al.  Status of Large Eddy Simulation: Results of a Workshop , 1997 .

[12]  H. Werner,et al.  Large-Eddy Simulation of Turbulent Flow Over and Around a Cube in a Plate Channel , 1993 .

[13]  I. Mabuchi,et al.  Flow around a finite circular cylinder on a flat plate , 1984 .

[14]  W. Rodi,et al.  Large Eddy Simulation of Flow around Circular Cylinders on Structured and Unstructured Grids , 2004 .

[15]  J. Fröhlich,et al.  Large Eddy Simulation of Flow around Circular Cylinders on Structured and Unstructured Grids, II , 2001 .

[16]  Stephen A. Jordan,et al.  Investigation of the cylinder separated shear-layer physics by large-eddy simulation , 2002 .

[17]  J. Fontes,et al.  Large-Eddy Simulation of the Flow around the Free End of a Circular Cylinder , 2003 .

[18]  C. Tropea,et al.  The Flow Around Surface-Mounted, Prismatic Obstacles Placed in a Fully Developed Channel Flow (Data Bank Contribution) , 1993 .

[19]  P. Moin,et al.  A dynamic subgrid‐scale eddy viscosity model , 1990 .

[20]  Joel H. Ferziger,et al.  A fluid mechanicians view of wind engineering: Large eddy simulation of flow past a cubic obstacle , 1997 .

[21]  D. .. Farivar,et al.  Turbulent uniform flow around cylinders of finite length , 1981 .