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An Experimental Study on Drag Reduction of Grooved Cylinders
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 Title & Authors
An Experimental Study on Drag Reduction of Grooved Cylinders
Im, Hui-Chang; Lee, Sang-Jun;
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Wake structures behind two circular cylinders with different groove configurations(U and V-shape) have been investigated experimentally. The results were compared with those for the smooth cylinder having the same diameter D. The drag force, mean velocity and turbulent intensity profiles of wake behind the cylinders were measured with varying the Reynolds number in the range of Re(sub)D=8,000∼14,000. As a result, the U-shaped groove was found to reduce the drag up to 18.6%, but the V-shaped groove reduced drag force only 2.5% compared with the smooth cylinder. As the Reynolds number increases, the vortex shedding frequency becomes a little larger than that of the smooth cylinder. The visualized flow using the smoke-wire and particle tracing methods shows the flow structure qualitatively.
Riblet;Drag Reduction;Grooved Cylinder;Flow Control;Flow Visualization;
 Cited by
Cantwell, B. J., 1981, 'Organized Motion in Turbulent Flow,' Annual Rev. Fluid Mech., 13, pp. 457-515 crossref(new window)

Robinson, S. K., 1991, 'Coherent Motions in the Turbulent Boundary Layer,' Annual Rev. Fluid Mech., 23, pp. 601-639 crossref(new window)

Gad-el-Hak, M., 1989, 'Flow Control,' Appl. Mech. Rev., 42, pp. 261-293

Walsh, M. J., 1982, 'Turbulent Boundary Layer Drag Reduction Riblets,' AIAA paper 82-0169

Walsh, M. J., 1983, 'Riblets as a Viscous Drag Reduction Technique,' AIAA Journal, Vol. 21, No. 4, pp. 485-486

Robert, J. P., 1992, 'Drag Reduction: an Industrial Challenge,' Proceedings of Special Course on Skin Friction Drag Reduction, Brussels, AGARD-VKI

Bacher, E. V. and Smith, C. R., 1986, 'Turbulent Boundary Layer Modification by Surface Riblets,' AIAA Journal, Vol. 24, No. 8, pp. 1382-1385

Choi, K. S., 1989, 'Near-Wall Structure of a Turbulent Boundary Layer with Riblets,' J. Fluid Mech., Vol. 208, pp. 417-458 crossref(new window)

Achenbach, E., 1971, 'Influence of Surface Roughness on the Crossflow Around a Circular Cylinder,' J. Fluid Mech., Vol. 46, pp. 321-335 crossref(new window)

Guven, O., Farell, C., Patel, V. C., 1980, 'Surface Roughness Effects on the Mean Flow Past Circular Cylinders,' J. Fluid Mech., Vol. 98, pp. 673-701 crossref(new window)

Ko, N.W.M., Leung, Y.C., and Chen, J.J.J., 1986, 'Flow Past V-Groove Circular Cylinder,' AIAA Journal, Vol. 25, No. 6, pp. 806-811

Leung, Y. C., Ko, N. W. M., 1991, 'Near Wall Characteristics of Flow over Grooved Circular Cylinder,' Exp. in Fluids, Vol. 10, pp. 322-332

Choi, H. C., Moin, P. and Kim, J., 1993, 'Direct Numerical Simulation of Laminar and Turbulent Flow over Riblets,' J. Fluid Mech., Vol. 255, pp. 503-539

이상현, 이상준, 1999, '반원형 리블렛 상부 난류 경계층의 유동구조 연구,' KSME J., 23, pp. 937-944

Lee, S. J., Lee, S. H., 2000, 'Flow Field Analysis of Turbulent Boundary Layer over a Riblet Surface,' Exp. in Fluids, Vol. 29, in press

Stansby, P. K., 1974, 'The Effect of Endplates on the Base Pressure Coefficient of a Circular Cylinder,' Aeronautical J., Vol. 78, pp. 36-37

Perry, A. E., 1982, Hot-Wire Anemometry, Clarendon Press Oxford

White, F. M., 1986, Fluid Mechanics, McGraw-Hill

Lee, S. J., Lee, S. H., 1999, 'Synchronized Smoke-Wire Technique for Flow Visualization of Turbulent Flows,' J. of Flow Visualization and Image Processing, Vol. 6, pp. 65-78

Tucker, V., and Parrott, G. C., 1970, 'Aerodynamics of Gliding Flight of Falcons and Other Birds,' J. Exp. Biol., Vol. 52, pp. 345-368

Strouhal, V., 1878, 'Uber eine Besondere Art der Tonerregung,' Ann. Physik(Leipzig)