The Form Drag of Three-Dimensional Bluff Bodies Immersed in Turbulent Boundary Layers

[+] Author and Article Information
H. Sakamoto, M. Moriya, S. Taniguchi

Department of Mechanical Engineering, Kitami Institute of Technology, Kitami, 090, Japan

M. Arie

Hokkaido University, Sapparo, 060, Japan

J. Fluids Eng 104(3), 326-333 (Sep 01, 1982) (8 pages) doi:10.1115/1.3241841 History: Received April 06, 1981; Online October 26, 2009


Measurements of the pressure distributions on the three-dimensional bluff bodies are correlated with the characteristics of the smooth-wall turbulent boundary layers in which the bodies are immersed. The bluff bodies selected for measurement were a cube and a vertical circular cylinder which can be considered as typical examples of three-dimensional bluff bodies. Experimental data were collected to investigate the effects of (1) the variation of the height of bluff bodies h, (2) the characteristics of the smooth-wall boundary layers in which they are immersed, on the form drag acting on the three-dimensional bluff bodies. For flow with zero-pressure gradient, the form drag coefficients of the cube and the vertical circular cylinder defined by CDτ =D/(1/2ρuτ 2 h2 ) are found to be expressed as a power-law function of huτ /ν in the range of h/δ less than about 1.0, where D is the form drag, uτ the shear velocity, ν the kinematic viscosity and δ the thickness of the undisturbed boundary layer at the location of the bluff bodies. For h/δ>1.0, the drag coefficients are independent of the parameter uτ /U0 , being uniquely related to h/δ. Further, the pressure distributions along the front centerline of each bluff body can be expressed by a single curve irrespective of both the height of the bluff body and the boundary layer characteristics and show a good agreement with the dynamic pressure in an undisturbed boundary layer at the location of the bluff bodies in the range of about 0.2<y/h<0.7, where y is the distance from the wall.

Copyright © 1982 by ASME
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