Form Drag of Fences Placed in Disturbed Turbulent Boundary Layers
Publication: Journal of Engineering Mechanics
Volume 125, Issue 4
Abstract
Wind tunnel studies on the drag characteristics of solid and porous fences placed in the turbulent boundary layer disturbed by the presence of an upstream fence are reported. The analysis of the data reveals that the outer region of the approach velocity profile also influences the drag, contrary to the implication from the relationship of Ranga Raju et al. that only the velocity distribution in the inner region is of consequence so far as the drag is concerned. A unique relationship has been obtained for the drag coefficient based on the average velocity over the height of the fence in terms of the porosity, the shape factor of the approach boundary layer, and an additional parameter characterizing the approach velocity distribution over the height of the fence. This relationship is valid for 2D solid and porous fences placed in a flow with a zero pressure gradient for the cases of disturbed and undisturbed boundary layers developed over smooth, transitional, and rough surfaces.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 125 • Issue 4 • April 1999
Pages: 419 - 425
History
Received: May 27, 1997
Published online: Apr 1, 1999
Published in print: Apr 1999
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