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Title: Alternative drag coefficient in the wake of an isolated bluff body
Authors: Alam, MM
Zhou, Y
Issue Date: 22-Sep-2008
Source: Physical review. E, Statistical, nonlinear, and soft matter physics, Sept. 2008, v. 78, no. 3, 036320, p. 1-9
Abstract: An alternative drag coefficient C[sub d][sup a] [=F̄∕(1/2ρU²[sub ∞]U[sub ∞]T[sub s])], is proposed for an isolated bluff-body wake, where F̅ is the drag force on the body per unit length, U[sub ∞] is the free-stream velocity, ρ is the density of fluid, and T[sub s] is the vortex shedding period. Theoretical analysis presently conducted indicates that, while the conventional drag coefficient C[sub d] [=F̄∕(1/2ρU²[sub ∞] d)] may be interpreted as the intensity of the mean kinetic energy deficit distributed over the characteristic length of cylinder height d, C[sup a] [sub d] is the intensity of the mean kinetic energy deficit distributed over the characteristic length of the Karman vortex wavelength U[sub ∞]T[sub s]. Therefore, C[sup a] [sub d] may be considered to be a drag coefficient with the characteristic length given by U[sub ∞]T[sub s], instead of d. As long as a bluff body is isolated, without energy exchange between the cylinder and its support, this drag coefficient is invariant, as confirmed by our experimental data as well as those in the literature, with respect to the bluff-body geometry, angle of attack, and Reynolds number, with a caveat of limited cases examined presently.
Keywords: Drag
Vortices
Wakes
Publisher: American Physical Society
Journal: Physical review. E, Statistical, nonlinear, and soft matter physics 
ISSN: 1539-3755
EISSN: 1550-2376
DOI: 10.1103/PhysRevE.78.036320
Rights: Physical Review E © 2008 The American Physical Society. The Journal's web site is located at http://pre.aps.org/
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