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Direct numerical simulation of turbulent plane Couette flowTurbulent plane Couette flow was numerically simulated at a Reynolds number (U(sub w)h/nu) of 6000, where U(sub w) is the relative wall speed and h is half the channel-height. Unlike in Poiseuille flow, where the mean shear rate changes its sign at the centerline, the sign of mean shear rate in plane Couette flow remains the same across the whole channel. This difference is expected to yield several differences between the two flows, especially in the core region. The most significant and dramatic difference observed was the existence of large-scale structures in the core region of the plane Couette flow. The large eddies are extremely long in the flow direction and fill the entire channel (i.e., their vertical extent is 2h). The large-scale structures have the largest contribution from the wavenumber (k(sub x)h,k(sub z)h) = (0, plus or minus 1.5), corresponding to a wavelength lambda(sub z)/h is approximately equal to 4. The secondary motion associated with the k(sub x)h = 0 mode consists of the large-scale vortices. The large eddies contribute about 30 percent of turbulent kinetic energy.
Document ID
19930073990
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Lee, Moon Joo
(Pohang Inst. of Science and Technology Republic Of Korea)
Date Acquired
August 16, 2013
Publication Date
February 1, 1991
Publication Information
Publication: Annual Research Briefs, 1990
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93N71437
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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