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Turbulence structure for plane Poiseuille–Couette flow and implications for drag reduction over surfaces with slip |
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| Authors: | Nicholas B Spencer Lloyd L Lee Ramkumar N Parthasarathy Dimitrios V Papavassiliou |
| Affiliation: | 1. School of Chemical, Biological and Materials Engineering, The University of Oklahoma, 100 East Boyd St., SEC T‐335, Norman, Oklahoma 73019, U.S.A.;2. Chemical and Materials Engineering, California State University, Pomona, California, U.S.A.;3. School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, Oklahoma, U.S.A.;4. Sarkeys Energy Center, The University of Oklahoma, Norman, Oklahoma, U.S.A. |
| Abstract: | Direct numerical simulations were used to simulate plane channel and plane Poiseuille–Couette flows. For Poiseuille–Couette flow, the walls of the channel were moving with a specified velocity. This is equivalent to forcing a slip velocity at the wall of the channel, and such flow behaviour can be viewed as the effect due to an ultra‐hydrophobic wall. It was found that the location of the zero Reynolds stress value shifted towards the wall moving in the streamwise direction. The near‐wall eddies were found to be longer and weaker than for the plane‐Poiseuille channel flow. It appears that such an eddy structure can lead to turbulence drag reduction. |
| Keywords: | direct numerical simulation turbulence drag reduction velocity slip |