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Theoretical Considerations about Near-Wall Turbulence and Resulting Flow Control Schemes |
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| Authors: | Bettina Frohnapfel Jovan Jovanovi? Yosuke Hasegawa Nobuhide Kasagi |
| Institution: | 1. Center of Smart Interfaces, TU Darmstadt, Germany;2. Center of Smart Interfaces, TU Darmstadt, Germany
Chair of Fluid Mechanics, University of Erlangen, Germany;3. Center of Smart Interfaces, TU Darmstadt, Germany Dept. of Mechanical Eng., The University of Tokyo, Japan;4. Dept. of Mechanical Eng., The University of Tokyo, Japan |
| Abstract: | Based on analytical considerations about how near-wall turbulence needs to be modified in order to reduce the momentum loss towards solid walls and to yield lower energy losses, a mechanism of turbulent drag reduction is proposed. This mechanism suggests that drag reducing flow control at high Reynolds numbers should be designed to minimize the turbulent dissipation rate. A previously published approach on how a reduction of the turbulent dissipation in the near-wall region can be achieved is analyzed further. The obtained results provide some new insight on the parameters that need to be considered when designing flow control schemes for skin friction drag reduction. (© 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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