F307 CONTROL OF WALL SHEAR TURBULENCE WITH ARRAYED MICRO SENSOR/ACTUATOR UNITS(Near-wall turbulence and its control)
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概要
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Direct numerical simulation of turbulent channel flow was made in order to evaluate the feedback control with distributed micro sensor/deformable actuator units. The authors have developed a new realizable algorithm to detect quasi-streamwise vortices near the wall by only using the information of wall shear stresses [1]. In the present study, this control algorithm is applied to the drag reduction of the turbulent channel flow. Contrary to the previous studies of turbulence control, each deformable actuator is assumed to have finite dimensions. By the present control scheme with the arrayed sensor/actuator units, 17% drag reduction is achieved through selective manipulation of the streamwise vortices. It is found that the deformation of the actuators directly attenuate the streamwise vortices. When the streamwise vortices are diminished, the meandering of the streak becomes inactive, and the regeneration cycle of the streamwise vortices is attenuated.
- 一般社団法人日本機械学会の論文
- 2000-10-01
著者
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Kasagi Nobuhide
Department Of Mechanical Engineering The University Of Tokyo
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Suzuki Yuji
Department Of Public Health And Environmental Medicine Jikei University School Of Medicine
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Endo Takahide
Department of Mechanical Engineering, The University of Tokyo
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Endo Takahide
Department Of Mechanical Engineering The University Of Tokyo:(present Address)computer And Informati
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Suzuki Yuji
Department Of Mechanical Engineering The University Of Tokyo
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Suzuki Yuji
Department Of Health Sciences School Of Health And Social Services Saitama Prefectural University
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SUZUKI Yuji
Department of Agriculture, Graduate School of Agricultural Science, Tohoku University
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