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ACTIVE CONTROL OF TAYLOR-GÖTLER VORTICES IN TURBULENT CURVED CHANNEL FLOW

Chunxiao Xu
Department of Engineering Mechanics Tsinghua University Beijing 100084, PR China

Zhaoshun Zhang
Department of Engineering Mechanics, Tsinghua University, Beijing, China 100084

Jung-ll Choi
Dept. of Computational Science and Engineering Yonsei University Seoul, 120-749, Korea

Hyung Jin Sung
Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea

Resumo

Active control of Taylor-Götler vortices in turbulent curved channel flow is studied by direct numerical simulations. The drifting Taylor-Götler vortices are identified by a new proposed algorithm which is based on the wavelet transform of the wall information. The opposition control similar to Choi, Moin & Kim (1994) is applied to a turbulent curved channel flow to attenuate the large scale Taylor-Götler vortices and the attendant small scale vortices near the wall. Several active cancellations are tested to assess the effectiveness of the controls. It is found that a combined active cancellation at the concave wall makes the Taylor-Götler vortices break up to smaller vortices and weaken their strengths and contributions to Reynolds stress.