DOI: 10.1615/TSFP3
ACTIVE CONTROL OF TAYLOR-GÖTLER VORTICES IN TURBULENT CURVED CHANNEL FLOW
ABSTRAKT
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.