Adjoint based optimization and control of a separated boundary-layer flow

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• 作者：Pierre-Yves Passaggia ; ^{pierre-yves.passaggia@onera.fr} ; ^{passaggia@irphe.univ-mrs.fr} ; Uwe Ehrenstein ^{ehrenstein@irphe.univ-mrs.fr}
• 关键词：Adjoint-based optimization ; Flow separation ; Instabilities ; Control
• 刊名：European Journal of Mechanics - B/Fluids
• 出版年：2013
• 出版时间：September-October, 2013
• 年：2013
• 卷：41
• 期：Complete
• 页码：169-177
• 全文大小：5223 K

文摘

An adjoint based optimization procedure for the nonlinear Navier-Stokes system is implemented and applied to the dynamics of a separated boundary-layer flow over a bump. For this open flow configuration, boundary conditions which are compatible between the direct and adjoint system are implemented using the influence matrix technique. Beyond a critical Reynolds number, the flow is unstable and subject to instabilities with multiple time-scales. Computing iteratively optimal initial perturbations, the most sensitive regions to forcing are highlighted. Wall blowing-suction actuators are then introduced at these locations and their capability of controlling the unstable linear and nonlinear dynamics is explored, by means of the adjoint based numerical algorithm.