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

作者：Passaggia Pierre Yves^*; Ehrenstein Uwe

来源：European Journal of Mechanics - B: Fluids , 2013, 41: 169-177.

DOI：10.1016/j.euromechflu.2013.01.006

• Adjoint-based optimization
• Flow separation
• Instabilities
• Control

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.

• 出版日期2013-10