Sensitivity of the least stable modes to passive control for a flow around an elastically mounted circular cylinder

We present a method to calculate the sensitivity of two least stable eigenvalues with respect an external forcing added in fluid-structure interaction system (FSIS). Sensitivity computations are performed by setting proportional flow velocity applied local point domain. find that fields FSIS can be very different from its fixed structure counterpart. For elastic vary according reduced velocity. These allow for passive control strategies, as confirmed nonlinear simulations which result vortex-induced vibration attenuation or mitigation, depending on case.