Adaptive flow control of a freely plunging circular cylinder under flow-structure interaction

In this study, model-reference adaptive control (MRAC) is applied to reduce the vortex-induced vibration (VIV) of a freely plunging circular cylinder in uniform freestream under flow-structure interaction. The resolvent operator of the flow past around a stationary circular cylinder serves as the reference model for MARC in order to generate estimated responses of the system without VIV in a short time. Time-varying adaptive control gains are computed to guide the nonlinear FSI system to approach the flow condition of the reference model. Results show that at Reynolds number 100, MRAC with tangential actuations near the flow separation points are capable to achieve robust fluctuation reductions in lift of 85% and in drag of 93%.

This project was supported by the National Science and Technology Council, Taiwan.