Combined Simulation with Real-Time Force Feedback: A New Tool for Experimental Fluid Mechanics

Fluid-structure interaction experiments are very demanding, because they involve complex structural dynamics interacting with turbulent viscous flows. The development of a new experimental methodology, wherein direct flow measurements and visualization are conducted in real time and fed back to drive an on-line numerical simulation, has generated new capabilities for the field. Problems of ensuring closed loop stability with minimal phase corruption are addressed through two on-going experimental efforts: compliant bluff-body/viscous wake interaction employing an active-compliance control system, and pressure-feedback control of a fish-like laboratory robot, the RoboTuna.