Simultaneous flow measurement and deformation tracking for passive flow control experiments involving fluid–structure interactions

Fluid–structure interactions (FSI) on highly flexible structures involve large deformations and require specific techniques for a thorough investigation of the flow field structural deformation. To this purpose, physics-informed method is introduced that allows simultaneous determination fields deformation by using Particle Image Velocimetry (PIV) raw images. The combines apriori knowledge mechanical characteristics structure with classical image processing segmentation. PIV recordings an actively pitched, deformable hydrodynamic profile experiment in closed water tunnel serve as example case. achieve accurate results, contour obtained from segmentation further defined under assumption its flexure can be described Euler–Bernoulli beam theory model. This makes it possible to determine neutral fiber final reconstruction becomes original geometry. resulting procedure recognition itself suitable cross-section measurements masking images improve processing. A test case comprising synthetic data similar application modeled geometry known shape used investigate accuracy validity measurements. Under conditions cyclic dynamic stall, mean absolute error 0.84° could reached, deterioration up 2° static stall. has major advantage compared other technically more sophisticated complex methods, such combination Laser interferometers combined Laser-Doppler Anemometry: usage single source both, fluid solid unified measurement method. Therefore direct comparison instantaneous possible. In consequence particular useful multi-physical processes involving extreme deformations, passive control soft actuated or robotics.