Towards the closure of Collar’s triangle by optical diagnostics

An experimental methodology is proposed for the study of aeroelastic systems. The approach locally evaluates forces involved in Collar’s triangle, namely aerodynamic, elastic, and inertial forces. position flow tracers as well markers on object surface monitored by a volumetric PIV system. From recorded images, surfare are separated based their optical characteristics. resulting images then analysed Lagrangian particle tracking. elastic obtained solely analysing motion deformation solid object, whereas aerodynamic force distribution via pressure-from-PIV technique. Experiments conducted benchmark problem fluid-structure interaction, featuring flexible panel installed at trailing edge cylinder. A polynomial fit markers’ positions carried out to determine panel’s instantaneous shape, from which evaluated. pressure loads determined solution Poisson equation pressure, imposing adaptive boundary conditions that comply with panel. simultaneous measurement three allows assess equilibrium forces, turn close triangle.