Dynamic stall is an unsteady flow event in several aerodynamic applications, such as vertical axis wind turbines and helicopter rotor blades. This phenomenon leads to unexpectedly high lift forces while inducing detrimental vibrations. Dynamic stall is characterized by the formation of a vortex near the leading edge of the airfoil. This vortex's formation significantly increases the lift force generated, but its detachment results in substantial load fluctuations and structural failures. The gravity of dynamic stall depends on the strength of the leading-edge vortex, influenced by several external factors associated with the flow dynamics, airfoil geometry, and motion kinematics. Most scenarios prone to dynamic stall involve intricate kinematics, from consistent variations in velocity or angle of attack to following nonlinear trajectories, such as curved paths. The intricacy of these kinematic patterns adds a layer of complexity to pinpointing the central contributor behind dynamic stall and adopting effective control strategies. Our research delves into studying the role of individual kinematic factors within complex systems, unraveling the chain of events leading to the growth and detachment of the leading edge vortex, and the flow reattachment upon airfoils exit from the critical conditions.

c26.mp4

Selected Publications: