Abstract
The characteristics of turbulent shear flow downstream of NACA23012 airfoil with ridge-ice contamination leading stall are investigated in this paper. A low-dissipated compressible N–S solver is employed to simulate its unsteadiness via Improved Delayed Detached Eddy Simulation (IDDES) with sufficient spatial and temporal resolution. Nonlinear phenomena of eddy dynamics, such as vortex pairing, shedding, merging and breaking down, are fully resolved with extremely fine grid scale over 0.2 billion. The calculated Reynolds number based on the airfoil chord length is near 2.1×106. High-fidelity results show that the turbulent shear stream quickly develops into tubular geometry after leaving the ridge. The shedding-off tubular geometries quickly show anisotropy, twist in all directions, and finally decomposed into turbulence. Large-scale structural interaction is found above the trailing edge zone, determined by the shedding-off vortex and the rolling-up flow from the lower surface of the airfoil. Using POD and DMD analysis, we make sense it as the cause of low-frequency oscillation of the shear layer and even the lift fluctuation.
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