Calculation of shear layer length scale for airfoil in deep stall -- CFD Online Discussion Forums

July 16, 2021, 03:04	Calculation of shear layer length scale for airfoil in deep stall	#1
raviramesh10 Member Ravi Join Date: May 2017 Posts: 31 Rep Power: 8	Hello all, I am currently running a DDES, 2nd order unsteady simulation for an airfoil in deep stall (angle of attack (AoA) = $60^{\circ}$ ). The time discretization was performed by using a dual time-stepping scheme. My Reynolds number is of the order of $10^{5}$ , and my chord length is unity. In order to verify the results obtained from the PSD spectrum of the lift coefficient $C_{l}$ with experimental data, I would like to calculate the K-H instability frequency for this regime. I recently found a paper in which I found an empirical relationship for the same, and they had mentioned to use the shear layer thickness for the same. Does anyone know of a relationship between the shear layer thickness and airfoil properties, such as chord length and the AoA, or any other formulation? Hoping to hear from you all soon. Last edited by raviramesh10; July 17, 2021 at 09:02.

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