What is it about?
Flow separation (stall) occurs when an airfoil/wing is set at a large angle with respect to the flow. However when the angle is changing rapidly, separation is delayed (dynamic stall). In this work, a criteria is developed using a simple low-order flow simulation technique to predict dynamic stall. The results agree very well with computations performed with a high order model using Computational Fluid Dynamics (CFD) techniques.
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Why is it important?
The proposed criteria in this work is very simple and computationally inexpensive. The low order method used takes seconds on a desktop to compute while higher order prediction would normally take few hours using the same computational resources. Hence, this new approach can be used in design and optimization of airfoils and wings undergoing unsteady motion.
Perspectives
I hope to develop this criteria more so that it is applicable to more generalized motion as well as to three-dimensional flows.
Shereef Sadek
King Saud University
Read the Original
This page is a summary of: A Novel Leading Edge Vortex Onset Criterion for An Airfoil Undergoing Constant Pitch Rate Motion, July 2021, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2021-2523.
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