Low-Order Modeling of Dynamic Stall on Airfoils in Incompressible Flow

Airfoil dynamic stall in incompressible flow is characterized by two interacting viscous flow phenomena: time-varying trailing-edge separation and the shedding of intermittent leading-edge-vortex structures. In the current work, a physics based low-order method capable of modeling the interactions b...

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Bibliographic Details
Published in:AIAA journal 2023-01, Vol.61 (1), p.206-222
Main Authors: Narsipur, Shreyas, Gopalarathnam, Ashok, Edwards, Jack R.
Format: Article
Language:English
Subjects:
Aerodynamic loads
Airfoils
Fluid flow
Incompressible flow
Mathematical models
Modelling
Parameters
Physics
Reynolds number
Stalling
Time dependence
Viscous flow
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Summary:Airfoil dynamic stall in incompressible flow is characterized by two interacting viscous flow phenomena: time-varying trailing-edge separation and the shedding of intermittent leading-edge-vortex structures. In the current work, a physics based low-order method capable of modeling the interactions between the two flow phenomena is developed with the aim of predicting dynamic stall with only a few empirical tuning parameters. Large computational datasets are used to understand the flow physics of unsteady airfoils so as to augment an inviscid, unsteady airfoil theory to model the time-dependent viscous effects. The resulting model requires only three empirical coefficients for a given airfoil and Reynolds number, which could be obtained from a single moderate-pitch-rate unsteady motion for that airfoil/Reynolds number combination. Results from the low-order model are shown to compare excellently with computational and experimental solutions, in terms of both aerodynamic loads and flow-pattern predictions. In addition to formulating a method with limited empirical dependencies, the current research provides valuable insights into the flow physics of unsteady airfoils and their connection to rapidly predictable theoretical parameters.
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J061595