A joint comprehensive validation activity on the structured numerical method elsA and the hybrid numerical method TAU was conducted with respect to dynamic stall applications. For the purpose of an improved two-dimensional prediction, the influences of several factors on the dynamic stall prediction were investigated. The validation was performed for three deep dynamic stall test cases of the rotor blade airfoil OA209 against experimental data from two-dimensional pitching airfoil experiments, covering low speed and high speed conditions The requirements for spatial discretization and for temporal resolution in elsA and TAU are shown. The impact of turbulence modeling is discussed for a variety of turbulence models ranging from one-equation Spalart-Allmaras-type models to state-of-the-art seven-equation Reynolds stress models. The influence of the prediction of laminar/turbulent boundary layer transition on the numerical dynamic stall simulation is described. Results of both numerical methods are compared to allow conclusions to be drawn with respect to an improved prediction of dynamic stall.
Improved two-dimensional dynamic stall prediction with structured and hybrid numerical methods
Verbesserte Vorhersage der zweidimensionalen, dynamischen Strömungsablösung mit strukturierten und hybriden Methoden
AHS International, Annual Forum, 65 ; 2434-2450
2009
17 Seiten, 33 Bilder, 1 Tabelle, 34 Quellen
Conference paper
English
Improved Two-Dimensional Dynamic Stall Prediction with Structured and Hybrid Numerical Methods
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