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A dynamic wall model for large eddy simulation on unstructured meshes. Application to wind turbine dedicated airfoils

DOI: 10.1615/ICHMT.2015.THMT-15.380
pages 231-234

J. Calafell
Heat and Mass Transfer Technological Center, Polytechnical University of Catalonia (UPC) Colom 11, 08222, Terrassa, Barcelona; Termo Fluids, S.L., Avda. Jaquard, 97 1-E, 08222 Terrassa (Barcelona), Spain

O. Lehmkuhl
Heat and Mass Transfer Technological Center, Polytechnical University of Catalonia (UPC) Colom11, 08222, Terrassa, Barcelona, Spain; Termo Fluids, S.L., Magi Colet, 8, 08204 Sabadell (Barcelona), Spain

Ivette Rodriguez
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain

Assensi Oliva
Centre Tecnologic de Transferencia de Calor (CTTC), Universitat Politecnica de Catalunya (UPC), Colom 11, 08222 Terrassa, Barcelona, Spain

C. D. Perez-Segarra
Heat and Mass Transfer Technological Center (CTTC) Universitat Politecnica de Catalunya - BarcelonaTech (UPC) Colom 11, 08222 Terrassa, Barcelona, Spain

Sinopsis

This work aims at modeling the flow behavior past an airfoil used for wind turbine blades at high Reynolds number and large angle of attack (AoA). The DU-93-W-210 airfoil has been selected. To do this, Large Eddy Simulations (LES) have been performed. Since LES calculations of resolved wall flows at high Reynolds Number are still computationally very expensive, a new Dynamic Wall Model (DWM) for unstructured meshes has been implemented in order to overcome this limitation. The DWMis validated with a very unresolved Channel Flow case at Reτ = 4200. Once the model is verified, it is used to resolve the flow around a wind turbine dedicated airfoil (DU-93-W-210) in stall condition and at Re = 3×106. Numerical results are presented in comparison with Direct Numerical Simulation (DNS), wall resolved LES and experimental data depending on the case.

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