A dynamic wall model for Large-Eddy simulations of wind turbine dedicated airfoils

The Science of Making Torque from Wind 2014

Calafell, J.^1,2 ; Lehmkuhl, O.^1,2 ; Carmona, A.^1 ; Pérez-Segarra, C.D.^1 ; Oliva, A.^1

Heat and Mass Transfer Technological Center, Polytechnical University of Catalonia (UPC), Colom 11, 08222 Terrassa, Barcelona, Spain^1

Termo Fluids, S.L., Av. Jacquard 97-E, 08222 Terrassa, Barcelona, Spain^2

关键词: Eddy viscosity model;    High Reynolds number;    Large angle of attacks;    Mean velocity profiles;    Momentum equation;    Multi-scale frameworks;    Near-wall region;    Numerical results;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012147/pdf
DOI  :  10.1088/1742-6596/524/1/012147

来源: IOP

【 摘 要 】

This work aims at modelling the flow behavior past a wind turbine dedicated airfoil 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. Momentum equations have been solved with a parallel unstructured symmetry preserving formulation while the wall-adapting local-eddy viscosity model within a variational multi-scale framework (VMS- WALE) is used as the subgrid-scales model. Since LES calculations are still very expensive at high Reynolds Number, specially at the near-wall region, a dynamic wall model has been implemented in order to overcome this limitation. The model has been validated with a very unresolved Channel Flow case at Reτ2000. Afterwards, the model is also tested with the Ahmed Car case, that from the flow physics point of view is more similar to an stalled airfoil than the Channel Flow is, including flow features as boundary layer detachment and recirculations. This case has been selected because experimental results of mean velocity profiles are available. Finally, a flow around a DU-93-W-210 airfoil is computed at Re 3 x 106and with an AoA of 15°. Numerical results are presented in comparison with Direct Numerical Simulation (DNS) or experimental data for all cases.