Boundary Layer Transition Prediction over Wind Turbine Blade Profile through Detached Eddy Simulation

This proposed study aims at simulating slightly separated flow over the NREL S826 wind turbine blade profile with delayed detached-eddy simulation (DDES) strategy. The Reynolds number is relatively low and the angles of attack are around the stall region so that flow is not massively detached. This type of flow where boundary layer transition and laminar separation take place is difficult to simulate by DDES. To handle the problem and increase the capability of DDES, three developments that have appeared recently in literature are combined. The first one is a modification to SpalartAllmaras (S-A) one equation, which allows setting initial eddy viscosity value as zero for apparent transition behavior. Secondly, the shear-layer-adapted subgrid length scale instead of the classical one, maximum edge length of cells, is used in the resolved mode of DDES. By this enhancement, emergence of turbulent content could be accelerated inside boundary layers in presence of instability. As a third one Bas-Cakmakcioglu (BC) algebraic transition model is adapted to the modified S-A turbulence equation. The simulations are being performed by an inhouse solver, METUDES, and some preliminary results are demonstrated. In the final manuscript, the results will be compared with those of available data from a DDES study that uses standard subgrid length scale, and from a RANS study that employs Langtry-Menter transition prediction model.
Citation Formats
Ö. Yalçın and Y. Özyörük, “Boundary Layer Transition Prediction over Wind Turbine Blade Profile through Detached Eddy Simulation,” presented at the 31st International Conference on Parallel Computational Fluid Dynamics, 2019, Antalya, TURKEY, 2019, Accessed: 00, 2021. [Online]. Available: