Abstract
High-fidelity unsteady Reynolds–averaged Navier–Stokes (URANS) and Menter-SST delayed detached-eddy simulations (DDES) of dynamic stall on a rotor with cyclic pitch control are presented and compared to experimental surface pressures and particle-image-velocimetry (PIV) data. Before the dynamic-stall event, the DDES suffers from modeled-stress depletion (MSD) leading to grid-induced separation (GIS) due to a breakdown of the boundary-layer shielding function \(f_d\). Combined with the “grey-area” problem, this leads to severe erroneous load peaks. After dynamic stall, flow is completely separated and only DDES shows realistic small-scale, incoherent vortical structures. Two approaches are investigated to eliminate MSD/GIS: Firstly, increasing the empirical constant \(C_{d1}\) of the \(f_d\) function to 30 basically eliminates GIS. Secondly, a non-local, grid-independent vorticity-integrated algebraic DES, which replaces the \(f_d\) function, is introduced that provides robust boundary-layer shielding and enables the LES mode in case of massive flow separation.
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Acknowledgements
This work was funded by DFG grant Untersuchung der dreidimensionalen dynamischen Strömungsablösung an Rotorblättern (investigation of three-dimensional dynamic stall on rotor blades). Computing resources were provided by the High Performance Computing Centre Stuttgart (HLRS) under project HELISIM.
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Letzgus, J., Weihing, P., Keßler, M., Krämer, E. (2020). Assessment of Delayed Detached-Eddy Simulation of Dynamic Stall on a Rotor. In: Hoarau, Y., Peng, SH., Schwamborn, D., Revell, A., Mockett, C. (eds) Progress in Hybrid RANS-LES Modelling . Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 143. Springer, Cham. https://doi.org/10.1007/978-3-030-27607-2_25
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