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2020 | OriginalPaper | Chapter

Assessment of Delayed Detached-Eddy Simulation of Dynamic Stall on a Rotor

Authors : Johannes Letzgus, Pascal Weihing, Manuel Keßler, Ewald Krämer

Published in: Progress in Hybrid RANS-LES Modelling

Publisher: Springer International Publishing

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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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Metadata
Title
Assessment of Delayed Detached-Eddy Simulation of Dynamic Stall on a Rotor
Authors
Johannes Letzgus
Pascal Weihing
Manuel Keßler
Ewald Krämer
Copyright Year
2020
DOI
https://doi.org/10.1007/978-3-030-27607-2_25

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