LES and DES of Swirling Flow with Rotor-Stator Interaction

  • Ardalan JavadiEmail author
  • Håkan Nilsson
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 130)


A highly swirling turbulent flow engendered by the rotor-stator interaction of a swirl generator is investigated using LES and DES. The delayed DES Spalart-Allmaras (DDES-SA), improved DDES-SA, shear stress transport DDES (DDES-SST) and a dynamic k-equation LES are studied. A mesh sensitivity study is performed on the hybrid methods, including the ability to capture the details of the flow field. It is shown that all the methods are capable of predicting the large-scale flow features, e.g. the vortex breakdown and the corresponding on-axis recirculation region. It is also shown that all the hybrid methods capture most of the small-scale coherent structures, even with a relatively coarse mesh resolution. The various shielding functions of the hybrid methods are analyzed, distinguishing the location of the transition between RANS and LES mode.


Guide Vane Draft Tube Vortex Breakdown Computational Fluid Dynamic Code Swirl Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The research presented was carried out as a part of the “Swedish Hydropower Centre—SVC”. SVC is established by the Swedish Energy Agency, Elforsk and Svenska Kraftnät together with Luleå University of Technology, The Royal Institute of Technology, Chalmers University of Technology and Uppsala University, The computational facilities are provided by C\(^{3}\)SE, the center for scientific and technical computing at Chalmers University of Technology, and SNIC, the Swedish National Infrastructure for Computing.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Division of Fluid DynamicsChalmers University of TechnologyGothenburgSweden

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