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Flow, Turbulence and Combustion

, Volume 99, Issue 3–4, pp 685–703 | Cite as

VLES Modeling of Flow Over Walls with Variably-shaped Roughness by Reference to Complementary DNS

  • Benjamin KrumbeinEmail author
  • Pourya Forooghi
  • Suad Jakirlić
  • Franco Magagnato
  • Bettina Frohnapfel
Article

Abstract

Turbulent flow over variably-shaped rough walls, characterized by either a regular or a random arrangement of axisymmetric roughness elements in an open channel flow configuration, is investigated computationally within a VLES (Very Large Eddy Simulation) framework by utilizing a volumetric forcing-based roughness model. The prime objective of the present work is to assess the roughness model’s capability to predict mean velocities and turbulent intensities in conjunction with this recently formulated hybrid LES/RANS (Reynolds-Averaged Navier-Stokes) model. The friction velocity-based Reynolds number is in the range Reτ = 460 − 500. A non-dimensional drag function accounting for the shape of the roughness elements is introduced and evaluated based on the results of complementary direct numerical simulations (DNS). The dynamics of the residual motion of the presently adopted VLES methodology is described by an appropriately modified elliptic-relaxation-based ζf (\(\zeta =\overline {v^{2}}/k\)) RANS model.

Keywords

DNS Hybrid LES/RANS (VLES) Elliptic relaxation eddy-viscosity model of turbulence Volumetric-forcing-based roughness modeling Open channel flow 

Notes

Acknowledgements

The financial support of the German Research Foundation (DFG) in the framework of the Collaborative Research Center/Transregio 150 (TP-B03 and TP-B02) is gratefully acknowledged. The authors furthermore would like to thank for the computing time granted on the Lichtenberg HPC at TU Darmstadt.

Compliance with Ethical Standards

Conflict of interests

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Benjamin Krumbein
    • 1
    Email author
  • Pourya Forooghi
    • 2
  • Suad Jakirlić
    • 1
  • Franco Magagnato
    • 2
  • Bettina Frohnapfel
    • 2
  1. 1.Institute of Fluid Mechanics and AerodynamicsTechnische Universität DarmstadtDarmstadtGermany
  2. 2.Karlsruhe Institute of TechnologyInstitute of Fluid MechanicsKarlsruheGermany

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