Entropic multirelaxation lattice Boltzmann models for turbulent flows

Fabian Bösch, Shyam S. Chikatamarla, and Ilya V. Karlin
Phys. Rev. E 92, 043309 – Published 26 October 2015

Abstract

We present three-dimensional realizations of a class of lattice Boltzmann models introduced recently by the authors [I. V. Karlin, F. Bösch, and S. S. Chikatamarla, Phys. Rev. E 90, 031302(R) (2014)] and review the role of the entropic stabilizer. Both coarse- and fine-grid simulations are addressed for the Kida vortex flow benchmark. We show that the outstanding numerical stability and performance is independent of a particular choice of the moment representation for high-Reynolds-number flows. We report accurate results for low-order moments for homogeneous isotropic decaying turbulence and second-order grid convergence for most assessed statistical quantities. It is demonstrated that all the three-dimensional lattice Boltzmann realizations considered herein converge to the familiar lattice Bhatnagar-Gross-Krook model when the resolution is increased. Moreover, thanks to the dynamic nature of the entropic stabilizer, the present model features less compressibility effects and maintains correct energy and enstrophy dissipation. The explicit and efficient nature of the present lattice Boltzmann method renders it a promising candidate for both engineering and scientific purposes for highly turbulent flows.

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  • Received 31 May 2015
  • Revised 23 September 2015

DOI:https://doi.org/10.1103/PhysRevE.92.043309

©2015 American Physical Society

Authors & Affiliations

Fabian Bösch*, Shyam S. Chikatamarla, and Ilya V. Karlin

  • Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland

  • *boesch@lav.mavt.ethz.ch
  • chikatamarla@lav.mavt.ethz.ch
  • Corresponding author: karlin@lav.mavt.ethz.ch

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Issue

Vol. 92, Iss. 4 — October 2015

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