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Transitional flows with the entropic lattice Boltzmann method

Published online by Cambridge University Press:  05 July 2017

B. Dorschner
Affiliation:
Aerothermochemistry and Combustion Systems Laboratory, Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
S. S. Chikatamarla
Affiliation:
Aerothermochemistry and Combustion Systems Laboratory, Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
I. V. Karlin*
Affiliation:
Aerothermochemistry and Combustion Systems Laboratory, Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
*
Email address for correspondence: karlin@lav.mavt.ethz.ch

Abstract

The accuracy and performance of entropic multi-relaxation time lattice Boltzmann models are assessed for transitional flows of engineering interest. A simulation of the flow over a low-Reynolds-number $SD7003$ airfoil at $Re=6\times 10^{4}$, at an angle of attack $\unicode[STIX]{x1D6FC}=4^{\circ }$, is performed and thoroughly compared to available numerical and experimental data. In order to include blockage and curvature effects, simulations of the flow in a low-pressure turbine passage composed of $T106$ blade profiles, at a chord Reynolds number of $Re=6\times 10^{4}$ or $Re=1.48\times 10^{5}$, for different free-stream turbulence intensities are presented. Using a multi-domain grid refinement strategy in combination with Grad’s boundary conditions yields good agreement for all simulations. The results demonstrate that the entropic lattice Boltzmann model is a viable, parameter-free alternative to modelling approaches such as large-eddy simulations with similar resolution requirements.

Type
Papers
Copyright
© 2017 Cambridge University Press 

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