Journal
JOURNAL OF FLUID MECHANICS
Volume 824, Issue -, Pages 388-412Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2017.356
Keywords
boundary layer separation; boundary layer stability; transition to turbulence
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Funding
- European Research Council (ERC) [291094-ELBM, ETH-32-14-2]
- Swiss National Super Computing Center CSCS [s492, s630]
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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 x 10(4), at an angle of attack alpha = 4 degrees, 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 T10(6) blade profiles, at a chord Reynolds number of Re = 6 x 10(4) or Re = 1 : 48 x 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.
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