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Performance of Under-Resolved, Model-Free LBM Simulations in Turbulent Shear Flows
Publikationstyp
Book Part
Date Issued
2020
Sprache
English
Author(s)
Institut
TORE-URI
First published in
Number in series
143
Start Page
3
End Page
18
Citation
Notes on Numerical Fluid Mechanics and Multidisciplinary Design (143): 3-18 (2020)
Publisher DOI
Scopus ID
Publisher
Springer
The paper outlines the predictive capabilities of lattice Boltzmann methods (LBM) in turbulent shear flows. Attention is devoted to a specific collision operator which relaxes the distribution functions in cumulant space. The study highlights the benefits of a carefully defined discrete collision operator by scrutinizing the numerical stability and the predictive accuracy for a wide scope of resolutions—ranging from DNS to RANS—when no ad hoc turbulence closure is employed. Examples included are concerned with two frequently computed fundamental flows, i.e. Taylor-Green vortex and channel flows. Results reveal a fair accuracy and a remarkably small resolution dependence for the investigated cumulant collision operator, which is quite the contrary for other collision models.