Performance of Under-Resolved, Model-Free LBM Simulations in Turbulent Shear Flows

Publikationstyp
Book part
Publikationsdatum
2020
Sprache
English
Author
Gehrke, Martin orcid-logo
Banari, Amir 
Rung, Thomas orcid-logo
Institut
Fluiddynamik und Schiffstheorie M-8 
TORE-URI
http://hdl.handle.net/11420/3866
First published in
Notes on numerical fluid mechanics and multidisciplinary design 
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
10.1007/978-3-030-27607-2_1
Scopus ID
2-s2.0-85075074615
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.