|Publisher DOI:||10.1007/978-3-030-27607-2_1||Title:||Performance of Under-Resolved, Model-Free LBM Simulations in Turbulent Shear Flows||Language:||English||Authors:||Gehrke, Martin
|Issue Date:||2020||Publisher:||Springer||Source:||Notes on Numerical Fluid Mechanics and Multidisciplinary Design (143): 3-18 (2020)||Part of Series:||Notes on numerical fluid mechanics and multidisciplinary design||Volume number:||143||Abstract (english):||
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.
|ISSN:||1860-0824||Institute:||Fluiddynamik und Schiffstheorie M-8||Document Type:||Chapter (Book)||Project:||Transitions-Manipulation
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