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Stratified Taylor–Green vortex by lattice Boltzmann methods: Influence of stencils, forcing schemes, and collision models

  • Stably stratified Taylor–Green vortex simulations are performed by lattice Boltzmann methods (LBM) and compared to other recent works using Navier–Stokes solvers. The density variation is modeled with a separate distribution function in addition to the particle distribution function modeling the flow physics. Different stencils, forcing schemes, and collision models are tested and assessed. The overall agreement of the lattice Boltzmann solutions with reference solutions from other works is very good, even when no explicit subgrid model is used, but the quality depends on the LBM setup. Although the LBM forcing scheme is not decisive for the quality of the solution, the choice of the collision model and of the stencil are crucial for adequate solutions in underresolved conditions. The LBM simulations confirm the suppression of vertical flow motion for decreasing initial Froude numbers. To gain further insight into buoyancy effects, energy decay, dissipation rates, and flux coefficients are evaluated using the LBM model for various Froude numbers.

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Document Type:Article
Author:Dominik Wilde, Sheel Nidhan, Hieu T. Pham, Holger Foysi, Dirk Reith, Sutanu Sarkar
Parent Title (English):Computers & Fluids
Article Number:105838
Number of pages:11
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2023/02/28
Copyright:© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY licence
Funding:D.W. is supported by German Research Foundation (DFG) project FO 674/17-1.
Keyword:Atmosphere flow; Flux coefficient; Lattice Boltzmann Method; Ocean flow; Stratified flow; Taylor–Green vortex
Departments, institutes and facilities:Fachbereich Ingenieurwissenschaften und Kommunikation
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Entry in this database:2023/03/24
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International