Simulation of turbulent flows with the entropic multirelaxation time lattice Boltzmann method on body-fitted meshes

We propose a body-fitted mesh approach based on a semi-Lagrangian streaming step combined with an entropy-based collision model. After determining the order of convergence of the method, we analyse the flow past a circular cylinder in the lower subcritical regime, at a Reynolds number $Re=3900$ , in...

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Bibliographic Details
Published in:Journal of fluid mechanics 2018-08, Vol.849, p.35-56
Main Authors: Di Ilio, G., Dorschner, B., Bella, G., Succi, S., Karlin, I. V.
Format: Article
Language:English
Subjects:
Circular cylinders
Computational fluid dynamics
Computer simulation
Cylinders
Dynamics
Engineering
Entropy
Finite element method
Flexibility
Fluid dynamics
Fluid flow
Fluid mechanics
Grants
Hydrodynamics
JFM Papers
Mathematical models
Methods
Reynolds number
Simulation
Stability
Streaming
Studies
Turbulence
Turbulence models
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Summary:We propose a body-fitted mesh approach based on a semi-Lagrangian streaming step combined with an entropy-based collision model. After determining the order of convergence of the method, we analyse the flow past a circular cylinder in the lower subcritical regime, at a Reynolds number $Re=3900$ , in order to assess the numerical performances for wall-bounded turbulence. The results are compared to experimental and numerical data available in the literature. Overall, the agreement is satisfactory. By adopting an efficient local refinement strategy together with the enhanced stability features of the entropic model, this method extends the range of applicability of the lattice Boltzmann approach to the solution of realistic fluid dynamics problems, at high Reynolds numbers, involving complex geometries.
ISSN:0022-1120
1469-7645
DOI:10.1017/jfm.2018.413