A unified expression for high-speed compressible segregated consistent lattice Boltzmann methods, namely, pressure-based and improved density-based methods, is given. It is theoretically proved that in the absence of forcing terms, these approaches are strictly identical and can be recast in a unique form. An important result is that the difference with classical density-based methods lies in the addition of fourth-order term in the equilibrium function. It is also shown that forcing terms used to balance numerical errors in both original pressure-based and improved density-based methods can be written in a generalized way. A hybrid segregated efficient lattice-Boltzmann for compressible flow based on this unified model, equipped with a recursive regularization kernel, is proposed and successfully assessed on a wide set of test cases with and without shock waves.
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August 2021
Research Article|
August 02 2021
A unified hybrid lattice-Boltzmann method for compressible flows: Bridging between pressure-based and density-based methods
G. Farag
;
G. Farag
a)
Aix Marseille Univ, CNRS, Centrale Marseille
, M2P2 Marseille, France
a) Author to whom correspondence should be addressed: [email protected]
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T. Coratger;
T. Coratger
Aix Marseille Univ, CNRS, Centrale Marseille
, M2P2 Marseille, France
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G. Wissocq
;
G. Wissocq
Aix Marseille Univ, CNRS, Centrale Marseille
, M2P2 Marseille, France
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S. Zhao (赵崧)
;
S. Zhao (赵崧)
Aix Marseille Univ, CNRS, Centrale Marseille
, M2P2 Marseille, France
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P. Boivin
;
P. Boivin
b)
Aix Marseille Univ, CNRS, Centrale Marseille
, M2P2 Marseille, France
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P. Sagaut
P. Sagaut
Aix Marseille Univ, CNRS, Centrale Marseille
, M2P2 Marseille, France
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a) Author to whom correspondence should be addressed: [email protected]
b)
Electronic mail: [email protected]
Physics of Fluids 33, 086101 (2021)
Article history
Received:
May 20 2021
Accepted:
July 13 2021
Citation
G. Farag, T. Coratger, G. Wissocq, S. Zhao, P. Boivin, P. Sagaut; A unified hybrid lattice-Boltzmann method for compressible flows: Bridging between pressure-based and density-based methods. Physics of Fluids 1 August 2021; 33 (8): 086101. https://doi.org/10.1063/5.0057407
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