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Méthode de Boltzmann sur réseau améliorée pour gérer le rapport de densité élevé d’un écoulement diphasique.

An improved Lattice Boltzmann method to deal with large density ratio of two-phase flow.

Numéro : AB-SI1-1163

Auteurs : GAO H., LIU B.

Résumé

In this paper, a lattice Boltzmann method for simulating bubbles motion in liquid with large liquid-gas density ratio is proposed, a LBM scheme with optimized equilibrium distribution functions is used to solve the Cahn- Hilliard equation. In order to avoid numerical instability caused by a large density ratio, the second order upwind difference scheme with more accurate solution and more stable calculation process is used to calculate the first order derivative. Fourteen-point difference scheme is used for the second order derivative. The single bubble motion process and the double bubbles coalescence process in different liquid-gas systems, including water-air, water-vapor and Lithium Bromide solution-vapor in vertical ascending pipe, are simulated.

Détails

  • Titre original : An improved Lattice Boltzmann method to deal with large density ratio of two-phase flow.
  • Identifiant de la fiche : 30022719
  • Langues : Anglais
  • Source : International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Date d'édition : 07/08/2017

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