Convection in multiphase fluid flows using lattice Boltzmann methods

L. Biferale, P. Perlekar, M. Sbragaglia, F. Toschi

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85 Citations (Scopus)
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We present high-resolution numerical simulations of convection in multiphase flows (boiling) using a novel algorithm based on a lattice Boltzmann method. We first study the thermodynamical and kinematic properties of the algorithm. Then, we perform a series of 3D numerical simulations changing the mean properties in the phase diagram and compare convection with and without phase coexistence at Rayleigh number Ra~107. We show that in the presence of nucleating bubbles non-Oberbeck-Boussinesq effects develop, the mean temperature profile becomes asymmetric, and heat-transfer and heat-transfer fluctuations are enhanced, at all Ra studied. We also show that small-scale properties of velocity and temperature fields are strongly affected by the presence of the buoyant bubble leading to high non-Gaussian profiles in the bulk.
Original languageEnglish
Article number104502
Pages (from-to)104502-1/5
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 2012


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