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Communication Dans Un Congrès Année : 2023

Thermal sub-grid boundary layer modelling around bubbles at moderate Reynolds and Prandtl numbers.

Résumé

This work focuses on thermal sub-grid modelling around bubbles at turbulent Reynolds numbers (up to 400) and moderate Prandtl numbers (up to 5). The increasing availability of computational resources allowed us to perform direct numerical simulations of bubbles dynamics in swarms at turbulent Reynolds numbers for RANS Euler-Euler modelling purposes. The very local thermal effects are not captured as precisely close to the interface due to phase change at P r > 1. Thermal sub-grid boundary layer modelling has been considered to enhance temperature prediction in the bubbles interface region. First, the current Front-Tracking framework TrioCFD used at CEA will be presented. The literature in terms of boundary layer modelling for concentration will be briefly described. Then, the sub-grid temperature modelling approach on a steady single rising bubble in an axisymmetric configuration has been performed a priori. Some analytical solutions in a 2D local spherical coordinate system have been derived. These radial solutions show free parameters that are fitted according to the temperature values in the bubbles neighbouring resolved field. The temperature gradient prediction performance will determine the choice of the analytical model over more complex approaches and its range of validity. In a second step, the micro-macro regions coupling of a one-dimensional analytical solution to the Stefan problem has been investigated. The analytical solution has been used locally to correct both diffusion, interfacial temperature gradient and liquid temperature extension over time (as part of a Ghost-fluid method). Some hints to perform more complex modelling will be finally given.
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Dates et versions

cea-04419819 , version 1 (26-01-2024)

Identifiants

  • HAL Id : cea-04419819 , version 1

Citer

Mathis Grosso, Guillaume Bois, Adrien Toutant. Thermal sub-grid boundary layer modelling around bubbles at moderate Reynolds and Prandtl numbers.. ICMF 2023 - 11th International Conference on Multiphase Flow, Apr 2023, Kobe, Japan. ⟨cea-04419819⟩
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