CHOUIPPE, Agathe; CLIMENT, Éric; LEGENDRE, Dominique; GABILLET, Céline

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CHOUIPPE, Agathe
Institut de mécanique des fluides de Toulouse [IMFT]

CLIMENT, Éric
Institut de mécanique des fluides de Toulouse [IMFT]

LEGENDRE, Dominique
Institut de mécanique des fluides de Toulouse [IMFT]

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Proceedings of the 8th ICMF, 8th International Conference on Multiphase Flow (ICMF), 2013-05. 2013-05p. 11p

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The aim of our study is to investigate numerically the interaction between a dispersed phase composed of microbubbles and a turbulent Taylor-Couette flow (flow within the gap between two cylinders). We use the Euler-Lagrange approach based on Direct Numerical Simulation of the continuous phase flow equations and a Lagrangian tracking for the dispersed phase. Each bubble trajectory is calculated by integrating the force balance equation accounting for buoyancy, drag, added-mass, pressure gradient, and the lift forces. The numerical method has been adapted in order to take into account the feed-back effect of the dispersed bubbles on the carrying flow. Our approach is based on local volume average of the two-phase Navier-Stokes equations. Local and temporal variations of the bubble concentration and momentum source terms are accounted for in mass and momentum balance equations. A number of reference cases have been tested to validate the modelling approach and its numerical implementation. Then, our previous study of bubble dispersion has been extended to two-way coupling simulations of turbulent Taylor-Couette flows (only inner cylinder is rotating). Modulation of the drag will be discussed for different geometries, Reynolds numbers and bubble sizes. The results show that near-wall turbulent structures are modified by the presence of bubbles.< Réduire

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Numerical simulations of drag modulation by microbubbles in a turbulent Taylor-Couette flow

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