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Communication Dans Un Congrès Année : 2013

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

Résumé

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.
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Dates et versions

hal-01071647 , version 1 (06-10-2014)

Identifiants

  • HAL Id : hal-01071647 , version 1
  • ENSAM : http://hdl.handle.net/10985/8695

Citer

Agathe Chouippe, Éric Climent, Dominique Legendre, Céline Gabillet. Numerical simulations of drag modulation by microbubbles in a turbulent Taylor-Couette flow. 8th International Conference on Multiphase Flow (ICMF), May 2013, North Korea. 11p. ⟨hal-01071647⟩

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