Acceleration of heavy and light particles in turbulence: Comparison between experiments and direct numerical simulations

PHYSICA D-NONLINEAR PHENOMENA

卷:237

Article

Volk, R.¹  Calzavarini, E.^2,3  Verhille, G.¹  Lohse, D.^2,3  Mordant, N.⁴  Pinton, J. -F.¹  Toschi, F.^5,6 

[1] CNRS, UMR5672, Ecole Normale Super Lyon, Phys Lab, F-69007 Lyon, France

[2] Univ Twente, Fac Sci, JM Burgers Ctr Fluid Dynam, NL-7500 AE Enschede, Netherlands

[3] Univ Twente, Impact Inst, NL-7500 AE Enschede, Netherlands

[4] CNRS, UMR8550, Ecole Normale Super Lyon, Lab Phys Stat, F-69007 Lyon, France

[5] CNR, Ist Appl Calcolo, I-00161 Rome, Italy

[6] Ist Nazl Fis Nucl, Sez Ferrara, I-00161 Rome, Italy

关键词: inertial particles;    Lagrangian acceleration;    Lagrangian turbulence;   

DOI  :  10.1016/j.physd.2008.01.016

来源: Elsevier

【 摘 要 】

We compare experimental data and numerical simulations for the dynamics of inertial particles with finite density in turbulence. In the experiment, bubbles and solid particles are optically tracked in a turbulent flow of water using an Extended Laser Doppler Velocimetry technique. The probability density functions (PDF) of particle accelerations and their auto-correlation in time are computed. Numerical results are obtained from a direct numerical simulation in which a suspension of passive pointwise particles is tracked, with the same finite density and the same response time as in the experiment. We observe a good agreement for both the variance of acceleration and the autocorrelation time scale of the dynamics; small discrepancies on the shape of the acceleration PDF are observed. We discuss the effects induced by the finite size of the particles, not taken into account in the present numerical simulations. (c) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

Free