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

R. Volk, E. Calzavarini, G. Verhille, Detlef Lohse, N. Mordant, J.-F. Pinton, F. Toschi

Research output: Contribution to journalArticleAcademicpeer-review

53 Citations (Scopus)

Abstract

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.
Original languageUndefined
Pages (from-to)2084-2089
Number of pages6
JournalPhysica D
Volume237
Issue number14-17
DOIs
Publication statusPublished - 2008

Keywords

  • Lagrangian acceleration
  • Lagrangian turbulence
  • METIS-248972
  • Inertial particles
  • IR-79071

Cite this

Volk, R. ; Calzavarini, E. ; Verhille, G. ; Lohse, Detlef ; Mordant, N. ; Pinton, J.-F. ; Toschi, F. / Acceleration of heavy and light particles in turbulence: Comparison between experiments and direct numerical simulations. In: Physica D. 2008 ; Vol. 237, No. 14-17. pp. 2084-2089.
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abstract = "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.",
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Volk, R, Calzavarini, E, Verhille, G, Lohse, D, Mordant, N, Pinton, J-F & Toschi, F 2008, 'Acceleration of heavy and light particles in turbulence: Comparison between experiments and direct numerical simulations', Physica D, vol. 237, no. 14-17, pp. 2084-2089. https://doi.org/10.1016/j.physd.2008.01.016

Acceleration of heavy and light particles in turbulence: Comparison between experiments and direct numerical simulations. / Volk, R.; Calzavarini, E.; Verhille, G.; Lohse, Detlef; Mordant, N.; Pinton, J.-F.; Toschi, F.

In: Physica D, Vol. 237, No. 14-17, 2008, p. 2084-2089.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Acceleration of heavy and light particles in turbulence: Comparison between experiments and direct numerical simulations

AU - Volk, R.

AU - Calzavarini, E.

AU - Verhille, G.

AU - Lohse, Detlef

AU - Mordant, N.

AU - Pinton, J.-F.

AU - Toschi, F.

PY - 2008

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N2 - 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.

AB - 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.

KW - Lagrangian acceleration

KW - Lagrangian turbulence

KW - METIS-248972

KW - Inertial particles

KW - IR-79071

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