### Abstract

Original language | Undefined |
---|---|

Pages (from-to) | 2084-2089 |

Number of pages | 6 |

Journal | Physica D |

Volume | 237 |

Issue number | 14-17 |

DOIs | |

Publication status | Published - 2008 |

### Keywords

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

### Cite this

*Physica D*,

*237*(14-17), 2084-2089. https://doi.org/10.1016/j.physd.2008.01.016

}

*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.

Research output: Contribution to journal › Article › Academic › peer-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

Y1 - 2008

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

U2 - 10.1016/j.physd.2008.01.016

DO - 10.1016/j.physd.2008.01.016

M3 - Article

VL - 237

SP - 2084

EP - 2089

JO - Physica D

JF - Physica D

SN - 0167-2789

IS - 14-17

ER -