Decaying versus stationary turbulence in particle-laden isotropic turbulence

Heavy particle statistics modifications

Abouelmagd H. Abdelsamie, Chang Hoon Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The current paper examines the heavy particle statistics modification by two-way interaction in particle-laden isotropic turbulence in an attempt to interpret their statistics modification using the information of modulated turbulence. Moreover, we clarify the distinctions of this modification between decaying and stationary turbulence as an extension of our previous work [A. H. Abdelsamie and C. Lee, "Decaying versus stationary turbulence in particle-laden isotropic turbulence: Turbulence modulation mechanism," Phys. Fluids24, 015106 (2012)10.1063/1.3678332]. Direct Numerical Simulation (DNS) was carried out using 1283 grid points at a Taylor micro-scale Reynolds number of Rλ ~ 70. The effect of O(106) solid particles with a different Stokes number (St) was implemented as a point-force approximation in the Navier-Stokes equation. Various statistics associated with particle dispersion are investigated, and the auto-correlations models which was provided by Jung et al. ["Behavior of heavy particles in isotropic turbulence," Phys. Rev. E77, 016307 (2008)10.1103/PhysRevE.77.016307] are extended in the current paper. DNS results reveal that the two-way coupling interaction enhances the fluid and heavy particle auto-correlation functions and the alignment between their velocity vectors for all Stokes numbers in decaying and stationary turbulence, but for different reasons. The modification mechanisms of particle dispersion statistics in stationary turbulence are different from those in decaying turbulence depending on the Stokes number, particularly for St <1.

Original languageEnglish
Article number033303
JournalPhysics of Fluids
Volume25
Issue number3
DOIs
Publication statusPublished - 2013 Mar 19

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isotropic turbulence
turbulence
statistics
direct numerical simulation
autocorrelation
Navier-Stokes equation
Reynolds number
alignment
grids
interactions
modulation
fluids
approximation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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Decaying versus stationary turbulence in particle-laden isotropic turbulence : Heavy particle statistics modifications. / Abdelsamie, Abouelmagd H.; Lee, Chang Hoon.

In: Physics of Fluids, Vol. 25, No. 3, 033303, 19.03.2013.

Research output: Contribution to journalArticle

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