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  Extreme fluctuations of the relative velocities between droplets in turbulent airflow

Saw, E.-W., Bewley, G. P., Ray, S. S., & Bec, J. (2014). Extreme fluctuations of the relative velocities between droplets in turbulent airflow. Physics of Fluids, 26, 111702-1-111702-7. doi:10.1063/1.4900848.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0EF1-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0EF2-9
Genre: Journal Article

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 Creators:
Saw, Ewe-Wei1, Author              
Bewley, Gregory P.1, Author              
Ray, Samriddhi Sankar, Author
Bec, Jérémie, Author
Affiliations:
1Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, escidoc:2063287              

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 Abstract: We compare experiments and direct numerical simulations to evaluate the accuracy of the Stokes-drag model, which is used widely in studies of inertial particles in turbulence. We focus on statistics at the dissipation scale and on extreme values of relative particle velocities for moderately inertial particles (St < 1). The probability distributions of relative velocities in the simulations were qualitatively similar to those in the experiments. The agreement improved with increasing Stokes number and decreasing relative velocity. Simulations underestimated the probability of extreme events, which suggests that the Stokes drag model misses important dynamics. Nevertheless, the scaling behavior of the extreme events in both the experiments and the simulations can be captured by the same multi-fractal model.

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Language(s): eng - English
 Dates: 2014-11
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 702239
DOI: 10.1063/1.4900848
 Degree: -

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Title: Physics of Fluids
  Alternative Title : Phys, Fluids
Source Genre: Journal
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Pages: - Volume / Issue: 26 Sequence Number: - Start / End Page: 111702-1 - 111702-7 Identifier: -