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Direct simulation of particle dispersion in a decaying isotropic turbulenceResults of a numerical investigation of the dispersion of solid particles in decaying isotropic turbulence are presented. The 3D time-dependent velocity field of a homogeneous nonstationary turbulence is computed using the method of direct numerical simulation (DNS). The dispersion characteristics of three different solid particles (corn, copper, and glass) injected in the flow are obtained by integrating the complete equation of particle motion along the instantaneous trajectories of 22-cubed particles for each particle type, and then by performing ensemble averaging. Good agreement was achieved between the present DNS results and the measured time development of the mean-square displacement of the particles. Questions of how and why the dispersion statistics of a solid particle differ from those of its corresponding fluid point and surrounding fluid and what influences inertia and gravity have on these statistics are also discussed.
Document ID
19930027572
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Elghobashi, S.
(NASA Ames Research Center Moffett Field, CA, United States)
Truesdell, G. C.
(California Univ. Irvine, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Journal of Fluid Mechanics
ISSN: 0022-1120
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
93A11569
Distribution Limits
Public
Copyright
Other

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