The effect of stable stratification on fluid particle dispersion

M. Aartrijk, van, H.J.H. Clercx

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

1 Citaat (Scopus)
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Samenvatting

The dispersion of fluid particles in statistically stationary stably stratified turbulence is studied by means of direct numerical simulations. Due to anisotropy of the flow, horizontal and vertical dispersion show different behavior. Singleparticle dispersion in horizontal direction is similar to that in isotropic turbulence for short times, but shows a long-time growth rate larger than ¿ t. In vertical direction three successive regimes can be identified: a classical t2-regime, a plateau which scales as N-2 and a diffusion limit ¿ t. By forcing the flow and performing long-time simulations we were able to observe this last regime, which was predicted but not observed before in purely stratified forced turbulence. A model based on the assumed shape of the velocity autocorrelation function correctly predicts these three regimes. The vertical mean-squared separation of particle pairs shows two plateaus that are not present in isotropic turbulence. They can be linked with characteristics of the flow. Also here the diffusion limit is found.
Originele taal-2Engels
TitelProceedings of the 477th EUROMECH Colloquium on Particle-Laden Flow: from Geophysical to Kolmogorov Scales, June 21-23, 2006, Enschede, The Netherlands
RedacteurenB.J. Geurts, H.J.H. Clercx, W.S.J. Uijttewaal
Plaats van productieDordrecht
UitgeverijSpringer
Pagina's151-163
ISBN van geprinte versie978-1-4020-6217-9
StatusGepubliceerd - 2007
Evenement477th EUROMECH Colloquium on Particle-Laden Flow: from Geophysical to Kolmogorov Scales, June 21-23, 2006, Enschede, The Netherlands - Enschede, Nederland
Duur: 21 jun. 200623 jun. 2006

Publicatie series

NaamErcoftac Series
Volume11
ISSN van geprinte versie1382-4309

Congres

Congres477th EUROMECH Colloquium on Particle-Laden Flow: from Geophysical to Kolmogorov Scales, June 21-23, 2006, Enschede, The Netherlands
Land/RegioNederland
StadEnschede
Periode21/06/0623/06/06
Ander477th EUROMECH Colloquium on Particle-Laden Flow: from Geophysical to Kolmogorov Scales, Enschede, The Netherlands

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