Light particle dispersion in stably stratified turbulence

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

Light particle dispersion in stably stratified turbulence

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Abstract

The trajectories of small inertial particles with densities of $O(\rho_{f})$ in turbulent flows can be computed using the Maxey-Riley equation. By means of direct numerical simulations we study the dispersion behavior of these light particles in statistically stationary stably stratified turbulence. The importance of the different forces that are acting on the particles is examined. It strongly depends on the density ratio. For $\rho_{p}/\rho_{f}=O(1)$ most forces are of the same order of magnitude. With increasing density ratio the relative importance of the different forces with respect to the Stokes drag decreases. For $\rho_{p}/\rho_{f}=O(10)$ mainly the Stokes drag, gravity, the pressure gradient and the Basset force remain relevant. Furthermore, the effect of the different forces on the dispersion and preferential concentration behavior of light particles will be discussed. The results are compared with those obtained for heavy particles. The results for light and heavy particles show a strong resemblance when the Stokes number is used as the parameter to express the particle properties. Moreover, the similarities and the differences between the behavior of light particles in isotropic and in stratified turbulence will be considered. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.GP.9

Original language	English
Title of host publication	Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008
Place of Publication	San Antonio, USA
Publication status	Published - 2008
Event	61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA - San Antonio Convention Center, San Antonio, TX, United States Duration: 23 Nov 2008 → 25 Nov 2008 http://www.aps.org/meetings/meeting.cfm?name=DFD08

Conference

Conference	61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA
Abbreviated title	DFD08
Country/Territory	United States
City	San Antonio, TX
Period	23/11/08 → 25/11/08
Internet address	http://www.aps.org/meetings/meeting.cfm?name=DFD08

Cite this

@inproceedings{2cf7d3bcbc5a4fcc986a0307e322c5e4,

title = "Light particle dispersion in stably stratified turbulence",

abstract = "The trajectories of small inertial particles with densities of $O(\rho_{f})$ in turbulent flows can be computed using the Maxey-Riley equation. By means of direct numerical simulations we study the dispersion behavior of these light particles in statistically stationary stably stratified turbulence. The importance of the different forces that are acting on the particles is examined. It strongly depends on the density ratio. For $\rho_{p}/\rho_{f}=O(1)$ most forces are of the same order of magnitude. With increasing density ratio the relative importance of the different forces with respect to the Stokes drag decreases. For $\rho_{p}/\rho_{f}=O(10)$ mainly the Stokes drag, gravity, the pressure gradient and the Basset force remain relevant. Furthermore, the effect of the different forces on the dispersion and preferential concentration behavior of light particles will be discussed. The results are compared with those obtained for heavy particles. The results for light and heavy particles show a strong resemblance when the Stokes number is used as the parameter to express the particle properties. Moreover, the similarities and the differences between the behavior of light particles in isotropic and in stratified turbulence will be considered. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.GP.9",

author = "H.J.H. Clercx and {Aartrijk, van}, M.",

year = "2008",

language = "English",

booktitle = "Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008",

note = "61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA, DFD08 ; Conference date: 23-11-2008 Through 25-11-2008",

url = "http://www.aps.org/meetings/meeting.cfm?name=DFD08",

}

Clercx, HJH & Aartrijk, van, M 2008, Light particle dispersion in stably stratified turbulence. in Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008. San Antonio, USA, 61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA, San Antonio, TX, United States, 23/11/08.

TY - GEN

T1 - Light particle dispersion in stably stratified turbulence

AU - Clercx, H.J.H.

AU - Aartrijk, van, M.

PY - 2008

Y1 - 2008

N2 - The trajectories of small inertial particles with densities of $O(\rho_{f})$ in turbulent flows can be computed using the Maxey-Riley equation. By means of direct numerical simulations we study the dispersion behavior of these light particles in statistically stationary stably stratified turbulence. The importance of the different forces that are acting on the particles is examined. It strongly depends on the density ratio. For $\rho_{p}/\rho_{f}=O(1)$ most forces are of the same order of magnitude. With increasing density ratio the relative importance of the different forces with respect to the Stokes drag decreases. For $\rho_{p}/\rho_{f}=O(10)$ mainly the Stokes drag, gravity, the pressure gradient and the Basset force remain relevant. Furthermore, the effect of the different forces on the dispersion and preferential concentration behavior of light particles will be discussed. The results are compared with those obtained for heavy particles. The results for light and heavy particles show a strong resemblance when the Stokes number is used as the parameter to express the particle properties. Moreover, the similarities and the differences between the behavior of light particles in isotropic and in stratified turbulence will be considered. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.GP.9

AB - The trajectories of small inertial particles with densities of $O(\rho_{f})$ in turbulent flows can be computed using the Maxey-Riley equation. By means of direct numerical simulations we study the dispersion behavior of these light particles in statistically stationary stably stratified turbulence. The importance of the different forces that are acting on the particles is examined. It strongly depends on the density ratio. For $\rho_{p}/\rho_{f}=O(1)$ most forces are of the same order of magnitude. With increasing density ratio the relative importance of the different forces with respect to the Stokes drag decreases. For $\rho_{p}/\rho_{f}=O(10)$ mainly the Stokes drag, gravity, the pressure gradient and the Basset force remain relevant. Furthermore, the effect of the different forces on the dispersion and preferential concentration behavior of light particles will be discussed. The results are compared with those obtained for heavy particles. The results for light and heavy particles show a strong resemblance when the Stokes number is used as the parameter to express the particle properties. Moreover, the similarities and the differences between the behavior of light particles in isotropic and in stratified turbulence will be considered. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DFD.GP.9

M3 - Conference contribution

BT - Proceedings of the 61st Annual Meeting of the APS Division of Fluid Dynamics, San Antonio, Texas, USA, 23-25 November, 2008

CY - San Antonio, USA

T2 - 61st Annual Meeting of the APS Division of Fluid Dynamics (DFD08), November 23-25, 2008, San Antonio, TX, USA

Y2 - 23 November 2008 through 25 November 2008

ER -

Light particle dispersion in stably stratified turbulence

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