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Turbulent mixing of passive scalars ...

Xu, Shuyi.

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Turbulent mixing of passive scalars at high Schmidt number.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Turbulent mixing of passive scalars at high Schmidt number./
Author:	Xu, Shuyi.
Description:	163 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1565.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3170124
ISBN:	0542063190

Turbulent mixing of passive scalars at high Schmidt number.
Xu, Shuyi.

Turbulent mixing of passive scalars at high Schmidt number. - 163 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1565.

Thesis (Ph.D.)--Georgia Institute of Technology, 2005.

A numerical study of fundamental aspects of turbulent mixing has been performed, with emphasis on the behavior of passive scalars of low molecular diffusivity (high Schmidt number Sc). Direct Numerical Simulation is used to simulate incompressible, stationary and isotropic turbulence carried out at high grid resolution. Data analyses are carried out by separate parallel codes using up to 10243 grid points for Taylor-scale Reynolds number (Rlambda) up to 390 and Sc up to 1024. Schmidt number of order 1000 is simulated using a double-precision parallel code in a turbulent flow at a low Reynolds number of Rlambda ≈ 8 to reduce computational cost to achievable level. The results on the scalar spectrum at high Schmidt numbers appear to have a k-1 scaling range. In the presence of a uniform mean scalar gradient, statistics of scalar gradients are observed to deviate substantially from Kolmogorov's hypothesis of local isotropy, with a skewness factor remaining at order unity as the Reynolds number increases. However, this skewness decreases with Schmidt number suggesting that local isotropy for scalars at high Schmidt number is a better approximation. Intermittency exponents manifested by three types of two-point statistics of energy and scalar dissipation, i.e., the two-point correlator &lang; c (x) c (x + r)&rang;, the second-order moment of local scalar dissipation &lang; c2r &rang; and the variance of the logarithmic local scalar dissipation s2lnc r are discussed. Several basic issues in differential diffusion between two scalars of different molecular diffusivities transported by the same turbulent flow, the physical process of scalar spectral transfer and subgrid-scale transfer are also briefly addressed.

ISBN: 0542063190Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Turbulent mixing of passive scalars at high Schmidt number.
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100 1 $a Xu, Shuyi. $3 1905387
245 1 0 $a Turbulent mixing of passive scalars at high Schmidt number.
300 $a 163 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1565.
500 $a Director: P. K. Yeung.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2005.
520 $a A numerical study of fundamental aspects of turbulent mixing has been performed, with emphasis on the behavior of passive scalars of low molecular diffusivity (high Schmidt number Sc). Direct Numerical Simulation is used to simulate incompressible, stationary and isotropic turbulence carried out at high grid resolution. Data analyses are carried out by separate parallel codes using up to 10243 grid points for Taylor-scale Reynolds number (Rlambda) up to 390 and Sc up to 1024. Schmidt number of order 1000 is simulated using a double-precision parallel code in a turbulent flow at a low Reynolds number of Rlambda ≈ 8 to reduce computational cost to achievable level. The results on the scalar spectrum at high Schmidt numbers appear to have a k-1 scaling range. In the presence of a uniform mean scalar gradient, statistics of scalar gradients are observed to deviate substantially from Kolmogorov's hypothesis of local isotropy, with a skewness factor remaining at order unity as the Reynolds number increases. However, this skewness decreases with Schmidt number suggesting that local isotropy for scalars at high Schmidt number is a better approximation. Intermittency exponents manifested by three types of two-point statistics of energy and scalar dissipation, i.e., the two-point correlator &lang; c (x) c (x + r)&rang;, the second-order moment of local scalar dissipation &lang; c2r &rang; and the variance of the logarithmic local scalar dissipation s2lnc r are discussed. Several basic issues in differential diffusion between two scalars of different molecular diffusivities transported by the same turbulent flow, the physical process of scalar spectral transfer and subgrid-scale transfer are also briefly addressed.
590 $a School code: 0078.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0538
690 $a 0759
690 $a 0548
710 2 0 $a Georgia Institute of Technology. $3 696730
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Yeung, P. K., $e advisor
790 $a 0078
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3170124