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Reduction of mean-square advection in turbulent passive scalar mixing
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10.1063/1.4731302
/content/aip/journal/pof2/24/7/10.1063/1.4731302
http://aip.metastore.ingenta.com/content/aip/journal/pof2/24/7/10.1063/1.4731302
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

DNS and theoretical results for the scalar spectra in isotropic turbulence at a Taylor-scale Reynolds number of 427 and . In the inset the energy spectra are shown.

Image of FIG. 2.
FIG. 2.

DNS and theoretical results in isotropic turbulence at a Taylor-scale Reynolds number of 427 and . Left: Spectrum of the mean square advection term of the scalar equation in isotropic turbulence. Also shown are the Gaussian spectra (thin lines). Right: Ratio of the spectra to the Gaussian spectra.

Image of FIG. 3.
FIG. 3.

Closure results for the spectrum of the scalar variance at a Taylor-scale Reynolds number of 427 and . Inset: Energy spectrum.

Image of FIG. 4.
FIG. 4.

Closure results for the spectrum of the mean square advection term at a Taylor-scale Reynolds number of 427 and . Also shown are the Gaussian spectra (thin lines). Right: Ratio of the spectra to the Gaussian spectra.

Image of FIG. 5.
FIG. 5.

The mean square advection term of the scalar equation in isotropic turbulence compared to its Gaussian value as a function of the Prandtl number at a Taylor-scale Reynolds number of 427.

Image of FIG. 6.
FIG. 6.

Left, top: Velocity Beltramization and bottom: depression of nonlinearity through alignment of the Lamb-vector and the wavevector. Right: Depletion of advection in physical and Fourier space. The scalar flux vector is defined as .

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/content/aip/journal/pof2/24/7/10.1063/1.4731302
2012-07-02
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reduction of mean-square advection in turbulent passive scalar mixing
http://aip.metastore.ingenta.com/content/aip/journal/pof2/24/7/10.1063/1.4731302
10.1063/1.4731302
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