2001
DOI: 10.1017/s0022112000003207
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Dynamics of scalar dissipation in isotropic turbulence: a numerical and modelling study

Abstract: The physical mechanisms underlying the dynamics of the dissipation of passive scalar fluctuations with a uniform mean gradient in stationary isotropic turbulence are studied using data from direct numerical simulations (DNS), at grid resolutions up to 512 3 . The ensemble-averaged Taylor-scale Reynolds number is up to about 240 and the Schmidt number is from ⅛ to 1. Special attention is given to statistics conditioned upon the energy dissipation rate because of their important role in the Lagrangian spectral r… Show more

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Cited by 101 publications
(119 citation statements)
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“…The scalar gradient vector aligns with the compressive strain-rate eigenvector but is normal to the other two eigenvectors. This is not the universal alignment behavior reported in the previous studies [1,17,21]. Note that at the same locations the alignment behavior of vorticity was also found by Paul et al [37] C. The combined effects of strain-rate eigenvalues and eigenvectors to scalar gradient production…”
Section: B the Role Of Geometrical Alignments In Scalar Gradient Prosupporting
confidence: 47%
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“…The scalar gradient vector aligns with the compressive strain-rate eigenvector but is normal to the other two eigenvectors. This is not the universal alignment behavior reported in the previous studies [1,17,21]. Note that at the same locations the alignment behavior of vorticity was also found by Paul et al [37] C. The combined effects of strain-rate eigenvalues and eigenvectors to scalar gradient production…”
Section: B the Role Of Geometrical Alignments In Scalar Gradient Prosupporting
confidence: 47%
“…The analysis is carried out at two stations along the grid-element centerline: (i) at x/x * = 0.25 located in the near-gridelement region (figures 9a-9c) and (ii) at x/x * = 0.95 located in the far-downstream decay x/x * =0.35, (c) x/x * =0.5. The dotted lines in (c) are the results from Vedula et al [21].…”
Section: Eigen-contributions Of Strain-rate To the Scalar Gradi-enmentioning
confidence: 96%
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“…Þ , as turbulent straining acts to generate scalar gradient (Vedula et al, 2001), which in turn increases the rate of micro-mixing. This is consistent with high decay rate of ϕ 0 for high values of u 0 =S b ϕ¼1 ð Þ (see Figure 5).…”
Section: Gaussian Distribution Case Gt4yd Bimodal Distribution Case Bmentioning
confidence: 99%
“…the symmetric part of the tensor A ij . Fluid particle acceleration is another important kind of velocity derivatives (see Vedula & Yeung 1999;Tsinober, Vedula & Yeung 2001;Vedula, Yeung & Fox 2001;Mordant et al 2003Mordant et al , 2004aCrawford, Mordant & Bodenschatz 2005, and references therein).…”
Section: Introductionmentioning
confidence: 99%