On the role of vorticity in the microstructure of a passive scalar field

Analysis of experimental and modeling results on second-order moments of temperature derivatives downstream of a heated line source suggests a prevailing effect of vorticity in the destruction of anisotropy at this level. The influence of vorticity on small-scale anisotropy is also confirmed in the...

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Bibliographic Details
Published in:Physics of fluids (1994) 2004-01, Vol.16 (1), p.219-221
Main Authors: Gonzalez, M., Paranthoën, P.
Format: Article
Language:English
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Summary:Analysis of experimental and modeling results on second-order moments of temperature derivatives downstream of a heated line source suggests a prevailing effect of vorticity in the destruction of anisotropy at this level. The influence of vorticity on small-scale anisotropy is also confirmed in the quite different case of a forced passive scalar in isotropic turbulence; assuming that vorticity promotes reorientation of large instantaneous scalar gradients through rotation of scalar fronts enables us to explain the trend of the scalar gradient skewness with increasing Schmidt number which is observed in recent numerical simulations.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.1630795