000014750 001__ 14750
000014750 005__ 20161115100201.0
000014750 04107 $$aeng
000014750 046__ $$k2016-08-21
000014750 100__ $$aOkino, Shinya
000014750 24500 $$aSpectral analyses of high Prandtl number stratified turbulence

000014750 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014750 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014750 506__ $$arestricted
000014750 520__ $$2eng$$aSpectra of decaying turbulence in a stratified fluid containing either an active (density stratifying) or a passive high Prandtl number scalar are investigated by direct numerical simulations. When the fluid is stratified by a low-Prandtl-number active scalar (P rT = 1) and simultaneouly contains a high-Prandtl-number passive scalar (P rS = 25), spectrum of the high-Prandtl-number passive scalar variance obeys the usual Batchelor scaling. On the other hand, when the fluid is stratified by a high-Prandtl-number active scalar (P rT = 25), horizontal spectrum of that active scalar (or potential energy) decreases rapidly at high wavenumbers to approach the kinetic energy spectrum, indicating the deviation from the Batchelor scaling. Examination of the spectral budget shows that the deviation is due to the persistent conversion from the potential energy to the kinetic energy at small scales.

000014750 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014750 653__ $$a

000014750 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014750 720__ $$aOkino, Shinya
000014750 8560_ $$ffischerc@itam.cas.cz
000014750 8564_ $$s106757$$uhttps://invenio.itam.cas.cz/record/14750/files/TS.FM14-6.01.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1453, code TS.FM14-6.01
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000014750 962__ $$r13812
000014750 980__ $$aPAPER