Govindarajan, Rama (2002) Universal behavior of entrainment due to coherent structures in turbulent shear flow Physical Review Letters, 88 (13). 134503_1-134503_4. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v88/i13/e134503
Related URL: http://dx.doi.org/10.1103/PhysRevLett.88.134503
Abstract
A solution is suggested for a persistent mystery in the physics of turbulent flows: cumulus clouds rise to towering heights, practically without entraining the ambient medium, while apparently similar turbulent jets quickly lose their identity through entrainment and mixing. Dynamical system computations on a model vortical flow show that entrainment due to coherent structures depends sensitively on relative speeds of fluid parcels. Local heating, for example, can alter drastically the sizes of Kolmogorov-Arnol'd-Moser tori and chaotic mixing regions. The entrainment rate and, hence, the lifetime of a turbulent shear flow show a universal, nonmonotone dependence on the heating.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 62415 |
Deposited On: | 22 Sep 2011 03:22 |
Last Modified: | 22 Sep 2011 03:22 |
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