Phys. Rev. E 61, R6075–R6078 (2000)

Large-scale coherent rotation and oscillation in turbulent thermal convection

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X.-L. Qiu, S. H. Yao, and P. Tong^*
Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078

Received 6 April 2000; published in the issue dated June 2000

Laser Doppler velocimetry is used to measure the velocity profile of turbulent thermal convection in an aspect-ratio-one cell filled with water. Velocity fluctuations are found to be homogeneous and isotropic in the turbulent bulk region. Despite the large velocity fluctuations, the mean flow field maintains a large-scale structure, which rotates and oscillates in a coherent manner. The experiment suggests a unique driving mechanism for the large-scale coherent rotation and oscillation in turbulent convection.

URL:

http://link.aps.org/doi/10.1103/PhysRevE.61.R6075

DOI:

10.1103/PhysRevE.61.R6075

PACS:

47.27.-i, 47.27.Te, 44.25.+f

^*Email address: ptong@okstate.edu

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Phys. Rev. E 61, R6075–R6078 (2000)

Large-scale coherent rotation and oscillation in turbulent thermal convection