Enhanced azimuthal rotation of the large-scale flow through stochastic cessations in turbulent rotating convection with large Rossby numbers
نویسندگان
چکیده
منابع مشابه
Rare fluctuations and large-scale circulation cessations in turbulent convection.
In turbulent Rayleigh-Bénard convection, a large-scale circulation (LSC) develops in a nearly vertical plane and is maintained by rising and falling plumes detaching from the unstable thermal boundary layers. Rare but large fluctuations in the LSC amplitude can lead to extinction of the LSC (a cessation event), followed by the reemergence of another LSC with a different (random) azimuthal orien...
متن کاملEffect of weak rotation on large-scale circulation cessations in turbulent convection.
We investigate the effect of weak rotation on the large-scale circulation (LSC) of turbulent Rayleigh-Bénard convection, using the theory for cessations in a low-dimensional stochastic model of the flow previously studied. We determine the cessation frequency of the LSC as a function of rotation, and calculate the statistics of the amplitude and azimuthal velocity fluctuations of the LSC as a f...
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We present a broad range of measurements of the angular orientation θ0(t) of the large-scale circulation (LSC) of turbulent Rayleigh-Bénard convection as a function of time. We used two cylindrical samples of different overall sizes, but each with its diameter nearly equal to its height. The fluid was water with a Prandtl number of 4.38. The time series θ0(t) consisted of meanderings similar to...
متن کاملRotations and cessations of the large-scale circulation in turbulent Rayleigh-Bénard convection
We present a broad range of measurements of the angular orientation θ0(t) of the largescale circulation (LSC) of turbulent Rayleigh-Bénard convection as a function of time. We used two cylindrical samples of different overall sizes, but each with its diameter nearly equal to its height. The fluid was water with a Prandtl number of 4.38. The time series θ0(t) consisted of meanderings similar to ...
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Paul B. J. Hoefnagels,1,2 Ping Wei,3 Daniela Narezo Guzman,1,2 Chao Sun,1,4 Detlef Lohse,1,5 and Guenter Ahlers2 1Physics of Fluids Group, Department of Science and Technology, J.M. Burgers Center for Fluid Dynamics, Mesa+-Institute, and Max Planck Center Twente, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands 2Department of Physics, University of California, Santa Barbara...
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ژورنال
عنوان ژورنال: Physical Review Fluids
سال: 2017
ISSN: 2469-990X
DOI: 10.1103/physrevfluids.2.044602