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Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
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Boundary Zonal Flow in Rotating Turbulent Rayleigh-Bénard Convection
Xuan Zhang1, Dennis P M van Gils1,2, Susanne Horn1,3,4
1Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany.
Physical Review Letters
|March 14, 2020
Summary
Rapidly rotating turbulent convection generates a boundary zonal flow (BZF), replacing large-scale circulation. This flow enhances heat transport near the cell wall, exhibiting unique temperature wave patterns.
Area of Science:
- Fluid dynamics
- Heat transfer
- Turbulence
Background:
- Classical Rayleigh-Bénard convection typically exhibits large-scale circulation.
- Rapid rotation in slender cylindrical cells alters convection dynamics.
Purpose of the Study:
- Investigate the flow structures in rapidly rotating turbulent Rayleigh-Bénard convection.
- Characterize the heat transport mechanisms near the boundary.
Main Methods:
- Experimental investigation
- Direct numerical simulations
Main Results:
- A boundary zonal flow (BZF) replaces classical large-scale circulation.
- BZF enhances heat transport near the vertical side wall.
- Temperature exhibits an anticyclonic traveling wave of mode one.
Conclusions:
- BZF is a key feature of rapidly rotating turbulent convection.
- The BZF width scales with Ra^{1/4}Ek^{2/3}.
- Rotation rate influences the Ekman number and flow behavior.
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