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- W3100248940 abstract "By employing the equations of mean-square vorticity (enstrophy) fluctuations in strong shear flows, we demonstrate that, unlike energy production of turbulent vorticity in nonrotating shear flows, the turbulent vorticity of weak convection in Keplerian disks cannot gain energy from vortex stretching/tilting by background shear unless the associated Reynolds stresses are negative. This is because the epicyclic motion is an energy sink of the radial component of mean-square turbulent vorticity in Keplerian disks when Reynolds stresses are positive. Consequently, weak convection cannot be self-sustained in Keplerian flows. This agrees with the results implied from the equations of mean-square velocity fluctuations in strong shear flows. Our analysis also sheds light on the explanation of the simulation result in which positive kinetic helicity is produced by the Balbus-Hawley instability in a vertically stratified Keplerian disk. We also comment on the possibility of outward angular momentum transport by strong convection based on azimuthal pressure perturbations and directions of energy cascade." @default.
- W3100248940 created "2020-11-23" @default.
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- W3100248940 date "2000-09-01" @default.
- W3100248940 modified "2023-10-03" @default.
- W3100248940 title "Vorticity Budget of Weak Thermal Convection in Keplerian Disks" @default.
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- W3100248940 doi "https://doi.org/10.1086/309328" @default.
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