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- W2054111572 abstract "We have developed a physical theory for the finding that the most intense laboratory vortex occurs when it is in the form of an end-wall vortex. We argue that the end-wall vortex allows no standing centrifugal waves (i.e., it is supercritical), and therefore, disturbances cannot propagate down from aloft. This allows the low central pressure of the end-wall vortex at the level of maximum azimuthal velocity to be balanced by a central axial jet which jet which accelerates from the lower end wall to this level. This supercritical, end-wall vortex undergoes a transition to a subcritical vortex aloft through a vortex breakdown. We construct a model for the maximum intensity of these vortices by developing a model for the end-wall vortex and by finding the criterion for a vortex breakdown to be in steady suspension above the lower end wall. The model agrees well with previous experimental simulations of tornado-like vortices in the Purdue tornado vortex chamber a steady end-wall vortex adjacent to the lower boundary can have a maximum azimuthal velocity approximately 1.7× the maximum azimuthal velocity in the subcritical vortex aloft. We believe the model offers a way to reconcile the maximum observed tornado windspeeds with hydrostatic (subcritical) tornado models, which, by themselves, are inadequate to explain the highest windspeeds associated with tornadoes." @default.
- W2054111572 created "2016-06-24" @default.
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- W2054111572 date "1986-11-01" @default.
- W2054111572 modified "2023-10-17" @default.
- W2054111572 title "A Theory for the Maximum Windspeeds in Tornado-like Vortices" @default.
- W2054111572 doi "https://doi.org/10.1175/1520-0469(1986)043<2328:atotmw>2.0.co;2" @default.
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