An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes
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An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes
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Author : Robert C. Costen
language : en
Publisher:
Release Date : 1970
An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes written by Robert C. Costen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Tornadoes categories.
A new equation is derived for the motion of vorticity in a general fluid, including the effects of viscosity, compressibility, nonhomogeneity, and nonconservative forces. The equation holds, in particular, for vortices which may not move with the fluid. A linearized form of this equation is applied to tornado cyclones and to the twin tornado of April 11, 1965, near Elkhart, Indiana. It is shown that the displacement of tornado cyclones to the right of the mean tropospheric winds may be accounted for by the upward efflux of fluid from the cyclone into the jet stream. Also, the retarded revolution rate of the twin tornado may be due in part to an attractive "buoyancy" force acting on the partially rarefied cores of the pair.
An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes
DOWNLOAD
Author : Robert C. Costen
language : en
Publisher:
Release Date : 1970
An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes written by Robert C. Costen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
The Equations Of Fluid Motion And Their Application To Vortex Motion
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Author : Samuel David Bleich
language : en
Publisher:
Release Date : 1902
The Equations Of Fluid Motion And Their Application To Vortex Motion written by Samuel David Bleich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1902 with categories.
Tornadolike Gravity Driven Vortex Model
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Author : Robert G. Deissler
language : en
Publisher:
Release Date : 1974
Tornadolike Gravity Driven Vortex Model written by Robert G. Deissler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Eddies categories.
Vortex Motion And Stability With Density Variation Buoyancy And Surface Tension
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Author : Ching Chang
language : en
Publisher:
Release Date : 2020
Vortex Motion And Stability With Density Variation Buoyancy And Surface Tension written by Ching Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The motion of buoyant vortices is studied using reduced-order models. For a vortex filament, i.e. a curve in three-dimensional space along which vorticity is concentrated as a delta function, the evolution of the filament is calculated using a desingularized Biot-Savart integral. Buoyancy is added using a momentum balance argument while surface tension is also included. A set of equations that couples the transverse motion of the buoyant vortex filament and the axial flow within its core is derived. The new model is verified in an asymptotic limit by comparing it to the previous analytical solution for a thin vortex ring. In another approximation, axisymmetric contour dynamics is implemented to model a buoyant vortex ring of deforming core. A vortex patch is enclosed by a vortex sheet which emerges from baroclinic generation of vorticity. The evolution of the vortex sheet strength is derived from the Euler equation, and represents the effects of density, buoyancy and surface tension on the axisymmetric vortex ring. Numerical calculations for the integro-differential equations are carried out until the curvature singularity of vortex sheet evolution leads to a blowup. Finally, a linear stability analysis is performed for vortices in the presences of density and surface tension. The basic state solution is given as a perturbation series in a small parameter representing curvature of the vortex or a weak strain acting on it. With the small parameter in the basic state, instabilities are triggered by the resonances between two neutrally stable Kelvin waves for the unperturbed vortex. Those parametric instabilities are the curvature instability and the Moore-Saffman-Tsai-Widnall instability, corresponding to the parameter being curvature or a strain. The effects of density and surface tension on these instabilities are studied by calculating the growth rate and the instability bandwidth in various wavenumber regimes.
An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes
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Author : Robert C. Costen
language : en
Publisher:
Release Date : 1970
An Equation For Vortex Motion Including Effects Of Buoyancy And Sources With Applications To Tornadoes written by Robert C. Costen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Winds categories.
A new equation is derived for the motion of vorticity in a general fluid, including the effects of viscosity, compressibility, nonhomogeneity, and nonconservative forces. The equation holds, in particular, for vortices which may not move with the fluid. A linearized form of this equation is applied to tornado cyclones and to the twin tornado of April 11, 1965, near Elkhart, Indiana. It is shown that the displacement of tornado cyclones to the right of the mean tropospheric winds may be accounted for by the upward efflux of fluid from the cyclone into the jet stream. Also, the retarded revolution rate of the twin tornado may be due in part to an attractive "buoyancy" force acting on the partially rarefied cores of the pair.
Nasa Technical Note
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Author :
language : en
Publisher:
Release Date : 1971
Nasa Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
Nureg Cr
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Author : U.S. Nuclear Regulatory Commission
language : en
Publisher:
Release Date : 1980
Nureg Cr written by U.S. Nuclear Regulatory Commission and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Nuclear energy categories.
Selected Water Resources Abstracts
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Author :
language : en
Publisher:
Release Date : 1971
Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Hydrology categories.
A Search For Residual Magnetism Along A Tornado Path
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Author : Robert C. Costen
language : en
Publisher:
Release Date : 1971
A Search For Residual Magnetism Along A Tornado Path written by Robert C. Costen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Magnetic fields categories.
A search for residual magnetism was made along the damage path of a strong tornado that passed through a residential section of Hazlehurst, Mississippi, on January 23, 1969. Over 3000 gauss-meter readings were taken on nailheads in 24 frame buildings at various points on both sides of the damage path, but no evidence of residual magnetism attributable to the tornado was found. A statistical analysis of the data from seven of the buildings showed that an upper bound on possible axial dc electric current in the tornado was 3900 amperes at touchdown and 6100 amperes during its most intense phase. Residual magnetism measurements also indicated that transient electric currents of about 135 and 300 amperes had occurred in ground wires connected to the electric-meter boxes on two buildings. This finding suggests that residual-magnetism measurements on nails may be useful for detecting possible magnetic fields from ball lightning and other sporadic electrical phenomena, since no prior instrumentation is required.