The velocity field induced by a helical vortex tube

Energy Spectrum of the Random Velocity Field Induced by a Gaussian Vortex Tangle in HeII

Using the Gaussian model of the vortex tangle (VT) arising in the turbulent superfluid HeII, we calculate the energy spectrum E(k) of the 3D random velocity field induced by that VT. If the VT is assumed to be a purely fractal object with Haussdorf dimension HD, the E(k) is a power-like function E(k) ∝ k−2+HD . A more realistic VT in HeII is a semi-fractal object, behaving as smooth line for sm...

Interaction of a pulsating vortex rope with the local velocity field in a Francis turbine draft tube

Acoustic resonances in Francis turbines often define undesirable limitations to their operating ranges at high load. The knowledge of the mechanisms governing the onset and the sustenance of these instabilities in the swirling flow leaving the runner is essential for the development of a reliable hydroacoustic model for the prediction of system stability. The present work seeks to study experim...

The Nuclear Velocity Field with and without the Vortex Spin

We a r e i n t e r e s t e d i n t h e e x t r a c t i o n of t h e c o l l e c t i v e q u a n t i t i e s , such as t h e c o l l e c t i v e v e l o c i t y f i e l d , o u t o f t h e many p a r t i c l e t h e o r y through some c o o r d i n a t e t r a n s f o r m a t i o n f o r t h e system of A-1 : n Jacobi v e c t o r s such t h a t t h e c o l l e c t i v e c o o r d i n a t e s bel...

Regularity of the velocity field for Euler vortex patch evolution

a double vortex tube and experimental comparison with conventional vortex tube

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