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Selective decay of inviscid invariants is shown to be responsible for the concentration of vorticity as in the previous study. In the case of a vortex pair disturbed by localized disturbances concentration of vorticity occurs twice: the first concentration is not related to selective decay; however, the second weak concentration is most likely due to selective decay.
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It is important to understand the rule of entropy and temperature for the conservation of topological quantities. It will be shown that while cross helicity is not conserved for non-barotropic MHD a variant of this quantity is. The implications of this to non-barotropic MHD stability is discussed. We consider classical magnetic helicity a Gauss invariant of magnetic lines and higher helicity invariants as nonlinear constraints for dynamo action.
We argue that the Gauss invariant has several properties absent from higher helicity invariants which prevents use of the latter to constrain dynamo action. We consider other helicities hydrodynamic helicity and cross helicity in the context of the dynamo problem.
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We consider a magnetic field occupying the simply connected domain D and having all its field lines tied to the boundary S of D. We assume here that has a simple topology, i. We first present new formulae for the helicity H of relative to a reference field having the same normal component on S , and for its field line helicity h relative to a reference vector potential of. These formulae make immediately apparent the well known invariance of these quantities under all the ideal MHD deformations that preserve the positions of the footpoints on S.
They express indeed h and H either in terms of and , or in terms of the values on S of a pair of Euler potentials of. We next show that, for a specific choice of , the field line helicity h of fully characterizes the magnetic mapping and then the topology of the lines.
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Reconnection of a vortex filament under the Biot—Savart law is investigated numerically using a vortex ring twisted in the form of a figure-of-eight. For the numerical method, the vortex ring is divided into piecewise linear segments, and the Biot-Savart integral is approximated by a summation over the segments with a cut-off method to deal with the singular terms. It is demonstrated that the centre part of the skewed vortex 'chopsticks', where the interaction is maximal, tends to approach and accelerate to form a singularity while making a 'tent-like' structure as shown by de Waele and Aarts Phys.
The minimum separation of the chopsticks, the maximum velocity and the maximum axial strain rate show clear scaling exponents near the singularity consistent with Leray scaling for self-similar solutions of the Navier—Stokes equations. We study the Cauchy problem for a nonlinear system of Magnetohydrodynamics. The viscosity and conductivity are assumed to be small and the initial fields are assumed to jump rapidly near certain smooth 2D-surface in 3D-space.
We construct formal asymptotic solution for this Cauchy problem. We study the spatial structure and time behavior of the solution. In particular, we derive free boundary problem for the limit values of the magnetic field and the velocity field of the fluid.
This problem also governs the evolution of the surface of the jump. We derive equations on the moving surface, describing the evolution of the field profile. In particular, we prove that the effect of the instantaneous growth of the magnetic field takes place only for degenerate asymptotic modes.
We numerically investigate, within the context of helical symmetry, the dynamics of a regular array of two or three helical vortices with or without a straight central hub vortex. The Navier—Stokes equations are linearised to study the instabilities of such basic states. For vortices with low pitches, an unstable mode is extracted which corresponds to a displacement mode and growth rates are found to compare well with results valid for an infinite row of point vortices or an infinite alley of vortex rings.
For larger pitches, the system is stable with respect to helically symmetric perturbations. In the nonlinear regime, we follow the time-evolution of the above basic states when initially perturbed by the dominant instability mode. For two vortices, sequences of overtaking events, leapfrogging and eventually merging are observed.
The transition between such behaviours occurs at a critical ratio involving the core size and the vortex-separation distance. Cases with three helical vortices are also presented. We present the results of modelling the development of homogeneous and isotropic turbulence with a large-scale source of energy and a source of helicity distributed over scales. We use the shell model for numerical simulation of the turbulence at high Reynolds number.
The results show that the helicity injection leads to a significant change in the behavior of the energy and helicity spectra in scales larger and smaller than the energy injection scale. We suggest the phenomenology for direct turbulent cascades with the helicity effect, which reduces the efficiency of the spectral energy transfer.
Therefore the energy is accumulated and redistributed so that non-linear interactions will be sufficient to provide a constant energy flux.
Fluid Mechanics Streeter | Fluid Dynamics | Viscosity
It can be interpreted as the 'helical bottleneck effect' which, depending on the parameters of the injection helicity, reminds one of the well-known bottleneck effect at the end of inertial range. Simulations which included the infrared part of the spectrum show that the inverse cascade hardly develops under distributed helicity forcing. By considering steady magnetic fields in the shape of torus knots and unknots in ideal magnetohydrodynamics, we compute some fundamental geometric and physical properties to provide estimates for magnetic energy and helicity.
By making use of an appropriate parametrization, we show that knots with dominant toroidal coils that are a good model for solar coronal loops have negligible total torsion contribution to magnetic helicity while writhing number provides a good proxy. His research group addresses fundamental and applied problems in turbulent flows. The latter are primarily associated with automotive applications. He holds 7 patents involving fluid mechanics. Professor Yarin is an applied physicist working in the field of fluid mechanics.
His main contributions are related to the free surface flows jets, films, fibers, threads and droplets of Newtonian and rheologically complex liquids. He is an author of 2 monographs, 5 chapters in books and research articles. From the reviews: "Handbooks are reference works for daily use by two main groups of people: on the one hand by experienced scientists, and by engineers or physicists ….
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Related Handbook of Fluid Dynamics and Fluid Machinery. Vol 1: Fundamentals of Fluid Dynamics
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