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pro vyhledávání: '"H. K. Moffatt"'
Autor:
H. K. Moffatt
Publikováno v:
Journal of Fluid Mechanics. 914
An informal introduction is provided to a range of topics in fluid dynamics having a topological character. These topics include flows with boundary singularities, Lagrangian chaos, frozen-in fields, magnetohydrodynamic analogies, fast- and slow-dyna
Autor:
H. K. Moffatt
Publikováno v:
Journal of Fluid Mechanics. 914
Extreme events in turbulent flow are associated with intense stretching of concentrated vortices, intermittent in both space and time. The occurrence of such events has been investigated in a turbulent flow driven by counter-rotating propellors (Debu
The behaviour of a viscous drop squeezed between two horizontal planes is treated by both theory and experiment. When the squeezing force F is constant and surface tension is neglected, the theory predicts ultimate growth of the radius a~ t^{1/8}, in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3a6a04e3843fd30af57ede4e5329086
Autor:
H. K. Moffatt, Yoshifumi Kimura
Publikováno v:
Journal of Fluid Mechanics. 887
Autor:
Krzysztof A. Mizerski, H. K. Moffatt
Publikováno v:
Geophysical & Astrophysical Fluid Dynamics. 112:165-174
Random waves in a uniformly rotating plasma in the presence of a locally uniform seed magnetic field and subject to weak kinematic viscosity ν and resistivity η are considered. These “Lehnert” waves may have either positive or negative helicity
Publikováno v:
Proceedings of the National Academy of Sciences. 114:12858-12863
Equations describing the rolling of a spherical ball on a horizontal surface are obtained, the motion being activated by an internal rotor driven by a battery mechanism. The rotor is modeled as a point mass mounted inside a spherical shell and caused
Autor:
H. K. Moffatt, Yoshifumi Kimura
The evolution towards a finite-time singularity of the Navier–Stokes equations for flow of an incompressible fluid of kinematic viscosity$\unicode[STIX]{x1D708}$is studied, starting from a finite-energy configuration of two vortex rings of circulat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99eb0714db5117b26259bef9777d755e
https://www.repository.cam.ac.uk/handle/1810/295280
https://www.repository.cam.ac.uk/handle/1810/295280
Autor:
H. K. Moffatt, Yoshifumi Kimura
In Part 1 of this work, we have derived a dynamical system describing the approach to a finite-time singularity of the Navier-Stokes equations. We now supplement this system with an equation describing the process of vortex reconnection at the apex o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::549a7b84cb4e50c050f8a88135d0f6b7
Autor:
H. K. Moffatt
Singularities of the Navier-Stokes equations occur when some derivative of the velocity field is infinite at any point of a field of flow (or, in an evolving flow, becomes infinite at any point within a finite time). Such singularities can be mathema
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bdce43bf863f342c40a6c32472aedc5
Autor:
Yoshifumi Kimura, H. K. Moffatt
Publikováno v:
Journal of Fluid Mechanics. 834
Vortex reconnection under Biot–Savart evolution is investigated geometrically and numerically using a tent model consisting of vortex filaments initially in the form of two tilted hyperbolic branches; the vortices are antiparallel at their points o