Výsledky vyhledávání - "J. U. Brackbill"

Akademický článek

3D reconnection due to oblique modes: a simulation of Harris current sheets

Autor: G. Lapenta, J. U. Brackbill

Publikováno v: Nonlinear Processes in Geophysics, Vol 7, Iss 3/4, Pp 151-158 (2000)

Simulations in three dimensions of a Harris current sheet with mass ratio, mi/me = 180, and current sheet thickness, pi/L = 0.5, suggest the existence of a linearly unstable oblique mode, which is independent from either the drift-kink or the tearing

Externí odkaz: https://doaj.org/article/161f0d2a9abe48569e410e55d2c450cf

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3D reconnection due to oblique modes: a simulation of Harris current sheets

Autor: Giovanni Lapenta, J. U. Brackbill

Publikováno v: Nonlinear Processes in Geophysics, Vol 7, Iss 3/4, Pp 151-158 (2000)
Nonlinear Processes in Geophysics
Nonlinear Processes in Geophysics, European Geosciences Union (EGU), 2000, 7 (3/4), pp.151-158
Scopus-Elsevier

International audience; Simulations in three dimensions of a Harris current sheet with mass ratio, mi/me = 180, and current sheet thickness, pi/L = 0.5, suggest the existence of a linearly unstable oblique mode, which is independent from either the d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c15170d6cbb6c9238e3e7b27ab615232
https://www.nonlin-processes-geophys.net/7/151/2000/

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Boundary conditions for Maxwell solvers

Autor: J. U. Brackbill

Publikováno v: Journal of Computational Physics. 227:6715-6719

which is solved in implicit plasma simulations. Compared with the standard Helmholtz equation [4, p68], (c∆t/2) replaces −(c/ω), and Eq. 1 is solved each time step (instead of for each value of ω) for E with S given. The source term, S, is neit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::90e4f1fd9dd522359a9ad4f104c2afd8
https://doi.org/10.1016/j.jcp.2008.03.046

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Particle methods

Autor: J. U. Brackbill

Publikováno v: International Journal for Numerical Methods in Fluids. 47:693-705

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::62a46ad4f3fe7daa7881ac003145592d
https://doi.org/10.1002/fld.912

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The unexpected role of the lower hybrid drift instability in magnetic reconnection in three dimensions

Autor: J. U. Brackbill, Giovanni Lapenta, William Daughton

Publikováno v: Physics of Plasmas. 10:1577-1587

The growth of the lower hybrid drift instability (LHDI) in unstable current sheets induces a fluid velocity shear that drives a Kelvin–Helmholtz instability (KHI). The KHI results in kinking of the current sheet, so that any subsequent magnetic rec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7bbc4628e63f3741403f334703eec75a
https://doi.org/10.1063/1.1560615

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An Implicit Particle-in-Cell Method for Granular Materials

Autor: Sharen J. Cummins, J. U. Brackbill

Publikováno v: Journal of Computational Physics. 180:506-548

An implicit-in-time method for granular materials is described. The method combines the material point method, a first-order contact algorithm, and a Newton-Krylov equation solver to give improved energy conservation, stabilization of the finite-grid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::71bf5ab1134df1cf40e8a6070ef0e434
https://doi.org/10.1006/jcph.2002.7101

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Nonlinear evolution of the lower hybrid drift instability: Current sheet thinning and kinking

Autor: Giovanni Lapenta, J. U. Brackbill

Publikováno v: Physics of Plasmas. 9:1544-1554

Through numerical plasma simulations using the implicit code CELESTE3D [G. Lapenta and J. U. Brackbill, Nonlinear Processes Geophys. 7, 151 (2000)], the development of kink modes in a Harris current sheet is investigated, and their possible nonlinear

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6d52779d1ea383911ebeef1e8db05607
https://doi.org/10.1063/1.1464149

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Dynamic stress bridging in granular material

Autor: J. U. Brackbill, S. G. Bardenhagen

Publikováno v: Journal of Applied Physics. 83:5732-5740

Through numerical experiments we investigate stress localization in granular material with application to plastic-bonded explosives. The results shed light on static versus dynamic loading, and on the role of an interstitial material between grains.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::173907b6c988fdbd021f96bf92bf3b38
https://doi.org/10.1063/1.367429

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A kinetic theory for the drift-kink instability

Autor: Giovanni Lapenta, J. U. Brackbill

Publikováno v: Journal of Geophysical Research: Space Physics. 102:27099-27108

We have developed a linear two-dimensional kinetic theory, which is motivated by recent results for the drift-kink instability. The theory predicts plasma instability for large values of ion-electron temperature ratios, Ti/Te, moderate drift speeds,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e11ec743952ba8325f01587225f41b97
https://doi.org/10.1029/97ja02140

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