A bicharacteristic formulation of the ideal MHD equations
Data(s) |
01/04/2011
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Resumo |
On a characteristic surface Omega of a hyperbolic system of first-order equations in multi-dimensions (x, t), there exits a compatibility condition which is in the form of a transport equation along a bicharacteristic on Omega. This result can be interpreted also as a transport equation along rays of the wavefront Omega(t) in x-space associated with Omega. For a system of quasi-linear equations, the ray equations (which has two distinct parts) and the transport equation form a coupled system of underdetermined equations. As an example of this bicharacteristic formulation, we consider two-dimensional unsteady flow of an ideal magnetohydrodynamics gas with a plane aligned magnetic field. For any mode of propagation in this two-dimensional flow, there are three ray equations: two for the spatial coordinates x and y and one for the ray diffraction. In spite of little longer calculations, the final four equations (three ray equations and one transport equation) for the fast magneto-acoustic wave are simple and elegant and cannot be derived in these simple forms by use of a computer program like REDUCE. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/36003/1/jpp_2011_72_169.pdf.pdf Gupta, Hari Shanker and Prasad, Phoolan (2011) A bicharacteristic formulation of the ideal MHD equations. In: Journal of Plasma Physics, 77 (Part 2). pp. 169-191. |
Publicador |
Cambridge University Press |
Relação |
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8027306 http://eprints.iisc.ernet.in/36003/ |
Palavras-Chave | #Mathematics |
Tipo |
Journal Article PeerReviewed |