Citation
Van Putten, Maurice H. P. M. (1992) MHD in divergence form : a computational method for astrophysical flow. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/263j-a556. https://resolver.caltech.edu/CaltechETD:etd-08152007-144037
Abstract
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The equations of MHD in curved space-time are presented in divergence form for the purpose of numerical implementation. This result follows from a covariant divergence form of the single fluid theory of electro-magneto-hydrodynamics in curved space-time with general constitutive relations. Some one- and two-dimensional shock computations are given. A pseudospectral method with weak smoothing is used in all of our computations. The pseudo-spectral method is constructed by consideration of Riemann problems in one dimension. The power of MHD in divergence form is brought about by using uniform grid-spacing and explicit time-stepping. The problems considered are shock-tube problems in transverse MHD with analytical comparison solution and a coplanar Riemann problem as discussed for nonrelativistic MHD in Brio and Wu [37]. In a limit of nonrelativistic velocities comparison is made of the results of the latter with those in [37]. In two dimensions cylindrically symmetric problems are considered for test of isotropy, independence of coordinate system and convergence (using comparison results in polar coordinates). We conclude with a computation of a shock induced vortex in jet flow with [...] 2.35, a relativistic jet computation with [...] 3.25 and, finally, computations on magnetic pressure dominated stagnation points in a 2D shock problem in nontransverse MHD. This work is proposed for numerical study of astrophysical flows, and in particular as a "vehicle" towards the origin of jets.
Item Type: | Thesis (Dissertation (Ph.D.)) |
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Subject Keywords: | Applied and Computational Mathematics |
Degree Grantor: | California Institute of Technology |
Division: | Engineering and Applied Science |
Major Option: | Applied And Computational Mathematics |
Thesis Availability: | Public (worldwide access) |
Research Advisor(s): |
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Group: | TAPIR, Astronomy Department |
Thesis Committee: |
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Defense Date: | 18 May 1992 |
Record Number: | CaltechETD:etd-08152007-144037 |
Persistent URL: | https://resolver.caltech.edu/CaltechETD:etd-08152007-144037 |
DOI: | 10.7907/263j-a556 |
Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
ID Code: | 3139 |
Collection: | CaltechTHESIS |
Deposited By: | Imported from ETD-db |
Deposited On: | 23 Aug 2007 |
Last Modified: | 16 Apr 2021 23:23 |
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