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- Bart van der Holst, Rony Keppens
- J. Comput. Physics
- 2007

- Rony Keppens
- 2004

Obtainable computational efficiency is evaluated when using an Adaptive Mesh Refinement (AMR) strategy in time accurate simulations governed by sets of conservation laws. For a variety of 1D, 2D, and 3D hydroand magnetohydrodynamic simulations, AMR is used in combination with several shock-capturing, conservative discretization schemes. Solution accuracy… (More)

- Rony Keppens, Zakaria Meliani, A. J. van Marle, P. Delmont, A. Vlasis, Bart van der Holst
- J. Comput. Physics
- 2012

- E. van der Swaluw, Abraham Achterberg, Yves A. Gallant, Thomas P. Downes, Rony Keppens
- 2002

Hydrodynamical simulations are presented of a pulsar wind emitted by a supersonically moving pulsar. The pulsar moves through the interstellar medium or, in the more interesting case, through the supernova remnant created at its birth event. In both cases there exists a three-fold structure consisting of the wind termination shock, contact discontinuity and… (More)

We formulate general guidelines to extend an explicit code with a great variety of implicit and semi-implicit time integration schemes. The discussion is based on their speci c implementation in the Versatile Advection Code, which is a general purpose software package for solving systems of non-linear hyperbolic (and/or parabolic) partial di erential… (More)

An adaptive grid technique for use in the solution of multi-dimensional time-dependent PDEs is applied to several magnetohydrodynamic model problems. The technique employs the method-of-lines and can be viewed both in a continuous and semi-discrete setting. By using an equidis-tribution principle, it has the ability to track individual features of the… (More)

- Rony Keppens, Gábor Tóth
- International Conference on Computational Science
- 2002

The ideal MagnetoHydroDynamic (MHD) equations accurately describe the macroscopic dynamics of a perfectly conducting plasma. Adopting a continuum, single fluid description in terms of the plasma density ρ, velocity v, thermal pressure p and magnetic field B, the ideal MHD system expresses conservation of mass, momentum, energy, and magnetic flux. This… (More)

- Fabien Casse, Rony Keppens
- 2003

We present magnetohydrodynamic simulations of a resistive accretion disk continuously launching transmagnetosonic, collimated jets. We time-evolve the full set of magnetohydrodynamic equations, but neglect radiative losses in the energetics (radiatively inefficient). Our calculations demonstrate that a jet is self-consistently produced by the interaction of… (More)

- Rony Keppens, G . T ÓTH, Ramona Westermann, J. P. Goedbloed
- 1999

By RONY KEPPENS1 , G. T ÓTH2 , R.H.J. WESTERMANN3 , AND J.P. GOEDBLOED1 FOM-Institute for Plasma-Physics Rijnhuizen, P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands, keppens@rijnh.nl goedbloed@rijnh.nl Department of Atomic Physics, Eötvös University, Puskin u. 5-7, Budapest 1088, Hungary, gtoth@hercules.elte.hu Astronomical Institute, Utrecht University,… (More)