Fourth-order accurate finite-volume CWENO scheme for astrophysical MHD problems
| Autor: | Oliver Henze, Prabal Singh Verma, Wolf-Christian Müller, Jean-Mathieu Teissier |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Polynomial Finite volume method 010308 nuclear & particles physics Astronomy and Astrophysics 01 natural sciences law.invention Machine epsilon Magnetic field Nonlinear system Space and Planetary Science law Robustness (computer science) 0103 physical sciences Applied mathematics Cartesian coordinate system Magnetohydrodynamics 010303 astronomy & astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 482:416-437 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/sty2641 |
| Popis: | In this work, a simple fourth-order accurate finite volume semi-discrete scheme is introduced to solve astrophysical magnetohydrodynamics (MHD) problems on Cartesian meshes. Hydrodynamic quantities like density, momentum and energy are discretised as volume averages. The magnetic field and electric field components are discretised as area and line averages respectively, so as to employ the constrained transport technique, which preserves the solenoidality of the magnetic field to machine precision. The present method makes use of a dimension-by-dimension approach employing a 1-D fourth-order accurate centrally weighted essentially non-oscillatory (1D-CWENO4) reconstruction polynomial. A fourth-order accurate, strong stability preserving (SSP) Runge-Kutta method is used to evolve the semi-discrete MHD equations in time. Higher-order accuracy of the scheme is confirmed in various linear and nonlinear multi-dimensional tests and the robustness of the method in avoiding unphysical numerical artifacts in the solution is demonstrated through several complex MHD problems. |
| Databáze: | OpenAIRE |
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