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Time-Adaptive PIROCK Method with Error Control for Multi-Fluid and Single-Fluid MHD Systems by Wargnier, Q. M.; Vilmart, G.; Martínez-Sykora, J.; Hansteen, V. H.; De Pontieu, B. is a scholarly article available to read on EtoBox.

What is Time-Adaptive PIROCK Method with Error Control for Multi-Fluid and Single-Fluid MHD Systems about?

The solar atmosphere is a complex environment with diverse species and varying ionization states, especially in the chromosphere, where significant ionization variations occur. This region transitions from highly collisional to weakly collisional states, leading to complex plasma state transitions influenced by magnetic strengths and collisional properties. These processes introduce numerical stiffness in multi-fluid models, imposing severe timestep restrictions on standard time integration methods. New numerical methods are essential to address these computational challenges, effectively managing the diverse timescales in multi-fluid and multi-physics models. The widely used time operator splitting technique offers a straightforward approach but requires careful timestep management to avoid stability issues and errors. Despite some studies on splitting errors, their impact on solar and stellar astrophysics is often overlooked. We focus on a Multi-Fluid Multi-Species (MFMS) model, which presents significant challenges for time integration. We propose a second-order Partitioned Implicit-Explicit Runge-Kutta (PIROCK) method that combines efficient explicit and implicit integration te

Author

Wargnier, Q. M.; Vilmart, G.; Martínez-Sykora, J.; Hansteen, V. H.; De Pontieu, B.

Published

2024

Language

EN