Constrained transport and adaptive mesh refinement in the Black Hole Accretion Code

Understand

Worldwide very long baseline radio interferometry arrays are expected to obtain horizon-scale images of supermassive black hole candidates as well as of relativistic jets in several nearby active galactic nuclei.

• This motivates the development of models for magnetohydrodynamic flows in strong gravitational fields.
• The Black Hole Accretion Code (BHAC) intends to aid with the modelling of such sources by means of general relativistic magnetohydrodynamical (GRMHD) simulations in arbitrary stationary spacetimes.
• New additions were required to guarantee an accurate evolution of the magnetic field when small and large scales are captured simultaneously.