GRMHD simulations of black hole accretion in AsterX

Accreting supermassive single and binary black holes are crucial sources to understand the physics of strong gravity and magnetized plasmas in the most extreme regimes. They are emitters of strong electromagnetic radiation at various frequencies ranging from radio waves to gamma rays. AsterX is a new public GPU-enabled GRMHD code build within the Einstein Toolkit framework. In this talk, I will summarize the current effort and status of modelling highly magnetized accretion flows with AsterX. I will present simulations of single black hole accretion, low-angular momentum accretion flows onto a binary black hole as well as simulations of circumbinary disk accretion onto a binary.