Evolutions of stars, black hole accretion as well as interactions between stars and black holes play an important role in various astrophysical systems, such as supernova, X-ray binaries, AGNs as well as various transient phenomena. I will discuss some long standing issues related to massive star and black hole systems. Then I will describe some examples on how we can make progress on some of the key theoretical uncertainties based on 3D radiation magneto-hydrodynamic simulations. In particular, I will show how these simulations can be used to understand observations directly. Future directions will also be discussed.
Host: Hua Feng
