An Extension of the Athena++ Framework for General Equations of State

Understand

We present modifications to the Athena++ framework to enable use of general equations of state (EOS).

• Part of our motivation for doing so is to model transient astrophysics phenomena, as these types of events are often not well approximated by an ideal gas.
• This necessitated changes to the Riemann solvers implemented in Athena++.
• We discuss the adjustments made to the HLLC, and HLLD solvers and EOS calls required for arbitrary EOS.