Accretion Disk Dynamics (2D)

This 2D top-down simulator models the real orbital and thermal physics of an accretion disk: matter follows Keplerian differential rotation (ω ∝ r^-1.5, so inner material laps the black hole far faster than the outer disk), glows hotter toward the center on a real thin-disk temperature profile (T ∝ r^-0.75), and slowly spirals inward as viscosity transports angular momentum outward — with a central-mass slider that speeds up every orbit and raises the whole temperature profile, and a viscosity slider that controls how fast matter drains onto the black hole.