SPH simulation of an accretion disc around a black hole, initially inclined at 90 degrees to the plane of the black hole spin (vector up the page, so the black hole spin vector is aligned with the plane of this disc). As the disc evolves the torque produced by the rotating black hole is stronger than the internal torque holding the disc together, causing rings of material to be torn off and precess effectively independently. This disc runs for almost 1600 orbits at the inner edge and the simulation uses 10 million particles.

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