Simulation Reveals Spiraling Supermassive Black Holes

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The blank circular region between the two black holes wasn’t modeled in this version of the simulation, which took the Blue Waters supercomputer 46 days on 9,600 computing cores to produce. The reason it was not included was because the grid of points in space, or "3-d pixels", at which the physics equations are solved pinch together like thin pizza slices at the center of the region. Since the spacing between these points is so small and the dynamics are so fast, it requires the simulation to take very small steps in time to capture the motion across these small distances. This is called the Courant condition. Covering the center region means we would have to make the "pizza slices" even thinner and make our time steps even smaller, so our simulation would have to take many more animation steps to reach the same point in time. Future models will map the gas passing between the black holes in that region, but will require even more processing power or new methods of gridding (which are under development).
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