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Gravity Tests
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Tests for gravity methods. Runs gravity method using cg solver. Outputs mesh, phi, rho, x acceleration, y acceleration image files.

method_gravity_cg-1
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Tests ``EnzoMethodGravityCg`` at P=1 in 2D.


method_gravity_cg-8
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Tests ``EnzoMethodGravityCg`` at P=8 in 2D.