Time evolution of the vortensity minimum (top, normalized to its initial value) and relative variation in the total integrated vorticity (bottom) for the hydrodynamical vortex problem. Dotted, dashed, and solid lines refer to computations obtained at the resolutions of 256 × 1024, 512 × 2048, and 1024 × 4096 grid zones, respectively. Black and red colors correspond to the the standard integration algorithm and FARGO-MHD, respectively.