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We analyze a recent experiment of Sharon \textit{et al.} (2003) on thecoarsening, due to surface tension, of fractal viscous fingering patterns(FVFPs) grown in a radial Hele-Shaw cell. We argue that an unforced Hele-Shawmodel, a natural model for that experiment, belongs to the same universalityclass as model B of phase ordering. Two series of numerical simulations withmodel B are performed, with the FVFPs grown in the experiment, and withDiffusion Limited Aggregates, as the initial conditions. We observedLifshitz-Slyozov scaling $t^{1/3}$ at intermediate distances and very slowconvergence to this scaling at small distances. Dynamic scale invariance breaksdown at large distances.Comment: 4 pages, 4 eps figures; to appear in Phys. Rev.

Scaling anomalies in the coarsening dynamics of fractal viscous fingering patterns