  We present a study of viscous fingering using the Volume Of Fluid method and
a central injection geometry, assuming a Laplacian field and a simple surface
tension law. As in experiments we see branched structures resulting from the
Saffman-Taylor instability. We find that the area $A$ of a viscous-fingering
cluster varies as a simple power law $A \sim L^{\alpha}$ of its interface
length $L$. Our results are compared to previously published simulations in
which the viscosity of the invading fluid is vanishing. We find differences in
exponent $\alpha$ and in the appearance of detached droplets and bubbles.
