We present simulation results of late-stage coarsening of a 3D symmetric bi
nary fluid using a lattice Boltzmann method on a 256(3) grid. With reduced
lengths and times L. T (scales set by viscosity, density and surface tensio
n) our datasets taken together cover 1 < L <10(5) 10 < T < 10(8), equivalen
t to Reynolds numbers 0.1 < Re < 350.At Re > 100 we find clear evidence of
Furukawa's inertial scaling (L proportional to T-2/3), after a very broad c
rossover from the viscous regime (L proportional to T).