Coffee Cup Model - Combined Fluid Dynamics and Heat Transfer

Turns out through a bit of research COMSOL already published a simulation similar to mine - a cold glass cooling down, complete with a nice animation.  I can't quite figure out how they did theirs, but the model I have currently cannot be correct - it simply takes way to long to converge.  Below is the initial profile and the profile at 65s; the well developed temperature contours present in the model without fluid dynamics are gone and we have the cooler liquid sinking to the bottom.