ABSTRACT
After briefly discussing viscosity in Chapter 1, we dispensed with it and until now have only looked at inviscid simulations. In fact our major problem has been that our numerical methods have too much numerical dissipation which, in the velocity field, looks like viscosity. We now will turn our attention to simulating highly viscous fluids, like molasses, and even variable viscosity fluids where some parts are more viscous than others perhaps due to heating or cooling, or desired animation effects.
