We might want to consider an artificial viscosity term including the mixing length theory. Many people say it is beneficial in terms of stability and it does not lead to disappearing mass and alike. See http://www.flow3d.com/cfd-101/cfd-101-artificial-viscosities.html and Axel Ohrt Johansen's PhD.
We might want to consider an artificial viscosity term including the mixing length theory. Many people say it is beneficial in terms of stability and it does not lead to disappearing mass and alike. See http://www.flow3d.com/cfd-101/cfd-101-artificial-viscosities.html and Axel Ohrt Johansen's PhD.