I see. Thank you.

That does help, except in my drop down list I only have Compressive and Modified HRIC.  I was hoping to use Geo-Reconstruct because it looks like it will help with the phases mixing too much.  Do I need some other setting enabled before the Geo-Reconstruct is available?  Please let me know.

The problem I am having is that the phases (liquid water and incompressible air) are mixing way beyond what is physical.  Here is an example of the contour of the water phase fraction 1 second after an air bubble rises to the top of a closed container. The container is 1cm wide with 0.1mm mesh sizing. In reality, no such massive phase gradient would exist like this.  I am wondering if Coupled Level set would be a better way to go.   Any suggestions would be helpful.