[louis]

Dear Users

I have a case of water jetting out horizontally into air with a very high velocity. The inlet is right on top of a cylinder - see pictures below.

Instead of the water following an almost horizontal trajectory it is turned strongly in a clock-wise direction around the cylinder in the direction of the escaping air - for a bodyfitted grid.

www.softflo.com/z28/images/bodyfitted.jpg

When the cylinder is blocked out in a Cartesian grid the curvature is much less but still present - the water velocity jets out at 1000 m/s - the cylinder diameter is 0.4 meters.

http://www.softflo.com/z28/images/Cartesian.jpg

Thus a change in momentum due to the fact that the scalar is convected in the direction of the velocities in the cells - the velocities however being averages for the water-air mixture in the cell. The next picture shows the velocity field after iteration 1 - the downward directed velocity field on the cylinder wall will probably initiate the downward motion of the water:

http://www.softflo.com/z28/images/Vectors1.jpg

Is this type of grid dependant behaviour documented somewhere for the VOF method?

The application that I want to model is typical that of milk poured out of a jug and depending on the spout it fans out (spills) or follows a nice clean trajectory into your tea cup.

How could such an application then be solved?

Kind regards
Louis

Ps. The solution was not attempted with Foam.