[mach000]

Originally Posted by 100tinela

Hi,

Yes, it´s my first multiphase simulation and I can´t find anywhere an example for a similar simulation in Ansys CFX. As a first aproximation, I created a simple cilynder using ICEM tools and allowed an auto sizing meshing.
My parameters are basically a rotating wall, 2 rad/s, and top surface open to atmosphere and my initial condition is that 50% of cilynder volume is full of water. I think my problem is setting this initial level of water and make sure that there is a two phase situation (Air, Water). Is there any difference in results between defining a new material as a mixture and selecting two materials in domain settings?

Thanks a lot for your help,
Willian

Ps.: ICEM Mesh: http://img641.imageshack.us/i/cilindro.png/

First of all i think the mesh in not the correct one for a multiphase problem. You have to create a mesh with very small elements near the position of the freesurface. The elements of your mesh are too big and they are not able to model the freesurface correctly.
Then, why don't you try to create an hexa elements mesh?
Finally, in order to simulate a multiphase simulation you need to define some expression such as Stevin Law and the initial quote of the freesurface. You will find theese expressions in some tutorials. Let me know