VOF problem

Jarrod Sinclair

Hi,

I am using the VOF model with Star-CD v3150A.020 for a water/air simulation in a 10cm X 10cm 2D domain with grid size of 0.2cm. I am implementing a sloshing effect by oscillating the gravity vector from -45deg to 45deg (period 0.3s) using SORMOM.F. After about ~2 seconds, a layer of "misting" (10% water concentration) develops on top of the water surface, and does not decay. Therefore the interface is not clearly defined anymore. Due to the scale I am not using surface tension. Also, the time-step used is keeping the mean Courant number well below 1. The same effect is seen with a finer grid of 0.1cm cells, and also for some other VOF problems I am studying.

Has anyone ever seen this problem before? Are there any techniques to minimize this misting? Can the VOF concentration be modified on an adhoc basis using SORSCA.F?

Thanks.