Flow in closed reservoir
 

Hello CFX Users,

I have the next problem in CFX. I would like to calculate a closed reservoir, what has one inlet only. (This inlet is for example a tube with small diameter). Thre is not outlet at the reservoir. The other boundary conditions are wall and symmetry. (I calculate with 2D structured hexa mesh.)
At the inlet there is a constant massflow. (The material is compressible evidently.) I would like to study the change of the pressure in the reservoir during a defined time interval.
The calculation has begun , but it has finished with "overflow" in every cases.
What can you advise to this situation? Can the CFX calculate without outlet at all?

Thanks!
Roland

Then you may model the reservior as a free surface problem. Defining the top surface as the outlet with liquid phase mass fraction as zero.