Flow in closed reservoir

Roland R · March 19, 2009, 14:37

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

John · March 20, 2009, 19:30

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.

March 19, 2009, 14:37	Flow in closed reservoir	#1
Roland R Senior Member Roland Rakos Join Date: Mar 2009 Posts: 131 Rep Power: 17	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

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March 20, 2009, 19:30		#2
John Member Join Date: Mar 2009 Posts: 49 Rep Power: 17	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.