Internal Static Pressure in a tank - ANSYS CFX
 

Hello everyone,

I would like to make a tank for my internship.
My subject is "Numerical Simulation of a tank submitted to an earthquake".

I have some problems :

1) Inside my tank, I have water and air. But I have a problem with the interface when I had a horizontal acceleration to simulate the seism. Do I have to use "Free surface model" ? Or maybe it's the sizing mesh, but I have already do something about it.
I put a picture as attachment. In red the water, in blue air.

2) I can't add an internal pressure. In inizialization settings, I add it, but I can't see any changement in the post-proc.
Does someone have any idea ?

Thanks a lot

interface--> Definition
 

I had the same issue with the interface. I defined the volume fraction and obtain this:

https://www.cfd-online.com/Forums/at...tersurface.png

https://www.cfd-online.com/Forums/at...tkvfwater3.png


you can read more at my post
https://www.cfd-online.com/Forums/cf...f-command.html

Which condition did you use for the top ?
And with a thinner mesh it should be better ;)

approximation cases first before run
 

For the top I used opening as boundary condition at 0 KPa.

Yes, with a thinner mesh it will be better; I will use the refined one when I get some reliable results.

My priority is get rid of the common errors first. At the beginning I do a steady simulation, then the transient, and finish with the refined mesh.

Sloshing tutorial
 

I found these tutorial, maybe it could help you.

https://www.youtube.com/watch?v=oIFfPEWHkxw

https://www.youtube.com/watch?v=SwSbXwIKoto