[glik]

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

[camposrf]

Originally Posted by glik

(...) I have a problem with the interface when I had a horizontal acceleration to simulate the seism. (...)

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






you can read more at my post
CFX 10.0 If command

[glik]

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

[camposrf]

Originally Posted by glik

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

Originally Posted by camposrf

(...)it is a coarsed one. I have to do approximation cases first before run a detailed model “if I want the results this year” (joke). Further more, it has a worst residuals convergence (0.01). The good news is that the time step is ok because it is a steady simulation.
I have to do this previous work because I do not have a powerful PC. I accept donations (is not a joke).

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.

[camposrf]

I found these tutorial, maybe it could help you.

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

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