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Internal Static Pressure in a tank - ANSYS CFX

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Old   June 13, 2017, 10:51
Default Internal Static Pressure in a tank - ANSYS CFX
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glik
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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
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File Type: png modele 5 a acc horizontale gimp - Density.png (56.9 KB, 6 views)
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Old   August 9, 2017, 18:09
Default interface--> Definition
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Fernando
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Quote:
Originally Posted by glik View Post
(...) 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
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Old   August 16, 2017, 12:07
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glik
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Which condition did you use for the top ?
And with a thinner mesh it should be better
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Old   August 17, 2017, 09:16
Default approximation cases first before run
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Quote:
Originally Posted by glik View Post
Which condition did you use for the top ?
And with a thinner mesh it should be better
Quote:
Originally Posted by camposrf View Post
(...)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.
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Old   August 17, 2017, 09:25
Default Sloshing tutorial
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Fernando
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I found these tutorial, maybe it could help you.

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

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