sloshing
 

hello
I have been working on doing a transint FSI analysis using CFX v12.1 of a rectangular tank . I am trying to simulate the sloshing of the liquid and the interaction between the tank and liquid. the tank is moving in x direction with sinsoidal displacement.

I have successfully run the problem ( liquid onlyy) using a cfx (moving walls as boundary conditions) but i am trying to study the interaction between the liquid and the tank the ansys give me this error

ERROR #002100061 has occurred in subroutine SERVE_CLIENTS. |
| Message: |
| The connection between this CFX process and an external process |
| has died unexpectedly. The following error was received: |
| External process : ANSYS |
| Error experienced : Read |
| |
| ** This error is fatal: Terminating ANSYS CFX Solver execution ** |
| Please review the output, error and log files from both the CFX |
| and external processes to determine the cause of the error.

I have just started to work with fsi ,i follow the instruction as in Tutorial 21 everthing it is very good

Please criticise as much as possible as I am very new to FSI and need all the help I can get. If you could maybe direct me to some tutorials so I can help myself that would also be appreciated.

Thank you in advance and I hope to hear from you soon.

Your error message says that the Ansys part of the simulation crashed, so you'll need to look at the ANSYS.stdout file to find out what when wrong.

thanks my dear lance for your help, but where i can find this file

thanks my dear lance for your help, but where i can find this file

i open the ansys.stdout file and find the following error
*** ERROR *** CP = 1.531 TIME= 04:47:27
CONTAC171 through CONTAC177 elements with KEYOP(2)=2 are invalid
elements for the Multifield Solver.
*** ERROR *** CP = 1.547 TIME= 04:47:27
CONTAC171 through CONTAC177 elements with KEYOP(2)=2 are invalid
elements for the Multifield Solver.
2nd sync. point: Get interface mesh

what is the problem and the solution pls

Seems like there is something wrong with your contact elements. Did you use workbench to generate the .inp file? Do you need contact elements in your (solid) tank?

As you have not described how your solid domain look like, and my knowledge about Ansys mechanical is somewhat limited, I cant give you any further advice.

thanks my dear
yes i used workbench 12.1 to model my project the tank is a hollow rectangle 50 cm width 25 cm height and 1 cm thichness, the tank meshed in mechanical transient (ansys) through workbench

hi, I have had the same problem .Do you solve it?

sloshing
 

hello, where I find the tutorial 21.
thanks in advance

It is between tutorials 20 and 22 in the CFX tutorials documentation.

yes, but in the tutorial that is in the program?

sorry, a query. how do I model the two fluids in the tank, when Medelo two fluids, two bodies, both are water or both are air, I can not create two different fluids.
I appreciate your help

Yes, in the CFX tutorials documentation which is part of the default installation.

Are you asking how do you set up the liquid and gas fluids? Have a look at the CFX tutorials, especially the flow over a bump one.

thank you very much, I will try.

ghorrocks,
if you had a document on this subject to be able to model two fluids in a domain, I would greatly appreciate

I have no documents as the CFX tutorials explain the basics pretty well. For more detailed documentation chase up the references in the documentation and ask CFX support.

which is the equation of oscillation to simulate the movement of water in a tank in CFX.
Some tutorial please

See post #16 - same comment.

If you want more specific help you had better explain what you are trying to do better.