Error in FSI simulation
 

Dear all,

I am doing FSI simulation in a constricted model. The following error occurred in the middle of solution.

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

Does anybody know where the error comes from.
Thank you.
Regards,'
AshtonJ

If you'd bother to use the search function on the forum you wound find that it's because the solid solver died. See the output from mechanical to found out why.

Thank you very much. The following crash recovery file is written, however, I don't know how I can open the file to see where the problem is from. Do you know how this crash file can help me to diagnose the problem.

"Fluid_006.res.er"

The following error message is also given:

Fatal error occurred when requesting Total Mesh Displacement for Interface.

Is this problem because of mesh?

appreciate your help.
Regards,
AshtonJ

Have a look at the ANSYS.stdout and ANSYS.err files

Dear Lance,

I've got the same error message for a very simple FSI problem. I tried to do FSI simulation in a straight pipe with sinusoidal pressure waveform at inlet and zero pressure at outlet. First, I used very small mesh numbers for fluid and solid parts (8500 elements), the solution converged, however, I did not observe any mesh displacement, it was like a solid body. Then, I increased the number of mesh elements to 45000, the following error message was given:

"The connection between this CFX process and en external process has died unexpectedly. The following error message was received.
External process: Ansys
Error experienced: Read"

As you recommended, I checked ANSYS.stdout and ANSYS.err files, could not find any helpful information, there was just a warning that the “maximum number of stagger iterations has been reached for multifield solver but the interface quantities have not yet converged. The analysis will proceeds to the next time step. Increase number of
stagger iterations using the MFITER command for converged interface solution.”

There is an ANSYS FSI tutorial which is quite similar to my problem, it's "2way transient FSI in a hose". Does anybody know how I can find it. I tried to get it from Ansys customer portal web, however, could not find it.

Thank you.
regards,
AshtonJ

Hi,
i got this problem:
+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| CFX encountered the error: Read. Fatal error occurred when reque- |
| sting Total Mesh Displacement for interface.

this may be the same to some of ashtonJ's problem. Some say this may be the problem of the mesh, i will try it tomorrow.

Do you solve this problem? Could you give me some information?

Hi,
Did you guys solve this error. I am having the same error and i have no idea what to do about it. Please help me out.

same problem
 

Hello every body.
I modeled a blood vessel which input velocity is variable and output pressure is variable too. When i run it this error comes up.
Thanks if you can help me.
hani.


+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| CFX encountered the error: Read. Fatal error occurred when reque- |
| sting Total Mesh Displacement for interface. |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| cplg_SendCommand failed to send the command: ERROR -- CFX encount- |
| ered the error: Read. Fatal error occurred when requesting Total |
| Mesh Displacement for interface. |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine cplg_SendCommand |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |F
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| ANSYS Solver terminated with return code 256 |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The results from this run of the ANSYS solver have been written to |
| C:\Users\09133053122\Desktop\model |
| 8.1_pending\dp0_CFX_Solution_1-1\Fluid Flow CFX_002.ansys |
+--------------------------------------------------------------------+

f
+--------------------------------------------------------------------+
| Warning! |
| |
| The ANSYS CFX Solver has written a crash recovery file. This file |
| has been saved as C:/Users/09133053122/Desktop/model |
| 8.1_pending/dp0_CFX_Solution_1-1/Fluid Flow CFX_002.res.err and |
| may be an aid to diagnosing the problem or restarting the run. |
| More details should be available in the solver output section of |
| the output file. |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| C:/Users/09133053122/Desktop/model |
| 8.1_pending/dp0_CFX_Solution_1-1/Fluid Flow CFX_002: |
| |
| mon |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| For CFX runs launched from Workbench, the final locations of |
| directories and files generated may differ from those shown. |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| Warning! |
| |
| After waiting for 60 seconds, 1 solver manager process(es) appear |
| not to have noticed that this run has ended. You may get errors |
| removing some files if they are still open in the solver manager. |
+--------------------------------------------------------------------+


This run of the ANSYS CFX Solver has finished.