[rohit_turbo]

Dear all,

I have presently done a steady state analysis for a single stage axial flow compressor stage and the results are staisfactory.
But, I was keen enough to do a transient analysis in CFX-pre and to my demise everytime I run the CFX solver manager the errors that are being shown are :

COEFFICIENT LOOP ITERATION = 2 CPU SECONDS = 3.833E+02
----------------------------------------------------------------------
| Equation | Rate | RMS Res | Max Res | Linear Solution |
+----------------------+------+---------+---------+------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Overflow |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

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

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

End of solution stage.

+--------------------------------------------------------------------+
| The following transient and backup files written by the ANSYS CFX |
| solver have been saved in the directory F:/Rohit/Trial |
| Transient/Transient_104Kpa_pending_tasks/dp0_CFX_Solution/96Kpa_90 |
| speed_VG 3mm_002: |
| |
| 0_full.trn |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| F:/Rohit/Trial |
| Transient/Transient_104Kpa_pending_tasks/dp0_CFX_Solution/96Kpa_90 |
| speed_VG 3mm_002: |
| |
| mon |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| 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. |
+--------------------------------------------------------------------+

I am a newbie in transient and I have just tried my hands on transient analysis, so pls. If anybody could help with troubleshooting this error I shall be really glad.

Thanks
-Rohit

[-Maxim-]

Have you read the FAQ about this error and worked your way through the steps?
http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

You should post your CCL and/or your complete OUT-file and maybe some screenshots of your mesh.

[rohit_turbo]

Dear Maxim,

As I had already mentioned, steady state runs fine with the boundary conditions that I am using, but when it comes to transient analysis it gives the errors. I have attached the image files here.
If you would still require the CCL and the mesh file I shall upload that also.

Thanks
-Rohit

1.jpg

2.jpg

3.jpg

4.jpg

5.jpg

[-Maxim-]

Rohit, please read through that FAQ carefully. If your simulation runs with a certain mesh quality in steady-state, it doesn't automatically mean, that it will run in transient.
Also your time step settings are important. 0.1 minute seems way too high to me.

Some simulations require small time steps to start, but once going the time step can be increased.

And yes, please upload your CCL and/or OUT file and upload screenshots (detailed view) of your MESH.
Your max. coefficient loops are too high. The goal is to have them around 5-10.

I would suggest you do some transient tutorials and use that knowledge to set up your calculation

[rohit_turbo]

Dear Maxim,

Here are the files.

Thanks
-Rohit






Mesh.jpg
transient.zip