[Giulio_ska]

Hi everybody,

I'm new in this comunity, so hopefully you'll forgive my grammar and theoretical errors

I'm getting crazy with the solver of CFX! Sometimes apparently randomly it gives this kind of error message. And i really can't understand why.
Sometimes it works changing mesh but not always.

I'm simulating a single stage radial water pump, impeller plus volute...Steady simulation and meshes made by CFX mesher (the one in the workbench).

Any suggestions?!?!?

here the outfile:

....
+--------------------------------------------------------------------+
| ****** Notice ****** |
| Wall Heat Transfer Coefficient written to the results file uses |
| "Wall Adjacent Temperature" for the bulk temperature. If you want |
| to override the bulk temperature then set the expert parameter |
| "tbulk for htc = <value>" |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Mesh Statistics |
+--------------------------------------------------------------------+
| Domain Name | Orthog. Angle | Exp. Factor | Aspect Ratio |
+----------------------+---------------+--------------+--------------+
| | Minimum [deg] | Maximum | Maximum |
+----------------------+---------------+--------------+--------------+
| Default Domain | 12.6 ! | 55 ! | 64 OK |
+----------------------+---------------+--------------+--------------+
| | %! %ok %OK | %! %ok %OK | %! %ok %OK |
+----------------------+---------------+--------------+--------------+
| Default Domain | <1 5 95 | <1 1 99 | 0 0 100 |
+----------------------+---------------+--------------+--------------+

Domain Name : Default Domain

Total Number of Nodes = 2299781

Total Number of Elements = 6388417
Total Number of Tetrahedrons = 2969617
Total Number of Prisms = 3411142
Total Number of Pyramids = 7658

Total Number of Faces = 365436

+--------------------------------------------------------------------+
| ERROR #900200009 has occurred in subroutine GET_GVAR. |
| Message: |
| A global quantity has been requested but does not exist. This is |
| a fatal error because it can cause the run to hang in parallel. |
| The likely cause is a coding bug in the solver. |
| Variable: DOMVEL |
| Location: ZN1 /BCP3 |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| 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 user files have been saved in the directory |
| C:\Users\Giulio\girante_rifatta_2_001: |
| |
| mon |
+--------------------------------------------------------------------+


This run of the ANSYS CFX Solver has finished.

[ghorrocks]

The error message is pretty cryptic but I suspect that something is not properly defined in your CCL. I would suspect something to do with domain rotation on a boundary condition but that is just a guess.

[Giulio_ska]

Really thanks for the reply!

I tried lots of times, using the same definition file only replacing the mesh with anotherone (usually is the impeller who makes problems) and sometimes was working sometimes not.
The geometry was always the same the mesher as well. Usually the meshes were generated with different settings. But it has even happend that one mesh was working and one not, both defined in the same case file and made in the same way, with the same parameters... INCREDIBLE!
...
I saw a thread about this topic talking about a possible responsable in the functions like massFlowAve defined in the .def file. Therefore i tried to avoid any control point...but nothing...no way!

It seems a real bug of the solver...I'm still using ANSYS 12.0

Giulio

[ghorrocks]

Have you checked the setup of the domain rotation parameters like I suggested? Can you post your CCL?

[Giulio_ska]

Finally I've understood the mistake!!
As you suggested i checked the boundary conditions and they where set on rotating surfaces, when i switched to stationary the solver started without problems. (sorry for the trivial error!)
I was setting Total pressure and massflow on the inlet and outlet respectively.

Really thanks for the help!

PS. ghorrocks i saw many times in different Threads that you are always answering in a proper way! So thanks even for those answers!

Giulio