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-   -   Insufficent memory allocated allocation (http://www.cfd-online.com/Forums/cfx/125261-insufficent-memory-allocated-allocation.html)

wind81 October 22, 2013 10:08

Insufficent memory allocated allocation
 
Hi, i facing the problem with insufficient memory allocation for CFX. The number of node i have is about 24 million. I did increase the real stack memory size to 10x but the problem still the same. Anyone could please help me look on this problem?

+--------------------------------------------------------------------+
| *** INSUFFICIENT MEMORY ALLOCATED *** |
| |
| ACTION REQUIRED : Increase the real stack memory size. |
| |
| Details : |
| Requested space : 7536510 words |
| Current allocated space : 2147483646 words |
| Current used space : 2146470341 words |
| Current free space : 1013305 words |
| Number of free areas : 1 |
+--------------------------------------------------------------------+


Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = IELG177 CDTYPE = REAL ISIZE = 7536510
CRESLT = FULL

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN1/VERTICES/BETANEW/DrNPIp
+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| *** INSUFFICIENT MEMORY ALLOCATED *** |
| |
| ACTION REQUIRED : Increase the real stack memory size. |
| |
| Details : |
| Requested space : 12875173 words |
| Current allocated space : 2147483646 words |
| Current used space : 2146470341 words |
| Current free space : 1013305 words |
| Number of free areas : 1 |
+--------------------------------------------------------------------+


Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = SPHEATV_FL1 CDTYPE = REAL ISIZE = 12875173
CRESLT = FULL

Current Directory : /FLOW/SOLUTION/TSTEP1/CLOOP1/ZN1/VERTICES
+--------------------------------------------------------------------+
| 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.

ghorrocks October 22, 2013 18:53

Are you using some beta functionality? The error message suggests you are.

wind81 October 22, 2013 22:37

Hi, ghorrocks. I did not used any beta functionality for this simulation. Only have solid and fluid domain to study the heat transfer. May i know what is the error pointed to?

ghorrocks October 22, 2013 23:24

The error says it has run out of real stack - that is obvious. But the tricky bit is what caused it to run out. The first error is looking for "BETANEW" in the MMS and that could be beta features - but on second thoughts it is more likely hi-res differencing scheme.

You can get this error sometimes with complex GGI interfaces. If you have a 24M node mesh that might be the cause. Are your GGI interfaces complex?

wind81 October 23, 2013 00:24

Ghorrocks- thanks for your reply. For this model i used symmetry approach since full model is unlikely to mesh. The simulation is about the cooling fin, therefore there are alot of faces to couple for fluid and solid interface for heat transfer, i'm not sure whether this is complex or not. May i know how can i resolve this problem? reduce the mesh?

ghorrocks October 23, 2013 00:29

Yes, the large GGIs have caused problems like this for me in the past. Have you run it with a coarser mesh? I would start with that then refine the mesh from there.

wind81 October 23, 2013 01:51

Ghorrocks, thanks for your reply. I will coarsen the mesh and try.


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