[newbie384]

Hi

I got the following error when I tried to run my simulation in CFX, which consists of several parts joined together by interface. Can anyone advise on how to solve this error? Thank you in advance.

+--------------------------------------------------------------------+
| ********* WARNING ********* |
| First side of interface |
| Impeller Cone to Inlet Passage wo IGV |
| seems to contain a vertex at R=0 (Rmin/Rrange < GGI ETA TOLERANCE).|
| This is not supported for stage interfaces. |
+--------------------------------------------------------------------+






+--------------------------------------------------------------------+
| ********* WARNING ********* |
| Second side of interface |
| Impeller Cone to Inlet Passage wo IGV |
| seems to contain a vertex at R=0 (Rmin/Rrange < GGI ETA TOLERANCE).|
| This is not supported for stage interfaces. |
+--------------------------------------------------------------------+




+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| For domain interface "Impeller Cone to Inlet Passage wo IGV" the |
| pitch angle ratio of 2.1702235E+00 does not match the area |
| ratio of 1.0003759E+00. |
| |
| |
| |
+--------------------------------------------------------------------+

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

[ghorrocks]

The first 3 error message are self-explanatory, aren't they? The last error is probably caused by the first 3.

[newbie384]

Thanks for the response. I think I found the source of error. One of my domain has zero radius and CFX does not allow the use of automatic pitch change in the setup of interface.
When I specified the pitch angles explicitly, the problem is solved.

[elia_l]

Hi all,
I got more or less the same error, but even specifying pitch change angle, the error persists.
Here the log:

+--------------------------------------------------------------------+
| |
| Partitioning |
| |
+--------------------------------------------------------------------+




+--------------------------------------------------------------------+
| |
| ANSYS(R) CFX(R) Partitioner |
| |
| 2019 R2 |
| Build 19.4 2019-04-08T23:34:08.549000 |
| Tue Apr 9 01:56:35 GMTDT 2019 |
| |
| Executable Attributes |
| |
| single-64bit-int32-archfort-optimised-std-lcomp |
| |
| (C) 1996-2019 ANSYS, Inc. |
| |
| All rights reserved. Unauthorized use, distribution or duplication |
| is prohibited. This product is subject to U.S. laws governing |
| export and re-export. For full Legal Notice, see documentation. |
+--------------------------------------------------------------------+




+--------------------------------------------------------------------+
| Job Information at Start of Run |
+--------------------------------------------------------------------+

Run mode: partitioning run

Host computer: LM (PID:1552)

Job started: Tue Aug 6 02:31:04 2019

+--------------------------------------------------------------------+
| License Information |
+--------------------------------------------------------------------+

License Cap: ANSYS CFX Solver (> 512K Nodes)
License Cap: Multiple Reference Frames
License Cap: Parallel
License ID: LM-LM-9128-013356

INFO: Your license enables 4-way parallel execution.
For faster simulations, please start the application with the
appropriate parallel options.


+--------------------------------------------------------------------+
| Memory Allocated for Run (Actual usage may be less) |
+--------------------------------------------------------------------+

| Real | Integer | Character | Logical | Double
----------+------------+------------+-----------+----------+----------
Mwords | 24.48 | 167.78 | 8.00 | 0.12 | 1.20
Mbytes | 93.40 | 640.03 | 7.63 | 0.46 | 9.16
----------+------------+------------+-----------+----------+----------


+--------------------------------------------------------------------+
| Host Memory Information (Mbytes) |
+--------------------------------------------------------------------+
| Host | System | Allocated | % |
+-------------------------+----------------+----------------+--------+
| LM | 24559.22 | 750.68 | 3.06 |
+-------------------------+----------------+----------------+--------+

+--------------------------------------------------------------------+
| The MeTiS partitioning method allocates additional memory. |
| Total memory usage will therefore exceed the values shown above. |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Topology Simplification |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ****** Warning ****** |
| |
| Topology simplification is activated with the following |
| restrictions: |
| |
| - Mesh regions referenced only within User Fortran and NOT |
| in the command file will cause the solver to stop. |
| - The solver will stop during any "Edit Run in Progress" step |
| if new 2D regions are referenced. |
+--------------------------------------------------------------------+



+--------------------------------------------------------------------+
| ********* WARNING ********* |
| First side of interface |
| interface_str_rtr_radial_top |
| seems to contain a vertex at R=0 (Rmin/Rrange < GGI ETA TOLERANCE).|
| This is not supported for Stage (Mixing-Plane) interfaces. |
+--------------------------------------------------------------------+






+--------------------------------------------------------------------+
| ********* WARNING ********* |
| Second side of interface |
| interface_str_rtr_radial_top |
| seems to contain a vertex at R=0 (Rmin/Rrange < GGI ETA TOLERANCE).|
| This is not supported for Stage (Mixing-Plane) interfaces. |
+--------------------------------------------------------------------+




+--------------------------------------------------------------------+
| *** INSUFFICIENT MEMORY ALLOCATED *** |
| |
| ACTION REQUIRED : Increase the real stack memory size. |
| |
| Details : |
| Requested space : 4194304 words |
| Current allocated space : 24484470 words |
| Current used space : 21062254 words |
| Current free space : 3422216 words |
| Number of free areas : 1 |
+--------------------------------------------------------------------+


Details of error:-
----------------
Error detected by routine MAKDAT
CDANAM = XMIN CDTYPE = REAL ISIZE = 4194304
CRESLT = FULL

Current Directory : /FLOW/MESH/TSTEP0/CLOOP0/ZIF7/SRF_FRAC1

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

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX partitioner exited with return code 1. |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| C:/Users/LM/Desktop/emulsionatore |
| pelle/simu_pending/dp0_CFX_Solution/CFX_001: |
| |
| trace |
+--------------------------------------------------------------------+


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


This run of the ANSYS CFX Solver has finished.






One very strange thing I noted, if I run the simulation with Serial (no partitioning), it works, but if I try to run it on more cores (intel local), it crashes.
Please check two images attached.
I want to point out the mesh size difference between rotor and stator has been already fixed, keeping more or les the same size (I have ram enough to run the entire model).

Thanks in advance guys.


Elia

[ghorrocks]

I have no idea what those images are showing. Can you please explain them.

But your output file is showing you ran out of stack size, and you should increase the stack size as it recommends. If you don't know how to do this - use the CFX documentation.

[elia_l]

Hi all,
I'll try to better explain the problem with some photos. It is an emulsioner located at the bottom of a tank. It is composed by a single crown toothed rotor and a double crown toothed stator. The rotor is 120° periodic and stator (I modelled stator fused with tank fluid geometry) 15° periodic. The number of nodes for rotor (considering only the periodic section) are 2465794 and 661767 for stator. I have 24gb RAM memory. I'm trying to exploit of periodicity in order to reduce the number of elements (nodes), but I still have problems with allocated memory and I can't understand the why. One thing I noted, it takes to much time to open/save/refresh the model considering the number of nodes used. The problem with memory disappear if I run the simulation with serial.

Furthermore, it faces with another problem related to "vertex at R=0"... Why should it be a problem a vertex coincident with rotational axis?


Let me know if some further clarification are needed.


Regards,
Elia

[ghorrocks]

Note that your memory error is a stack memory issue, not a physical memory issue. So the amount of RAM you have is not relevant. The solver estimates the amount of stack memory it needs and in this case it was not enough so it crashed with an error. The error message tells you what to do - you have to manually increase the stack size.

[elia_l]

Sorry for the delay!
I followed your advice and it worked!!! Thanks a lot!
inside partition section I increased values with a 1.6 multiplier.


Thanks a lot!!!


elia_l