Non-zero exit code while simulating Compressor flow

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  • Last Post 1 weeks ago
lizm posted this 3 weeks ago

I have been getting a non-zero exit code : 2 when I try to run CFX solution. I used Ansys 15.0 tutorial on centrifugal compressor. What could be the problem? The mesh and set-up have updated but when it comes to solution it gives me the error.

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abenhadj posted this 3 weeks ago

Hi, 

Can you carry out the tutorial on centrifugal pump once again? Perhaps you missed a thing. For the CFX Tutorials, you can play a *.pre session in order to end up with the finalized settings.

A.

Best regards

lizm posted this 3 weeks ago

Thank you, let me try it.

lizm posted this 2 weeks ago

@abenhadj, I re-did the centrifugal compressor tutorial and still ended up with the error. 

My procedure was as follows:

I used Vista CCD to design the compressor; it had 24 blades and the inlet temp was 298. I kept the other values at default. I transfered the information from Vista CCD to BladeGen. I had already un-selected Merge Blade Topology and Create Fluid Zones. in the mesh, the Topology set did not have  H/J/C/L grid topology, so I continued with the other changes. In Mechanical Model, the default settings of physical references remained. I defined the virtual topology and control methods. In CFX, I configured the basic setting to Centrifugal compressor and followed the instructions given.  On running the solution, I got the error.

I do not know where I am going wrong.

abenhadj posted this 2 weeks ago

On which tutorial are you working? The tutorial I was actually referencing is "Aerodynamic and Structural Performance of a

Centrifugal Compressor" 

Best regards

lizm posted this 2 weeks ago

I was working on that one.

I have been experiencing the error even when using fluent and CFX. I am working on centrifugal compressor flow and was using the tutorial as a guide. in fluent, I had used Vista CCD, kept the default settings in duty and aerodynamic data but changed the geometry to vaneless, and main blades to 7 without splitter. In the set-up, I select steady-state, energy model with viscous model SST. The material that I use is Air. For CFX, I input 1 bar as inlet pressure with a mass flow of 0.6kg/s.

i honestly do not know where I am going wrong.

abenhadj posted this 2 weeks ago

Please elaborate a bit on the issue: Are you experiencing problems with the tutorial itself?

Best regards

lizm posted this 2 weeks ago

Yes, I am having a problem with the tutorial. I cannot pin point where the error is arising from. 

abenhadj posted this 2 weeks ago

At which stage?

Best regards

lizm posted this 2 weeks ago

The solution part in CFX. I am not able to pin point the source of non-zero exit code:2.

abenhadj posted this 2 weeks ago

Does the error occur immediately? 

Best regards

lizm posted this 2 weeks ago

At the solution stage in CFX. 

lizm posted this 2 weeks ago

It does not occur immediately. It starts to solve then after some seconds it stops and gives a message of the error.

abenhadj posted this 2 weeks ago

Can you past some relevant lines from the out file before the error message is printed out? Are there any error messages written in the out file?

Best regards

lizm posted this 2 weeks ago

 ======================================================================

 OUTER LOOP ITERATION =    3                    CPU SECONDS = 4.657E+01

 ----------------------------------------------------------------------

 |       Equation       | Rate | RMS Res | Max Res |  Linear Solution |

 +----------------------+------+---------+---------+------------------+

 | U-Mom                |99.99 | 2.3E-03 | 1.9E-01 |       3.4E-04  OK|

 | V-Mom                |99.99 | 4.4E-03 | 3.9E-01 |       2.6E-04  OK|

 | W-Mom                |99.99 | 2.6E-04 | 3.7E-02 |       6.5E-03  OK|

 | P-Mass               |40.89 | 1.4E-08 | 6.1E-06 |  9.3  3.6E+00  F |

 +----------------------+------+---------+---------+------------------+

 | H-Energy             | 1.20 | 3.1E-03 | 7.5E-01 |  5.9  3.5E-02  OK|

 +----------------------+------+---------+---------+------------------+

 | K-TurbKE             | 0.72 | 2.6E-03 | 5.8E-01 |  5.9  1.7E-02  OK|

 | E-Diss.K             | 0.55 | 4.2E-03 | 1.0E+00 | 45.9  4.1E-09  OK|

 +----------------------+------+---------+---------+------------------+

 +--------------------------------------------------------------------+

 | Notice: The maximum Mach number is  3.108E+04.                     |

 +--------------------------------------------------------------------+

 

 ======================================================================

 OUTER LOOP ITERATION =    4                    CPU SECONDS = 6.725E+01

 ----------------------------------------------------------------------

 |       Equation       | Rate | RMS Res | Max Res |  Linear Solution |

 +----------------------+------+---------+---------+------------------+

 

 +--------------------------------------------------------------------+

 | ERROR #004100018 has occurred in subroutine FINMES.                |

 | Message:                                                           |

 | Fatal overflow in linear solver.                                   |

 +--------------------------------------------------------------------+

 

 +--------------------------------------------------------------------+

 |                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          |

 | DTHESIS/Compressor_pending/dp0_CFX_Solution/CFX_002:             |

 |                                                                    |

 | mon                                                                |

 +--------------------------------------------------------------------+

 

 

 +--------------------------------------------------------------------+

 | 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.

abenhadj posted this 2 weeks ago

Please double check the settings and go through the tutorial one more. I have done the tutorial but only the CFX part without Mechanical and It is working for me. 

Best regards

lizm posted this 2 weeks ago

How do I check the setting? Where do I go?

abenhadj posted this 2 weeks ago

First of all you work only on the CFX component disregard the Mechanical part. Just create the interfaces in CFX and include the interface for the internal GGI inerface (tip). You can just connect the CFX to Turbo Grid and work then this out.

Best regards

lizm posted this 1 weeks ago

Could you please elaborate more on the GGI  inerface (tip)?

abenhadj posted this 1 weeks ago

Here the interfaces I have 

 

and here the internal interface which connects the shroud tip sides (created in TurboGrid)

 

 

Best regards

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