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October 26, 2022, 00:52 |
CFX turbo machinery error
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#1 |
Member
MANU P ANAND
Join Date: Jul 2014
Location: Daegu , REPUBLIC OF KOREA
Posts: 36
Rep Power: 12 |
I am facing an error, I am simulating a compressor CFD simulation, working fluid air.
The error is following. Why is it happening? Is it because of my boundary conditions "The maximum Mach number is 3.709E+01. " why this is showing? ************************************************** ************* ================================================== ==================== OUTER LOOP ITERATION = 293 ( 40) CPU SECONDS = 3.792E+05 (6.057E+04) ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom | 0.32 | 1.8E-04 | 1.0E-01 | 1.7E-03 OK| | V-Mom | 0.37 | 1.4E-04 | 1.1E-01 | 1.4E-03 OK| | W-Mom | 0.57 | 6.1E-04 | 8.4E-01 | 2.9E-03 OK| | P-Mass | 0.38 | 2.3E-04 | 4.6E-01 | 5.2 3.6E-02 OK| +--------------------------------------------------------------------+ | ****** Notice ****** | | A wall has been placed at portion(s) of an OUTLET | | boundary condition (at 53.5% of the faces, 46.1% of the area) | | to prevent fluid from flowing into the domain. | | The boundary condition name is: stator Outlet. | | The fluid name is: Fluid 1. | | If this situation persists, consider switching | | to an Opening type boundary condition instead. | +--------------------------------------------------------------------+ +----------------------+------+---------+---------+------------------+ | H-Energy | 2.10 | 1.1E-03 | 1.3E+00 | 5.7 4.9E-04 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE | 0.10 | 5.2E-04 | 9.6E-01 | 5.7 4.1E-04 OK| | E-Diss.K | 0.44 | 9.5E-04 | 1.8E+00 | 23.8 4.8E-08 OK| +----------------------+------+---------+---------+------------------+ +--------------------------------------------------------------------+ | Notice: The maximum Mach number is 3.709E+01. | +--------------------------------------------------------------------+ ================================================== ==================== OUTER LOOP ITERATION = 294 ( 41) CPU SECONDS = 3.806E+05 (6.201E+04) ---------------------------------------------------------------------- | 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 | | D:/manupa/CFX/workdirectory/1500_retrofit/retro_pending/dp0_CFX_S- | | olution/CFX_006: | | | | mon, pids | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | For CFX runs launched from Workbench, the final locations of | | directories and files generated may differ from those shown. | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | 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. | +--------------------------------------------------------------------+ This run of the ANSYS CFX Solver has finished. |
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October 26, 2022, 01:40 |
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#2 |
New Member
Neel
Join Date: Nov 2018
Posts: 12
Rep Power: 7 |
This seems to be associated with density of air & absolute pressure. Please share Boundary conditions details & Models beings used or the .out file.
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October 26, 2022, 05:48 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
Your simulation has diverged and the crazy Mach number in the iteration before it diverges is because it is starting to go haywire.
See FAQ: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F
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October 26, 2022, 22:29 |
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#4 |
Member
MANU P ANAND
Join Date: Jul 2014
Location: Daegu , REPUBLIC OF KOREA
Posts: 36
Rep Power: 12 |
I have attached the out file as logfile.txt
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October 27, 2022, 01:07 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
There is nothing obviously wrong with the output file, but that only shows part of what is happening. Have you read the FAQ I linked to? It says exactly what you need to look for.
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October 27, 2022, 02:40 |
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#6 |
Senior Member
Daniel
Join Date: Feb 2017
Location: Germany
Posts: 167
Rep Power: 9 |
Are your boundary conditions correct ?
Is it correct, that your Inlet Total pressure is set dependent on the outlet total pressure of your diffuser? |
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October 27, 2022, 08:30 |
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#7 |
Senior Member
Join Date: Jun 2009
Posts: 1,860
Rep Power: 33 |
Zacko's comment is spot ON.
For a device that requires work (rotor does), and includes friction (viscous fluid), how can the Total Pressure can be conserved from Inlet to Outlet Total pressure Outlet = Total Pressure Inlet + <Total Pressure Increase due to work> - Total Pressure Losses (Rotor + Stator) Something seems wrong.
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cfx, turbo machinery |
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