CFX turbo machinery error
 

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.

This seems to be associated with density of air & absolute pressure. Please share Boundary conditions details & Models beings used or the .out file.

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

I have attached the out file as logfile.txt

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.

Are your boundary conditions correct ?
Is it correct, that your Inlet Total pressure is set dependent on the outlet total pressure of your diffuser?

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.