Error message CFX Solver

salilharris2 · September 24, 2010, 07:48

Your problem should be numerical instability.

The denominator consists of dx and dy terms which create instability when meshing is improper. The numerator consists of terms which contains terms like velocity, mass, temperature etc. When the values go beyond a certain limit, it destroys the stability of the system of equations.

Another way of loosing the numerical stability is when the continuity, momentum, energy and mass transport equations are solved together, the convergence of one equation depends on the equation above it. There can be convergence problems when all these equations are solved together.

In your case, one or more of your values are somewhere outside the limits. Try optimizing your values to get a numerically stable system of equations.
I hope this solves your problems...

Daniel Leite Oliveira · June 15, 2011, 10:49

I had the same error...
I've changed the Run Mode from MPICH2 Local Parallel to HP MPI Local Parallel and now it's gone

See you

hota · January 15, 2013, 10:47

this error message means a divergance in your solver, mostly cause of bad configurations in your presolver part, some times it happen cause of wrong or bad Boundary Conditions, bad B.C. some times produce zero denominators and make the solver diverge at the begining, my experiance is about Opening BC in CFX, where i chose Opening pressure and Dirn, and in direction part i chose cartesian components, then i entered a direction which was totaly tangent to my Boundary, so when i started the solver, it showed me Code1 or Code 255 as divergance alarm, look at your BC more carefully,
regards, ^_^

PYJG · November 29, 2013, 17:46

I had this error and was able to fix it....It was caused by antivirus deleting the mpid.exe file from the installation directory. Make sure this file exist there. Thanks.

ghorrocks · November 30, 2013, 05:36

Wow, that is one evil antivirus you have there.

dengemunzur · July 3, 2015, 11:32

Hi to all,

I am having a problem with CFX. When I try to stop run, CFX ends it but does not produce a result file. The problem is that everything goes well, the solution converges, also monitor point Iadded. when I stop the run, I face the warning "the cfx solver for system fluid flow did not produce a results file".

I tried to find a solution but could not achieve. By the way, I work on workbench.

Any idea?

Thanks

Best regards

June 15, 2011, 10:49		#22
Daniel Leite Oliveira New Member Daniel Leite Oliveira Join Date: May 2011 Posts: 3 Rep Power: 15	I had the same error... I've changed the Run Mode from MPICH2 Local Parallel to HP MPI Local Parallel and now it's gone See you crevoise and chaitanyaarige like this.

January 15, 2013, 10:47	Error message CFX Solver	#23
hota New Member ali Join Date: Jan 2013 Posts: 1 Rep Power: 0	this error message means a divergance in your solver, mostly cause of bad configurations in your presolver part, some times it happen cause of wrong or bad Boundary Conditions, bad B.C. some times produce zero denominators and make the solver diverge at the begining, my experiance is about Opening BC in CFX, where i chose Opening pressure and Dirn, and in direction part i chose cartesian components, then i entered a direction which was totaly tangent to my Boundary, so when i started the solver, it showed me Code1 or Code 255 as divergance alarm, look at your BC more carefully, regards, ^_^

November 29, 2013, 17:46	Fixed the issue	#24
PYJG New Member Join Date: Oct 2013 Posts: 22 Rep Power: 13	I had this error and was able to fix it....It was caused by antivirus deleting the mpid.exe file from the installation directory. Make sure this file exist there. Thanks. crevoise and chaitanyaarige like this.

July 3, 2015, 11:32	CFX does not produce .res file when stop the run	#26
dengemunzur New Member Join Date: Feb 2012 Posts: 14 Rep Power: 14	Hi to all, I am having a problem with CFX. When I try to stop run, CFX ends it but does not produce a result file. The problem is that everything goes well, the solution converges, also monitor point Iadded. when I stop the run, I face the warning "the cfx solver for system fluid flow did not produce a results file". I tried to find a solution but could not achieve. By the way, I work on workbench. Any idea? Thanks Best regards

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September 24, 2010, 07:48		#21
salilharris2 New Member compFrac Join Date: Aug 2010 Posts: 3 Rep Power: 0	Your problem should be numerical instability. The denominator consists of dx and dy terms which create instability when meshing is improper. The numerator consists of terms which contains terms like velocity, mass, temperature etc. When the values go beyond a certain limit, it destroys the stability of the system of equations. Another way of loosing the numerical stability is when the continuity, momentum, energy and mass transport equations are solved together, the convergence of one equation depends on the equation above it. There can be convergence problems when all these equations are solved together. In your case, one or more of your values are somewhere outside the limits. Try optimizing your values to get a numerically stable system of equations. I hope this solves your problems...

November 30, 2013, 05:36		#25
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Wow, that is one evil antivirus you have there.