Fatal overflow in linear solver.

XIAJINXIA · March 7, 2024, 07:32

I add a source to the Turbulence Kinetic Energy equation of the DES model,but after 500+ time steps ,CFX end with the error 'Fatal overflow in linear solver.',what can I do to solve the problem?

Opaque · March 7, 2024, 07:57

Quote:

Originally Posted by XIAJINXIA

I add a source to the Turbulence Kinetic Energy equation of the DES model,but after 500+ time steps ,CFX end with the error 'Fatal overflow in linear solver.',what can I do to solve the problem?

Which source did you use?

How did you implement the source?

Without details, it is not possible to suggest modifications.

XIAJINXIA · March 7, 2024, 08:37

I add a source to turbulent kinetic energy equation of DES model to make the model return to SST turbulence model，and then I can make use of Central Difference Scheme which can be only chosen in DES simulation.

XIAJINXIA · March 7, 2024, 08:38

Quote:

Originally Posted by Opaque

Which source did you use?

How did you implement the source?

Without details, it is not possible to suggest modifications.

I add a source to turbulent kinetic energy equation of DES model to make the model return to SST turbulence model，and then I can make use of Central Difference Scheme which can be only chosen in DES simulation.

Opaque · March 7, 2024, 09:30

That describes your goal, but not how you attempted the implementation.

Each person can come up with different ways to code the modification, perhaps there is an error in your formulas or expressions. How can we tell? or something missing in the setup to complete the source?

March 7, 2024, 07:32	Fatal overflow in linear solver.	#1
XIAJINXIA New Member 夏锦霞 Join Date: Mar 2023 Posts: 9 Rep Power: 3	I add a source to the Turbulence Kinetic Energy equation of the DES model,but after 500+ time steps ,CFX end with the error 'Fatal overflow in linear solver.',what can I do to solve the problem?

March 7, 2024, 09:30		#5
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	That describes your goal, but not how you attempted the implementation. Each person can come up with different ways to code the modification, perhaps there is an error in your formulas or expressions. How can we tell? or something missing in the setup to complete the source? __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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March 7, 2024, 08:37		#3
XIAJINXIA New Member 夏锦霞 Join Date: Mar 2023 Posts: 9 Rep Power: 3	I add a source to turbulent kinetic energy equation of DES model to make the model return to SST turbulence model，and then I can make use of Central Difference Scheme which can be only chosen in DES simulation.