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-   -   Temperature, Pressure Limited + numerical error (http://www.cfd-online.com/Forums/main/13905-temperature-pressure-limited-numerical-error.html)

Michael P August 2, 2007 18:40

Temperature, Pressure Limited + numerical error
 
Hi,

Can anyone help with the following:

I get an error message that says:

Temperature limited to 1.000000e+00 and pressure is limited to 1.000000e+00 in XXXXXX cells etc

as well as

Error: FLOAT: invalid argument [1]: wrong type [not a number] Error Object: nan

in the error log.

Any ideas how to get around that? I am trying under-relaxation at the moment.

Michael

otd August 2, 2007 19:29

Re: Temperature, Pressure Limited + numerical erro
 
What code gives these messages?

What kind of problem (compressible, incompressible flow)?

Your questions have MANY answers until you spcify a finite problem.

Michael P August 2, 2007 19:40

Re: Temperature, Pressure Limited + numerical erro
 
Appreciated, but it is often the case that people have general advice on these standard errors if they have seen them before.

Here's some more info:

Fluent 6.3 3d -t4 compressible flow segregated solver conjugate heat transfer problem (heat inputs defined, other boundaries fixed at ambient temperature to take heat away) pressure inlet, pressure outlet and translational periodic boundary conditions defined. Mesh size ~ 6million cells. Tetraheral mesh.

thnx

otd August 2, 2007 19:57

Re: Temperature, Pressure Limited + numerical erro
 
Good.

Now the folks who are really into Fluent can help.

I'm not in that class, but I do expect you'll get the answers you need.

Alex August 3, 2007 12:00

Re: Temperature, Pressure Limited + numerical erro
 
Check your physics inputs. I had that in Star-CCM+ and realised I had set the temperature as 30K rather than 30C.


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