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ioana March 1, 2005 04:55

error creating a material
 
Hi everybody,

I created a new material : reacting mixture KeroseneAir (composed of C02, h20, O2 and Kerosene).

I introduced all the properties in the material database and I created a recation KeroseneAir.

I receive the following mesasge:

| ****** Notice ****** | | | | The property STDENTR | | is only present in some of the components of the mixture | | KeroseneAir.

Does anyone what this means?

Regards, Ioana

Jeff March 2, 2005 01:47

Re: error creating a material
 
STDENTR is Standard Entropy, I think. It is not specified in one of the components you are using. If this is a warning, and not an error wich stops the solver, you can ignore it. If you are using the std. entropy to calculate the reaction rates automatically, you may have to supply it for the component in which it is missing.

Regards, Jeff

ioana March 2, 2005 03:51

Re: error creating a material
 
Thank you very much Jeff.

As you guessed this notice doesnt stop the solver. Although my case works fine for a coarser mesh (263.000 cells - i have a volume of 100*100*70) when i use a finer mesh (650.000 cells) after few iteration a receive the following notice:

****** Notice ****** | | Newtons method failed to converge in 100 iterations. This | | occured while computing the following variable: | | | | Variable Name : Temperature | | Location Name : FluidZone | | Mesh location : VERTICES | | Mesh entity : | | Last 3 Changes : 8.96800E-02 1.79351E-01 8.96800E-02 | | Tolerance : 1.0000E-02 | | | | The Newton iteration was either slowly converging or has stalled. | | The solver will continue with the variable set as it was on the | | final iteration. If this situation continues you might try | | increasing the number of iterations allowed for Newtons method. | | This can be changed by setting one of the parameters: | | | | Temperature : "Constitutive Relation Iteration Limit" | | Pressure : "Newton Pressure Iteration Limit" | | | | for your mixture using the definition file editor. | +--------------------------------------------------------

and after several iterations:

ERROR #004100018 has occurred in subroutine FINMES. | | Message: | | Fatal overflow in linear solver. | +--------------------------------------------------------------------+

+--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The CFX-5 solver exited with return code 1. No results file has | | been created. | +-----------------------------------------------

Do you happend to know something about this and what do you mean by calulating reaction rate automatically?

Ioana

Rui March 2, 2005 11:14

Re: error creating a material
 
Hi Jeff,

Where did you find the information that STDENTR is Standard Entropy? I have searched the manual and there's nothing about STDENTR.

I'm asking this because I got an error message: ERROR #001100279 has occurred in subroutine ErrAction. Message: NAME_MOD: Error finding variable "SPHEATP_FL2"; and I can't find any information about what SPHEATP_FL2 means.

Thanks and regards,

Rui

Berny March 3, 2005 03:48

Re: error creating a material
 
I supppose SPHEATP is the specific heat at constant pressure. I suppose FL2 is one of your fluids.

Rui March 3, 2005 14:55

Re: error creating a material
 
Thanks Berny,

I suppose so. But if the Solver outputs messages with variables named SPHEATP_FL2, STDENTR, etc, their meaning should be on the manual, or anywhere else.

Regards,

Rui

Jeff March 4, 2005 11:16

Re: error creating a material
 
I have only deduced the meaning by looking at the materials I was using and seeing what was missing from the material in question.

I have used CFX-4 and CFX-5 for many years with chemical reactions. The Std. Entropy of formation for a component is required for calculating equilibrium chemical kinetic rates. It's used to minimize the Gibbs free energy equation. As far as I know, it isn't used for anything else. I get the "missing STDENTR" all the time, especially for my own materials that I've created and haven't specified the standard entropy. Some of the library materials don't specify Std. Entropy either. If I'm not doing equilibrium chemistry, I simply ignore it without any problems.

If one of the ANSYS guys knows any different, please correct my analysis of the situation.

Jeff

Neale March 9, 2005 22:27

Re: error creating a material
 
Jeff's response is correct.

This is printed because you have likely mixed a NASA Cp polynomial material with a non-NASA material. This might be inconsistent if the material you have added does not have the correct reference state (enthalpy, temperature and pressure) so be careful.

krishna Prasad March 26, 2005 06:27

Re: error creating a material
 
Please give me possible reasons and solutions respectively for the Error below

+--------------------------------------------------------------------+ | ERROR #004100018 has occurred in subroutine FINMES. | | Message: | | Fatal overflow in linear solver. | +--------------------------------------------------------------------+

+--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The CFX-5 solver exited with return code 1. No results file has | | been created. | +--------------------------------------------------------------------+

End of solution stage.

+--------------------------------------------------------------------+ This run of the CFX-5 Solver has finished.


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