[boffin5]

Hi,


This problem concerns a vehicle body with a heated radiator in a duct. I got it working in OF8 with the generous help of the members of this forum.


Now, I am trying to get it to run in OpenFOAM 9. Apparently, many of the changes in OF9 concern heat transfer, so I am putting myself through the wringer.


Of course it fails; the error output is in the attached file 'run-error.txt'.
The place where it actually suffers death throes is here:

Creating fvModels from "constant/fvModels"

Selecting finite volume model type fixedTemperatureConstraint
[0] [1] 
[1] 
[1] --> FOAM FATAL IO ERROR: 
[1] Unknown fvModel fixedTemperatureConstraint

Valid fvModels are:

23
(
accelerationSource
actuationDiskSource
buoyancyEnergy
buoyancyForce
coded
effectivenessHeatExchangerSource
explicitPorositySource
heatSource
heatTransfer
interRegionExplicitPorositySource
interRegionHeatTransfer
isotropicDamping
massSource
phaseLimitStabilisation
radialActuationDiskSource
radiation
rotorDisk
semiImplicitSource
sixDoFAccelerationSource
solidEquilibriumEnergySource
solidificationMeltingSource
verticalDamping
volumeFractionSource
)

Now, in OF9, fvOptions is no longer used, but seems to have been replaced by fvModels. However, the format is quite different, and what is especially confounding is that, in the OF9 tutorials is a case called coolingSphere, and in the templates/constant/solid folder is the fvModels file, with this text:

FoamFile
{
    format      ascii;
    class       dictionary;
    object      fvModels;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

/*
fixedTemperature
{
    type            fixedTemperatureConstraint;
    selectionMode   all;

    mode            uniform;

    temperature     constant 300; // Set temperature (K)
}
*/

/*
fixedPower
{
    type            heatSource;
    selectionMode   all;

    Q               100;          // Set power (W)
}
*/

I just kept the part with 'fixedTemperature' as that should set the temperature of my radiator. And as you can see, it has the term 'fixedTemperatureConstraint', which the error output says is an unknown term!


I am hoping for insights as to this problem, and maybe even an explanation of the structural differences for this type of case, between OF8 and OF9.


Thanks again, community!

[ajithnair]

share the case setup or the fvModel file. will check what might be the problem

[Almanzo2000]

In OpenFOAM v9 all fixed constraints are defined in fvConstraint.

It's one of the changes from OF8 to OF9, the fvOptions are separated into two parts which are fvModels and fvConstraint.

If I'm not wrong fvConstraint is located in the system directory and the fvModels is located in the constant directory.