[Eman Eal]

Howdy,

I am attempting to use OpenFoam for my research and need to solve a system with conjugate heat transfer and turbulance. As such I was doing this tutorial,

https://www.youtube.com/watch?v=Nhhm-ZPxVRc

unfortunately after finishing the tutorial I had an error which I haven't been able to resolve. The error is as follows.

--------------------------------------------------------------------------------------

--> FOAM Warning : Creating fvModels from "constant/fvOptions"



--> FOAM FATAL IO ERROR:
keyword type is undefined in dictionary "/home/don/Downloads/heatedDuct/constant/heater/fvOptions/options"

file: /home/don/Downloads/heatedDuct/constant/heater/fvOptions/options from line 22 to line 31.

From function const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, bool, bool) const
in file db/dictionary/dictionary.C at line 831.

FOAM exiting
-----------------------------------------------------------------------------------------

Which appears to be reference a mistake in the fvOptions file which contains inputs that define the heat generation in the heating element.

The file in question fvOptions is this,

-----------------------------------------------------------------------------------------
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 7
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant/heater";
object fvOptions;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

options
{
energySource
{
type scalarSemiImplicitSource;

timeStart 0;
duration 1;
selectionMode all;
volumeMode specific;

injectionRateSuSp
{
h (1e7 0); // W/m^3 == kg/m/s^3
}
}
}

// ************************************************** *********************** //

-----------------------------------------------------------------------------------------

This problem is cause because I am using version 10 while the tutorial was for a different version. The differences in the version are creating differences in how this file, and some others need to be set up. Unfortunately I haven't been able to figure out what is wrong with this.

Obviously I would like to know what is wrong with this code but mainly I am interested in how people look up the correct format for these input files, and the available options ect.
The best thing I have been able to find is the source code on the OpenFOAM website but it is rather complicated and my c++ isn't the best.

[überschwupper]

Hello,


fvModels and fvConstraints were introduced in OFv9 for fvOptions. Better use the actual standards, altough backwards compatibility is available in this case.


Source: https://github.com/OpenFOAM/OpenFOAM...0da43eb452c861


Your problem remembered me of one problem that I had some time ago. I faced the same error message. I cannot remember exactly what the solution was, but I used your code into my "template" maybe this will work for you.

in constant/fvModels

energySource
{
type            scalarSemiImplicitSource;
selectionMode all;
volumeMode specific;

injectionRateSuSp
{
name h;

timeStart 0;
duration 1;
selectionMode all;
explicit 10e7;
//implicit ;{}

}
}

Maybe this will work.


Regarding your question at the end. I always use the available doxygen on cpp.openfoam.org and the source code on github. Sometimes there are examples given, otherwise you have to look it up inside the source code. but most of the time, you will find good examples inside the tutorials or on this forum and then you only have to adjust to your case.

[Eman Eal]

Thank you for your reply and advice it was helpful and the problem is fixed.