adding temperature to simpleFoam
 

Hello,

Has any of you foamers added temperature to simpleFoam successfully?

Regards,

Carlos

Hi,

maybe this link helps you http://openfoamwiki.net/index.php/How_to_add_temperature_to_icoFoam

Thanks Elvis, I'm building it. It is taking me a while to understand how to implement the Temperature equation for a "steady state" for simpleFoam. I am making analogies with the buoyantBoussinesqSimpleFoam solver in a first step, but I am not sure.

Anyway, up to the 12th iteration I get an error message. If I make a step forward implementing simpleTempFoam, i'll post it here.

Thanks again,

Carlos

Hi,
Instead of implementing temperature yourself you could use rhoSimpleFoam. This solver has already the solution of the enthalpy equation included.
rgds
Bjorn

Hi Bjorn,

Is it possible to use water as heat transfer media in rhoSimpleFoam? I haven't been able to change perfectGas in the thermophysicalproperties file.

Ok, I did not realize that your problem had water as medium. So, you probably need to implement the temperature equation after all.

Have you by the way checked the thermomodel:
icoPolynomial Incompressible polynomial equation of state, e.g. for liquids
as indicated in the User Manual?

rgds
Bjorn

Hello everyone,

I m a relatively new foamer and I mostly work with simpleFoam. I wanted as well to add temperature calculation for my flow as Carlos, so I followed as Bjorn suggested the rhosimpleFoam solver and the instructions from OpenFoam Wiki on how to add temperature to IcoFoam. A lot of erros appeared at the first place but I managed to overcome them, builded the new solver with the temperature and no errors appear. I use Paraview for postprocessing and the problem is that U,p, nu (I work with non - Newtonian flow) is printed normally but I cannot see anywhere the T variable to select to view the results. Did anybody had that problem?I would appreciate any comments.

Kindly,

Nickolas

Also, in the past I have succesfully carried out the addition of temperature to icoFoam and Paraview gave me the results as suggested from OpenFoam Wiki about that subject.

Thanx

Hi Nickolas,

just a guess, but have you defined the scalarField for T with option "IOobject::AUTO_WRITE"?
Beside of that you can force T to be written out with:
near the end of your code.

Martin

Yes that is correct. Below I m sending the createFields.H file of my created solver:

Info << "Reading field p\n" << endl;
volScalarField p
(
IOobject
(
"p",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);

Info << "Reading field U\n" << endl;
volVectorField U
(
IOobject
(
"U",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);

//adding from here
Info<< "Reading field T\n" <<endl;
volScalarField T
(
IOobject
(
"T",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);
//to here

# include "createPhi.H"


label pRefCell = 0;
scalar pRefValue = 0.0;
setRefCell(p, mesh.solutionDict().subDict("SIMPLE"), pRefCell, pRefValue);


singlePhaseTransportModel laminarTransport(U, phi);


dimensionedScalar DT
(
mesh.solutionDict().subDict("SIMPLE").lookup("DT")
);


autoPtr<incompressible::RASModel> turbulence
(
incompressible::RASModel::New(U, phi, laminarTransport)




So besides that I can add at the end the line you suggested and leave the option IOobject::AUTO_WRITE the same?

The AUTO_WRITE option is fine, don't know why it doesn't work.

You can add the T.write() additionally, for example in your runTime loop:
or at the very end of your solver:
Martin

Martin,

First of all thanks a lot for the useful information.
I tried the method you told me but the problem still remains the same. So I found a similar solver to see if things work out, the solver is the buoyantBoussinesqSimpleFoam. I modified my simpleFoam solver to match with the Boussinesq one. Actually at Boussinesq there is already the code on how to add the temperature but I think in my case I dont implement it correct.

I'm attaching some of the files of the solver to check if I have done anything wrong. Please, I m open to any thoughts, comments!

Kindly,

Nickolas

Hi Nickolas,

in the attachment you find the reviewed solver and a test case.

I made two minor changes to your solver in createFields.H and TEqn.H, have a look at comments with "@ Nickolas:".

To run the test case use:
blockMesh
my_simpleFoam

You can run it in parallel, too. It's configured for 4 cpu cores.

Have fun

Martin

Hi Martin,

With your suggestions I was able to perform the simulations and the temperature was calculated! Thank you very much. I am now able to understand the code better. Nontheless, I need to validate my results with the theory to check if everythhing works ok, but for the time being the temperature field is plotted.

I have another question concerning the "relaxation factors" that I see in the "fvsolution" file. How these factors affect the results of the simulation and I would like to know if there any standard values. Does it have to do with the flow field (meaning Newtonian approximation, non - Newtonian approximation) or the mesh? Or is it just a short of numerical technique? I found OpenFOAM very interesting and I would like to learn as much as possible although I m not very strong at c++. Do you happen to know any books or internet sites for me to study regarding these matter?

Again thanks a lot for your comments!

Kindly,

Nickolas

Hi
I have taken this file to add Temperature to the simpleFoam solver, I have followed the the instructions in the openfom wiki, but I'm having an error.
Cheers.

Andres, /opt/ is a directory that can only be written to with administrator rights. If you compile the solver in your home directory all should be well.

Hi Anton, thanks for your answer. I have tried to compile the solver in home directory, but I get a new error. Sorry but I don´t have to much experience working with linux, so some instructions are dificult to follow.

Did you execute wclean before you tried to wmake again?

No, i haven´t executed wclean.

thanks!

Does readSIMPLEcontrols.H exist in "/opt/openfoam200/src/finiteVolume/lnInclude/"?