Reading parameters for ignition source from a dictionary

Delcraft · January 18, 2015, 08:17

Hello,

I would like to define an energy source (gaussian distribution in time and space) for the solver "reactingFoam" with parameters taken from a dictionary file. I created a file reading the source properties:

Code:

IOdictionary ignitionProperties
(
    IOobject
	(
    	    "ignitionProperties",
            runTime.constant(),
            mesh,
            IOobject::MUST_READ_IF_MODIFIED,
            IOobject::NO_WRITE
     )
);
    const wordList spotNames(ignitionProperties.toc());

    forAll(spotNames, i)
    {
        const word& spotName = spotNames[i];
        Info<< "Creating settings for ignition spot: " << spotName << endl;

        const dictionary& subDict = IgnitionProperties.subDict(spotName);
        dimensionedScalar eps_("eps", dimensionSet(1,2,-2,0,0,0,0), scalar(0.0));
        dimensionedScalar sigmas_("sigmas", dimensionSet(0,1,0,0,0,0,0), scalar(1.0));
        dimensionedScalar sigmat_("sigmat", dimensionSet(0,0,1,0,0,0,0), scalar(1.0));
        dimensionedScalar tmax_("tmax", dimensionSet(0,0,1,0,0,0,0), scalar(0.0));
        dimensionedVector location_("location", dimensionSet(0,1,0,0,0,0,0), vector(0.0 0.0 0.0));
        eps_ = subDict.lookup("eps");
        sigmas_ = subDict.lookup("sigmas");
        sigmat_ = subDict.lookup("sigmat");
        tmax_ = subDict.lookup("tmax");
        location_ = subdict.lookup("location");
        Info<< "eps = " << eps_ << endl;
        Info<< "sigmas = " << sigmas_ << endl;
        Info<< "sigmat = " << sigmat_ << endl;
        Info<< "tmax = " << tmax_ << endl;
        Info<< "location = " << location_ << endl;
    }

And after that I added such code for energy source in "EEqn.H":

Code:

#include "readIgnitionProps.H"
    volScalarField& xCoord = mesh.C().component(vector::X);
    volScalarField& yCoord = mesh.C().component(vector::Y);
    volScalarField& zCoord = mesh.C().component(vector::Z);
    volScalarField& dist;
    const scalar& PI = 3.1415926535;
    volScalarField& ST;
    volScalarField& he = thermo.he();

    fvScalarMatrix EEqn
    (
        fvm::ddt(rho, he) + mvConvection->fvmDiv(phi, he)
      + fvc::ddt(rho, K) + fvc::div(phi, K)
      + (
            he.name() == "e"
          ? fvc::div
            (
                fvc::absolute(phi/fvc::interpolate(rho), U),
                p,
                "div(phiv,p)"
            )
          : -dpdt
        )
      - fvm::laplacian(turbulence->alphaEff(), he)
     ==
        reaction->Sh()
      + fvOptions(rho, he)
      + ST
    );

    forAll(mesh.cells(), celli)
    {
        forAll(spotNames, i)
        {
            dist = sqrt(sqr(xCoord - location_.value().x())
                     + sqr(yCoord - location_.value().y())
                     + sqr(zCoord - location_.value().z()));
            ST += eps_/4/sqr(PI)/pow(sigmas_,3)/sigmat_
                    *exp(-0.5*sqr(dist/sigmas_))
                    *exp(-0.5*sqr((runTime.value() - tmax_)/sigmat_));
        }
    }

Unfortunately, I get an error when I compile the solver:

Code:

Making dependency list for source file ignitionFoam.C
SOURCE=ignitionFoam.C ;  g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3  -DNoRepository -ftemplate-depth-100 -I/opt/openfoam230/src/finiteVolume/lnInclude -I/opt/openfoam230/src/fvOptions/lnInclude -I/opt/openfoam230/src/meshTools/lnInclude -I/opt/openfoam230/src/sampling/lnInclude -I/opt/openfoam230/src/turbulenceModels/compressible/turbulenceModel -I/opt/openfoam230/src/thermophysicalModels/specie/lnInclude -I/opt/openfoam230/src/thermophysicalModels/reactionThermo/lnInclude -I/opt/openfoam230/src/thermophysicalModels/basic/lnInclude -I/opt/openfoam230/src/thermophysicalModels/chemistryModel/lnInclude -I/opt/openfoam230/src/ODE/lnInclude -I/opt/openfoam230/src/combustionModels/lnInclude -IlnInclude -I. -I/opt/openfoam230/src/OpenFOAM/lnInclude -I/opt/openfoam230/src/OSspecific/POSIX/lnInclude   -fPIC -c $SOURCE -o Make/linux64GccDPOpt/ignitionFoam.o
In file included from EEqn.H:2:0,
                 from ignitionFoam.C:76:
readIgnitionProps.H: In function ‘int main(int, char**)’:
readIgnitionProps.H:19:37: error: ‘IgnitionProperties’ was not declared in this scope
readIgnitionProps.H:29:21: error: ‘subdict’ was not declared in this scope
In file included from ignitionFoam.C:76:0:
EEqn.H:3:58: error: invalid initialization of non-const reference of type ‘Foam::volScalarField& {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&}’ from an rvalue of type ‘Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> >’
EEqn.H:4:58: error: invalid initialization of non-const reference of type ‘Foam::volScalarField& {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&}’ from an rvalue of type ‘Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> >’
EEqn.H:5:58: error: invalid initialization of non-const reference of type ‘Foam::volScalarField& {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&}’ from an rvalue of type ‘Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> >’
EEqn.H:6:21: error: ‘dist’ declared as reference but not initialized
EEqn.H:8:21: error: ‘ST’ declared as reference but not initialized
EEqn.H:36:38: error: ‘location_’ was not declared in this scope
EEqn.H:39:19: error: ‘eps_’ was not declared in this scope
EEqn.H:39:38: error: ‘sigmas_’ was not declared in this scope
EEqn.H:39:49: error: ‘sigmat_’ was not declared in this scope
EEqn.H:41:58: error: ‘tmax_’ was not declared in this scope
/opt/openfoam230/src/finiteVolume/lnInclude/readTimeControls.H:38:8: warning: unused variable ‘maxDeltaT’ [-Wunused-variable]
make: *** [Make/linux64GccDPOpt/ignitionFoam.o] Error 1

Could anyone tell me where should I place the link to the file "readIgnitionProps.H" to obtain the correct compilation of the code? Or maybe I made a principal mistake in other place?
Thanks for any help,

Delcraft

ssss · January 18, 2015, 09:39

Code:

const dictionary& subDict = IgnitionProperties.subDict(spotName);

Code:

location_ = subdict.lookup("location");

Should be

Code:

const dictionary& subDict = ignitionProperties.subDict(spotName);

Code:

location_ = subDict.lookup("location");

After that you should be careful, you are initializing variables inside a for loop

Code:

 forAll(spotNames, i)

so when you exit the for loop the variables will be destroyed and thus you get the EEqn.H:39:19: error: ‘eps_’ was not declared in this scope error, try to create them before the for loop

Delcraft · January 18, 2015, 11:00

Thank you ssss,

I've corrected these errors and now I have only problems with EEqn.H:

Code:

EEqn.H: In function ‘int main(int, char**)’:
EEqn.H:6:21: error: ‘dist’ declared as reference but not initialized
EEqn.H:8:21: error: ‘ST’ declared as reference but not initialized
EEqn.H:36:56: error: request for member ‘x’ in ‘location_.Foam::dimensioned<Type>::value [with Type = double]()’, which is of non-class type ‘double’
EEqn.H:37:55: error: request for member ‘y’ in ‘location_.Foam::dimensioned<Type>::value [with Type = double]()’, which is of non-class type ‘double’
EEqn.H:38:55: error: request for member ‘z’ in ‘location_.Foam::dimensioned<Type>::value [with Type = double]()’, which is of non-class type ‘double’

so consequently I have two questions:
1) How should I initialize variables "dist" and "ST", because the initialization like this:

Code:

    volScalarField& dist = 0.0;
    volScalarField& ST = 0.0;

doesn't work - in this case I have an error

Code:

error: invalid initialization of non-const reference of type ‘Foam::volScalarField& {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&}’ from an rvalue of type ‘double'

2) How to get a component from a vector? I'm trying to get it, for example, the component x as "location_.value().x()" but obviously I do it wrong.

ssss · January 18, 2015, 11:26

For 2) try:

Code:

location_.x()

For 1) try (the same with dist):

Code:

volScalarField ST=xCoord-xCoord;

It is a bit of a hack, but I'm not an expert of C++. Let me know if it works

Delcraft · January 18, 2015, 12:32

No, it doesn't. I think the main problem is I don't understand to which type of variable I should associate the values "dist" ( the distance from a mesh cell to the ignition point) and ST ( the source term itself) ☺

ssss · January 18, 2015, 13:45

Try then:

Code:

const volVectorField& centres = U.mesh.C().internalField();
volScalarField dist=mag(centres-location_);

It's a bit difficult to know what fails without the solver in hand.

Delcraft · January 21, 2015, 16:40

Hello,

I found a solution for my problem. It was necessary to create two scalar fields for the distance from mesh cell to ignition point and for the energy source and locate it in the file CreateFields.H. After that I created additional file with the source formulation and included it into EEqn.H (all necessary files are attached).

My second step is to permit to create several ignition sources in the domain, and at this step I can't understand how can I set the loop over all sources points for the mesh cells. I tried to do this by this way (in the file included to EEqn.H):

Code:

forAll(spotNames,i)
{
    ST += eps_/pow(sigmas_,3)/sigmat_/4/sqr(PI)*exp(-0.5*sqr(dist/sigmas_))
            *exp(-0.5*sqr((t - tmax_)/sigmat_));
}

where the energy source is summarized over all locations (spotNames, in my test there are two), but finally I got that all the energy is released in the second location.

Delcraft

Delcraft · January 21, 2015, 18:01

I've solved this problem too, just slightly modifying the code of the dictionary input (creating a pointer list instead of single variable, as in this thread - http://www.cfd-online.com/Forums/ope...ictionary.html):

Code:

const wordList spotNames(ignitionProperties.toc());
 
    PtrList<dimensionedScalar> eps_(spotNames.size());
    PtrList<dimensionedScalar> sigmas_(spotNames.size());
    PtrList<dimensionedScalar> sigmat_(spotNames.size());
    PtrList<dimensionedScalar> tmax_(spotNames.size());
    PtrList<dimensionedVector> location_(spotNames.size());
 
    forAll(spotNames, i)
    {
        const word& spotName = spotNames[i];
        const dictionary& subDict = ignitionProperties.subDict(spotName);
 
        eps_.set
        (
             i,
             new dimensionedScalar(subDict.lookup("eps"))
        );
        sigmas_.set
        (
             i,
             new dimensionedScalar(subDict.lookup("sigmas"))
        );
        sigmat_.set
        (
             i,
             new dimensionedScalar(subDict.lookup("sigmat"))
        );
        tmax_.set
        (
             i,
             new dimensionedScalar(subDict.lookup("tmax"))
        );
        location_.set
        (
             i,
             new dimensionedVector(subDict.lookup("location"))
        );
    }

and setting the loop over every source location:

Code:

forAll(spotNames,i)
{
        dist = mag(mesh.C() - location_[i]);
        ST += eps_[i]/pow(sigmas_[i],3)/sigmat_[i]/4/sqr(PI)*exp(-0.5*sqr(dist/sigmas_[i]))
                    *exp(-0.5*sqr((t - tmax_[i])/sigmat_[i]));
}

All is resolved, excuse me for so many words ))

January 18, 2015, 09:39		#2
ssss Senior Member anonymous Join Date: Aug 2014 Posts: 205 Rep Power: 13	Code: const dictionary& subDict = IgnitionProperties.subDict(spotName); Code: location_ = subdict.lookup("location"); Should be Code: const dictionary& subDict = ignitionProperties.subDict(spotName); Code: location_ = subDict.lookup("location"); After that you should be careful, you are initializing variables inside a for loop Code: forAll(spotNames, i) so when you exit the for loop the variables will be destroyed and thus you get the EEqn.H:39:19: error: ‘eps_’ was not declared in this scope error, try to create them before the for loop

January 18, 2015, 11:26		#4
ssss Senior Member anonymous Join Date: Aug 2014 Posts: 205 Rep Power: 13	For 2) try: Code: location_.x() For 1) try (the same with dist): Code: volScalarField ST=xCoord-xCoord; It is a bit of a hack, but I'm not an expert of C++. Let me know if it works

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January 18, 2015, 12:32		#5
Delcraft New Member Paul Join Date: Apr 2012 Posts: 27 Rep Power: 14	No, it doesn't. I think the main problem is I don't understand to which type of variable I should associate the values "dist" ( the distance from a mesh cell to the ignition point) and ST ( the source term itself) ☺

January 18, 2015, 13:45		#6
ssss Senior Member anonymous Join Date: Aug 2014 Posts: 205 Rep Power: 13	Try then: Code: const volVectorField& centres = U.mesh.C().internalField(); volScalarField dist=mag(centres-location_); It's a bit difficult to know what fails without the solver in hand.