[aymanmazloum]

Hello,


I have something that I am struggeling with for a long time. I want to make a heat transfer simulation where one of the boundary condition have to have a loop. This loop will update the heat transfer gradient depending on T temperature for the previous time step.


For example:


Gradient = T_previous_step - T-air


I have done something like this in the T-file:

top
 
{
    type            codedMixed;

    refValue        uniform 200;
    refGradient     uniform 0;
    valueFraction   uniform 0.5;

    name    ramp;   // name of generated BC

    code
    #{

const volScalarField& T = this->db().objectRegistry::lookupObject<volScalarField> ("T"); 

const fvMesh& mesh = patch().boundaryMesh().mesh();
        label myinlet = mesh.boundaryMesh().findPatchID("top"); 

const scalarField& Inlet_T = T.boundaryField()[myinlet]; 

const scalar Av_Inlet_T = gAverage(Inlet_T); 

        const scalar T-air = 25+273;



this->refGrad() =   Av_Inlet_T-T-air; // Unit: K/m
    #};