Convection Term
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Hello Foamers,
I have modified the solver MRFInterFoam to solve the population balance equation via the Quadratic method of Moments. Now I would like to add the convection term (see attached file) m is a scalarField c1 and c2 are constants (scalars) First I tried this Equation, but I understand, that I can't calculate "scalar  tensor". Code:
fvScalarMatrix mEqn Code:
fvScalarMatrix mEqn Thanks for your help. 
Hi,
yes it is better. Don't forget to add the temporal derivative and the source term. Look at applications/solvers/basic/scalarTransportFoam. 
Thank you Thomas.
Do you mean something like that? Code:
solve 
Ok for the time derivative.
For the source term, it is not good. Ok, I assume your "c2" is a fixed variable. This way, you have 2 possibility: 1 use solve ( fvm::ddt(m) + fvm::div(phi, m)  fvm::laplacian(c1, m) == fvm::Su(c2f,m) ); ...where c2f can be declared after the m variable as follows: DimensionedField<scalar,volMesh> c2f ( IOobject ( "c2f", m.time().timeName(), m.mesh(), IOobject::NO_READ, IOobject::NO_WRITE ), m.mesh(), dimensionedScalar("c2f",m.dimensions()/dimTime,c2) ); 2 cleaner approach by using the fvOptions framework. Needs to write: solve ( fvm::ddt(m) + fvm::div(phi, m)  fvm::laplacian(c1, m) == fvOptions(m) ); In this approach, you need to define in the right way the fvOptions file located in the system file. Look at the tutorials to find the syntax you need. N.B : if c2 is not a fixed variable, the first approach is probably the simpler for first try (you could use the second one in combinaison of the codedFunctionObject) 
Thank you thomas its working

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