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- - **Error in solving bdivbFunction**
(*https://www.cfd-online.com/Forums/openfoam-solving/59625-error-solving-bdivbfunction.html*)

Hi All!
I'm new at OpenFOAM.Hi All!
I'm new at OpenFOAM. I try to solve the dimensionless Poisson-Equation. First I tried: solve( Gamma*(fvm::div(diag(fvc::grad(Phin)*Vektor))))+fv m::div(diag(fvc::grad(Pha)*Vek tor))==-Psi*(C1*z1+C2*z2) ); This didn't work because the 'diag'-Function ist not available.(I found information about that in the forum: Thanks). By the way, Vektor=(1 0 1/eq), where eq is a constant value. So, I splitted the equation and defined volTensorFields: volTensorField T1=(fvc::grad(Phin))*Vektor; volTensorField T2=(fvc::grad(Pha))*Vektor; To get a vector of the diagonal components I used the .component-Function.(Thanks again to the Forum.) Term1.component(vector::X)=T1.component(tensor::XX ); Term1.component(vector::Y)=T1.component(tensor::YY ); Term1.component(vector::Z)=T1.component(tensor::ZZ ); Same procedure for Term2 from T2. Then I defined volVectorField a=Term1; volVectorField b=Term2; Then I tried to solve the equation solve( Gamma*fvm::div(a)+fvm::div(b)==-Psi*(C1*z1+C2*z2) ); This produced: error:no matching function for call to 'div(Foam::volVectorField&)' With 'fvc' instead of 'fvm' it is: error:no match for 'operator=='in Foam::operator+(... Sorry, for the long explanation. Has anybody an idea what's wrong and how to solve this? I would be greatful for help. Bettina |

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