[ztdep]

I need to add the 3.0*dT/dz in to the right hand side of my equation.
I add the following term to my eq:
+2.0*fvc::grad(T).component(2)

but the error are :
error: ‘class Foam::tmp<Foam::GeometricField<Foam::Vector<double >, Foam::fvPatchField, Foam::volMesh> >’ has no member named ‘component’

how to resolve this problem

[joshwilliams]

I think it should be "2.0*fvc::grad(T).z()"

[ztdep]

Originally Posted by joshwilliams

I think it should be "2.0*fvc::grad(T).z()"

thanks, but i still get :

TEqn.H:13:43: error: ‘class Foam::tmp<Foam::GeometricField<Foam::Vector<double >, Foam::fvPatchField, Foam::volMesh> >’ has no member named ‘z’

what had happened. why it says no this member

[joshwilliams]

Maybe because it is a tmp field? Perhaps try

volVectorField gradT = fvc::grad(T);


and then:

+2.0 * gradT.z()

[ztdep]

Originally Posted by joshwilliams

Maybe because it is a tmp field? Perhaps try

volVectorField gradT = fvc::grad(T);


and then:

+2.0 * gradT.z()

gradT.component(2)

this one works. thank you very much for your help. but .z() still can't be recongnized.

[olesen]

There are no 'x(), y(), z()' methods defined for Field volVectorField etc. Would be nice, but absolutely horrible to implement since they would only be enabled if vector. Would need a whole bunch more methods xx(), xy(), etc for tensor.


Thus if you need to slice out a component, use the component() method. For better documentation, would normally write fld.component(vector::Z) for example.

[ztdep]

Originally Posted by joshwilliams

Maybe because it is a tmp field? Perhaps try

volVectorField gradT = fvc::grad(T);


and then:

+2.0 * gradT.z()

Dear friends:
I need to compute the "sqrt(T)*T" , how to programming this term. It seems the sqrt in openfoam doesn't support component-wise operations.

[joshwilliams]

I am pretty sure you just need to loop over all of the cells you want to calculate the sqrt() of.