Dear GetFem++ community,
Thank you very much for you attention.
I'm trying to implement a Heat transfer equation, and I successfully inserted in the model every single brick including the transient term, a part from the convection (or advection) term.
My variational form of this term would be \int T \textbf{v} \cdot \Nabla \xi (with \xi test function Test_T, and \textbf{v} a known vector field).
Let's make things easier and let me define the degrees of freedon as
>>dof=gf_mesh_fem_get(mf, 'nbdof');
and \textbf{v} as
>>vt=ones(dof, dof, 3).
My problem is the fact that, using the command
>>gf_model_set(md, 'add nonlinear generic assembly brick', mim, '(vt*T).Grad_test_T', -1);
with T Temperature as the unknown variable,
I receive the error
>>"Error in assembly string".
Could you help me understand what is happening here?
Thank you again,
Best wishes
DeMedici Y.