[Getdp] normal component of gradient od scalar function

[Mengelkamp Judith TU Ilmenau]

Hello getDP-users,

in my current project I have to calculate the surface integral of the normal component of the gradient of the electric potential. How do I do this in getDP-formulation? Is there somewhere an example?

I searched on the internet and found that a BF_GradGroupOfNodes basis function with a OnOneSideOf group.

So my function space looks like (Domain_SC is a surface entity, Domain is the whole domain)

{ Name Hgrad_phi ; Type Form1 ;
    BasisFunction {
                { Name sn2 ; NameOfCoef phin2 ; Function BF_GradGroupOfNodes ;
        Support ElementsOf[Domain, OnOneSideOf Domain_SC] ; Entity NodesOf[Domain_SC] ; }
    }
    Constraint {
                  { NameOfCoef phin2 ; EntityType GroupsOfNodesOf ;
                  NameOfConstraint DirichletPhi2 ; }
    }
  }

With the constraint

{ Name DirichletPhi2 ; Type Assign;
    Case {
      { Region Domain_SC ; Value 0. ; }
    }
  }

And the formulation

Galerkin { [ sigma[] * Dof{d phi} , {phi} ] ; In Domain_SC ; Jacobian JVol ; Integration I1 ; }

However, the solution does not look satisfying to me.

Any held would be highly appreciated.

Thanks in advance,
Judith.


--------------------------------------------
M.Sc. Judith Mengelkamp

Technische Universität Ilmenau
Institut für Biomedizinische Technik und Informatik (Institute for Biomedical Engineering and Informatics)
Fachgebiet Biomedizinische Technik (Biomedical Engineering Group)

Phone: +49 3677 69-1958
Fax:       +49 3677 69-1311
e-mail:  judith.mengelkamp at tu-ilmenau.de

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