magstadyn_av_js0_3d.pro
Hello Dear Sirs!
Unfortunately, I have not found any forums where people discuss the use of the gmsh/getdp software package, so I decide to write here. If there are forums where I can communicate with experienced users of this product, please send me link.
There is a question about using gmsh/getdp for modeling problems related to the electromagnetic field (eddy current nondestructive testing of ferromagnetic products). Based on magstadyn_av_js0_3d.pro the problem was described(the exciting coil and the conducting object located in it). A-v formulation was used. The problem is solved presumably correctly, but there is a question that I could not answer.
The question concerns the last integral in the Equation section for Coulomb calibration, namely Galerkin { [ Dof{d xi}, {a} ] ; In Domain ; Jacobian Vol ; Integration II ; }.
Please tell me what is the meaning of this integral? I tried to change the basis functions to d{xi} or to d{v} (Galerkin { [ Dof{d xi}, {d xi} ] ;...), the problem stops being solved correctly. If I understand correctly in the case of using Coulomb calibration, the requirement div(A)=0 is added. After integrating by xi and applying Green's formula, we get the integral of (div(xia) – a d xi). If homogeneous Dirichlet boundary conditions are given for xi, then a* d xi remains. Where does Dof{d xi}, {a} come from?