coil design

Hello,

I work on a cold crucible magnetic modelisation with the mf physic around 10 kHz.
I want to design a 2 turns coil according to the real geometry (with little simplifications). I start with a 3D quarter of the real design (symetry axis) but I can't represent a quarter 2 turns coil (there is no coil group option like in 2D-axy; for defining 2 turns in series configuration).
With a quarter of the real design it's work well, but simulation are done with only one turn.
I think that I need to design all the geometry in order to define the 2 turn coil and have external boundaries to put a voltage on single turn coil domain.
I do this but I have always convergence issue "Divergence of the linear iterations".
I try the boundary single turn coil option (the coil is just a surface where it is possible to assign a coil thickness) with no more success. It converge but results are completly different in fonction of the mesh I use.
Anyone have an idea for design this coil or tips for meshing such a structure?

(I can't use lumped port due to the geometry of the coil as it is done in the inductor 3D tutorial)

Thank you for your help