Coils for cooktop

Hello,

I am in the process of optimization of an inductor Cooktop (magnetic field distribution and proximity effect (for losses)).
However, I would like to know the method to be able to correctly simulate this assembly (ferrites & coil).

. 20 turns of twisted wires (50 wires with a complete turn every 10 cm).
. 6 ferrite 15cm x 1cm.

I have no problem to build the model with a single cable but I don't know how to define 50 twisted wires every 10 cm ?

In advance, thanks you