[eng.nassim]

have I to use the same numbers of nodes on the tow adjacent interfaces

[Amir]

Hi nassim,
the main goal of using interfaces is that you can use different node numbers on them for numerical effort saving!

[eng.nassim]

hi Amir thanks for your reply I'm working on simulation of VAWT and I'm facing many problems , the solution is not convrged , not stable , although I'v tried many meshes.
I'm using the interrfaces to regognise the moving zone in my domine

[Amir]

Hi Nassim,
if you upload your grid and procedures, I may help you.