[Onurozcan]

Hi all,

I have tried to make 3d cfd analysis in recuperator.

Outer side of tubes and other cad part (external flow) are contacted just outside of tubes.

That's why I have defined interface named selection.

But some problem has occured like could not correct face handedness for ... face ...

I need to do two faces in a zone.My friend advised me to do merge zones in TUI Command.

But error has happened like '' unable to merge zones ''

How can I resolve it?

Moreover these interface named selection have been changed ''wall'' and I have tried it again in TUI Command both by entering relevant ID number and by writing absolute named selection .The problem has still continued.

Can anyone let me know that problem?

Kind Regards,