Yes, you should have matching grid lines. 

Zhenlan


On Mon, May 19, 2014 at 8:42 PM, <nek5000-users@lists.mcs.anl.gov> wrote:
Dear neks
I am trying to merge two meshes as in ext_cyl example. Do the two meshes have to have matching grid lines for the merge to work ?
Thanks
praveen


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