Dear Vishal, Hexahedra should work fine. It’s not immediately obvious what your issue is. Can you send me your session files so I can look into your issue? FYI, we also have a new NekMesh mailing list which this thread might be appropriate for. Cheers, Julian Marcon Research Assistant (Early Stage Researcher) Department of Aeronautics / Aerodynamics Section Imperial College London, City and Guilds Building, Room 420 London SW7 2AZ Mob.: +44 (0)7449 121911<tel:+447449121911> From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> On Behalf Of Vishal Saini Sent: 17 May 2018 14:56 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] curved elements and BL splitting Hi all, This is regarding NekMesh utility. I would like to mesh a pipe which has coarse elements to begin with (inlet cross section shown in figure). In order to make the outer surface smooth I applied "spherigons" which worked fine (see attached). However, when I try to use "boundary layer splitting", NekMesh says: No elements detected to split. The element type on the outer surface are hexahedra. Is it the problem? Can anyone suggest a way out? Cheers, Vishal