Dear Kamil, The output routines interpolate the data onto an equispaced grid for better visualising. However when solving the PDE we do indeed use the GLL points. Cheers, Spencer. On 18 Sep 2014, at 09:21, Kamil Ozden <kamil.ozden.me@gmail.com<mailto:kamil.ozden.me@gmail.com>> wrote: Dear All, When I specify my expansion type as GLL_LAGRANGE or GLL_LAGRANGE_SEM, I see in the grid that the spectral elements are divided in an equispaced way. As far as I know, for GLL expansions the grid should be divided as getting finer through the edges. Is there any other way that Nektar++ handles this issue? Regards, Kamil _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Spencer Sherwin McLaren Racing/Royal Academy of Engineering Research Chair, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> +44 (0) 20 759 45052