HI Shujie, Dave has been off for a bit and Julian is now working at NASA so not sure if anyone has been able to respond to this. Is this the compressible flow solver you are using with DG? Typically the DG code manages mesh expansion better than the CG where we need to use the DGKernel-SVV to control this type of feature. It might be that increasing the quadrature order could help if you are just using the default setting. I am afraid I cannot comment on the mesh expansion point but perhaps email Dave directly about that. Cheers, Spencer. On 11 Mar 2021, at 02:46, Shujie Jiang <Shujie.Jiang@soton.ac.uk<mailto:Shujie.Jiang@soton.ac.uk>> wrote: This email from Shujie.Jiang@soton.ac.uk<mailto:Shujie.Jiang@soton.ac.uk> originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Dear Nektar users, I am using NekMesh to generate mesh for my simulation. I found some reflection on the edge of the coarse mesh and the refine mesh (like the picture below). <image.png><image.png> Can I control the growth rate of mesh to give a smooth transition from a refined mesh to a coarse mesh? Thank you very much! Kind regards, Shujie University of southampton _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users