Hi Shan, Certainly with continuous Galerkin method you can avoid the checker boarding effect by using a Taylor Hood element where the pressure space is one order lower than the velocity space. I think there is an example of how to set this up in the user-guide. We tend to use this combination at higher Re numbers where we do otherwise observe problems. For DG spaces I think you might need to use a P - (P-2) space where the pressure is two orders lower than the velocity. Cheers, Spencer. On 28 Jun 2022, at 17:39, shan xiangjun <x_j_shan@outlook.com<mailto:x_j_shan@outlook.com>> wrote: This email from x_j_shan@outlook.com<mailto:x_j_shan@outlook.com> 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 all: When the continuous or discontinuous Galerkin method is used to solve the incompressible N-S equation, can the “checkerboarding” of the pressure field be avoided if the LBB (or inf-sup) condition is satisfied? Can anyone help me? Thank you very much. Best regards, Shan 从 Windows 版邮件<https://go.microsoft.com/fwlink/?LinkId=550986>发送 _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users