Hi Liming, As far as I know, there are two methods to simulate the moving body, 1, use time-dependent mapping of coordinates; 2, add a MovingReferenceFrame body force and solve the absolute velocity in the body frame, examples are given in the latest master branch solvers/IncNavierStokesSolver/Tests/ Moving_reference_frame_Rot.xml, Moving_reference_frame.xml. Method 2 only works for a rigid body. Cheers Ankang ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of 朝黎明 <chaoliming@hit.edu.cn> Sent: 22 July 2021 10:53 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Question about the flow stability computation of a moving body This email from chaoliming@hit.edu.cn 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, Sorry for my interruption. I want to use Netkar++ to investigate the flow stability around a flapping plate. However, I found there are no tutorials about the moving body. Would someone kindly give me some suggestions or share your tutorials about the moving body? With best wishes! Li-Ming