Hi Zhaoyu, The WSS module can be used in 2.5D. You just need to make sure that the session file is set up with the homogeneous expansion and that the .fld you are using was generated with that session file. If you extract the corresponding surface to a separate .xml file, you can then use it to convert your extracted test-wss.fld to .dat or .vtu and inspect it with your post processing software of choice. Kind regards, Andrea Cassinelli PhD candidate Department of Aeronautics Imperial College London London SW7 2AZ Mob.: +44 (0)7956957642 On 19 May 2020, at 04:01, 王昭予 <clemden@sjtu.edu.cn<mailto:clemden@sjtu.edu.cn>> wrote: ******************* This email 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. ******************* Hi all, I wonder if the wss module (Computing the wall shear stress) in FieldConvert can be use in 2.5 simulations. The command line written in user-guide is FieldConvert -m wss:bnd=0:addnormals=1 test.xml test.fld test-wss.fld. However, in a 2.5 simulation like BL, the wall boundary is usually a line not a surface. When I want to compute the wall shear stress along the center line of a wall surface, something wrong may happen. So what can I do to solve the problem in a 2.5D simulation. Thank you for your kind attention and help. Many thanks, Zhaoyu Wang Shanghai Jiao Tong University _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users