Dear Nandan, If I understood you correctly, you need to simply mirror your solution about the x-axis? What I would do is write out the current solution as a vtu, read it into Python, mirror it and write it out as csv. Finally, interpolate. That way you have a pipeline to apply any sort of modifications to your file. All the best, Guglielmo ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of nandan.sarkar@iitkgp.ac.in <nandan.sarkar@iitkgp.ac.in> Sent: 15 February 2023 04:35 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Invert results about a symmetric axis via post processing | 2D flow This email from nandan.sarkar@iitkgp.ac.in 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, I want to obtain a two-dimensional channel flow solution (y=-0.5 to 0.5) by simulating half of the channel (y=-0.5 to 0, with symmetry boundary conditions at y=0) in Nektar++. I have the resulting field file (.fld) of lower half channel but need to invert the same about the y=0 centerline to get the field of upper half channel and merge both to obtain full channel flow field. Can this be done in FieldConvert or some other Nektar++ tool? I need to use the full channel field as a restart condition for further purpose. Thank you in advance. Regards, Nandan Sarkar PhD candidate Dept. of Mechanical Engineering Indian Institute of Technology Kharagpur India 721302