Hi Syavash, You should not need to convert the parallel file into a single file. Just run FieldConvert on the directory name FieldConvert file.fld out.plt The code automatically detects if it is a directory or file and reads the data accordingly. Cheers, Spencer. From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ehsan Asgari <eh.asgari@gmail.com> Date: Wednesday, 15 March 2023 at 06:12 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Reconstruct the parallel files into a single field This email from eh.asgari@gmail.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, I went through the user-guide to see how to convert the parallel files into a single field using FieldConvert. Unfortunately, I wasn't able to do it. Is there any specific command to do this? For example, I have 128 parallel fields inside a solution directory. I'd like to reconstruct them into a single file to post-process the solution. Kind regards syavash