Hi Syavash, You could use FieldConvert -m gradient on the time-averaged fields. Regards, Chi Hin Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ehsan Asgari <eh.asgari@gmail.com> Sent: Saturday, June 17, 2023 8:20:29 PM To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Time-average of a gradient 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, How may I calculate the time-average of a gradient, for example velocity gradient? Kind regards syavash