******************* 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. ******************* Dear Nektar++ team, I'm trying to obtain a time series of Reynolds stress. Is there any way to obtain a time series of field-averaged Reynolds stress, or even just at a few specific points? I am currently working with Nektar++ version 5.6.0. However, I am also interested in solutions available in the latest version. I've attempted the following two methods: 1. I tried using the 'history point' filter, but it only outputs variables defined in my session.xml file, specifically uvwp. Is Reynolds stress a predefined variable in Nektar++? Is it possible to define custom variables, such as u'v'? 2. I also tried outputting averaged fields at a high frequency and then post-processing them into a time series. However, this approach leads to enormous disk space occupation, exceeding my authorized storage limit. Is there a more elegant or efficient way to achieve my goal? Best regards, Boning P.S I'm current working on Nektar++ 5.6.0, but I'd like to know solutions for latest version, if there is any.