******************* 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 All I am doing a quasi 3-d simulation with a periodic direction in Z. When I use the "ReynoldsStresses" filter, I get a smooth time-averaged velocity, but I see the footprints of macro-elements on the Reynolds stress contours. I wonder why this can happen, as the Reynolds stresses are derived directly from the velocity and as far as I can tell, the representation of velocity contours is fine. Is there any reason that can explain this? Kind regards syavash