******************* 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. ******************* Hello Nectar++ users, I am analyzing the dispersion of a solute in an incompressible, laminar flow with a low Reynolds number using the IncNavierStokes solver with passive scalar transport. I've adapted the model from the Backward-facing step <https://doc.nektar.info/tutorials/latest/flow-stability/bfs/flow-stability-bfs.html> tutorial with an additional infusion point in the upper region of the channel, particularly within the step region. However, I've encountered negative concentration values in simulations. To address this, I activated SVV True (second test), although I had a slight reduction in negative concentration regions. I also conducted mesh refinement (third test), which improved the situation but significantly increased computational costs. If possible, I would appreciate any suggestions and, additionally, I would like to know more about SVV. Thank you in advance. Best regards, Tainá Gomes Rodovalho P.S.: Attached are the concentration images for the tests performed.
