******************* 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. ******************* Hi all, I'm working on a stability and dynamics analysis of a high Re folw past a slender blunt-based axisymmetric body by the IncNavierStokesSolver, then I need to set an angle of attack for the flow.So I set the inflow surface boundary condition by defining its velocity component, and it works well.My question is about the corresponding outflow boundary conditions, if i remain it as the 0-AOA conditions, the streamlines near the outlet surface will become wrong curves. And I tried several definitions of the outflow surface but it always failed.So I'm wondering how to write the outflow boundary conditions with an AOA, I'm really confused。Thanks for your kind attention and help. Many thanks, Zehua Yue Beihang University