Hi Reda, It is possible to adopt convective boundary conditions for quasi-3D simulations. The boundary conditions for the outflow boundary are specified as follows: <R VAR="u" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep"/> <R VAR="v" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep"/> <R VAR="w" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep"/> <R VAR="p" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="1.0/(D0*Kinvis)”/> The w-component being the same as u,v. Kind regards, Andrea Cassinelli PhD candidate Department of Aeronautics Imperial College London London SW7 2AZ Mob.: +44 (0)7956957642 On 11 Apr 2020, at 20:14, Moto Light <redamansyhh@gmail.com<mailto:redamansyhh@gmail.com>> wrote: This email from redamansyhh@gmail.com<mailto:redamansyhh@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. Hi All, First i wish all of you are fine and these bad days will past and you always be healthy, I am asking if I can implement convective boundary conditions in Quasi-3D simulations for my cases, for now i am using Robin boundary conditions for my 2D cases but still have a problem in Quasi-3D cases. any ideas for this outlet boundary conditions for my case I am using for 2D ---------------------------- <REGION REF="5"> <!-- Outlet --> <R VAR="u" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep" /> <R VAR="v" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep" /> <R VAR="p" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="1.0/(D0*Kinvis)" /> </REGION> -------------------- and for my Quasi-3D using -------------------------------------------- <REGION REF="5"> <!-- Outlet --> <N VAR="u" USERDEFINEDTYPE="HOutflow" VALUE="0" /> <N VAR="v" USERDEFINEDTYPE="HOutflow" VALUE="0" /> <N VAR="w" USERDEFINEDTYPE="HOutflow" VALUE="0" /> <D VAR="p" USERDEFINEDTYPE="HOutflow" VALUE="0" /> </REGION> --------------------------------------- is there any modifications in the new ver 5.0 regarding outlet boundary conditions? Thanks, Regards, Reda UPC Spain _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users