Hi, I am cc’ing Yan to help explain what these values do since he introduced them. However I believe they are set in the PARAMETERS section. They were introduced for moving frame of reference where you have to be careful for what is defined as inflow and outflow. However they do also have default values and in general do not need to be set. Cheers, Spencer. On 15 Dec 2016, at 14:30, Fer Mellibovsky <fernando.mellibovsky@upc.edu<mailto:fernando.mellibovsky@upc.edu>> wrote: Hi, Where and how are the "OutflowBC_theta", "OutflowBC_alpha1" and "OutflowBC_alpha2" specified? Is it within the "BOUNDARYCONDITIONS" section? If so, do the wanted values have to be repeatedly assigned for all fields within the outflow region? Or are they rather specified within the "PARAMETERS" section and are therefore common to all HOutflow BC? Many thanks Cheers On 09/12/16 10:25, Sherwin, Spencer J wrote: Hi, Just a quick note to highlight that we have now merged into Master a branch for high order outflow boundary condition on the incompressible Navier Stokes problems. This merge now supports the “convective like” outflow conditions proposed by Steve Dong (JCP 2015). It also allows for a slightly modified version of the velocity correction scheme where we formulate the pressure as a weak problem rather than starting from the strong form of the pressure Poisson problem. This is also consistent with the work of Guermond & Shen on these scheme. I have tried to motivate both of these modifications by restructuring the description of the method in the user guide. Cheers, Spencer. Spencer Sherwin McLaren Racing/Royal Academy of Engineering Research Chair, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> +44 (0) 20 759 45052 _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Spencer Sherwin McLaren Racing/Royal Academy of Engineering Research Chair, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> +44 (0) 20 759 45052