HI Daiane, This is implemented and is the <R> flag in the boundary conditions. There is an example of the input format in section 6.4.2.2. in the user guide which might be of help. Cheers, Spencer. On 26 Sep 2017, at 04:27, Daiane Iglesia Dolci <daia.dolci@gmail.com<mailto:daia.dolci@gmail.com>> wrote: Dear all, I need apply a mixed boundary condition of the Robin type. Is it possible employ this boundary condition using the Nektar++? Best regards, Daiane I. Dolci _______________________________________________ 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 FREng, FRAeS 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