Spencer Thanks for your reply. In our simulation, the steady incompressible Navier Stokes solver is used for multiple outlets flow. And porous region in the simulation aims at adding extra resistance on each outlet. Regards, Bin. At 2016-02-28 06:24:54, "Sherwin, Spencer J" <s.sherwin@imperial.ac.uk> wrote: HI Bin, It is not quite clear to me which solver you are using int eh Nektar++ framework. The 1D pulse wave model or the Incompressible Navier Stokes? Regards, Spencer. On 26 Feb 2016, at 05:28, 张宾 <zh_bin913@126.com> wrote: Dear all We are using nektar to calculate multiple outlets flow problem, and porous region is required in the simulation. In my opinion, when the porous region is applied in computational domain, inertial resistance coefficients and viscous resistance coefficients should be set for the porous region. Is there any instructions that tell us how to set these two coefficients in Condition section of XML session file, or are there other ways to use porous region in nektar++? Best regards, Bin _______________________________________________ Nektar-users mailing list 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 +44 (0) 20 759 45052

Hi Bin, OK, it should mathematically be possible to set different direct stress conditions at different outflows. However I am not sure if this is very explicit in the steady incompressible Navierstokes solver since it might be that it is currently assuming that there are natural boundary condition along these outflows currently? Is this the issue? If so I can look to see how we can provide a means to set the traction condition directly from the input file and then you need a model to work out the outflow resistances? Regards, Spencer. On 29 Feb 2016, at 01:41, 张宾 <zh_bin913@126.com<mailto:zh_bin913@126.com>> wrote: Spencer Thanks for your reply. In our simulation, the steady incompressible Navier Stokes solver is used for 3D flow computational domain. And porous region in the simulation aims at adding extra resistance on outlets. Regards, Bin. At 2016-02-28 06:24:54, "Sherwin, Spencer J" <s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk>> wrote: HI Bin, It is not quite clear to me which solver you are using int eh Nektar++ framework. The 1D pulse wave model or the Incompressible Navier Stokes? Regards, Spencer. On 26 Feb 2016, at 05:28, 张宾 <zh_bin913@126.com<mailto:zh_bin913@126.com>> wrote: Dear all We are using nektar to calculate multiple outlets flow problem, and porous region is required in the simulation. In my opinion, when the porous region is applied in computational domain, inertial resistance coefficients and viscous resistance coefficients should be set for the porous region. Is there any instructions that tell us how to set these two coefficients in Condition section of XML session file, or are there other ways to use porous region in nektar++? Best regards, Bin _______________________________________________ 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 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