Hi Amit, It is possible to specify a .fld file as a boundary condition. In the past I have used RANS data. The process is that you need to extract the surface from your domain using Nekmesh with the -m extract module. You will need to specify the composite as an argument. I.e :surf=2 Once you have the surface you can get a set of x,y,z points from this surface using FieldConvert. You will then need to work out how to interpolate your data to these points. There is then a module to project the interpolated points back to a surface fld file. I do not recall this off the top of my head but it should be in the user guide. Having successfully generates a surface fld file you can then specify this in the xml boundary condition. Rather than using VALUE=“x*y” You can specify FILE=“myfile.fld” Cheers, Spencer Sent from my iPhone On 14 Feb 2019, at 02:03, Amitvikram Dutta <amitvdutta23@gmail.com<mailto:amitvdutta23@gmail.com>> wrote: Hi all, I'm re-asking a question I posed a few weeks ago since the email may have gotten lost in the clutter. Is it possible to add a non analytic profile to a boundary, if one does not have a .bc file. For example if One has experimental data on a series of points over a domain, would it be possible to interpolate that data to a boundary region of the mesh? Sincerely, -- Amitvikram Dutta Graduate Research Assistant Fluid Mechanics Research Lab Multi-Physics Interaction Lab University of Waterloo _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users