Dear All, okay, let me define it in another way. Is there a possibility to define an output by user for example to calculate the norms or other variables and print them to the screen during simulation? Where is the best possibility to do so in the program-code? Thanks a lot for any help! Best Fabian Selbach ________________________________ Von: nektar-users-bounces@imperial.ac.uk [nektar-users-bounces@imperial.ac.uk]" im Auftrag von "Selbach, Fabian [fabian.selbach@student.uni-siegen.de] Gesendet: Donnerstag, 13. Oktober 2016 12:45 An: nektar-users@imperial.ac.uk Betreff: [Nektar-users] Output of L2 and LInf norms during simulation Dear Nektar++ community, I would like to know how it's possible to get the L2 and LInf norms during a simulation at every InfoStep and not only at the end of a simulation? Is there an easy way to do so? The postprocessing tool of fieldconvert just can do it at every CheckStep and to do so I will have to do it very often and I always need a chk.-file. Furthermore (maybe it's a bug) the postprocessing module "printfldnorms" of fieldconvert always compares to an exact solution of 0 and never to the given exact solution (but the ouput file of the solver itself compares the exact solution - so there is only a bug in the postprocessing tool). I hope I will get an answer. Thank you. Best regards Fabian Selbach