Thanks Freddie for the input. I was able to project the results onto a globally continuous basis and the PSD results look good.
BR, Vishal --- *Vishal SAINI* Master of Research, University of Cambridge. Master in Turbulence EC Lille, ENSIP and ENSMA France. Contact: [email protected], [email protected] <[email protected]> (+44) 7 459 186 139 (UK) (+33) 7 58 24 84 02 (France) On Tue, Aug 14, 2018 at 2:54 PM, Freddie Witherden <[email protected]> wrote: > Hi, > > On 10/08/2018 19:15, Vishal Saini wrote: > >> Is there a "filter" that can render C0 continuous data from PyFR output >> (that is by definition discontinuous at the elements). >> >> Why? I'm trying to calculate PSD in space for Taylor-Green Vortex case >> and there occur peaks on wave-numbers corresponding to the element size. >> Kindly suggest if someone has some other solution. I've already tried >> Paraview's CleantoGrid filter, but no help in this case. >> > > So the clean to grid filter will eliminate -- albeit somewhat arbitrarily > -- the multi-valued nature of the solution at the interfaces between > elements. The result should be C0 continuous. > > However, this will probably not resolve your issue. Indeed, it is perhaps > worth asking if those peaks you observe in the PSD are really spurious. > After all, when the solver 'runs' it is not working to actively eliminate > these effects and so -- at some level -- they are really there in the > simulation. Of course, they're numerical artefacts, albeit ones which can > have a meaningful effect on the subsequent dynamics of the simulation. > > If you do want to get a 'clean' result your best bet is probably to > construct a global basis (which given the test case is relatively simple) > and then project the solution onto this basis. > > Regards, Freddie. > > -- > You received this message because you are subscribed to the Google Groups > "PyFR Mailing List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send an email to [email protected]. > > Visit this group at https://groups.google.com/group/pyfrmailinglist. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "PyFR Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. Visit this group at https://groups.google.com/group/pyfrmailinglist. For more options, visit https://groups.google.com/d/optout.
