Hi Vidhi, Did you get this sorted. I suspect you need to use the peralign option which ensures periodic composites have the elements ordered in a consistent manner and triangular faces are aligned so that the singular vertex is pointing in the same direction. Cheers, Spencer. On 16 Mar 2021, at 18:53, Vidhi Zala <vidhi.zala@utah.edu<mailto:vidhi.zala@utah.edu>> wrote: This email from vidhi.zala@utah.edu<mailto:vidhi.zala@utah.edu> originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hi all, Sorry, here is the user-guide section screenshot. V ,-~~-.___._. / | ' \ | |--------. Vidhi Zala ( ) 0 | | | School of Computing \_/-, ,----' | | | Scientific Computing and Imaging Institute ==== !_!-v---v--. University of Utah / \-'~; .--------. / __/~| ._-""|| | vidhi.zala@utah.edu<mailto:vidhi.zala@utah.edu> =( _____|_|____||________| http://sci.utah.edu/people/vidhi.html I support Ruff Haven Crises Shelter for Homeless Pets<https://www.ruffhaven.org/donate>. Consider a donation today :) On Tue, Mar 16, 2021 at 12:53 PM Vidhi Zala <vidhi.zala@utah.edu<mailto:vidhi.zala@utah.edu>> wrote: Hi everyone, I am trying to implement a 3D advection example on a cube with composite elements (hex+tets+pyramids+quads+tri). I am using periodic boundary conditions. I am getting the following error: "Unable to determine face orientation". I referred to the relevant section of user guide (please see screenshot). I am unable to understand how should I change the rotation argument such that I can simulate a periodic flow. It would really help if I get some more details about this. Many thanks, V ,-~~-.___._. / | ' \ | |--------. Vidhi Zala ( ) 0 | | | School of Computing \_/-, ,----' | | | Scientific Computing and Imaging Institute ==== !_!-v---v--. University of Utah / \-'~; .--------. / __/~| ._-""|| | vidhi.zala@utah.edu<mailto:vidhi.zala@utah.edu> =( _____|_|____||________| http://sci.utah.edu/people/vidhi.html I support Ruff Haven Crises Shelter for Homeless Pets<https://www.ruffhaven.org/donate>. Consider a donation today :) <Screen Shot 2021-03-16 at 12.49.38 PM.png>_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users