Hi Spen, Thanks for the tip. I was able to change boundary conditions to dirichlet to get around this. Good to know this! V ,-~~-.___._. / | ' \ | |--------. Vidhi Zala ( ) 0 | | | School of Computing \_/-, ,----' | | | Scientific Computing and Imaging Institute ==== !_!-v---v--. University of Utah / \-'~; .--------. / __/~| ._-""|| | 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 Sat, Mar 27, 2021 at 3:35 AM Sherwin, Spencer J <s.sherwin@imperial.ac.uk> wrote:

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> wrote:

This email from 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 =( _____|_|____||________| 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> 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 =( _____|_|____||________| 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>

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