Location for Boundary Condition Application

[McKenzie Davis]

Hello!

I'm interested in applying a non-homogeneous Dirichlet boundary condition to a specific edge. However, I'm unsure how to identify or specify a particular edge or face to add the boundary condition to. Could you help clear this up for me?

Thank you for your help,

McKenzie

[Daniel Arndt]

McKenzie,

I'm interested in applying a non-homogeneous Dirichlet boundary condition to a specific edge. However, I'm unsure how to identify or specify a particular edge or face to add the boundary condition to. Could you help clear this up for me?

What do you know about that particular edge? You can always ask faces or edges, e.g., about their midpoints. Have a look at https://www.dealii.org/current/doxygen/deal.II/step_6.html#Abettermesh.

Best,

Daniel

[Wolfgang Bangerth]

> <https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.dealii.org%2Fcurrent%2Fdoxygen%2Fdeal.II%2Fstep_6.html%23Abettermesh&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7C89baeb6e175e40c6c58b08d82f306f84%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637311232357310913&sdata=1Jamkij%2BSaxretqshK2UkkMRsRIDxzHVgFQIP5i1mFw%3D&reserved=0>.

And here:
https://github.com/bangerth/dealii/blob/66/examples/step-19/step-19.cc#L303-L317
for an example where I'm setting different boundary indicators depending on
the location of a face. These boundary conditions are then used when
interpolating different boundary conditions here:
https://github.com/bangerth/dealii/blob/66/examples/step-19/step-19.cc#L340-L354
This is eventually going to become step-19.

Best
W.
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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/