Please provide a description of the problem your changes address. Be sure to link to any related items in the issue tracker.
Generally, the no-slip condition should be satisfied on the solid wall. For hydrophobic materials, however, partial slip on the wall is allowed. This merge request added an implementation of a partial slip boundary condition with a constant slip length.
This merge request is also a preparation for the wall model branch !1266
A summary of the proposed changes and how they address the issue/feature at hand. Whenever possible, describe alternatives your considered and decisions you made.
The partial-slipe model is set as a Dirichlet-type boundary condition, where the boundary velocity equals the multiplication of the slip length and wall-normal velocity gradient. The slip length is specified in the boundary condition.
A more detailed description of the changes. Please include any details necessary for reviewers to understand your work, and point out particular points would like them to pay particular attention to.
A function EvaluateWallModeledVelocityBCs is added to evaluate the wall velocity in the partial-slip boundary condition.
Please add any other information that could be useful for reviewers.
Functions and classes, or changes to them, are documented.
User guide/documentation is updated.
Changelog is updated.
Suitable tests added for new functionality.
Newly added files are correctly formatted.
License added to any new files.
No extraneous files have been added (e.g. compiler output or test data files).