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Boundary flux on degree-3 traces: per-slot DOF identity, true edge-node coordinates, and the consistent line mass (#459) #537

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Merged
lmoresi merged 2 commits into from
Aug 13, 2026
Merged

Boundary flux on degree-3 traces: per-slot DOF identity, true edge-node coordinates, and the consistent line mass (#459) #537

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57486fc
2D boundary flux: give every trace node its own coordinate — degree-3…
lmoresi Aug 13, 2026
4923dd9
Tests for #459: degree-sweep oracle, interior-node placement, collaps…
lmoresi Aug 13, 2026
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6 changes: 4 additions & 2 deletions src/underworld3/cython/petsc_generic_snes_solvers.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -3070,8 +3070,10 @@ class SolverBaseClass(uw_object):
``normal`` to get the scalar normal component :math:`\hat n\cdot\sigma\cdot\hat n`).

``mass`` de-smears the nodal reaction with ``"lumped"`` or ``"consistent"``
boundary mass. ``"auto"`` (default) selects lumped recovery for 2D traces and
3D P1 triangles, and the required consistent solve for 3D P2 triangles.
boundary mass. ``"auto"`` (default) selects lumped recovery for 2D P1/P2
traces and 3D P1 triangles, and the consistent solve for 3D P2 triangles and
2D traces of degree >= 3 (where row-sum lumping is respectively invalid and
only O(h) pointwise).
``remove_mean`` subtracts the boundary mean — leave ``False`` for a physical
flux (the mean is the Nusselt number); ``True`` gives a gauge-free field.

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