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preconditioner="fmg" is inert on the semi-Lagrangian solvers: their solve() pre-runs setup and skips the base _build resolution

Status: Open.

#683 In underworldcode/underworld3;

· lmoresi opened on Sep 4, 2026

SLCN trace-back gives a partition-dependent answer (1.6% at np=8 on a 128x128 level set)

bugSomething isn't workingSomething isn't working

Status: Open.

#682 In underworldcode/underworld3;

· lmoresi opened on Sep 3, 2026

Passive swarm save/advection hangs or crashes on empty MPI ranks

Status: Open.

#679 In underworldcode/underworld3;

· bknight1 opened on Sep 3, 2026

The co-located multigrid tail fails at np=3 on the 3-D width network: a Galerkin coarse operator with a missing diagonal, and a 10% slip error

Status: Open.

#671 In underworldcode/underworld3;

· lmoresi opened on Sep 2, 2026

Placement gathers far more than the surgery needs, onto one rank for the whole network, and never sends it back

Status: Open.

#670 In underworldcode/underworld3;

· lmoresi opened on Sep 2, 2026

visualisation.initialise crashes headless lean environments (ImportError uncaught)

Status: Open.

#665 In underworldcode/underworld3;

· lmoresi opened on Sep 1, 2026

test_0053_hang_watchdog crashes its xdist worker intermittently (1 in ~15 CI runs)

Status: Open.

#661 In underworldcode/underworld3;

· lmoresi opened on Aug 28, 2026

SUPG and Levelset

enhancementNew feature or requestNew feature or request

Status: Open.

Feature

#657 In underworldcode/underworld3;

· NengLu opened on Aug 27, 2026

Stokes_Constrained: consolidated state of the open work (supersedes #244, #248, #254, #495)

Status: Open.

#651 In underworldcode/underworld3;

· lmoresi opened on Aug 26, 2026

geoid harmonic projection re-derives the surface mesh with ConvexHull instead of integrating over the boundary facets we already have

Status: Open.

#647 In underworldcode/underworld3;

· lmoresi opened on Aug 26, 2026

Document long HDF5 path failures in parallel PETSc output

bugSomething isn't workingSomething isn't working

documentationImprovements or additions to documentationImprovements or additions to documentation

type:documentationDocumentation reviewDocumentation review

Status: Open.

#645 In underworldcode/underworld3;

· gthyagi opened on Aug 25, 2026

uw.Params silently ignores negative CLI values (-uw_x -1 falls back to the default)

Status: Open.

#642 In underworldcode/underworld3;

· lmoresi opened on Aug 25, 2026