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CelerisLab/research/fine_surface_joint_20261014/incremental.diff

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--- a/src/CelerisLab/lbm/refinement_stepper.py
+++ b/src/CelerisLab/lbm/refinement_stepper.py
@@ -39,6 +39,7 @@
velocities are in coarse lattice units (dx=dt=1). Independent local copies
are projected at fine cell centers. Their complete stencil must be active
and disjoint from the actual two-hop transfer footprint.
+ These use the edge/cell-center frame (coarse centers I+.5), whereas ordinary Simulation objects use the integer-node frame.
``initialize(coarse_g, fine_g)`` accepts physical Q-major (9,ny,nx) arrays
already in postcollision phase. It does not collide or build channel flags.