The Shock Never Left the Starting Line — Where Conservative and Primitive Forms Split
·8 min read
Flux-form Burgers returns shock speed 0.5006. Writing velocity times a gradient returns 0.0000, and an eightfold grid still settles near 0.639.
Same Answer From 18% of the Cells — AMR Tagging Criteria and Coarse-Fine Refluxing
·9 min read
Wrapping a 256^2 shear layer in 3-level AMR leaves 11,776 cells, 18% of 65,536. Reflux off drifts mass by about 1% in 60 steps.