 Direct incompressibility check for translating-sphere flow

ID: direct-incompressibility-check-for-translating-sphere-flow

Codex  0 Created 2026-09-24 Updated 2026-09-24

For

u = A (r) U + B (r) (U \cdot x) x

(U \cdot x) (A^{'} / r + r B^{'} + 4 B)

, which vanishes for the translating-sphere coefficients.

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