RECORDED NATIVE FIELD RESPONSE

Pressure and wall shear.

One retained triangle obstacle supplies collision geometry, fluid volumes and shared openings to two explicitly bounded operators.

Saved native binary64 fields, checked against independent rational controls. The pressure projection has sealed stationary walls. The separate shear mode has invariant/periodic tangential directions, a stationary embedded lower wall and stationary upper wall. This is not a composed 3D fluid solver.

Remove a pressure gradient

Respond to force and wall friction

Compare fixed force density with fixed acceleration as density changes, or no-slip with finite Navier friction and free slip. Friction is not adhesion or contact-angle evolution.

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