Christian Svensson 8201f9a954 docs: a flow-past gallery clip and solved still ...

Add the start-up-transient clip and a solved still of the flow-past sample to
the examples gallery: air flowing past the L-bracket, the wake forming behind
the upright and the drag settling over the 16 s run (it does not shed; that
needs a finer grid or a collision operator stable near the lattice's stability
limit, #557).

tools/flow-clip/make.py regenerates them: it drives the desktop app over the
control channel, solves the lattice Boltzmann step with a dense frame output,
renders the model-only viewport at each frame with a fixed legend clamp
(results.frame then ui.render), and encodes an MP4 and a GIF with ffmpeg, each
frame captioned with the elapsed flow time. The geometry is the sample's own
upright-bracket recipe; nothing comes from a commercial product.

Part of #164.

2026-10-18 10:15:45 -04:00

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