B4F: A3ROFL0W

Body color Body surface Smoke transparency 40%

Speed colormap

Trace width 40%

Thin path overlay (with smoke)

Show 2D LBM plane (XY · flow +X)

Section slice (|U|)

Slice orientation Slice angle (around flow) 0° Slice position (along flow) 50%

Lattice-Boltzmann — 2D slice

2D mask from half

Re (target) 80 Time steps 12000 Ellipse a 10 Ellipse b 7 2D heatmap

Switch to Streamlines & mesh (3D) to load a model, then run LBM or preview the mask.

Heatmap: |U| or solver pressure (p = ρc_s², D2Q9 lattice units) from 2D LBM (flow +X). With a loaded mesh, lattice size follows the XY footprint (default long side ≈768 cells, up to 1024); the obstacle mask (Z-slice rasterization) is built on first Preview mesh mask or Run 2D simulation here — 3D upload only aligns geometry for streamlines. Re-upload after API updates to refresh the mask. Thinner parts need enough cells on the short axis — the old 256 cap on height often made wings one pixel wide. Runtime grows with cells × time steps; lower Time steps for previews. Install numba for faster LBM (see backend/requirements.txt).