One flow. Connected through depth.
A 3D pressure correction couples all XY sheets. Water can move across the stack (W ≠ 0): one canvas shows in-plane arrows and perpendicular-flow signs, while another shows how that cross-plane motion changes with depth. The numerical solver runs locally.
AMBER DOT = +Z · CYAN RING = −Z
AMBER = +Z · CYAN = −Z · DARK = ~0
The calculations pull their own dependencies.
Implemented: non-dimensional 3D staggered-grid momentum (u, v, w), global pressure projection for incompressibility, impermeable walls, asymmetric bottom heating, buoyancy, 3D scalar advection and diffusion, pressure residual and mass-balance diagnostics. Every XY slice is a view into the coupled volume, not an independent simulation. Computation runs inside one local Web Worker.
Limitations: experimental coarse-grid scheme with approximate tangential no-slip, no interior membrane solid masks, no mesh-convergence study, no external benchmark certification, no compressibility. The adaptive pressure-correction gear chooses iterations; all physically coupled cells must still update. This is not a proof of the Navier–Stokes Millennium Problem.