2D Navier-Stokes Flow

Controls

Clear Obstacle Vorticity View Velocity View Density View

Parameters

Viscosity: 0.0001 Diffusion: 0.0000 Force strength: 200 Vorticity confinement: 0.10

Stam's "stable fluids" (1999) uses semi-Lagrangian advection (backward tracing particle positions), Helmholtz decomposition to enforce incompressibility (divergence-free velocity field via pressure solve), and implicit diffusion — all unconditionally stable regardless of timestep. Vorticity confinement adds back fine-scale swirl lost to numerical dissipation.