Module fluid 

Eulerian grid-based fluid simulation (velocity + pressure + density).

Implements a simplified Navier-Stokes solver on a regular 2D grid using:

• Semi-Lagrangian advection (backtracing)
• Gauss-Seidel pressure projection (incompressibility)
• Vorticity confinement for turbulence detail
• Density/color field advection for visual smoke/fluid

Grid coordinates are cell-centered. Velocity is stored at cell centers (MAC grid variant not required for this simulation scale).

Quick Start

use proof_engine::physics::fluid::FluidGrid;
let mut fluid = FluidGrid::new(64, 64, 1.0 / 64.0);
fluid.add_velocity(32, 32, 0.0, 5.0);
fluid.add_density(32, 32, 1.0);
fluid.step(0.016);

Structs

FluidFrame

A single snapshot of the fluid state.

FluidGrid

2D Eulerian fluid simulation grid.

FluidParams

Preset fluid simulation configurations.

FluidRecorder

Records fluid grid frames for replay or analysis.