Physics

FLIP Ratio

FLIP Ratio at 0 (viscous, PIC)

FLIP Ratio at 100 (chaotic, FLIP)

Blend between the "PIC" (smooth, damped) and "FLIP" (energetic, splashy) transfer modes, expressed 0 to 100 (default 90). Lower = more viscous; higher = more chaotic.

Over-Relaxation

Over-Relaxation at 100 (no acceleration)

Over-Relaxation at 200 (max acceleration)

Gauss-Seidel acceleration constant for the pressure solve, expressed 100 to 200 (default 190). Leave alone for most cases.

Pressure Iterations

Pressure Iterations at 10 (loose)

Pressure Iterations at 200 (tight)

How many times the pressure solver refines the velocity field per frame (10 to 200, default 30). Higher = more accurate, slower. Bump up if you see "squirting" through obstacles.

Pressure Solver

Pressure Solver: Gauss-Seidel

Pressure Solver: PCG

Gauss-Seidel (default, stable) or PCG (Preconditioned Conjugate Gradient, faster convergence, better for high grid resolutions).

Transfer Mode

Transfer Mode: Standard FLIP

Transfer Mode: APIC

Standard FLIP (default) or APIC (Affine Particle-In-Cell, preserves rotational motion better). Try APIC for vortexes and swirls.

Compensate Drift

Compensate Drift off

Compensate Drift on

Temporal density smoothing (checkbox, default on). Reduces resting-particle jitter by ~76%. Turn off only if you want a more "alive" look.

Separate Particles

Separate Particles off

Separate Particles on

Pushes overlapping particles apart every frame (checkbox, default on). Turn off for goopy / paint-like behavior.

Smoothing %

Smoothing at 0% (raw motion)

Smoothing at 100% (blended)

XSPH velocity smoothing (0 to 100%, default 0%). Blends each particle's velocity with its neighbors: higher = smoother flow, lower = more turbulent.

Damping %

Damping at 0 (no decay)

Damping at 10 (strong decay)

Velocity damping each frame (0 to 10, default 0.5). Gradually slows all particles down. Useful for stopping "perpetual motion" at long frame counts.

Surface Tension

Surface Tension at 0 (free)

Surface Tension at 500 (cohesive)

Pulls neighboring particles together (0 to 500, default 0). Higher values produce beads, droplets, or cohesive blobs.