pub fn g2p_transfer(
particles: &mut [FlipParticle],
grid_new: &MacGrid,
grid_old: &MacGrid,
flip_ratio: f64,
)Expand description
Grid-to-Particle (G2P) transfer: update particle velocities from MAC grid.
flip_ratio in [0,1]: 1.0 = pure FLIP, 0.0 = pure PIC.