Physics-based simulation for fluid mixtures
Dongwoon Lee and Ken Jackson

We develop a physics-based particle method to simulate various fluid mixture effects. A particle method is chosen over a grid-based method because we believe a particle method is more intuitive and better suited  for handling physical and chemical interactions between fluids. Since a particle carries the physical attributes of the fluid (e.g, density and velocity), transfer of these attributes between particles can be computed easily using a particle method. Also, arbitrary shapes of the fluid mixture can be modeled based on the particles' spatial configuration, which is updated throughout the simulation.


Numerical Model
Smoothed particle hydrodynamics (SPH), ODE  


Experimental Results (not final version)
1. Diffusion
  (a) Blue liquid drops onto clear water. Blue one is heavier than water.  [side view]
  Both are immiscible (with no diffusion) Immiscible then mixable (with little diffusion) Mixable                                 (with more diffusion)  
  (b) Blue liquid drops onto clear water [top view]
  Immiscible (with no diffusion) Mixable (with diffusion)  
2. Chemical Reaction
  (a) Blue liquid and red liquid in the clear water [top view]
  Different diffusion rate                  (red one is slower than blue one) Same diffusion rate with chemical reaction  




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