Fluid Technuques

- variable density
- flow: vector field

- need: density (x), velocity (u), temperature(sometime)

- What affects it?
Viscosity, external force, advection, pressure

Computational fluid type:
-grid based/Eulerian(stable )
-particle based(weighted average give density, usually center at particle)
    - issue: need a lot of particle, difficult to get stable
-surface simulation
    - for water, all I care about is the boundary

-water velocity based on wave length.


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