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Hagit Schechter and Robert Bridson
The University of British Columbia
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We propose a new ghost fluid approach for free surface and solid boundary conditions in Smoothed Particle Hydrodynamics (SPH) liquid simulations. Prior methods either suffer from a spurious numerical surface tension artifact or drift away from the mass conservation constraint, and do not capture realistic cohesion of liquid to solids. Our Ghost SPH scheme resolves this with a new particle sampling algorithm to create a narrow layer of ghost particles in the surrounding air and solid, with careful extrapolation and treatment of fluid variables to reflect the boundary conditions. We also provide a new, simpler form of artificial viscosity based on XSPH. Examples demonstrate how the new approach captures real liquid behaviour previously unattainable by SPH with very little extra cost.
| Paper | PDF (5.8 MB) |
| Tomato | MOV (1.6 MB) |
| Bunny | MOV (5.0 MB) |
| Breaking Dam | MOV (2.7 MB) |
| Sampling Illustration | MOV (1.4 MB) |
| Full paper video | MOV (77 MB) |
@article{Schechter:2012:GhostSPH,
author = {Schechter, Hagit and Bridson, Robert},
title = {Ghost SPH for Animating Water},
journal = {ACM Transactions on Graphics (Proceedings of SIGGRAPH 2012)},
year = {2012},
volume = {31},
number = {4}
}