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Narrow Band FLIP for Liquid Simulations
Author(s) -
Ferstl Florian,
Ando Ryoichi,
Wojtan Chris,
Westermann Rüdiger,
Thuerey Nils
Publication year - 2016
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/cgf.12825
Subject(s) - computer science , grid , particle (ecology) , flip , realization (probability) , dissipation , computational science , coupling (piping) , mechanics , topology (electrical circuits) , physics , materials science , geometry , mathematics , chemistry , apoptosis , biochemistry , oceanography , statistics , combinatorics , thermodynamics , geology , metallurgy
The Fluid Implicit Particle method (FLIP) for liquid simulations uses particles to reduce numerical dissipation and provide important visual cues for events like complex splashes and small‐scale features near the liquid surface. Unfortunately, FLIP simulations can be computationally expensive, because they require a dense sampling of particles to fill the entire liquid volume. Furthermore, the vast majority of these FLIP particles contribute nothing to the fluid's visual appearance, especially for larger volumes of liquid. We present a method that only uses FLIP particles within a narrow band of the liquid surface, while efficiently representing the remaining inner volume on a regular grid. We show that a naïve realization of this idea introduces unstable and uncontrollable energy fluctuations, and we propose a novel coupling scheme between FLIP particles and regular grid which overcomes this problem. Our method drastically reduces the particle count and simulation times while yielding results that are nearly indistinguishable from regular FLIP simulations. Our approach is easy to integrate into any existing FLIP implementation.