Narrow band FLIP for liquid simulations Journal Article

Author(s): Ferstl, Florian; Ando, Ryoichi; Wojtan, Chris; Westermann, Rüdiger; Thuerey, Nils
Article Title: Narrow band FLIP for liquid simulations
Affiliation IST Austria
Abstract: 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.
Keywords: Numerical methods; Liquid simulations; Fluids; Liquids; Coupling scheme; Energy fluctuation; Numerical dissipation; Particle methods; Simulation time; Small-scale features; Visual appearance
Journal Title: Computer Graphics Forum
Volume: 35
Issue 2
ISSN: 1467-8659
Publisher: Wiley  
Date Published: 2016-05-01
Start Page: 225
End Page: 232
DOI: 10.1111/cgf.12825
Open access: yes (repository)
IST Austria Authors
  1. Chris Wojtan
    34 Wojtan
  2. Ryoichi Ando
    5 Ando
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