Narrow band FLIP for liquid simulations

Ferstl, Florian and Ando, Ryoichi and Wojtan, Chris and Westermann, Rüdiger and Thuerey, Nils (2016) Narrow band FLIP for liquid simulations. Computer Graphics Forum, 35 (2). pp. 225-232. ISSN 1467-8659

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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.

Item Type: Article
DOI: 10.1111/cgf.12825
Additional Information: This is the peer reviewed version of the following article: Ferstl, Florian, Ando, Ryoichi, Wojtán, Chris, Westermann, Rüdiger, Thuerey, Nils: Narrow band FLIP for liquid simulations. In: Computer Graphics Forum. Blackwell Publishing, 2, 2016,225-232, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Uncontrolled Keywords: Numerical methods, liquid simulations, fluids, liquids, coupling scheme, energy fluctuation, numerical dissipation, particle methods, simulation time, small-scale features, visual appearance
Subjects: 000 Computer science, knowledge & general works > 000 Computer science, knowledge & systems
Research Group: Wojtan Group
SWORD Depositor: Sword Import User
Depositing User: Christopher Wojtan
Date Deposited: 23 Jun 2016 10:04
Last Modified: 30 Aug 2017 10:52

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