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Big Splash

Big Splash: Efficient Simulation of Natural Phenomena at Extremely Large Scales
EC | H2020 | ERC | ERC-STG
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IST Austria
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  • A stream function solver for liquid simulations

    Ando, Ryoichi; Thuerey, Nils; Wojtan, Chris (2015)
    Projects: EC | Big Splash (638176)
    This paper presents a liquid simulation technique that enforces the incompressibility condition using a stream function solve instead of a pressure projection. Previous methods have used stream function techniques for the simulation of detailed single-phase flows, but a formulation for liquid simulation has proved elusive in part due to the free surface boundary conditions. In this paper, we introduce a stream function approach to liquid simulations with novel boundary conditions for free sur...

    Adaptive Physically Based Models in Computer Graphics

    Manteaux , Pierre-Luc; Wojtan , Chris; Narain , Rahul; Redon , Stéphane; Faure , François; Cani , Marie-Paule (2017)
    Projects: EC | Big Splash (638176)
    International audience; One of the major challenges in physically-based modeling is making simulations efficient. Adaptive models provide an essential solution to these efficiency goals. These models are able to self-adapt in space and time, attempting to provide the best possible compromise between accuracy and speed. This survey reviews the adaptive solutions proposed so far in computer graphics. Models are classified according to the strategy they use for adaptation, from time-stepping and...

    High-resolution brittle fracture simulation with boundary elements

    Hahn, David; Wojtan, Chris (2015)
    Projects: EC | Big Splash (638176)
    We present a method for simulating brittle fracture under the assumptions of quasi-static linear elastic fracture mechanics (LEFM). Using the boundary element method (BEM) and Lagrangian crack-fronts, we produce highly detailed fracture surfaces. The computational cost of the BEM is alleviated by using a low-resolution mesh and interpolating the resulting stress intensity factors when propagating the high-resolution crack-front. Our system produces physics-based fracture surfaces with hig...

    Water wave animation via wavefront parameter interpolation

    Jeschke, Stefan; Wojtan, Chris (2015)
    Projects: EC | Big Splash (638176)
    We present an efficient wavefront tracking algorithm for animating bodies of water that interact with their environment. Our contributions include: a novel wavefront tracking technique that enables dispersion, refraction, reflection, and diffraction in the same simulation; a unique multivalued function interpolation method that enables our simulations to elegantly sidestep the Nyquist limit; a dispersion approximation for efficiently amplifying the number of simulated waves by several orders ...

    A unified differential information framework assessing that more information is preferred to less

    Fugarolas Álvarez-Ude, Guadalupe; Hervés-Beloso, Carlos (2005)
    Projects: EC | Big Splash (638176)
    Combining high-resolution level set surface tracking with lower resolution physics is an inexpensive method for achieving highly detailed liquid animations. Unfortunately, the inherent resolution mismatch introduces several types of disturbing visual artifacts. We identify the primary sources of these artifacts and present simple, efficient, and practical solutions to address them. First, we propose an unconditionally stable filtering method that selectively removes sub-grid surface artifacts...

    Surface-only liquids

    Da, Fang; Hahn, David; Batty, Christopher; Wojtan, Chris; Grinspun, Eitan (2016)
    Projects: EC | Big Splash (638176)
    We propose a novel surface-only technique for simulating incompressible, inviscid and uniform-density liquids with surface tension in three dimensions. The liquid surface is captured by a triangle mesh on which a Lagrangian velocity field is stored. Because advection of the velocity field may violate the incompressibility condition, we devise an orthogonal projection technique to remove the divergence while requiring the evaluation of only two boundary integrals. The forces of surface tension...

    Fast approximations for boundary element based brittle fracture simulation

    Hahn, David; Wojtan, Chris (2016)
    Projects: EC | Big Splash (638176)
    We present a boundary element based method for fast simulation of brittle fracture. By introducing simplifying assumptions that allow us to quickly estimate stress intensities and opening displacements during crack propagation, we build a fracture algorithm where the cost of each time step scales linearly with the length of the crackfront. The transition from a full boundary element method to our faster variant is possible at the beginning of any time step. This allows us to build a hybrid me...

    Brittle fracture simulation with boundary elements for computer graphics

    Hahn, David (2017)
    Projects: EC | Big Splash (638176)
    This thesis describes a brittle fracture simulation method for visual effects applications. Building upon a symmetric Galerkin boundary element method, we first compute stress intensity factors following the theory of linear elastic fracture mechanics. We then use these stress intensities to simulate the motion of a propagating crack front at a significantly higher resolution than the overall deformation of the breaking object. Allowing for spatial variations of the material's toughness durin...

    Double bubbles sans toil and trouble: discrete circulation-preserving vortex sheets for soap films and foams

    Da, Fang; Batty, Christopher; Wojtan, Chris; Grinspun, Eitan (2015)
    Projects: EC | Big Splash (638176)
    Simulating the delightful dynamics of soap films, bubbles, and foams has traditionally required the use of a fully three-dimensional many-phase Navier-Stokes solver, even though their visual appearance is completely dominated by the thin liquid surface. We depart from earlier work on soap bubbles and foams by noting that their dynamics are naturally described by a Lagrangian vortex sheet model in which circulation is the primary variable. This leads us to derive a novel circulation-preserving...

    Generalized non-reflecting boundaries for fluid re-simulation

    Bojsen-Hansen, Morten; Wojtan, Chris (2016)
    Projects: EC | Big Splash (638176)
    When aiming to seamlessly integrate a fluid simulation into a larger scenario (like an open ocean), careful attention must be paid to boundary conditions. In particular, one must implement special “non-reflecting“ boundary conditions, which dissipate out-going waves as they exit the simulation. Unfortunately, the state of the art in non-reflecting boundary conditions (perfectly-matched layers, or PMLs) only permits trivially simple inflow/outflow conditions, so there is no reliable way to int...
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