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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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  • 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...

    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...

    Source of Output dynamics in USA vs. Great Britain: supply, demand or nominal shocks

    Rzigui, Lotfi (2005)
    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...

    A dimension-reduced pressure solver for liquid simulations

    Ando, Ryoichi; Thürey, Nils; Wojtan, Chris (2015)
    Projects: EC | Big Splash (638176)
    This work presents a method for efficiently simplifying the pressure projection step in a liquid simulation. We first devise a straightforward dimension reduction technique that dramatically reduces the cost of solving the pressure projection. Next, we introduce a novel change of basis that satisfies free-surface boundary conditions exactly, regardless of the accuracy of the pressure solve. When combined, these ideas greatly reduce the computational complexity of the pressure solve without co...

    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...

    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...

    Tracking, Correcting and Absorbing Water Surface Waves

    Bojsen-Hansen, Morten (2016)
    Projects: EC | Big Splash (638176)
    Computer graphics is an extremely exciting field for two reasons. On the one hand, there is a healthy injection of pragmatism coming from the visual effects industry that want robust algorithms that work so they can produce results at an increasingly frantic pace. On the other hand, they must always try to push the envelope and achieve the impossible to wow their audiences in the next blockbuster, which means that the industry has not succumb to conservatism, and there is plenty of room to tr...

    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...

    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...

    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...
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