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Lagrangian Vortex Sheets for Animating Fluids

机译:用于流体的拉格朗日涡旋板

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Buoyant turbulent smoke plumes with a sharp smoke-air interface, such as volcanic plumes, are notoriously hard to simulate. The surface clearly shows small-scale turbulent structures which are costly to resolve. In addition, the turbulence onset is directly visible at the interface, and is not captured by commonly used turbulence models. We present a novel approach that employs a triangle mesh as a highresolution surface representation combined with a coarse Eulerian solver. On the mesh, we solve the interfacial vortex sheet equations, which allows us to accurately simulate buoyancy induced turbulence. For complex boundary conditions we propose an orthogonal turbulence model that handles vortices caused by obstacle interaction. In addition, we demonstrate a re-sampling scheme to remove surfaces that are hidden inside the bulk volume. In this way we are able to achieve highly detailed simulations of turbulent plumes efficiently.
机译:众所周知,带有尖锐的烟气界面的湍流湍流烟雾(例如火山烟)很难模拟。表面清楚地显示出小规模的湍流结构,解决起来成本很高。此外,湍流起始点在界面处直接可见,而常用的湍流模型无法捕获。我们提出了一种新颖的方法,该方法采用了三角形网格作为高分辨率表面表示并结合了粗糙的欧拉求解器。在网格上,我们求解了界面涡旋方程,这使我们能够准确地模拟浮力引起的湍流。对于复杂的边界条件,我们提出了一种正交湍流模型,该模型可以处理由障碍物相互作用引起的涡流。此外,我们演示了一种重新采样方案,以去除隐藏在大体积内部的表面。通过这种方式,我们能够高效地实现湍流羽流的高度详细的模拟。

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