Stable fluids

  • Stam J
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Building animation tools for fluid-like motions is an important and challenging problem with many applications in computer graphics. The use of physics-based models for fluid flow can greatly assist in creating such tools. Physical models, unlike key frame or pro-cedural based techniques, permit an animator to almost effortlessly create interesting, swirling fluid-like behaviors. Also, the interac-tion of flows with objects and virtual forces is handled elegantly. Until recently, it was believed that physical fluid models were too expensive to allowreal-time interaction. Thiswas largely due to the fact that previous models used unstable schemes to solve the phys-ical equations governing a fluid. In this paper, for the first time, we propose an unconditionally stable model which still produces complex fluid-like flows. As well, our method is very easy to im-plement. The stability of our model allows us to take larger time steps and therefore achieve faster simulations. We have used our model in conjuction with advecting solid textures to create many fluid-like animations interactively in two- and three-dimensions.

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  • Jos Stam

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