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(Animating the interplay between rigid bodies and fluid)
We present the Rigid Fluid method, a technique for animating the interplay between rigid bodies and viscous incompressible fluid. We use Lagrange multipliers to ensure two-way coupling that generates realistic motion for both the solid objects and the fluid as they interact with one another. This method is called the rigid fluid method because the simulator treats the rigid objects as if they were made of fluid. The rigidity of such an object is maintained by identifying the region of the velocity field that is inside the object and constraining those velocities to be rigid body motion. Many solid objects of different densities (e.g., wood or lead) can be combined in the same animation.
Keywords: MAC (marker and cell), rigid fluid, computational fluid dynamics
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