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Abstract:
We present a novel method for solid/fluid coupling that can treat
infinitesimally thin solids modeled by a lower dimensional
triangulated surface. Since classical solid/fluid coupling algorithms
rasterize the solid body onto the fluid grid, an entirely new approach
is required to treat thin objects that do not contain an interior
region. Robust ray casting is used to augment a number of
interpolation, finite difference and rendering techniques so that
fluid does not leak through the triangulated surface. Moreover, we
propose a technique for properly enforcing incompressibility so that
fluid does not incorrectly compress (and appear to lose mass) near the
triangulated surface. This allows for the robust interaction of cloth
and shells with thin sheets of water. The proposed method works for
both rigid body shells and for deformable manifolds such as cloth, and
we present a two way coupling technique that allows the fluid's
pressure to affect the solid. Examples illustrate that our method
performs well, especially in the difficult case of water and cloth
where it produces visually rich interactions between the particle
level set method for treating the water/air interface and our newly
proposed method for treating the solid/fluid interface. We have
implemented the method on both uniform and adaptive octree grids.
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