The particle-based method supports user-defined regions of refinement and can handle complex collision boundary conditions while remaining smooth and stable. Conservation of mass in refined detail levels is handled explicitly, overcoming mass-loss problems of previous multi-scale SPH techniques.
By restricting fine-resolution particles to regions defined relatively near to
the fluid surface and close to an observer, the computation time and storage
requirements for large simulations are significantly reduced. Compared to an
equivalent single-scale simulation, our method reduces the computational costs
up to a factor of twelve.
Paper (PDF)
Additional materials: [MultiScaleSPH_PixarTechMemo13.04_July19_2013.mov]
Available as Pixar Technical Memo #13-04