This paper by Kolb and Cuntz from the computer graphics group of the University of Siegen describes a 3D flow simulation approach on the GPU. The flow simulation is modeled using the so-called Smoothed Particle Hydrodynamics approach. The presented technique combines the particle simulation, presented by Kipfer et.al. and Kolb et.al. at Graphics-Hardware 2004, with a grid based approach. 3D grids are used to store intermediate flow quantities that are distributed by the particles in their neighborhood. MRT is used to compute the contribution of a single particle to four texture slices simultaneously. Blending the individual contribution of all particles in 16bit textures yields the final 3D force fields used for the simulation of particle motion. (Dynamic Particle Coupling for GPU-based Fluid Simulation)