We present an efficient method for the simulation of three-dimensional
laminar fluid flows with free surfaces including its interaction with
moving rigid bodies, based on the two-dimensional shallow water
equations and the Lattice-Boltzmann method. Our implementation targets
multiple fundamentally different architectures such as commodity
multicore CPUs with SSE, GPUs, the Cell BE and clusters. We show that
our code scales well on a MPI-based cluster; that an eightfold speedup
can be achieved using modern GPUs in contrast to multithreaded CPU code
and finally, that it is possible to solve fluid-structure interaction
scenarios with high resolution at interactive rates.