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A parallel distributed CUDA implementation of a Lattice Boltzmann Method for multiphase flows with large density ratios is described in this paper. Validation runs studying the terminal velocity of a rising bubble under the effect of gravity show good agreement with the expected theoretical values. The code is benchmarked against the performance of a typical CPU implementation of the same algorithm on both AMD and Intel platforms, and a single GPU is observed to perform up to 10X faster than a quad-core CPU socket, a 40X speedup with respect to a single core. The code is shown to scale well when executed on multiple GPUs, which makes the port to CUDA valuable even when compared to parallel CPU implementations.
Date of Conference: 26-30 Sept. 2011