CITI news and thoughts: Fluid Dynamics Computing using GPUs

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September 16, 2009

Fluid Dynamics Computing using GPUs

This summer I had the opportunity to work on an emerging new platform for scientific computing - Graphics Processing Units (GPUs).

GPUs have long been very powerful alternative for graphics processing, but until recently were built on a platform that didn't allow them to be used for any other application. With the launch of the NVIDIA G80 and G200 series on the common unified device architecture (CUDA), GPUs now have an intuitive interface that allows researchers to harness their full potential. These now have over 100 processor cores (currently at 1.3 GHz), making them a powerful coprocessor able to accelerate scientific codes by one or more orders of magnitude by taking advantage of parallelism in the most computationally expensive mathematical operations.

The goal for my summer research was to investigate the use of these processors for fluid dynamics applications (historically one of the most computationally expensive fields). In order to test the GPU for non-idealistic conditions, a first order unstructured finite volume algorithm was chosen, as it is somewhat simple, yet relatively difficult to parallelize. It was found that even for this algorithm, a speedup of over 25 times can be achieved. The tech report can be found at http://johanndahm.com/papers.php.

I am currently working to develop new solvers for general fluid dynamics (and convection) problems which are less memory-bound. One problem with many current solvers is that the methods they utilize store too much data (often many many gigabytes). Our hope is that explicit or implicit-explicit iterative methods can be developed that may accelerate convergence of these problems with far less memory usage. In addition, we hope that these methods will be structured such that they can be run on a number of parallel platforms, including CPU clusters (using MPI) or GPUs.

Posted by jdahm at September 16, 2009 05:04 PM

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