Acceleration of a CFD code with a GPU

Authors:
Dennis C. Jespersen
Affiliations:
NASA/Ames Research Center, Moffett Field, CA, USA. Tel.: +1 650 604 6742/ Fax: +1 650 604 4377/ E-mail: Dennis.Jespersen@nasa.gov
Venue:
Scientific Programming - Exploring Languages for Expressing Medium to Massive On-Chip Parallelism
Year:
2010

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Abstract

The Computational Fluid Dynamics code OVERFLOW includes as one of its solver options an algorithm which is a fairly small piece of code but which accounts for a significant portion of the total computational time. This paper studies some of the issues in accelerating this piece of code by using a Graphics Processing Unit (GPU). The algorithm needs to be modified to be suitable for a GPU and attention needs to be given to 64-bit and 32-bit arithmetic. Interestingly, the work done for the GPU produced ideas for accelerating the CPU code and led to significant speedup on the CPU.