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Towards a generalised GPU/CPU shallow-flow modelling tool

Lookup NU author(s): Dr Luke Smith, Professor Qiuhua Liang

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Abstract

This paper presents new software that takes advantage of modern graphics processing units (GPUs) to significantly expedite two-dimensional shallow-flow simulations when compared to a traditional central processing unit (CPU) approach. A second-order accurate Godunov-type MUSCL-Hancock scheme is used with an HLLC Riemann solver to create a robust framework suitable for different types of flood simulation. A real-world dam collapse event is simulated using a 1.8 million cell domain with CPU and GPU hardware available from three mainstream vendors. The results are shown to exhibit good agreement with a post-event survey. Different configurations are evaluated for the program structure and data caching, with results demonstrating the new software’s suitability for use with different types of modern processing device. Performance scaling is similar to differences in quoted peak performance figures supplied by the vendors. We also compare results obtained with 32-bit and 64-bit floating-point computation, and find there are significant localised errors introduced by 32-bit precision.

Publication metadata

Author(s): Smith LS, Liang Q

Publication type: Article

Publication status: Published

Journal: Computers & Fluids

Year: 2013

Volume: 88

Pages: 334-343

Print publication date: 25/09/2013

ISSN (print): 0045-7930

ISSN (electronic): 1879-0747

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.compfluid.2013.09.018

DOI: 10.1016/j.compfluid.2013.09.018

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