6058

Development of a Flow Solver with Complex Kinetics on the Graphic Processing Units

Hai P. Le, Jean-Luc Cambier
Department of Mechanical and Aerospace Engineering, UCLA, Los Angeles, CA
arXiv:1110.4903v1 [physics.flu-dyn] (21 Oct 2011)

@article{2011arXiv1110.4903L,

   author={Le, Hai P. and Cambier, Jean-Luc},

   title={"{Development of a Flow Solver with Complex Kinetics on the Graphic Processing Units}"},

   journal={ArXiv e-prints},

   archivePrefix={"arXiv"},

   eprint={1110.4903},

   primaryClass={"physics.flu-dyn"},

   keywords={Fluid Dynamics,Computational Physics},

   year={2011},

   month={oct}

}

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The current paper reports on the implementation of a numerical solver on the Graphic Processing Units (GPU) to model reactive gas mixture with detailed chemical kinetics. The solver incorporates high-order finite volume methods for solving the fluid dynamical equations coupled with stiff source terms. The chemical kinetics are solved implicitly via an operator-splitting method. We explored different approaches in implementing a fast kinetics solver on the GPU. The detail of the implementation is discussed in the paper. The solver is tested with two high-order shock capturing schemes: MP5 (Suresh, et al. (1997)) and ADERWENO (Titarev, et al. (2005)). Considering only the fluid dynamics calculation, the speed-up factors obtained are 30 for the MP5 scheme and 55 for ADERWENO scheme. For the fully-coupled solver, the performance gain depended on the size of the reaction mechanism. Two different examples of chemistry were explored. The first mechanism consisted of 9 species and 38 reactions, resulting in a speed-up factor up to 35. The second, larger mechanism consisted of 36 species and 308 reactions, resulting in a speed-up factor of up to 40.
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