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gNek: A GPU Accelerated Incompressible Navier Stokes Solver

Nichole Stilwell
Rice University
Rice University, 2013
@phdthesis{stilwell2013gnek,

   title={gNek: A GPU Accelerated Incompressible Navier Stokes Solver},

   author={Stilwell, Nichole},

   year={2013},

   school={Masters Thesis, Rice University. http://hdl. handle. net/1911/72043}

}

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This thesis presents a GPU accelerated implementation of a high order splitting scheme with a spectral element discretization for the incompressible Navier Stokes (INS) equations. While others have implemented this scheme on clusters of processors using the Nek5000 code, to my knowledge this thesis is the first to explore its performance on the GPU. This work implements several of the Nek5000 algorithms using OpenCL kernels that efficiently utilize the GPU memory architecture, and achieve massively parallel on chip computations. These rapid computations have the potential to significantly enhance computational fluid dynamics (CFD) simulations that arise in areas such as weather modeling or aircraft design procedures. I present convergence results for several test cases including channel, shear, Kovasznay, and lid-driven cavity flow problems, which achieve the proven convergence results.
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