Abstract
GPU has been applied in groundwater flow simulation. In order to improve the performance of the GPU groundwater simulation further, this paper studied the method of parallelizing three-dimensional groundwater flow simulation on multiple GPUs. The most time-consuming part in the groundwater flow simulation, solving equations, is parallelized on multiple GPUs. The PCG solver is parallelized to solve equations. To maximize the communication efficiency of the parallelized PCG, optimizations that reduce the unnecessary data communication and overlap the communication with calculation were used. Experimental tests using 6 NVIDIA K40m GPUs show that the maximum speedup of the PCG solver and the groundwater flow simulation is up to 36.3 and 11 respectively for a steady-state simulation.
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