溃坝洪水演进与淹没范围快速模拟,对指导抢险救灾至关重要.为此,引入 GPU 加速技术,构建了一套高效高分辨率溃坝数值模型,与经典三驼峰溃坝试验对比发现,模拟结果与试验结果非常吻合,并利用该模型模拟了典型溃坝洪水演进及溃口流场、溃后水位变化情况.结果表明,模型能较好地模拟溃坝洪水演进,较好捕捉溃口发展过程及泥沙输移.t=200 s 时溃决流量出现小峰值 4 m3/s,t=450 s 时,溃决流量出现最大峰值 13.8 m3/s;随着下泄流量增大,溃口加速侵蚀和冲刷并逐渐连通,溃口由 0.21 m 扩大至 0.40 m.GPU加速比约为CPU的 10.33～13.75 倍,且网格数越多,加速效果越明显.
Abstract
Rapid simulation of dam-break flood evolution and inundation range is very important for guiding emergen-cy rescue and disaster relief.Therefore,GPU acceleration technology was introduced to construct a set of high-efficiency and high-resolution dam-break numerical model.Compared with the classical three-hump dam-break test,it is found that the simulation results are in good agreement with the experimental results.The results show that the model can better simulate the evolution of dam-break flood,and better capture the development process of dam-break and sediment trans-port.When t = 200 s,the outburst flow has a small peak value of 4 m3/s,and when t = 450 s,the maximum peak val-ue of 13.8 m3/s appears.With the increase of discharge flow,the breach accelerated erosion and erosion and gradually connected,and the breach expanded from 0.21 m to 0.40 m.The GPU acceleration ratio is about 10.33-13.75 times of CPU,and the more the number of grids,the more obvious the acceleration effect is.
关键词
溃坝/水动力模型/洪水演进/GPU加速
Key words
dam break/hydrodynamic model/flood evolution/GPU acceleration
维普
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