基于非结构网格的洪水演进过程中GPU加速数值模型研究  

GPU accelerated numerical model of flood propagation process based on unstructured grids

作　　者：汪煜 侯精明 张兆安 张大伟[2] 王志力[3] 明瑞中 WANG Yu;HOU Jing-ming;ZHANG Zhao-an;ZHANG Da-wei;WANG Zhi-li;MING Rui-zhong(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an 710048,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Gaiaxis Information Technology Co.Ltd,Beijing 100043,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048 [2]中国水利水电科学研究院,北京100038 [3]南京水利科学研究院,南京210029 [4]北京空擎信息技术有限公司,北京100043

出　　处：《水动力学研究与进展（A辑）》2021年第4期557-566,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金项目(52009104和52079106)。

摘　　要：为降低洪水风险并有效地进行洪水管理,研究洪水演进及淹没过程显得尤为重要。该文建立了一套基于非结构网格的二维水动力数值模型,采用三角形网格剖分计算域以适应不规则地形边界,并利用图形处理器(GPU)加速技术以大幅提高模型计算效率,可快速有效地模拟大尺度复杂地形条件下的洪水演进过程,为防洪减灾决策提供强有力的数据支撑。通过三个经典算例研究表明:该模型具有较高的准确性、稳定性和适用性。并将模型应用于Malpasset溃坝后的洪水演进过程,发现计算结果与实测数据吻合较好,计算效率较高,仅用时52 s就完成了溃坝后3600 s内水动力过程的模拟计算,表明模型能高效准确地模拟大范围高分辨率地形上的洪水演进过程,具有较高的应用价值。To reduce flood risk and manage flood effectively,it is particularly important to study flood propagation and inundation process.This paper presents a 2D hydrodynamic numerical model based on unstructured grids.In the model,the triangular grid is used to divide the calculation domain to adapt to the irregul ar terrain boundary,the calculation efficiency of the model is greatly improved by using Graphics Processing Units(GPU)accele ration techniques.It can simulate the hydrodynamic process under large scale and complex topography quickly and effectively,and provide hard data support for flood control and disaster reduction decisions.The accuracy,stability and applicability of this mo del are verified by three classic examples.Finally,the model is applied to the flood propagation process simulation calculation after t he Malpasset dam break.It is found that the calculation results are in good agreement with the measurements,and the calculation efficiency is excellent.It takes only 52 s to complete the simulation calculation of the hydrodynamic process within the 3600 s after the dam break,which shows that the model has great application value in simulating flood propagation process over a large scale and high-resolution terrain effectively and accurately.

关 键 词：非结构网格 洪水演进 GPU并行计算 水动力模型 有限体积法 

分 类 号：TV131.2[水利工程—水力学及河流动力学]