A Parallel Finite-volume Method for Hydrodynamic Modeling of River Network

SONG Li-xiang; LI Qing-qing; HU Xiao-zhang; YANG Fang; CHEN Wen-long

doi:10.11988/ckyyb.20171146

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (5) : 7-12. DOI: 10.11988/ckyyb.20171146

RIVER-LAKE SEDIMENTATION AND REGULATION

A Parallel Finite-volume Method for Hydrodynamic Modeling of River Network

SONG Li-xiang¹, LI Qing-qing², HU Xiao-zhang¹, YANG Fang¹, CHEN Wen-long¹

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Abstract

A hydrodynamic model of complex river network in which the computational cross-sections and reaches are fully decoupled is constructed for river network with dry beds and transition between supercritical and subcritical flows. The MUSCL-Hancock finite-volume scheme is adopted to discrete the Saint-Venant equations, and the method of Junction-Point Water Stage Prediction and Correction (JPWSPC) is used to calculate the hydrodynamic relations at junctions. The OpenMP and OpenACC applications are used to realize CPU-based and GPU-based parallel computing, respectively. Model accuracy is validated by benchmark cases with exact solutions, and the performance of parallel computing is demonstrated by real flood simulation of the Pearl River Delta. Results show that the proposed model is stable and effective, and is applicable for hydrodynamic simulation for steep river, thus has bright application prospects.

Key words

river network / hydrodynamics model / finite-volume method / GPU parallel computing / CPU parallel computing / numerical simulation

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SONG Li-xiang, LI Qing-qing, HU Xiao-zhang, YANG Fang, CHEN Wen-long. A Parallel Finite-volume Method for Hydrodynamic Modeling of River Network[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(5): 7-12 https://doi.org/10.11988/ckyyb.20171146

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