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Modeling Transient Mixed Flows in Drainage Networks With Smoothed Particle Hydrodynamics

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Abstract

Transitions between free-surface and pressurized flows (transient mixed flows) are common and complex phenomena in urban drainage systems. Currently, the free-surface-pressurized flow models are mainly solved by grid-based numerical schemes, while the application of meshless methods to such problems remains relatively unexplored. Therefore, this study proposes a novel meshless model based on Smoothed Particle Hydrodynamics coupled with the Two-component Pressure Approach (SPH-TPA) to simulate transient mixed flows. To extend the applicability of the SPH-TPA model to drainage networks, a junction boundary model is developed based on the flow regimes in the junction and inflowing/outflowing pipes. Three idealized cases and two experimental cases are investigated for model validation and parameter sensitivity analysis. The results indicate the capability of the SPH-TPA model to deal with various flow conditions and capture transition interfaces accurately. Furthermore, a hypothetical drainage network is applied to evaluate the performance of the SPH-TPA model for simulating mixed flows in complex drainage systems, and the results of the SPH-TPA model demonstrate better accuracy and stability compared to the SWMM (Storm Water Management Model). The proposed SPH-TPA model provides an alternative tool to investigate transient mixed flows in urban drainage systems.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China [grant numbers: 51978493, 52000142]; SZ-HK-Macau Technology Research Programme (Type C) [grant number: SGDX20210823103537035]; General Research Fund [No. 17202020] from Hong Kong Research Grants Council. We also thank the anonymous reviewers and editors for their comments and suggestions.

Funding

This work was financially supported by National Natural Science Foundation of China [Grant numbers: 51978493, 52000142]; SZ-HK-Macau Technology Research Programme (Type C) [Grant number: SGDX20210823103537035]; General Research Fund [No. 17202020] from Hong Kong Research Grants Council.

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Wenke Song: Conceptualization, Methodology, Data curation, Visualization, Writing—original draft; Hexiang Yan: Conceptualization, Supervision, Writing—review & editing; Tao Tao: Funding acquisition, Supervision, Writing—review & editing; Mingfu Guan: Funding acquisition, Writing—review & editing; Fei Li: Funding acquisition, Writing—review & editing; Kunlun Xin: Writing—review & editing.

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Correspondence to Hexiang Yan or Mingfu Guan.

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Song, W., Yan, H., Tao, T. et al. Modeling Transient Mixed Flows in Drainage Networks With Smoothed Particle Hydrodynamics. Water Resour Manage 38, 861–879 (2024). https://doi.org/10.1007/s11269-023-03689-5

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  • DOI: https://doi.org/10.1007/s11269-023-03689-5

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