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<p>Urban sewer networks are prone to solid deposition, which compromises hydraulic performance and increases maintenance frequency. This study presents a Computational Fluid Dynamics (CFD) model using the Euler–Euler multiphase approach coupled with the RNG k-ε turbulence model to analyze the dynamics of solid particle resuspension under stormflow conditions. A cylindrical pipe (1&#xa0;m in diameter, 5&#xa0;m in length) was modeled to simulate a water–solid mixture where solid particles (7.5&#xa0;mm in diameter, density = 2109.1&#xa0;kg/m³) were introduced at three water velocities (4, 5, and 6&#xa0;m/s).Unlike most previous studies, this research explicitly imposes variable inlet velocities for the solid phase, defined as 50%, 80%, and 95% of the water velocity, to investigate the effect of initial slip velocity on particle distribution, cleaning efficiency, and wall interactions. Results show that increasing the solid phase velocity improves resuspension efficiency but also increases wall shear stress and erosion potential. These findings provide new insights for optimizing hydraulic cleaning strategies and enhancing the self-cleansing capacity of wastewater pipelines.</p>

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CFD investigation of solid–liquid two-phase flow in sewer pipes: influence of inlet slip velocity on particle resuspension

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Abdelhamid Mohammedi,
  • Farida Merrouchi,
  • Fatima Zohra Fourar,
  • Ali Fourar,
  • Fawaz Massouh

摘要

Urban sewer networks are prone to solid deposition, which compromises hydraulic performance and increases maintenance frequency. This study presents a Computational Fluid Dynamics (CFD) model using the Euler–Euler multiphase approach coupled with the RNG k-ε turbulence model to analyze the dynamics of solid particle resuspension under stormflow conditions. A cylindrical pipe (1 m in diameter, 5 m in length) was modeled to simulate a water–solid mixture where solid particles (7.5 mm in diameter, density = 2109.1 kg/m³) were introduced at three water velocities (4, 5, and 6 m/s).Unlike most previous studies, this research explicitly imposes variable inlet velocities for the solid phase, defined as 50%, 80%, and 95% of the water velocity, to investigate the effect of initial slip velocity on particle distribution, cleaning efficiency, and wall interactions. Results show that increasing the solid phase velocity improves resuspension efficiency but also increases wall shear stress and erosion potential. These findings provide new insights for optimizing hydraulic cleaning strategies and enhancing the self-cleansing capacity of wastewater pipelines.