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<p>This study presents a theoretical and numerical investigation of flow characteristics in a non-prismatic compound channel with varying cross-sectional geometry. Key hydraulic parameters such as water depth and flow distribution in the main channel and adjoining floodplains are analyzed. A theoretical method is proposed to predict the depth-averaged velocity distribution in such complex geometries, where flow behavior becomes intricate due to its three-dimensional nature and the generation of secondary currents caused by channel contractions and expansions. Traditional discharge estimation methods, which assume prismatic channel conditions, often introduce significant errors in compound channels with converging sections. To address this, a computational fluid dynamics (CFD) approach using a two-phase model in ANSYS-FLUENT is employed to simulate flow over banks. The study evaluates depth-averaged velocity distribution, boundary shear stress, and surface water elevation across five configurations with varying aspect ratios. The Volume of Fluid (VOF) technique is used to capture the free surface under turbulent flow conditions. Several turbulence models, including k − ε, k − ω, and Large Eddy Simulation (LES), are applied to predict open channel flow characteristics with high accuracy. The results show good agreement with available experimental data, effectively capturing secondary circulation patterns in both in-bank and overbank regions.</p>

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Numerical Investigation of Two-Phase Flow Through Non-Prismatic Compound Channel

  • 期刊论文

  • 发表日期：

    2025年9月28日

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  • Prajna Priyadarsini Roul,
  • Deba Prakash Satapathy,
  • Prateek Debadarsi Roul,
  • Saipada B. B. P. J. Sahu,
  • Bishnu P. Mishra,
  • Manmatha K. Roul

摘要

This study presents a theoretical and numerical investigation of flow characteristics in a non-prismatic compound channel with varying cross-sectional geometry. Key hydraulic parameters such as water depth and flow distribution in the main channel and adjoining floodplains are analyzed. A theoretical method is proposed to predict the depth-averaged velocity distribution in such complex geometries, where flow behavior becomes intricate due to its three-dimensional nature and the generation of secondary currents caused by channel contractions and expansions. Traditional discharge estimation methods, which assume prismatic channel conditions, often introduce significant errors in compound channels with converging sections. To address this, a computational fluid dynamics (CFD) approach using a two-phase model in ANSYS-FLUENT is employed to simulate flow over banks. The study evaluates depth-averaged velocity distribution, boundary shear stress, and surface water elevation across five configurations with varying aspect ratios. The Volume of Fluid (VOF) technique is used to capture the free surface under turbulent flow conditions. Several turbulence models, including k − ε, k − ω, and Large Eddy Simulation (LES), are applied to predict open channel flow characteristics with high accuracy. The results show good agreement with available experimental data, effectively capturing secondary circulation patterns in both in-bank and overbank regions.