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<p>In the present work, a modified three-dimensional (3D) numerical model was designed to simulate the water flow during a dam break with the transfer of sediments of various heights and different densities using the VOF (Volume of Fluid) method. A Newtonian model was applied to describe the movement of water, and a non-Newtonian model was applied to characterize the movement of sediments with different densities. The main purpose of the work was to consider an incompressible flow that includes four phases: water, air, the first phase for sediment with a certain density and the second phase for sediment with a certain density. The basic flow equations are incompressible Navier–Stokes equations. The numerical method PISO (Pressure-Implicit with Splitting of Operators) was used to solve these equations. The obtained results from the computation are in good agreement with data from the experiment, which proves the reliability and accuracy of the model for use. Numerical analysis is performed for cases with various heights and various sediment densities. The influence of three-dimensional flow features on morphological changes is considered by comparing the results of this model with the results calculated by other authors.</p>

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Three-dimension coupling model to simulate water flow, sediment transport with different properties and bed evolution: Numerical study

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Alibek Issakhov,
  • Alina Borčić,
  • Aizhan Abylkassymova,
  • Assylbek Issakhov

摘要

In the present work, a modified three-dimensional (3D) numerical model was designed to simulate the water flow during a dam break with the transfer of sediments of various heights and different densities using the VOF (Volume of Fluid) method. A Newtonian model was applied to describe the movement of water, and a non-Newtonian model was applied to characterize the movement of sediments with different densities. The main purpose of the work was to consider an incompressible flow that includes four phases: water, air, the first phase for sediment with a certain density and the second phase for sediment with a certain density. The basic flow equations are incompressible Navier–Stokes equations. The numerical method PISO (Pressure-Implicit with Splitting of Operators) was used to solve these equations. The obtained results from the computation are in good agreement with data from the experiment, which proves the reliability and accuracy of the model for use. Numerical analysis is performed for cases with various heights and various sediment densities. The influence of three-dimensional flow features on morphological changes is considered by comparing the results of this model with the results calculated by other authors.