Numerical modeling of dispersed particle motion in pipelines with abrupt contractions

In this study, the numerical modeling of dispersed particle transport and fluid flow through a sudden contraction, where a larger-diameter pipe transitions into a smaller-diameter pipe, was carried out. To capture the turbulent characteristics of the carrier fluid, the Spalart–Allmaras (SA) turbulence model was employed due to its proven efficiency in predicting boundary-layer flows and separation phenomena in engineering applications. For the dispersed phase, the Volume of Fluid (VOF) approach was applied to accurately track the particle trajectories and their interaction with the continuous phase. This combination of turbulence modeling and multiphase treatment allowed a detailed investigation of the flow structure, particle behavior, and dispersion mechanisms in the contraction zone. The numerical simulations provided insights into the velocity distribution, turbulence intensity, and particle concentration under varying flow conditions, offering a deeper understanding of multiphase flow dynamics in geometries with sudden area changes.

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