Eulerian-Lagrangian Numerical Simulation of Compressible Gas-Particle Two-Phase Flow on Three-Dimensional Unstructured Grids
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The compressible gas-particle multiphase flows with multi-scale characteristics are widely present in engineering fields and natural environments. Numerical simulation serves as a key approach for investigating the complex behaviors of such dispersed multiphase flows. However, existing Eulerian–Lagrangian methods are largely confined to structured grids[1, 2]. To address this limitation, this study develops an Eulerian–Lagrangian framework based on three-dimensional unstructured grids, enabling the simulation of gas-particle flows spanning dilute to dense regimes within complex geometries.In terms of numerical methodology, the gas-phase governing equations are discretized using the finite volume method (FV), with a unified Riemann solver applied to handle the convective and nozzling terms. For the particle phase, the soft-sphere model within the discrete element method (DEM) is employed to simulate inter-particle collisions. A Lagrangian particle localization algorithm suitable for unstructured grids is proposed, anda corresponding particle-to-grid mapping relationship is established to facilitate the computation of coupling terms.Finally, the effectiveness of the developed method is validated through quantitative comparisons between multiple representative test cases and experimental results. The computational outcomes demonstrate good agreement with the experimental data.
