Numerical Simulations of Liquid-Solid Flows in A Vertical Pipe by MPS-DEM Coupling Method

Abstract

In the process of deep-sea mining, the liquid-solid flows in the vertical transportation pipeline are very complex. In the present work, an in-house solver MPSDEM-SJTU based on the improved MPS and DEM is developed for the simulation of hydraulic conveying. Firstly, three examples including the multilayer cylinder collapse, the Poiseuille flow and two-phase dam-break are used to validate the precision of the DEM model, the pipe flow model and MPS-DEM coupling model, respectively. Then, the hydraulic conveying with coarse particles in a vertical pipe is simulated. The solid particle distribution is presented and investigated in detail. Finally, the coupling method is successfully applied for the simulation of the liquid-solid flows in a vertical pipe with rotating blades, which shows the stability of the solver under rotating boundary conditions. This fully Lagrangian model is expected to be a new approach for analyzing hydraulic conveying.

Dynamic Effect of Fluid–Structure Interaction and Modal Analysis of Crude–Pipeline Interaction System Considering the Fluctuating Pressure of Medium

“…Dos Santos et al analyzed the FSI of a reduced-order model with Bernoulli–Euler beams and oscillators representing the pipe and the fluid dynamics, respectively ( 12 ). Xie et al simulated the hydraulic transport of coarse particles in a vertical pipe, studied the solid particle distribution in detail, and applied the coupled method successfully to the simulation of liquid–solid flow with rotating blades, showing the stability of the solver under rotating boundary conditions ( 13 ). Bai et al, by combining with the Bernoulli–Euler beam model, established a dynamic model of a cantilever tube conveying fluid with variable densities and analyzed the effects of fluid density fluctuation amplitude, wave number, and initial phase angle on the stability and dynamics of the cantilever tube system ( 14 ).…”