Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

MPS-DEM Method for Particle Effects on Mixed Transportation Characteristics of Horizontal Pipeline
Xuanjing Pan1, Zhiyuan Wei2, Decheng Wan1*1

Computational Marine Hydrodynamics Lab (CMHL), School of Naval Architecture, Ocean and Civil Engineering,
Shanghai Jiao Tong University, Shanghai, China
2Marine Design & Research Institute of China, Shanghai, China*Corresponding author

BK, Parida A (2013) found that after full development, the Reynolds
number in the pipeline is very large, which will generate a lot of large
turbulence, moreover, the shape, quantity and position of the solid
particles are uncertain, there will be many difficulties in analyzing theproblem.
Generally speaking, for the problem of liquid-solid two-phase flow inultra-long pipelines, the experimental method is expensive and costly,
which is generally not used. However, the method of numericalsimulation has high repeatability and low cost, and it is generally usedfor research. The shapes of marine ores are different. In order tohighlight the key points of the problem, the spherical shape isconsidered to represent the average ore shape. The numericalsimulations of liquid and solid phases are mainly related by couplingmethods. The coupling types are mainly divided into Euler-Euler typeby Messa GV, Malavasi S (2015), Euler-Lagrange type by Uzi A, Levy
A (2018) and Lagrange- Lagrange type. The Euler-Euler type is also
known as the two-fluid type, that is, the Euler method is used to study
both liquids and solids. This method is relatively simple to deal with,
but the calculation accuracy is not high because it cannot accurately
simulate the physical processes such as particle-to-particle collisions;
The Euler-Lagrange type is based on the different characteristics ofliquids and solids. The Euler method is used to study liquids and theLagrange method is used to study solids, which can ensure thecalculation accuracy of the collision process between particles andparticles. The amount of calculation is not too high, so that it iscurrently the most widely used. Among them, Zhou et al. (2019)conducted a series of parameter studies on the pipe flow problem under
this method; The Lagrange-Lagrange type is to use the Lagrange
method to study both liquids and solids. This method fully guarantees
the accuracy of the solution of liquids and solids, especially in the caseof large-scale motion problems. The range of movement is very large,
and the computational advantage is reflected. So far, there are almost
no precedents for using the Lagrange-Lagrange method to solve thethree-dimensional super-long pipe flow problem. For the MPS-DEM
approach, only a handful of research teams have done some relevant
work. For example, Li et al. (2019) modeled 3D non-Newtonian solidliquid flow with free surfaces using DEM-MPS, and Harada et al.
(2019) performed numerical simulations of the dynamics of beachslope morphology based on a coupled DEM-MPS model. Xie et al.

ABSTRACTIn recent years, with the development of ship and ocean engineering tothe deep sea, people pay more and more attention to the ore mining andtransportation in the deep sea. Deep sea mineral transportation involves
horizontal pipeline transportation. The horizontal pipeline has thecharacteristics of large slenderness ratio and high liquid velocity.
Considering the complexity of this problem and the problem of solidliquid two-phase flow, this paper intends to study this problem by using
the combination of moving particle semi implicit method (MPS) anddiscrete element method (DEM). It is a new attempt to use MPS
method to simulate liquid flow in pipeline, and DEM method is aparticle numerical method based on discontinuous medium assumption,
which is especially suitable for solving solid particles in mixed
transportation by averaging ore shape with spherically shaped solidparticles.
The process and details of mixed transportation in ultra long horizontal
pipeline are not clear. In this paper, periodic boundary conditions areused to splice multiple sections of pipes to form an ultra long horizontal
pipeline. Based on the MPSDEM-SJTU solver independently
developed by our research group, the particle motion state and flow
field information under different solid particle concentration conditions
are analyzed. These results are expected to provide reference for setting
transportation parameters and optimizing transportation conditions.

KEY WORDS: Ultra long horizontal pipeline, Solid liquid mixed
transportation, MPS method, DEM method, Particle concentration.

INTRODUCTION
In recent years, the mining of marine ore has gradually attracted
people's attention. Chung et al. (2021) made some summary work on
deep-sea mining. Generally speaking, the length of the horizontal
pipeline is very large so that the liquid-solid two-phase flow problem
involved is very complicated. Oh J, Jung J (2015, 2018) did series work.
What’s more, when the liquid flow rate in the pipeline is small, it willcause the solid particles to accumulate and block in the pipeline, so theliquid flow rate in the horizontal pipeline is generally set to be large.
Miedema SA (2015) have done research in this area. Senapati PK, Mishra57