scholarly journals A Numerical Simulation Study of the Migration Law of Water-Sand Two-Phase Flow in Broken Rock Mass

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Feng Du ◽  
Guanghui Jiang ◽  
Zhanqing Chen
Keyword(s):  
Rock Mass ◽  
Two Phase Flow ◽  
Economic Losses ◽  
System Dynamic Model ◽  
Phase Flow ◽  
Characteristic Parameters ◽  
Two Phase ◽  
Fortran Language ◽  
Flow Theories ◽  
Migration Law

When the upper parts of coal resources are exploited, the mining overburden separated strata may easily connect with the upper unconsolidated aquifers. This may cause the water-sand two-phase fluids in the aquifers to flow underground through the falling broken rock mass. It has been found that it is difficult to eliminate sand after it has entered a mine, which tends to severely restrict the restorations of mines and causes significant economic losses. This paper studied a seepage system dynamic model of water-sand two-phase fluids in broken rock mass based on related two-phase flow theories. In addition, using FORTRAN language, it established a numerical calculation program to study the migration law of water-sand two-phase fluids flowing into broken rock mass and determined the main influencing factors on the seepage characteristic parameters of water-sand two-phase fluids in broken rock mass and the amounts of sand losses.

Numerical Simulation of Softness Abrasive Two-Phase Flow Field on Level Set Method

2010 ◽  
Vol 154-155 ◽  
pp. 197-201
Author(s):  
Shi Ming Ji ◽  
Xiao Xing Weng ◽  
Da Peng Tan
Keyword(s):  
Topological Structure ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Characteristic Parameters ◽  
Two Phase ◽  
Abrasive Flow Machining ◽  
Mechanics Model ◽  
And Control

The soft abrasive flow machining was proposed for solving the problems of difficult contact finishing in course of mould manufacturing. It could reach the specular level and control turbulence abrasive flow. Based on the topological structure transformation of LSM, a two- dimensional model of the two-phase flow is established. This mechanics model with the SIMPLE (semi-implicit method for pressure-linked equations) algorithm incorporated is used to simulate the movement of the turbulent flow by using of k-ε model. The computed results show that this 2D model can preferably simulate the movement of the two-phase flow, and the characteristic parameters of abrasive two-phase flow are derived.

scholarly journals A comparison between the presence and absence of virtual viscosity in the behaviour of the two phase flow interface

2021 ◽  
pp. 163-163
Author(s):  
Iman Abbaspour ◽  
Vahid Shokri ◽  
Morteza Abbasi
Keyword(s):  
Two Phase Flow ◽  
Numerical Study ◽  
Phase Flow ◽  
Governing Equations ◽  
Two Phase ◽  
Stability Range ◽  
Long Wavelength ◽  
First Order ◽  
Instability Range ◽  
Fortran Language

In this paper, a numerical study is performed in order to investigate the effect of the virtual viscosity on simulation of separated two-phase flow of gas-liquid. The governing equations solved by shock capturing method which can provide predicting the interface without the flow field solving. In this work, in order to calculate the numerical flux term, first-order centred scheme (Force scheme) was applied cause of its accuracy and appropriate validation. Analysis approves that the obtained stability range of this research is consistent with the classic Kelvin-Helmholtz instability equation only for the long wavelength with small amplitude. Results reveal that when the wavelengths are reduced, the specified range is not consistent and wavelength affects on instability range and it is over predicted. An algorithm for water faucet problem was developed in Fortran language. Short wavelength perturbations induce unbounded growth rates and make it impossible to achieve converging solutions. The approach taken in this article has been to adding virtual viscosity as a CFD technique, is used to remedy this deficiency.

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