用格子Boltzmann RK颜色梯度模型研究有障碍物通道中的双层不混溶流体流动

IF 2.4 Q3 ENERGY & FUELS
S. Channouf, Y. Admi, M. Jami, M. Moussaoui
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引用次数: 4

摘要

本文采用点阵玻尔兹曼方法(LBM),利用Rothman-Keller颜色梯度模型在二维计算域中模拟了非混相流体在方形障碍物上的两相流动。该模型基于多相Rothman-Keller描述,用于分离流动中的两种流体,并评估其在处理流过方形障碍物的两种流体时的效果,目的是通过调节两种流体的粘度来减少湍流。这种湍流会导致诸如气液流动中的界面跟踪技术和管道中向上或向下的共电流流动等重大问题。因此,本研究的目的是通过改变两种不同粘度的流体来代替单一流体,以减少或完全消除湍流。结果表明,要在障碍物后形成稳定、平行、无重叠的流动,流体的黏度差必须较大。黏度比的增大缩短了障碍物后旋涡消失的时间。本文的研究结果得出了一些一般性的结论:当M≥2时,黏度差的增大导致流体间摩擦力增大,平均流动速度减小,障碍物后旋涡消失所对应的时间缩短。然而,当M≤1/2时,情况正好相反。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of Two Layered Immiscible Fluids Flow in a Channel with Obstacle by Using Lattice Boltzmann RK Color Gradient Model
Lattice Boltzmann method (LBM) is employed in the current work to simulate two-phase flows of immiscible fluids over a square obstacle in a 2D computational domain using the Rothman-Keller color gradient model. This model is based on the multiphase Rothman-Keller description, it is used to separate two fluids in flow and to assess its efficacy when treating two fluids in flow over a square obstacle with the objective of reducing turbulence by adjusting the viscosities of the two fluids. This turbulence can cause major problems such as interface tracking techniques in gas-liquid flow and upward or downward co-current flows in pipes. So, the purpose of the study is to replace a single fluid with two fluids of different viscosities by varying these viscosities in order to reduce or completely eliminate the turbulence. The results show that to have stable, parallel and non-overlapping flows behind the obstacle, it is necessary that the difference between the viscosities of the fluids be significant. Also, showing that the increase in the viscosity ratio decreases the time corresponding to the disappearance of the vortices behind the obstacle. The results presented in this work have some general conclusions: For M≥2, the increase in the viscosity difference leads to an increasing of friction between fluids, reducing of average velocity of flow and decreasing the time corresponding to the disappearance of the vortices behind the obstacle. However, for M≤1/2, the opposite occurs.
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来源期刊
CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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