LES Research on Flowing Characteristics of Turbulent Flow in Rectangular Tubes in Rolling Motion
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摘要: 采用FLUENT软件和大涡模拟方法对摇摆条件下矩形通道内的湍流流体进行了理论研究,分析了各种摇摆条件和矩形通道尺寸对湍流流体流动特性的影响。结果表明,当矩形管比较窄时,管壁会抑制摇摆运动对湍流流体的影响;当摇摆幅度比较小时,摇摆运动对湍流流体的影响比较小;随着矩形管长宽比的减小,管壁上湍流摩擦阻力系数逐渐减小,并呈波形曲线分布或斜坡状分布;当摇摆幅度比较大时,矩形管内流体会在π/2相位时先出现倒流现象;随着摇摆周期的减小,管壁上的摩擦阻力系数先减小,然后增加。Abstract: The turbulent flow in rectangular tubes in rolling motion is investigated theoretically with FLUENT code and large eddy simulation.The effects of rolling motion and tube size on the flowing characteristics of turbulent flow are analyzed.The results show that if the rectangular tube is narrow,the effect of rolling motion on the turbulent flow can be depressed by the tube wall.If the rolling amplitude is small,the effect of rolling motion on the turbulent flow is very limited.With the decrease of length-width ratio of the tube,the turbulent frictional resistance coefficient decreases.The frictional resistance coefficient is in a wave or slope shape.If the rolling amplitude is big,the counter flow occurs first at the π/2 phase.With the decrease of rolling period,the frictional resistance coefficient on the wall decreases first,and increases later.
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Key words:
- Rolling /
- Rectangular tube /
- Turbulent flow /
- Large eddy simulation
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