摇摆条件对湍流流动特性的影响

利用Fluent软件对摇摆条件下矩形管内的湍流流体进行理论分析,分析了多种湍流模型和多个参数对流动特性的影响。在摇摆条件下,矩形管中心区域速度分布趋于均匀化,但壁面附近的速度梯度增大,从而使摩擦阻力系数增加。壁面会对摇摆条件对湍流流体的影响产生抑制作用。在纵摇条件下,小长宽比矩形管内速度等高线成哑铃状分布。对于本文的计算流体,摇摆条件下的湍流摩擦阻力系数与Re的0.47次方成反比。

Theoretical Research on Effect of Rolling Motion on Turbulent Flow

The turbulent flow in rectangular tube at rolling motion was investigated theoretically with Fluent code. The effects of several turbulent models and parameters on the flow were analyzed. At rolling motion, the velocity profile in tube center is more averaged. But the velocity gradient and frictional resistance coefficient on the wall increase. The effect of rolling motion on the turbulent flow can be depressed by the tube wall. At pitching motion, the velocity contour in small length-width ratio tube is in a dumbbell shape. As to the turbulent flow in the paper, the frictional resistance coefficient at rolling motion is in inverse ratio with the power of 0.47 of Reynolds number.