The second mechanism, "Pull," also limits WIP by making the production velocity of the upstream process dependent on the downstream consumption velocity.
The bigger the downstream water level, the outstanding of variation degree of axial velocity along radius distribution when upstream water level is same.
下游水位越高，变化相同的上游水位时，轴向流速沿径向分布的变化程度越大。
3
The computed characteristic scales of the upstream vortex show distinguished three-dimensionality and vary with the velocity ratio and the water depth.