有三个不同的颗粒流动区。
在第三流动区，可以近似用牛顿流体流阻方程计算流阻。
The loss in the third fluid area can be calculated approximately by the newtonian fluid pressure loss equation.
主流区无粘流动采用了边界元法计算，粘性流动区采用附面层理论的积分关系式计算。
Boundary element calculation is applied to the main flow field, while integral methods of the boundary layer theory are applied to the viscous layers.
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