Micropolar fluids commonly represent the complex fluids with microstructure, for example, animal blood and liquid crystals. To understand the behavior of micropolar fluids and the role of micropolar parameters, different micropolar fluids models were implemented by user-defined function in the FLUENT software. The correctness of user-defined function programs was verified comparing to the analytical solution in the Poiseuille flow. Then, the hydrodynamic behavior was analyzed in the Poiseuille flow with a moving particle, slider bearing, and dam break. Numerical results show that microrotation viscosity weakens translational velocity while enhances the pressure of micropolar fluids, in addition, microrotation velocity decreases with the increase in angular viscosity.

微极性流体通常代表具有微观结构的复杂流体，例如动物血液和液晶。为了了解微极性流体的行为和微极性参数的作用，通过FLUENT软件中的用户定义功能实现了不同的微极性流体模型。与Poiseuille流程中的解析解决方案相比，验证了用户定义功能程序的正确性。然后，利用流动的颗粒，滑动轴承和坝破裂，分析了在Poiseuille流中的水动力行为。数值结果表明，微旋转粘度减弱了平移速度，同时增加了微极性流体的压力，此外，微旋转速度随着角粘度的增加而降低。