非牛顿流体搅拌流场的数值模拟研究进展

Progress in the numerical simulation for agitated flow field of non-Newtonian fluid

对非牛顿流体搅拌流场数值模拟过程中的控制方程、旋转桨叶的处理以及数值计算方法三个方面进行了综合论述。阐述了广义牛顿流体模型形式简单、计算量低,在非牛顿流体搅拌流场数值模拟过程中应用广泛;黏弹性流体本构方程具有高度的非线性,采用计算流体力学(CFD)方法对其搅拌流场进行数值模拟难度较高,目前仍处于起步阶段;通过合理简化黏弹性流体本构方程以及采用恰当的数值离散方法,有助于在黏弹性流体的搅拌流场数值模拟中取得进展。

The progress in numerical simulation for agitated flow field in stirred tank of non-Newtonian fluid is reviewed from three aspects, the control equations, the treatment of rotational impeller and the numerical methods. The generalized Newtonian fluid models are commonly adopted in the numerical simulation for non-Newtonian fluid for their advantages of simpleness in form and low computational complexity. The constitutive equations for viscoelastic fluid are highly nonlinear, which leads to a great difficulty in the study using computational fluid dynamics （CFD） method on the viscoelastic flow field in stirred tank, thus the correspond investigation is just at a preliminary stage. Reasonable simplification for the constitutive equations of viscoelastic fluid and application of proper numerical discretization method would be helpful to the progress in the simulation for viscoelastic fluid flow field in stirred tank.