基于材料变粘度模型的摩擦液柱成形CFD数值模拟

CFD numerical simulation of friction hydro pillar processing based on fluid model of varying viscosity

采用Gambit软件建立了摩擦液柱成形过程流场二维轴对称变粘度模型,运用商业计算流体动力学(CFD)软件Fluent对单元成形过程中稳态阶段塑性金属的流动情况进行了数值模拟。通过改变模拟过程中的进给速度或旋转速度,保持其他参数不变的情况下分析了塑性金属速度场、压力场的变化情况,对比了理想等粘流体模型和实际变粘流体模型的差异。结果表明,金属棒的进给速度对流体压力场的影响显著;随着旋转速度的增加,金属棒壁面以及底部的流体速度显著增加,该区域是单元成形过程中的主要产热区。

A two-dimensional axisymmetric viscosity model of friction hydro pillar processing （FHPP） was established based on Gambit software.Using the commercial Computational Fluid Dynamics （CFD） software Fluent,the numerical simulation of plastic met~ flow pattern was carried out in steady phase of FHPP.While keeping the other parameters constantly during the process of numerical simulation,the velocity field and static pressure field distribution change of viscosity metal plastic fluid during the forming process were analyzed by changing only one critical parameter respectively, such as the rotary speed and the feed rate of metal stud, compared the difference between the ideal and the viscosity fluid model.The results showed that the influence of the feeding speed of the metal stud on the fluid pressure field were significant;the fluid velocity in the inner wall and bottom of the metal stud increased significantly when the velocity of the metal stud increasing, and this cell was the main heat produced zone.