【摘要】 为验证拉格朗日 欧拉方法的准确性 ,对高分子溶液的 2∶1绕圆柱流动问题进行了数值模拟 ,采用单松弛时间的PhanThien Tanner本构方程 ,得到PIB/C14溶液在De =0 93的绕流计算结果 ,同Baaijens等所做的绕流实验中的稳态流场物理量的测量结果进行了比较 ,在定量上取得较好的一致性 .证明拉格朗日 欧拉方法能够在定性上乃至在定量上准确地预报高分子复杂流体的流动行为 ,在描述真实的物理过程时是合理、准确的更多还原

【Abstract】 The Lagrangian\|Eulerian algorithm was used for simulating flow past a confined cylinder with 1∶2 diameter/wall ratio.The one\|mode Phan\|Thien and Tanner(PTT) constitutive model was used in the present calculation.Profiles of both velocity and stresses are obtained at different sections of the steady flow,and compared with laser Doppler velocimetry and flow\|induced birefringence data given by Baaijens et al. for a polyisobutylene/tetradecane(PIB/C14) contraction flow at Deborah number De =0 93.Overall,the simulation has reproduced the experimental results with good accuracy,the agreement between the numerical predictions and the experimental results is fairly well.In addition,the dimensionless drag on the cylinder is reported to be a monotonically decreasing function of the Deborah number,and agrees well with the numerical results of Dou and Phan\|Thien.更多还原