The following results are obtained : ( 1 ) the flow in rotating helical pipes are affected by dean number , curvature , torsion ( or germano number ) , the ratio of the coriolis force to the centrifugal force f number ( or rossby number ) and the geometry of the cross section 研究结果表明： ( 1 )旋转螺旋管道流动特性受dean数、曲率、挠率(或germano数) 、科氏力与离心力之比f数(或rossby数)以及截面的形状五种因素的影响。
2.
Three - dimensional flow over flat wall is simulated by virtue of large eddy simulation . the subgrid model is germano dynamical model and the numerical difference scheme is center difference scheme of two - order precision . the outcomes can be validated by its experimental counterpart 亚格子模型采用germano动力模型模拟，数值差分格式采用具有二阶精度的中心差分格式对平壁流动进行三维大涡模拟，模拟结果通过与实验结果的比较得到验证。
