圆形域内串列双柱振动诱导的定常整流流动的数值模拟

Numerical Simulation of the Steady Streaming Flow Induced by Two Oscillating Tandem Cylinders in a Circular Container

本文在ε１和Ｒｓ≥０（１）下采用贴体网格生成、数值求解ＮＳ方程研究圆形域内串列等直径双柱作同频同相小振幅振动在静止粘性不可压缩流体中诱导的Ｓｔｏｋｅｓ层外的定常整流旋涡流动。数值结果表明，流场外边界的存在使大于临界雷诺数时外边界附近产生高阶分离旋涡，在很小的整流雷诺数变化范围内造成整流流谱改变。串列双柱柱间距的增加及圆域对振动柱柱径比的减小都使发生高阶分离的临界整流雷诺数之值下降。

A steady streaming vortex flow out of the Stokes layer is studied in this paper by the numerical simulation of NS equations in a fitted body grid with the conditions of ε 1 and Rs ≥ 0(1). This flow is induced by two oscillating cylinders in an incompressible rest viscous fluid in the circular container.Two cylinders oscillate with the same diameter,same oscillating frequency and same phase at the condition of small amplitude and are arranged in tandem along x axis. It is found that the secondary separated vortex flow is generated near the container wall due to the outer solid boundary of flow field if the streaming Reynold’s number is larger than the critical Reynold’s numbers.And streaming flow patterns can be changed in a very small range of the streaming Reynold’s number. The critical streaming Reynold’s number becomes smaller at the larger distance between two cylinders or at the smaller diameter ratio of container and cylinder.