A NUMERICAL STUDY OF OSCILLATING FLOW AROUND A CIRCULAR-CYLINDER
A NUMERICAL STUDY OF OSCILLATING FLOW AROUND A CIRCULAR-CYLINDER
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DOI：
10.1017/s0022112091001040
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发表时间：
1991-01-01
影响因子：
3.7
通讯作者：
JUSTESEN, P
中科院分区：
文献类型：
--
作者：
JUSTESEN, P
本文给出了在亚临界雷诺数范围内小Keulegan-Carpenter数（KC）下，平面振荡圆柱绕流的Navier-Stokes方程的流函数涡量公式的数值解结果。 用有限差分法求解方程组。 对于很小的KC（小于或等于1），数值结果符合解析解。 随着KC的增加，初始分离和不稳定性导致的不对称流动与旋涡脱落的预测。 在小KC值的计算流场进行了比较，流动可视化，并发现良好的协议为中等β值（几乎等于250）。 该模型预测了具有横向涡街、单对、双对和三对脱落的有据可查的流态。 虽然在最高Re值下流动不能完全解析，但在频率参数β的三个不同值（范围196-1035，0 < KC < 26）下，计算的阻力系数和惯性系数与实验数据的比较显示出很好的一致性。
This paper presents results obtained from a numerical solution to a stream function-vorticity formulation of the Navier-Stokes equations for the flow around a circular cylinder in planar oscillating flow at small Keulegan-Carpenter numbers (KC) in the subcritical Reynolds number (Re) range. The equations are solved by finite-difference methods. For very small KC (less-than-or-equal-to 1), the numerical results coincide with analytical solutions. As KC is increased, the incipient separation and instability leading to an asymmetrical flow with vortex shedding are predicted. Computed flow fields at small KC values are compared to flow visualizations, and good agreement is found for moderate beta-values (almost-equal-to 250). The well-documented flow regimes with the transverse vortex street, single-, double- and three-pair shedding, are predicted by the model. Although the flow is not fully resolved for the highest Re values, comparisons of calculated drag and inertia coefficients with experimental data for three different values of the frequency parameter beta in the range 196-1035 for 0 < KC < 26 show good agreement.