当前位置: X-MOL 学术Fluid Dyn. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A comparative study on instability of steady flows in helical pipes
Fluid Dynamics Research ( IF 1.5 ) Pub Date : 2020-03-19 , DOI: 10.1088/1873-7005/ab6618
A Yu Gelfgat

A computational study of three-dimensional instability of steady flows in a helical pipe of arbitrary curvature and torsion is carried out for the first time. The problem is formulated in Germano coordinates in two equivalent but different forms of the momentum equation, so that results obtained using both formulations cross verify each other. An additional formulation in the cylindrical coordinates is applied for a limiting case of the toroidal pipe. The calculations are performed by the finite volume and finite difference methods. Grid independence of the results is established for both steady flows, the eigenvalues associated with the linear stability problem, and the critical parameters. The calculated steady flows agree well with experimental measurements and previous numerical results. The computed critical Reynolds numbers corresponding to the onset of oscillatory instability agree well with the most recent experimental results, but disagree with the earlier ones. Novel results related to the parametric stability study are reported.

中文翻译:

螺旋管中稳态流动不稳定性的比较研究

首次对任意曲率和扭转的螺旋管中稳态流动的三维失稳进行了计算研究。该问题在 Germano 坐标中以两个等价但不同形式的动量方程表示,因此使用这两种公式获得的结果可以相互验证。圆柱坐标中的附加公式适用于环形管的极限情况。计算是通过有限体积和有限差分方法进行的。为稳定流、与线性稳定性问题相关的特征值和关键参数建立了结果的网格独立性。计算出的稳定流与实验测量和先前的数值结果非常吻合。计算出的对应于振荡不稳定开始的临界雷诺数与最近的实验结果非常吻合,但与早期的结果不一致。报告了与参数稳定性研究相关的新结果。
更新日期:2020-03-19
down
wechat
bug