Formation and interaction of multiple secondary flow vortical structures in a curved pipe: transient and oscillatory flows
| 作者： | Mohammad Reza Najjari, Christopher Cox, Michael W. Plesniak |
| 作者单位： |
11 Biofluid Dynamics Laboratory , Department of Mechanical and Aerospace Engineering , The George Washington University , 800 22nd Street NW , Washington , DC 20052 , USA |
| 刊名： | Journal of Fluid Mechanics, 2019, Vol.876 , pp.481-526 |
| 来源数据库： | Cambridge University Press Journal |
| DOI： | 10.1017/jfm.2019.510 |
| 原始语种摘要： |
$180^{\circ }$]]> curved pipe are investigated both numerically and experimentally to understand secondary flow vortex formation and interactions. The results of numerical simulations and particle image velocimetry experiments are highly correlated, with a low error. To enable simulations in a smaller domain with shorter inlet section, an analytical solution for the unsteady Navier–Stokes equation is obtained with non-zero initial conditions to provide physical velocity profiles for the simulations. The vorticity transport equation is studied and its terms are balanced to find the mechanism of vorticity transfer to structures in the curved pipe. Several vortices are identified via various vortex identification (ID) methods and their results are compared. Isosurfaces of the |
