Numerical study on the vortex motion patterns around a rotating circular cylinder and their critical characters

✍ Scribed by Guo-Ping Ling; Tsi-Min Shih

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 356 KB
• Volume: 29
• Category: Article
• ISSN: 0271-2091
• DOI: 10.1002/(sici)1097-0363(19990130)29:2<229::aid-fld788>3.0.co;2-p

✦ Synopsis

A hybrid finite difference and vortex method (HFDV), based on the domain decomposition method (DDM), is used for calculating the flow around a rotating circular cylinder at Reynolds number Re= 1000, 200 and the angular-to-rectilinear speed ratio h (0.5, 3.25) respectively. A fully implicit third-order eccentric finite difference scheme is adopted in the finite difference method, and the deduced large broad band sparse matrix equations are solved by a highly efficient modified incomplete LU decomposition conjugate gradient method (MILU-CG). The long-time, fully developed features about the variations of the vortex patterns in the wake, as well as the drag and lift forces on the cylinder, are given. The calculated streamline contours are in good agreement with the experimentally visualized flow pictures. The existence of the critical state is confirmed again, and the single side shed vortex pattern at the critical state is shown for the first time. Also, the optimized lift-to-drag force ratio is obtained near the critical state.