Vortex dislocation characteristics of a dual-step cylinder in low-Re flow Online publication date: Thu, 28-May-2020
by Chunning Ji; Xiaoxiao Yang; Yuting Cui; Weilin Chen
International Journal of Computer Applications in Technology (IJCAT), Vol. 62, No. 4, 2020
Abstract: Flow around a dual step cylinder for D/d = 2 and L/D = 5 at a low Reynolds number of ReD = 200 is numerically investigated utilising the immersed boundary method. The vortex dislocation caused by two steps is investigated. It was found that a pair of streamwise vortex - the centre vortex exists at the downstream of the large cylinder. Meanwhile, due to the barrier effect of the centre vortices, a very weak L-cell exists behind the centre of the large cylinder. In a complete dislocation cycle, three positive and negative half-loop connections appear alternately. This cycle is related not only to the phase realignment of the different vortex cells, but also to the connection realignment. Moreover, the lateral velocity is always dominated by the vortex shedding frequency. While in the streamwise velocity spectra, the vortex shedding frequency gradually dissipates in the downstream, leaving lower frequencies of dislocation.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Computer Applications in Technology (IJCAT):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com
Our Blog 
Follow us on Twitter 
Visit us on Facebook