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Effects of vortex induced vibrationson cylinders in tandem configurationat critical Reynold numbers
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aerodynamics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Vortex-induced vibrations (VIV) and wake interference on circular cylinders have

reached a lot of research attention over the years. However, most research is done

for relativly low Reynold numbers (sub-critical) and does not correspond to real

world chimney situations. A real chimney in the south of Sweden has experienced

some large vibrations and data gathered from this chimney shows a correlation

between these motions and wind directions. Results from 2D CFD simulations used

to simulate VIV on a circular cylinder when laying in the wake of another larger, and

fix, cylinder at critical Reynold numbers are presented in this thesis. Simulations

are done for three cases; one single cylinder, for comparisons, and two simluations

for cylinders in tandem arrangement, at 35 and 70 m respectively. Results show

that the cylinder when in tandem arrangement experience much larger vibrations

than the single cylinder. For velocities above 10 m/s the tandem arrangement can

lead to resonance on the cylinder, which is not occuring in the case with a single

cylinder. This thesis shows that even at distances of 70 m, wake interference can

have a large effect on VIV and more advanced models and simulations would be

useful for better predictions of the behaivor of chimneys.

Place, publisher, year, edition, pages
2014. , 44 p.
TRITA-AVE, ISSN 1651-7660 ; 2014:31
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-159876OAI: diva2:787497
Available from: 2015-02-10 Created: 2015-02-10 Last updated: 2015-02-10Bibliographically approved

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