English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Two-dimensional numerical simulations have been performed to understand theeffect of wall proximity on the vortex-induced vibrations (VIV) of anelastically mounted circular cylinder having two degrees of freedom for gapratios g/D = {0.1,0.2,0.3,0.4,0.5,0.6}, where D is the cylinder diameter, and gis the gap between the cylinder's bottom surface and the wall. Parametricsimulations have been performed using a quasi-monolithic coupledfluid-structure interaction solver with exact interface tracking for Re = 100and m*=10 over a range of U* to present the effect of the wall's proximity onthe vibration response, vortex structures, force dynamics, pressuredistribution, the phase between the hydrodynamic forces and displacements, andfinally different VIV branching response regimes. The numerical simulationsreveal that as the gap ratio reduces, the maximum transverse vibrationamplitude reduces, and the lock-in region widens. Periodic vortex shedding witha single "S" vortex street has been observed for all gap ratios g/D = 0.1 to0.6. It has also been observed that the wall proximity affects the mean liftcoefficient not only in the lock-in region but also in the pre and post lock-inregions. In the lock-in region, the response dynamics of the vibrating cylindercan be characterized into two branches, with the transition between thebranches marked by a sudden jump in the phase angle $\Phi$ between the lift andtransverse displacement from 0 to a value slightly greater than $\pi$. As thegap ratio reduces, the widening of the lock-in region is accompanied by thewidening of the IInd response branch and a narrowing down of the Ist responsebranch. For the gap ratio of g/D = 0.1, the Ist branch vanishes entirely. Thiswork is directly relevant to the design, maintenance, and fatigue lifeestimation of underwater pipelines/cables laid on the seabed.

Two-Dimensional Numerical Analysis on Vortex-Induced Vibrations of an Elastically Mounted Circular Cylinder Placed Very Close to a Wall