Effect of blockage on vortex-induced vibrations at low Reynolds numbers

Prasanth, T. K.; Behara, Suresh; Singh, Satya Prakash; Kumar, R. Ajith; Mittal, Sanjay

doi:10.1016/j.jfluidstructs.2006.04.011

Cited by 116 publications

(53 citation statements)

References 24 publications

(28 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the three cases considered, the magnitude of response and range of lock-in is maximum when the cylinder vibrates with an additional in-line DOF. The maximum value of Yresponse, 0.6703D, attained at Re = 80, is quite higher than the one (≈ 0.6D) reported by Prasanth (2009) The in-line motion results from drag on the cylinder. Since drag is positive throughout, the in-line motion is executed only over x>0 region of the domain.…”

Section: Overview Of the Cylinder Responsementioning

confidence: 53%

“…For an undamped square cylinder, Sen andMittal (2015, 2016) obtained complete hysteresis-free solutions for m * = 1. In contrast, undamped VIV results of a circle by Prasanth and Mittal (2008) and Prasanth (2009) suggest that secondary hysteresis is always present. Further studies are needed to capture fully hysteresis-free solutions (if they exist) in a freely vibrating body with curved contours.…”

Section: Discussionmentioning

confidence: 74%

See 1 more Smart Citation

On the Response of a Freely Vibrating Thick Elliptic Cylinder of Low Mass Ratio

Sourav¹,

Sen²

2017

JAFM

View full text Add to dashboard Cite

Two-dimensional space-time finite-element simulations are carried out to study the free vibrations of a rigid elliptic cylinder of aspect ratio 1.11 and low non-dimensional mass of unity. Undamped transverse-only as well as two-degrees-of-freedom oscillations are considered. The effect of damping is investigated on transverseonly motion. For all three cases, results for cylinder response are presented for 50≤Re≤180. In the absence of damping, transverse oscillations are mostly periodic except for a very narrow region near the end of lock-in. In contrast, a damping of 0.044 removes quasi-periodicity as well as secondary hysteresis from flow and body motion. For undamped motion, inclusion of in-line oscillations excites high amplitude oscillations, widens the range of synchronization and delays phase shift between lift and cross-stream response. In each case, synchronization between cylinder oscillations and vortex-shedding is 1:1. In addition, drag-lift phase plots are symmetric about mean lift (= 0) line. Thus, symmetrical shedding of two equally strong alternate vortices per oscillation cycle forms 2S, CNW(2S) or C(2S) modes. For each case, the lower branch initiates at Re = 65 where the oscillation or shedding frequency is found to be locally maximum.

show abstract

Section: Overview Of the Cylinder Responsementioning

confidence: 53%

Section: Discussionmentioning

confidence: 74%

On the Response of a Freely Vibrating Thick Elliptic Cylinder of Low Mass Ratio

Sourav¹,

Sen²

2017

JAFM

View full text Add to dashboard Cite

show abstract

“…In the present study upstream and downstream lengths are 6D and 24D, whereas Camarri et al (2010) have taken 12.5D and 35.5D due to low blockage effect, Prasanth et al (2006) used the inlet and outflow boundary at 10D, 25.5 D respectively from the cylinder center. But in present study due high confinement, flow can be stabilized earlier so that the upstream and downstream lengths 6D and 24D are good enough for capturing the vortex shedding characteristics.…”

Section: Problem Statementmentioning

confidence: 99%

Cross Flow past Circular Cylinder with Waviness in Confining Walls near the Cylinder

Deepakkumar

Jayavel

Tiwari

2017

JAFM

View full text Add to dashboard Cite

Two dimensional flow past circular cylinder confined by walls with local waviness near the cylinder has been studied. The aim of the present study is to identify the ability of the waviness to control vortex shedding, for which two different waviness configurations such as in-phase configurations (IPC) and out-phase configurations (OPC) are considered. Further, the effect of location of the local waviness with respect to the cylinder has also been studied. Air is the working fluid and the flow is assumed to be laminar and incompressible at Re=200. The finite volume based CFD solver Ansys Fluent (Version 15.0) is used for the computations. Flow characteristics such as drag, lift and Strouhal number are computed. Interesting shedding characteristics and drag reduction are observed due to the presence of local waviness. However, the significant factor is the location of waviness in the confining walls that leads to complete suppression of shedding. Among various locations and configurations of waviness studied, waviness in downstream with OPC3 suppresses the vortex shedding completely with reduced drag.

show abstract

“…Mittal et al [6] investigated effect of the blockage ratio on numerical simulation for flow past circular cylinder at Re ≤ 150 with a stabilized space-time finite element formulation, γ = 1% and 5%. From literature as mention above and in the past, the most applicable engineering design data for flow past over circular, squre cylinder, rectangular, trangle and isosceles trapezoidal are emphasis intense investigated but more absence applicable engineering design data for right trapezoidal cylindrical cross section in which to used in barred tee engineering design.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of two-dimensional laminar unsteady flow past a right trapezoidal cylinder at low Reynolds number: study of sharpening angle, time step, grid independence and domain size

Lamtharn

Pimsarn

2018

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. Numerical simulation of two-dimensional laminar unsteady flow past a right trapezoidal cylinder at low Reynolds number (Re = 100), zero of the flow approaching angle and sharpening angle of the right trapezoidal of 22.5 o with a side ratio B/A = 1 are carried out to provide more applicable data for engineering design of barred tee in aspect of structural integrity. A finite volume method, non-uniform meshing with second-order implicit time discretization into eightnode quadratic quadrilateral finite elements is employed. An incompressible flow SIMPLEC code with constant fluid properties is used. The convective terms using a third-order QUICK scheme. The numerical simulation result is compared against the published results of flow past a square cylinder. The effect of sharpening angle on the response of the right trapezoidal cylinder is investigated. A special study of the effects of flow on significant factor for time step, grid independence, blockage ratio, domain size, upstream and downstream extents, size domain next to cylinder and size domain extent are performed systematically. The Strouhal number and RMS lift coefficients of fully saturated flow are calculated. The result shown that increasing of sharpening angle, the Strouhal number is negligible changed whilst the RMS lift coefficients significantly increased.

show abstract

Effect of blockage on vortex-induced vibrations at low Reynolds numbers

Cited by 116 publications

References 24 publications

On the Response of a Freely Vibrating Thick Elliptic Cylinder of Low Mass Ratio

On the Response of a Freely Vibrating Thick Elliptic Cylinder of Low Mass Ratio

Cross Flow past Circular Cylinder with Waviness in Confining Walls near the Cylinder

Numerical simulation of two-dimensional laminar unsteady flow past a right trapezoidal cylinder at low Reynolds number: study of sharpening angle, time step, grid independence and domain size

Contact Info

Product

Resources

About