An Investigation on Suppression of Vortex Instabilities for Flow Past a Bluff Body Using a Passive Device

A. S. Sunil; P. S. Tide

doi:10.15866/ireme.v11i2.10833

An Investigation on Suppression of Vortex Instabilities for Flow Past a Bluff Body Using a Passive Device

A. S. Sunil^(1*), P. S. Tide⁽²⁾

^(*) Corresponding author

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DOI: https://doi.org/10.15866/ireme.v11i2.10833

Abstract

The present paper aims at investigating the effectiveness of using a passive device on the suppression of vortex instabilities during a fluid flow past a bluff body. A study of fluid flow parameters for the flow past a bluff body fitted with straight fins and helical strakes is presented. A three dimensional numerical investigation is performed on the bluff body for different designs of the fins and helical strakes. A circular cylinder of a diameter of 4cm is used as bluff body. The simulation is carried out for a water flow past a stationary cylinder with Reynolds number 28000. A numerical simulation was performed in a three dimensional computational domain using RANS equations and SST k-ω turbulence model. To reduce the frequency of the vortex shedding, the bluff body is attached with a passive device. The investigation observed that the attachments of straight fins and helical strakes on the surface are found to be highly effective in diminishing the vortex instabilities formed around the structure.The changes in the flow field are analyzed by observing the changes in flow parameters like Drag force and Strouhal number. The results were found to be in reasonable agreement with the available data in the literature. The use of helical strakes largely reduces Vortex induced vibrations (VIV) so that they can be used for the protection of underwater cables used in offshore structures.
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Keywords

Straight Fins; Strouhal Number; Vortex Instabilities; Drag Force

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References

Inoue, Iwakam, and Hatakeyama, Aeolian tones radiated from flow past two square cylinders in a side-by-side arrangement, Physics of Fluids, 18(4), 046104,2006

Ali, M.S.M., Doolan, C.J., Wheatley, V. (2009). Grid convergence study for a two dimensional simulation of flow around a square cylinder at a low Reynolds number. In: Seventh International Conference on CFD in The Minerals and Process Industries,2009.

T. Zhou, S.F. Mohd. Razali, Z.Hao, L.Cheng., On the study of vortex induced vibration of a cylinder with helical strakes. Journal of Fluids and Structures 27903–917,2011
http://dx.doi.org/10.1016/j.jfluidstructs.2011.04.014

Shan Huang, Andy Sworn, Hydrodynamic coefficients of two fixed circular cylinders fitted with helical strakes at various staggered and tandem arrangements, Applied Ocean Research 43, 21–26,2013
http://dx.doi.org/10.1016/j.apor.2013.06.001

Lee KeeQuen, Investigation on the effectiveness of helical strakes in suppressing VIV of flexible riser. Applied Ocean Research 44 82–91,2014
http://dx.doi.org/10.1016/j.apor.2013.11.006

Shan Huang, VIV suppression of a two-degree-of-freedom circular cylinder and drag reduction of a fixed circular cylinder by the use of helical grooves, Journal of Fluids and Structures 27,1124–1133,2011
http://dx.doi.org/10.1016/j.jfluidstructs.2011.07.005

Rathakrishnan, E., Bluff Body Edge Effect on Pressure-Hill and Zone of Influence, (2014) International Review of Mechanical Engineering (IREME), 8 (4), pp. 662-666.

Kumaravel, G., Jeyajothiraj, P., Rathakrishnan, E., Formation and Dissipation of Karman Vortex Street in an Accelerating Flow Past a Circular Cylinder, (2015) International Review of Aerospace Engineering (IREASE), 8 (2), pp. 43-55.
http://dx.doi.org/10.15866/irease.v8i2.5846

Adebayo, D., Rona, A., PIV Study of the Flow Across the Meridional Plane of Rotating Cylinders with Wide Gap, (2015) International Review of Aerospace Engineering (IREASE), 8 (1), pp. 26-34.
http://dx.doi.org/10.15866/irease.v8i1.5290

Beigmoradi, S., Ramezani, A., Effect of the Backlight Angle on the Aero-Acoustics of the C-Pillar, (2013) International Review on Modelling and Simulations (IREMOS), 6 (3), pp. 988-993.

Adebayo, D., Rona, A., The Persistence of Vortex Structures Between Rotating Cylinders in the 106 Taylor Number Range, (2015) International Review of Aerospace Engineering (IREASE), 8 (1), pp. 16-25.
http://dx.doi.org/10.15866/irease.v8i1.5288

Rostane, B., Aliane, K., Abboudi, S., Three Dimensional Simulation for Turbulent Flow Around Prismatic Obstacle with Rounded Downstream Edge Using the k-ω SST Model, (2015) International Review of Mechanical Engineering (IREME), 9 (3), pp. 266-277.
http://dx.doi.org/10.15866/ireme.v9i3.5719

Barata, J., Multiple Jet/Wall/Crossflow Interactions, (2014) International Review of Aerospace Engineering (IREASE), 7 (3), pp. 69-83.

Aloui, F., Kourta, A., Ben Nasrallah, S., Experimental Study of Synthetic Jets with Cross Flow in Boundary Layer, (2016) International Review of Aerospace Engineering (IREASE), 9 (1), pp. 13-21.
http://dx.doi.org/10.15866/irease.v9i1.9130

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