TY - JOUR

T1 - Effect of vortex generators on the flow around a circular cylinder

T2 - Computational investigation with two-equation turbulence models

AU - Ünal, Uǧur Oral

AU - Gören, Ömer

PY - 2011/3

Y1 - 2011/3

N2 - The paper presents a comparative study based on the 3D computational simulations of the flow around a circular cylinder fitted with vortex generators, benefiting from a series of dedicated model tests conducted in a large circulating water tunnel. The effect of the vortex generators is presented with comparisons including the bare cylinder with no vortex generator case and related experimental data. Incompressible, unsteady Reynolds- Averaged-Navier-Stokes (URANS) computations were performed by using three different two-equation turbulence models, which were Realizable κ-ε, Wilcox κ-ω, and Shear-Stress-Transport k-co models. The numerical calculations emphasized the effectiveness and the performance enhancing character of the vortex generators. Many key findings of the measurements such as the elongation of the near-wake, the extension of the shear layers, the decrease of the stress components and the weakening of the vortices were successfully reproduced with the computations. Significant drag reduction was observed in both experimental and computational study due to the application of the vortex generators.

AB - The paper presents a comparative study based on the 3D computational simulations of the flow around a circular cylinder fitted with vortex generators, benefiting from a series of dedicated model tests conducted in a large circulating water tunnel. The effect of the vortex generators is presented with comparisons including the bare cylinder with no vortex generator case and related experimental data. Incompressible, unsteady Reynolds- Averaged-Navier-Stokes (URANS) computations were performed by using three different two-equation turbulence models, which were Realizable κ-ε, Wilcox κ-ω, and Shear-Stress-Transport k-co models. The numerical calculations emphasized the effectiveness and the performance enhancing character of the vortex generators. Many key findings of the measurements such as the elongation of the near-wake, the extension of the shear layers, the decrease of the stress components and the weakening of the vortices were successfully reproduced with the computations. Significant drag reduction was observed in both experimental and computational study due to the application of the vortex generators.

KW - Bluff body

KW - Circular cylinder.

KW - Two-equation turbulence models.

KW - URAN.S.

KW - Vortex generators.

UR - http://www.scopus.com/inward/record.url?scp=79953822795&partnerID=8YFLogxK

U2 - 10.1080/19942060.2011.11015355

DO - 10.1080/19942060.2011.11015355

M3 - Article

AN - SCOPUS:79953822795

SN - 1994-2060

VL - 5

SP - 99

EP - 116

JO - Engineering Applications of Computational Fluid Mechanics

JF - Engineering Applications of Computational Fluid Mechanics

IS - 1

ER -