Wake-boundary layer interaction subject to convex and concave curvatures and adverse pressure gradient

Tulapurkara, E. G.; Khoshnevis, Abdolamir Bak; Narasimhan, J. L.

doi:10.1007/s003480100337

Cited by 12 publications

(9 citation statements)

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“…Also, the free stream velocity on flat section is about u ref = 17.5 m/s. In case 2, the experimental measurements are obtained by Tulapurkara et al [18]. In this case, the flat plate is 900 mm long and 140 mm high.…”

Section: Test Casesmentioning

confidence: 99%

“…It is useful to express the difference between the measurement and the computation. In this study, equation (18) has been employed to calculate the mean percentage difference between numerical and measured values at each station. The summation is carried out perpendicular to the wall for points where measured values are available Err = 100 (numerical − experimental) experimental N P (18) Table 2 summarized the mean percentage difference between numerical and measured values of turbulent intensities and x-velocity component at various stations for the case where u ref = 12, β = 0.62.…”

Section: Error Analysismentioning

confidence: 99%

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The Effect of Adverse Pressure Gradient on the Structure of Turbulent Boundary Layer

Khoshnevis

Farzaneh–Gord

Hariri

2010

Proceedings of the Institution of Mechanical Engineers, Part G:

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The effects of adverse pressure gradient (APG) on turbulent boundary layer flow are studied in this article using numerical methods. The values of pressure gradient are simulated by Clauser's parameter (β). The non-linear eddy-viscosity model (NLEVM) assumption has been employed to model turbulence. Moreover, applications have shown non-linear model to be far more reliable than the linear eddy-viscosity model (LEVM), particularly in flows subjected to APG and in other situations where normal straining is a major contributor to stress generation. Based on numerical solutions, turbulent intensity and turbulent shear stress and also mean velocity are calculated. The results show that the characteristics of turbulent boundary layer flows with APGs differ significantly from those of zero-pressure-gradient ordinary boundary layers. The numerical results show that more changes in the turbulent structure are induced directly by APG. The turbulent intensities and turbulent shear stress are increased by the effect of APG compared with flat plates under the same conditions. The numerical results also unveiled that the APG causes flow to be destabilized. The rate of integral parameters of the boundary layer such as momentum thickness and displacement thickness is increased as APG parameter increases and also when compared with the flat plate case. To validate the numerical results, a comparison has been made with previous experimental values and direct numerical simulation (DNS) data. Generally, good agreement has been obtained between numerical and measured values.

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Section: Test Casesmentioning

confidence: 99%

Section: Error Analysismentioning

confidence: 99%

The Effect of Adverse Pressure Gradient on the Structure of Turbulent Boundary Layer

Khoshnevis

Farzaneh–Gord

Hariri

2010

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…E G Tulapurkara, V Ramjee and J L Narasimhan have studied various aspects of boundary layers, wakes and wake-boundary layer interactions subjected to pressure gradient and curvature, e.g. Tulapurkara et al (1996Tulapurkara et al ( , 2001. Studies on flow past S-shaped blades involving convex and concave curvatures in succession and pressure gradient have been carried out.…”

Section: Some Examples Of Boundary Layer Research In Indiamentioning

confidence: 99%

Hundred years of the boundary layer — Some aspects

Tulapurkara

2005

Sadhana

Self Cite

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The concept of the boundary layer was proposed by Ludwig Prandtl in 1904. This concept has allowed prediction of skin friction drag, heat transfer from the wall and separation of the boundary layer, which in turn enables proper design of airplanes, ships, other vehicles and equipment through/around which fluid flow takes place. The centenary of the proposal by Prandtl is being celebrated in various ways. This article is an attempt at presenting some of the developments in boundary layers. The article begins with a brief description of Prandtl's work. Subsequent sections deal with (a) a brief account of his 1904 paper, (b) some aspects of developments in boundary layer research and applications, (c) discussion of a few contributions from India in the area of boundary layers, and concluding remarks.

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“…The APG plays a significant role in such engineering devices. The flow could become unstable if a turbulent boundary layer flow encounters large APG and, consequently, the flow would separate from the surface (Lee and Sung, 2008;Spalart and Watmuff, 1993;Tulapurkara et al, 2001;Liu et al, 2002;Knopp et al, 2014). Many important features of APG flows are quite well understood.…”

Section: Introductionmentioning

confidence: 98%

“…Most results are acquired either from experiments (Spalart and Watmuff, 1993;Tulapurkara et al, 2001;Liu et al, 2002;Knopp et al, 2014) , direct numerical simulation (DNS) (Coleman and Kim, 2003) or large eddy simulation (LES) (Inoue et al,2013). However, DNS and LES are still limited to simulating relative simple flows with low Reynolds number and experiments are expensive and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Turbulence model investigations on the boundary layer flow with adverse pressure gradients

Zhao

Zong

Zou

et al. 2015

J. Marine. Sci. Appl.

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In this paper, a numerical study of flow in the turbulence boundary layer with adverse and pressure gradients (APGs) is conducted by using Reynolds-averaged Navier-Stokes (RANS) equations. This research chooses six typical turbulence models, which are critical to the computing precision, and to evaluating the issue of APGs. Local frictional resistance coefficient is compared between numerical and experimental results. The same comparisons of dimensionless averaged velocity profiles are also performed. It is found that results generated by Wilcox (2006) k-ω are most close to the experimental data. Meanwhile, turbulent quantities such as turbulent kinetic energy and Reynolds-stress are also studied.

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Wake-boundary layer interaction subject to convex and concave curvatures and adverse pressure gradient

Cited by 12 publications

References 0 publications

The Effect of Adverse Pressure Gradient on the Structure of Turbulent Boundary Layer

The Effect of Adverse Pressure Gradient on the Structure of Turbulent Boundary Layer

Hundred years of the boundary layer — Some aspects

Turbulence model investigations on the boundary layer flow with adverse pressure gradients

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