Hydrodynamic Flow Patterns Around Three Inline Eccentrically Arranged Circular Piers

Jaman, Hasanur; Das, Subhasish; Kuila, Asim; Mazumdar, Asis

doi:10.1007/s13369-017-2536-9

Cited by 14 publications

(6 citation statements)

References 31 publications

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“…Their results showed that the wake structure and fluid forces are responsible for a slight change in the gap spacing between any two cylinders. Jaman et al [24] conducted an experimental study of scour around three cylindrical piers arranged in a row and zigzag fashion eccentrically, two piers in a streamwise direction, and an eccentric pier at mid-section of two parallel piers. They observed that the energy of the vortex around the front parallel pier, compared with other piers, has the maximum and minimum values, respectively, at the eccentric mid-pier and the rear parallel pier.…”

Section: Introductionmentioning

confidence: 99%

Effect of the position of perpendicular pier groups in a sharp bend on flow and scour patterns: numerical simulation

Asadollahi

Vaghefi

Akbari

2020

J Braz. Soc. Mech. Sci. Eng.

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Numerous bridges are destroyed worldwide every year mostly due to the role of hydraulic factors including scour being ignored when they are designed. Therefore, examination of the scour phenomenon around bridge piers in rivers and identification of the parameters affecting them gain a great level of significance. Particularly, if the bridge piers are installed at river bends, the complicated nature of the flow in bends adds to complications already existent in analysis of flow and scour patterns around such structures, which indicates the need for further study. Hence, the present study has utilized SSIIM numerical model to analyze the three-dimensional flow and scour patterns around perpendicular pier groups (two series of triad parallel piers) at different positions of a bended channel (at the 60-, 90-, and 120-degree angles). The simulated bended channel is a 1-m-wide channel with a central angle of 180 degrees and a relative curvature radius of 2. These data are first compared and confirmed with data collected by acoustic Doppler velocimetry under similar conditions for validation of the numerical data. The results obtained from this model indicated that changing the position of the bridge piers in the channel does not have a significant effect on the maximum scour value; however, the amount of the maximum sedimentation increases by 12% after relocating the piers from the 60-to the 90-degree angle, whereas relocating them from the 90-to the 120-degree position leads to a 42% reduction in the maximum sedimentation.

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Section: Introductionmentioning

confidence: 99%

Effect of the position of perpendicular pier groups in a sharp bend on flow and scour patterns: numerical simulation

Asadollahi

Vaghefi

Akbari

2020

J Braz. Soc. Mech. Sci. Eng.

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“…At square front-pier close to scour hole -value of u/U is a bit lower than square eccentric-pier and square rear-pier. From the past (Jaman et al, 2017a) and current investigation max-u/U is 6.1 % and 4.3 %, respectively, at any location upstream of square front-pier and decreases while it moves down-ward and increases toward bed. Max-u/U near up-stream of scouring region around square front-pier, square eccentric-pier and square rear-pier are acquired approximately 5.4 %, 15 % and 21 %, correspondingly.…”

Section: Tangential Velocitymentioning

confidence: 62%

“…1]. Piers of 7 cm side was considered, for comparing the outcomes between present study and previous studies with two circular-piers (Das and Mazumdar, 2015b), two square-piers (Das and Mazumdar, 20180, and three circular-piers (Jaman et al, 2017a). Longitudinal-gap between square front and eccentric-piers (l) along flow was 66 cm (Das et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…The w + /U on 0° for square eccentric-pier was slightly lesser and for square rear-pier was slightly greater than / wU + on 0° for square front-pier. This occurrence is responsible for reducing and increasing nature of down-flow near the up-stream region of square eccentric-pier and rear square-pier, correspondingly, for the existence of up-flow in reattachment regime (gap between three piers) (Jaman et al, 2017a). Values of max-u + /U, max-v + /U and max-w + /U are observed next to up-stream of square front-piers, square eccentric-pier and square rear-pier with values of 90 %, 80 % and 35 %, correspondingly.…”

Section: Turbulence Fields Analysesmentioning

confidence: 99%

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Computing Equilibrium Flow Structures at Three Interfering Square Piers Causing Relative Scour

Kuila¹,

Jaman²,

Das³

et al. 2020

Contemporary Issues in Computing

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“…In addition, as the aspect ratio increases, the sensitivity to angle of attack grows stronger [4]. Jaman et al (2017) conducted an experimental investigation of the flow properties around triple bridge piers in a channel with a straight path [5]. Keshavarzi et al (2018) examined the flow pattern around two in-line bridge piers with different distances from each other in a laboratory channel with a straight path [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Flow Pattern around Rectangular and Oblong Piers with collar Located in a 180o Sharp Bend

2021

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Flow in river bends is associated with generation of secondary flows that leads to a rather complicated flow pattern around bridge piers located in the bend. In this study, the flow patterns around rectangular and oblong piers models with collar located at the 90 o angle of a 180-degree sharp bend in an experimental plume were investigated. The 3D flow velocity data were collected using a Vectrino velocimeter. The experimental results indicated that the presence of the rectangular pier caused more intense deviation of the streamlines towards the outer bank of the bend. Furthermore, installation of the oblong pier, the maximum secondary flow power and angular velocity were decreased, respectively, by 35% and 45% in comparison with the installation of the rectangular pier. In addition, it was found that the maximum turbulence kinetic energy around the two piers was not significantly different, but by installing the rectangular pier, a region with high values of turbulence kinetic energy is formed at 90° near the inner bank. Also, installation of oblong pier reduces the values of shear stress in comparison with the use of the rectangular pier.

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Hydrodynamic Flow Patterns Around Three Inline Eccentrically Arranged Circular Piers

Cited by 14 publications

References 31 publications

Effect of the position of perpendicular pier groups in a sharp bend on flow and scour patterns: numerical simulation

Effect of the position of perpendicular pier groups in a sharp bend on flow and scour patterns: numerical simulation

Computing Equilibrium Flow Structures at Three Interfering Square Piers Causing Relative Scour

Investigation of Flow Pattern around Rectangular and Oblong Piers with collar Located in a 180o Sharp Bend

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