Numerical investigation of flow pattern around a T-shaped spur dike in the vicinity of attractive and repelling protective structures

Vaghefi, Mohammad; Faraji, Behrooz; Akbari, Maryam; Eghbalzadeh, Afshin

doi:10.1007/s40430-017-0954-y

Cited by 18 publications

(7 citation statements)

References 33 publications

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“…The main advantage of SSIIM model over other CFD [37] software programs is in its capability to model the sediment transport on the live bed in complicated geometries with high accuracy [38,39].…”

Section: Numerical Modelmentioning

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: Numerical Modelmentioning

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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“…SSIIM (Shaheed et al, 2018;Vaghefi et al, 2019; (Kumcu, 2017;Vaghefi et al, 2018) based on the Finite Volume Method, which solves Navier-Stokes equations based on the standard K-ε turbulence model (Nguyen et al, 2018). This model is used to disassemble equations over the finite volume from the Power-Law scheme or Second-Order Upwind algorithm.…”

Section: Numerical Modelmentioning

confidence: 99%

Flow Field in a Sloped Channel with Damaged and Undamaged Piers: Numerical and Experimental Studies

Oveici

Tayari

Jalalkamali

2021

KSCE Journal of Civil Engineering

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This paper analyzed the flow pattern around damaged and undamaged bridge piers in a channel with a mild slope. The experiments were carried out on a straight channel with a length of 12 meters and a slope of 0.008. Acoustic Doppler velocimeter (ADV) was employed to collect three-dimensional flow velocity data, and the results were analyzed and compared with particle image velocimetry (PIV) data. Sediment Simulation in Intakes with Multiblock option (SSIIM) was incorporated for the numerical simulation of the flow in this study. Generally, the results obtained from the comparisons referred to the appropriate agreement between the numerical and the experimental data. The results showed that an undular hydraulic jump occurred at a distance of two meters from the channel entrance in every case; the maximum bed shear stress in the sloped channel was 12 times that in a horizontal channel for installing two damaged and undamaged piers. With this position of the piers in the sloped channel, the upstream water level underwent a 72.5% reduction compared to similar conditions in a horizontal channel, while the amount of this water level decrease was equal to 8.3% compared to the other cases in a sloped channel. In addition, with the presence of both piers, the maximum Froude number was 5.7 times that in a horizontal channel. Open channel flowBridge pier Hydraulic jump Bed shear stress Acoustic Doppler velocimeter CORRESPONDENCE Omid Tayari

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“…Aamir and Ahmad [27] investigated the flow characteristics of 2D horizontal jets and subsequent scour, and analyzed the effect of roughness of stiff apron on such characteristics. Studies have also been carried out to study the flow pattern and scour around other hydraulic structures [28][29][30][31][32][33]. It is quite evident that the primary emphasis of investigation has been the examination of flow characteristics and derivation of empirical equations for different After pioneering investigations by Rouse [1], a number of researchers have investigated scour due to wall jets [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rough Rigid Apron on Scour Downstream of Sluice Gates

Aamir

Ahmad

Pandey

et al. 2022

Water

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Presented in this paper is an experimental study on scour downstream of rough and smooth stiff aprons under the influence of wall jets. The effect of various parameters on asymptotic scour depth is studied. The analysis of data reveals that maximum scour depth reduces with increasing sediment size, sluice opening, and apron length. It is directly proportional to densimetric Froude number. Maximum equilibrium scour depth initially decreases with increasing tailwater level (up to a minimum), but thereafter an increase is observed. The effect of roughness of stiff apron on scour is studied and quantification of decline in maximum scour depth due to roughness is carried out. Scour profiles and their temporal variation are also studied. A regression-based equation to predict equilibrium scour depth under smooth and rough apron is proposed, which conforms to experimental data. Based on the conclusions of this study, it is recommended to use roughness over the surface of stiff apron to confine scour under-wall jets.

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Numerical investigation of flow pattern around a T-shaped spur dike in the vicinity of attractive and repelling protective structures

Cited by 18 publications

References 33 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

Flow Field in a Sloped Channel with Damaged and Undamaged Piers: Numerical and Experimental Studies

The Effect of Rough Rigid Apron on Scour Downstream of Sluice Gates

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