Experimental Investigation on 3D Flow around a Single T-Shaped Spur Dike in a Bend

Vaghefi, Mohammad; Ghodsian, Masoud; Akbari, Maryam

doi:10.3311/ppci.7999

Cited by 10 publications

(4 citation statements)

References 17 publications

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“…The study of the secondary flow strength [39,40] along the bend, accompanied by the T-shaped spur dike and the attractive and repelling protective structure of different angles and a magnified illustration of the spur dikes area are presented in Fig. 11.…”

Section: Secondary Flow Strengthmentioning

confidence: 99%

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

Vaghefi

Faraji

Akbari

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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This piece of research simulated the flow pattern around a T-shaped spur dike in the vicinity of attractive and repelling protective structures in a 90°bend using computational fluid dynamic (CFD) model. This CFD analysis has utilized RNG turbulence model to simulate turbulent flow field, and free surface variations were modeled through finite volume of fluid. A comparison between mean velocities in the main spur dike field was indicative of an acceptable precision of CFD model in simulating flow pattern along river bends in the presence of a spur dike. This numerical model mainly aimed at a scrutinizing study of the process of flow pattern around the T-shaped spur dike, the maximum velocity variations, the secondary flow strength, and the maximum stresses along the bend and the main spur dike field. Results demonstrated an increase in the maximum shear stress in attractive and repelling modes of the protective structure by 23.5 and 17.6%, respectively, in comparison with the vertical mode.

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Section: Secondary Flow Strengthmentioning

confidence: 99%

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

Vaghefi

Faraji

Akbari

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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“…For a single T-shaped spur dyke located at an angle of 75-degree (from the entry) in a 90-degree bend, the strength of secondary flow and vorticity gradually increases from the beginning of bend to maximum value at section 74-degree. It then decreases till the exit of the bend (Vaghefi et al 2017). Therefore, it says that these vortices might be formed due to interaction between the longitudinal velocity component of flow and secondary flow.…”

Section: Graphical Abstract Introductionmentioning

confidence: 97%

Numerical investigation of flow field around T-shaped spur dyke in a reverse-meandering channel

Tripathi

Pandey

2021

Water Supply

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In this paper the flow characteristics near around T-shape spur dyke situated in reverse meandering channel having rigid bed is simulated using Renormalization Group (RNG) turbulence model with an ANSYS 2018 Fluent software. To solve the model in 3D ways we used Navier-Stroke's equation based on principle of conservation of mass and momentum within a moving fluid. For studying the flow characteristics, Computational Fluid Dynamics ware applied with all geometric parameter and the turbulence was simulated using (RNG) equations of model. In this simulation the structured meshes are used with different diameter and diameter of meshes is high at exit channel for obtaining accuracy in result. In this study we mainly focus on effect of Froude number on flow pattern and several other characteristics like velocity distribution, flow separation, bed shear stress distribution. The final result of this research work is compare with the condition when no structure is present in the channel.

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“…As computational technology has developed by leaps and bounds, Computational Fluid Dynamics (CFD) has been used widely in the study of local scour topography of structures. Vaghefi 11 investigated the flow field around a T-shaped spur dike located in a 90° bend. The results showed a significant effect of the spur dike on the secondary flow patterns.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and mechanism of local scour reduction around spur dike using the collar in clear water

Qi,

Wang,

Zou

et al. 2024

Sci Rep

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To reduce the local scour around the spur dike, the U-shaped collar is proposed in this study. The influence of the collar's length, width, and porosity on the local scour reduction in clear water is studied by model tests and numerical simulations. Experimental studies show that the collar has a significant effect on reducing the local scour. The location of the maximum scour depth of the spur dike moves downstream. The width of the collar has the greatest impact on the reduction effect among the three selected factors, followed by the porosity and the length. Local scour reduction efficiency of the collar can reach 56.9%. Based on the regression analysis of the range and variety, a formula for predicting the reduction effect around the spur dike is put forward, and the deviation between the values by formula and that in experiments are within ± 4%. The characteristics of the flow field around the spur dike under constant conditions with a collar are studied via numerical simulation. The numerical simulation results show that compared to the case without collar, the flow velocities around the spur dike in cases with permeable collar and solid collar reduced by 45% and 25%, respectively, and the shear stresses reduced by 20% and 28.6%, respectively. The results of this study can provide a reference for local scour reduction using the solid collar or collar made of permeable materials such as gabions.

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Experimental Investigation on 3D Flow around a Single T-Shaped Spur Dike in a Bend

Abstract: The flow field around a T-shaped spur dike located in a 90°

Cited by 10 publications

References 17 publications

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

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

Numerical investigation of flow field around T-shaped spur dyke in a reverse-meandering channel

Characteristics and mechanism of local scour reduction around spur dike using the collar in clear water

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