Investigation of Flow, Erosion, and Sedimentation Pattern around Varied Groynes under Different Hydraulic and Geometric Conditions: A Numerical Study

Liang, Chao; Abbasi, Saeed; Pourshahbaz, Hanif; Taghvaei, Poorya; Tfwala, Samkele S.

doi:10.3390/w11020235

Cited by 48 publications

(18 citation statements)

References 23 publications

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“…Obtaining accurate flow field information has always been a topic of concern for science and engineering. Nakagawa et al [9], Muto et al [10], Choufu et al [11], and Duan et al [12] studied the flow behavior around spur dikes. Yaeger [13] studied mean flow and turbulence around a series of straight and angled spur dikes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Influence of Spur Dikes Spacing on Local Scour and Flow

Ning

2019

Applied Sciences

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The spacing of spur dikes is an important consideration for the layout of spur dike channels. This study focuses on the local scour morphology and flow field characteristics of spur dikes with different spacings. The results show that the maximum scour depth is generally found in the vicinity of the first spur dike head. With the increase of the spacing of spur dikes, the shielding effect of the first spur dike is weakened. The maximum velocity in the main flow zone is twice that of the approach flow velocity in the fixed bed. But it is approximately the same as the incoming velocity in equilibrium scouring. The maximum turbulent energy appears to be mainly located in the backflow area of the fourth spur dike in the fixed bed, while the maximum value appears at the second spur dike head in the movable bed. Further, the shear stress decreases as scouring develops. Pearson correlation analysis was carried out between scour depth and shear stress. The analysis results are significantly correlated, indicating that the bed shear stress plays a prominent role in the scouring process. These discoveries can serve as a guide to determine the most reasonable spacing of spur dikes.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Influence of Spur Dikes Spacing on Local Scour and Flow

Ning

2019

Applied Sciences

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“…Although there are several accurate turbulence models (e.g., DNS, LES, and hybrid models), the RNG k-e could match successfully with a large number of meshes. It has been utilized successfully in similar numerical studies in which the local scouring is simulated around a pier [14][15][16] and success in previous studies [17][18][19][20]. The RNG k-e turbulence model equations are referenced to Yakhot et al studies [21].…”

Section: Numerical Modelmentioning

confidence: 99%

CFD simulation of local scouring around airfoil-shaped bridge piers with and without collar

Ghaderi

Abbasi

2019

Sādhanā

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In this paper, the effectiveness of airfoil-shaped pier with and without a collar on local scour depth reduction is numerically investigated utilizing FLOW-3D model. The results show that on a constant T* = VT/D (V: velocity, T: time, D: pier width), increasing the width of the ballet of pier would result on the reduction of maximum scour depth and it would mitigate the scouring depth behind the piers. Also, because of lack of uplift vortices in using airfoil-shaped pier, there would be no scouring behind the piers. Utilizing collar on the airfoilshaped pier would result in a reduction of maximum scouring depth in front of the pier as well and the uplift vortices behind the pier would reduce. Investigation of orientation discipline of the airfoil-shaped pier on flow route shows that the pier which is reversely placed in the flow direction (the keen part in front), will cause the horseshoe vortex to weaken and make the scouring to start from downstream. However, scouring caused by horseshoe vortex in front of the airfoil-shaped pier is strongly more than scouring caused by wake vortex in the rear of the pier.

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“…In principle, real-world flow problems are too complex to be addressed solely by theory or experimentation [20]. A lot of limitations had been identified in physical modelling and recent advancements in numerical methods in solving complex fluid-structure interactions increase its adoption rate [21,22]. In view of the continuous advances in numerical techniques, this study adopts a general purpose CFD software known as FLOW-3D because of its robustness, tendency to numerically reproduceflow and turbulent conditions with clear visualization power at different stages.…”

Section: River Sandmentioning

confidence: 99%

“…The meshing was done using non-conforming mesh blocks. The sensitivity analysis was done according to the results of the FAVOR and total mesh sizes as shown in Figure 4 which translates to computational time as highlighted by [21]. Table 1 summarizes the mesh sizes, total number of grids as well as the downstream velocity (DSV) variations.…”

Section: Meshing and Sensitivity Analysismentioning

confidence: 99%

Modelling of Flow Parameters through Subsurface Drainage Modules for Application in BIOECODS

Abdurrasheed

Yusof

Al‐Qadami

et al. 2019

Water

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The flow resistance of the existing modules in the bio-ecological drainage system (BIOECODS) is high and may lead to flood instead of its mitigation. As part of efforts to enhance the performance of the system, the river engineering and urban drainage research center (REDAC) module was developed. This study modelled the hydrodynamics of flow through this module using FLOW-3D and laboratory experiments for two cases of free flow without module (FFWM) and flow with a module (FWM) to understand and visualize the effects of the module. With less than 5% error between the numerical and experimental results, REDAC module altered the flow pattern and created resistance by increasing the Manning's roughness coefficient at the upstream, depth-averaged flow velocity (43.50 cm/s to about 46.50 cm/s) at the downstream and decreasing water depth (7.75-6.50 cm). These variations can be attributed to the complex nature of the module pattern with further increase across the porous openings. Therefore, the technique used herein can be applied to characterize the behavior of fluids in larger arrangments of modules and under different flow conditions without the need for expensive laboratory experiments.

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Investigation of Flow, Erosion, and Sedimentation Pattern around Varied Groynes under Different Hydraulic and Geometric Conditions: A Numerical Study

Cited by 48 publications

References 23 publications

Numerical Simulation of the Influence of Spur Dikes Spacing on Local Scour and Flow

Numerical Simulation of the Influence of Spur Dikes Spacing on Local Scour and Flow

CFD simulation of local scouring around airfoil-shaped bridge piers with and without collar

Modelling of Flow Parameters through Subsurface Drainage Modules for Application in BIOECODS

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