Morphology and hydrodynamics numerical simulation around groynes

Pourshahbaz, Hanif; Abbasi, Saeed; Pandey, Manish; Pu, Jaan H.; Taghvaei, Poorya; Tofangdar, Nafiseh

doi:10.1080/09715010.2020.1830000

Cited by 45 publications

(17 citation statements)

References 38 publications

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“…Recently, numerical approaches using computational fluid dynamics (CFD) were also successfully validated to simulate complex hydraulic phenomena [26,[38][39][40][41][42][43]. It is compulsory to quantify uncertainty for a given confidence level, experimental validation, and uncertainty analysis for engineers [44,45].…”

Section: Verification Of Numerical Model and Laboratory Resultsmentioning

confidence: 99%

On the Effect of Block Roughness in Ogee Spillways with Flip Buckets

Daneshfaraz

Ghaderi

Akhtari

et al. 2020

Fluids

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In this study, the effect of the presence of bed-block roughness in an ogee spillway on energy dissipation and jet length is investigated. A series of experimental and numerical tests were conducted using an ogee spillway with block roughness on the bed without a flip bucket and with a flip bucket at different take-off angles (32 °C and 52 °C). To model the free-flow surface, the volume-of-fluid (VOF) method and turbulence model from RNG k–ε were used. Results indicated that the numerical model is fairly capable of simulating a free-flow surface over an ogee spillway; using block roughness on the spillway chute without a bucket, relative energy dissipation increased by 15.4% compared to that in the spillway with a smooth bed, while for the spillway with 32 °C and 52 °C buckets, it increased by 9.5%. The jet length for a spillway with a flip bucket and roughened bed decreased by 8% to 58% compared to that in a smooth bed. Lastly, the relationships for the estimation of relative energy dissipation and jet length are presented.

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Section: Verification Of Numerical Model and Laboratory Resultsmentioning

confidence: 99%

On the Effect of Block Roughness in Ogee Spillways with Flip Buckets

Daneshfaraz

Ghaderi

Akhtari

et al. 2020

Fluids

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“…The RNG k-ε was proposed by Yakhot and Orszag [41] and represents a modified version of the k-ε standard model. In particular, the RNG k-ε turbulence model has an additional term in its ε equation (see successive Equation ( 14)) that improves the accuracy for quickly strained and swirling flows and also has good accuracy based on the results of numerical investigations by Bayon et al [28], Daneshfaraz et al [35], Ghaderi et al [42], Lauria et al [43], Ghaderi et al [44] and Pourshahbaz et al [45]. The adopted turbulence scheme is a two-equation model that is expressed as:…”

Section: Numerical Modelling Analysismentioning

confidence: 99%

“…To obtain mesh-independent results, three different mesh sizes were used and the grid convergence index (GCI) methodology was employed to select the appropriate mesh, which is a recommended method for evaluating the discretization error; three various computational meshes were applied to choose the appropriate one, e.g., Bayon et al [28], Ghaderi et al [23], and Abbasi et al [46]. This methodology was proposed by Roache [47] and was developed following the Richardson extrapolation method [45]. Cell size was considered the minimum refinement ratio (r = G coarse /G fine ), which was a value of 1.3, as recommended by Celik et al [48].…”

Section: Numerical Modelling Analysismentioning

confidence: 99%

Experimental and Numerical Study of the Effects of Geometric Appendance Elements on Energy Dissipation over Stepped Spillway

Ghaderi

Abbasi

2021

Water

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In the stepped spillway, the steps, by providing an artificial roughening bed, dissipate the flow of energy more than other types of spillways, so the construction costs for stilling basin are reduced. However, what is important in this type of spillway is increasing the effectiveness of steps in the rate of energy dissipation. The present study deals with experimental and numerical simulations regarding the influence of geometric appendance elements on the steps and its impact on the energy dissipation performances, flow patterns properties, turbulent kinetic energy, flow resistance and the Darcy roughness. The localization of inception point of air entrainment is also assessed. To this aim, different configurations are taken into account. The computational procedure is validated with experimental results and then used to test the hydraulic behavior of different geometric configurations. The results showed that the appendance elements on the steps increased the turbulent kinetic energy (TKE) values and Darcy–Weisbach friction and the energy dissipation increased significantly. By reducing the height of the elements, energy dissipation and the TKE value increase more significantly. With the appendance elements on step, the air entrainment inception locations a positioning further upstream than the flat step stepped spillway.

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“…Despite its significant use, the study on spur dyke present in channel bend is still limited (Fazli et al 2008;Vaghefi et al 2019). The majority of studies in this field have been carried out in a straight channel such as Kothyari & Ranga Raju (2001), Jennifer et al (2011), Jiao et al (2017, Kuhnle & Alonso (2013), Pandey et al (2018aPandey et al ( , 2019Pandey et al ( , 2020Pandey et al ( , 2021, Pourshahbaz et al (2020), Singh et al (2020, Xiufang et al (2012) and so on. The flow past a spur dyke present at the channel bend or meander is highly turbulent, leading to the formation of local scour, which further increases with increasing scour depth.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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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Morphology and hydrodynamics numerical simulation around groynes

Cited by 45 publications

References 38 publications

On the Effect of Block Roughness in Ogee Spillways with Flip Buckets

On the Effect of Block Roughness in Ogee Spillways with Flip Buckets

Experimental and Numerical Study of the Effects of Geometric Appendance Elements on Energy Dissipation over Stepped Spillway

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

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