Flow over Broad Crested Weirs: Comparison of 2D and 3D Models

Al-Hashimi, Shaymaa A. M.; Madhloom, Huda M.; Khalaf, Rasul M.; Nahi, Thameen N.; Al‐Ansari, Nadhir

doi:10.17265/1934-7359/2017.08.005

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…(40,41) Fast development of CFD has observed; eventually, one may use it to build a spillway without first subjecting one to costly and time-consuming laboratory testing to examine the effect of dams and similar hydraulic structures. (42) The performance of Fluent 2D and Flow 3D numerical models was studied by Ammar et al (43) and Assim et al (22,49) to model the movement of water over the Ogee Dam.…”

Section: Flow Pattern Modeling With Numerical Modelsmentioning

confidence: 99%

Flow Patterns Modeling over Spillway: Review Study

Ibrahim,

Kamel

2024

Salud, Ciencia y Tecnología - Serie de Conferencias

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A spillway dam, constructed concurrently with concrete or masonry, is a vital infrastructure designed to provide the controlled release of surplus water that surpasses the dam's storage capacity. Since the Ogee spillway is among the best and most well-known worldwide, it deserves study. Weir flow, inertia, and gravity are crucial in many open-channel applications. Consequently, hydraulic performance data between model and prototype structures are commonly scaled using Froude similitude. As the upstream head decreases in a weir flow, the surface tension and viscosity forces become more important, perhaps to the point where Froude scaling fails to achieve complete model-prototype similarity. Size-scale effects are responsible for various alterations to the head-discharge connection, the nappe trajectory, and air entrainment. Hydraulic parameters were explored in this work utilizing Flow3D software to find weir geometry optimization using the CFD method. In addition, this study attempted to evaluate flow on various parts of crested weirs in three different models.

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Section: Flow Pattern Modeling With Numerical Modelsmentioning

confidence: 99%

Flow Patterns Modeling over Spillway: Review Study

Ibrahim,

Kamel

2024

Salud, Ciencia y Tecnología - Serie de Conferencias

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“…To achieve this, Al-Hashimi et al [2] conducted laboratory tests on a large dam surface and measured the water surface in it. They then looked into the accuracy of the results of the experiments and made predictions using the triple and double fluency program based on the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Comparing the 3D Flow Behavior Around Different Bridge Pier Shapes Using CFD-Fluent: Implications for Reducing Local Scour

Ahmed,

Ismael

2024

MMEP

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The current study deals with simulation of 3D-flow around three different types of bridge pier shapes on a flatbed surface. The main objective of this article is to explore how water flows around various types of bridge piers. In this article, the CFD-Fluent (k-epsilon) turbulence model was used to simulate the flow turbulence around untraditional piers named upstream facing aero-foiled shaped pier (US-FASP) and downstream facing aero-foiled shaped pier (DS-FASP) and were compared with the circular pier, Results from the experiments were compared to the expected flow velocity (m/s), turbulent kinetic energy (TKE), and other variables. The results of the threedimensional simulation of the water flow behavior and turbulent kinetic energy around the three various designs of bridge piers support that. The findings suggest that (DS-FASP) is the most effective sort of form to employ since it allows water to flow around it extremely smoothly, resulting in minimal obstruction of the water flow in addition to the lowest TKE. In this investigation, root mean errors were used. mean squared errors (MSE), mean absolute errors (MAE), and both the correlation coefficient (R) and the root mean square error (RMSE). The findings also demonstrated that the type of form (DS-FASP) outperformed pavements with other diverse shapes in terms of performance. From this, it was found that the turbulent kinetic energy (TKE) and longitudinal velocity (u) had mean least square errors (MSE) of 1.5E-0 and 7.6E-08, respectively, and coefficients (R 2 ) of 0.92 and 0.98. The shape of a wake vortex in a wake region is captured by the (k-epsilon) model. The k-epsilon turbulence model showed good similarities with the experimental results. The study's findings suggest that local cleaning in the vicinity of bridge piers can be scaled back in the future.

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3D modeling and simulation of thermal effects during profile grinding

Schieber

Hettig

Zaeh

et al. 2020

Prod. Eng. Res. Devel.

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A new heat transfer model for profile grinding was developed to analyze distortions caused by residual tensile stresses in linear guide rails. The simulative analysis of the thermal effects caused by a non-uniform heat source on the surface using the finite element method depends on an accurate representation of the locally variable contact area. The complexity of the V-groove profile disqualifies a 2-dimensional simulation approches so far used in the literature. This paper focuses on the redefinition of these mathematical relationships of the process parameters and the resulting heat flux. The heat flux model is adapted to the geometry of the workpiece depending on the grinding parameters and approximating the V-groove of a linear guide rail. This 3-dimensional modeling allows a better understanding of the thermo-metallurgical effects that occur during the grinding process. Furthermore, the calculation of the internal stresses induced into the workpiece material through the grinding process is possible. The simulation model results in a generally valid model for the analysis of distortions. In order to confirm the validity of the new heat flux profile, a comparison of the different finite element simulation results was made and experiments under wet grinding conditions were conducted. The results show that the newly developed grinding process model allows a more accurate prediction of workpiece distortion caused by grinding forces and temperatures. This research also offers a new approach to a method based on a 2-dimensional implementation developed in the literature for predicting the distortions of linear guide rails and a derivation of possible simulation-based compensation strategies.

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Flow over Broad Crested Weirs: Comparison of 2D and 3D Models

Cited by 5 publications

References 8 publications

Flow Patterns Modeling over Spillway: Review Study

Flow Patterns Modeling over Spillway: Review Study

Comparing the 3D Flow Behavior Around Different Bridge Pier Shapes Using CFD-Fluent: Implications for Reducing Local Scour

3D modeling and simulation of thermal effects during profile grinding

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