3D simulation of flow around a single spur dike with free-surface flow

Yazdi, J. Tabatabaie; Sarkardeh, Hamed; Azamathulla, Hazi Mohammad; Ghani, Aminuddin Ab.

doi:10.1080/15715121003715107

Cited by 70 publications

(22 citation statements)

References 15 publications

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“…He observed that when the channel morphological changes were simulated with a series of floods, the initial rectangular channel became a compound channel and the flow pattern changed from a straight stream to a meandering stream. Yazdi et al (2010) simulated the flow pattern around single spur dike in a straight route using k-ε model in Fluent software. They studied the effect of discharge, and length and angle of the spur dike on shear stress distribution.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of mean and turbulent flow in a 180 degree sharp open channel bend: Secondary flow and bed shear stress

2015

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High flow velocity near the free surface in rivers is due to the presence of shear stress near the bed and its absence on the free surface. This phenomenon results in unsteadiness of the vertical velocity profile. Moreover, secondary flows in river bends cause velocity variations, accordingly leading to changes in shear stress near the bed. The present study evaluates and analyzes the effect of streamlines variations, maximum velocity distribution, and secondary flow strength on bed shear stress distribution along a 180 degree sharp bend built in the Hydraulic Laboratory of Persian Gulf University. Results suggest of the occurrence of maximum secondary flow strength at the second half of the bend. The evaluation of bed shear stress distribution using the TKE, modified TKE, and Reynolds methods at turbulent boundary layer demonstrated that the maximum shear stress occurred from the entrance of the bend to the bend apex area near the inner wall. Moreover, comparison of the Reynolds shear stress method at distances of 5 and 15% of the flow depth from the bed indicated that the maximum shear stress occurring at the lower layer moved from the 40 degree cross section to 60 degree cross section at the upper layer.

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Section: Introductionmentioning

confidence: 99%

An experimental study of mean and turbulent flow in a 180 degree sharp open channel bend: Secondary flow and bed shear stress

2015

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“…Flow pattern in a channel bend is influenced widely by the secondary flow and centrifugal force. Yazdi et al (2010) by simulation of flow around a single spur dike found that varying the discharge has little effect on the reattachment length, but changing the length of the spur dike has considerable effects on the dimensions of the recirculation zone. Mousavi et al (2010) investigated the effects of relative curvature for a 908 bend with rigid bed using a T-shaped spur dike for three relative curvatures (2, 3 and 4).…”

Section: Introductionmentioning

confidence: 98%

Effects of relative curvature on the scour pattern in a 90° bend with a T-shaped spur dike using a numerical method

Vaghefi

Safarpoor

Hashemi

2015

International Journal of River Basin Management

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Spur dikes have been usually applied as river-training structures for many years. One of the spur dikes with the proper application in the regulation of rivers is a T-shaped spur dike. In this paper, we study the effects of relative curvature of bend on scour pattern due to installation of a T-shaped spur dike with equal ratio of wing to web length in a 908 channel bend with a moving bed. The spur dike was placed in the outer bank of the middle of the bend at three relative curvatures equal to 2, 3 and 4 in a non-submerged case and 25% of submergence ratio. For analysis the SSIIM 1-1 numerical model was used because it is capable of simulating flows and sediment transport. The k-1 turbulence model was used to analyse turbulent flow and find the Reynolds stresses. It is concluded that by increasing the relative curvature of the bend, the maximum sedimentation increases to 73.3% and the maximum scour increases to 6.3%. In the test case of a 25% submerged spur dike, by increasing the relative curvature of the channels, the amount of scour is increased; with submergence of the spur dike in all relative curvatures the maximum scour is reduced and the maximum power of secondary flow decreased by 31%.

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“…This fraction was used to evaluate the lling level of the molten solder. It was also used to evaluate liquid phase in various CFD applications [13][14][15][16]. Wetting the PCB surface is important during wave soldering.…”

Section: Fluid Ow Modelingmentioning

confidence: 99%

Influence of printed circuit board thickness in wave soldering

et al. 2017

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Abstract. This paper presents a thermal Fluid-Structure Interaction (FSI) study of Printed Circuito Bards (PCBs) during wave soldering. The in uences of PCB thickness on displacement, stress, and temperature distribution are the foci of this study. Five PCB thicknesses (i.e., 0.6, 1.0, 1.6, 2.4, and 3.1 mm) are considered. The paper focuses on a simple PCB with a single hole and is constructed in a three-dimensional model. The thermal FSI of the PCB is solved by uid (FLUENT) and structure (ABAQUS) solvers that are connected using the mesh-based parallel code coupling interface method. Molten solder advancement is tracked using volume-of-uid technique in the thermal uid analysis. ABAQUS solves PCB displacement, von Mises stress, and temperature distributions when high solder temperature is encountered during wave soldering. The correlations of PCB thickness with displacement, von Mises stress, temperature distribution, and molten solder lling time are studied. Results reveal that an increase in PCB thickness yields a linear correlation with solder lling time. Temperature distribution, von Mises stress, and displacement of PCB exhibit polynomial behavior to PCB thickness. A laboratory-scale two-way wave-soldering machine is also used to measure PCB temperature during wave soldering. The predicted temperature of PCB is substantiated by the experimental results.

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3D simulation of flow around a single spur dike with free-surface flow

Cited by 70 publications

References 15 publications

An experimental study of mean and turbulent flow in a 180 degree sharp open channel bend: Secondary flow and bed shear stress

An experimental study of mean and turbulent flow in a 180 degree sharp open channel bend: Secondary flow and bed shear stress

Effects of relative curvature on the scour pattern in a 90° bend with a T-shaped spur dike using a numerical method

Influence of printed circuit board thickness in wave soldering

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