Dead zone area at the downstream flow of barrages

Sauida, Mohamed F.

doi:10.1016/j.asej.2015.08.002

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…Equation (3) presents the separation line as a part of ellipse, and shows better description for the separation line between current flow and dead zone flow (reverse flow and weak forward flow), which coincides with Ref. [9]. The length of the flow separation zone, and the area of dead zone flow seems to be nearly the same at different planes (0.2Y, 0.5Y, and 0.8Y), consequently the plane of separation can be considered vertical from the water surface to the channel bed.…”

Section: Plane Of Separationsupporting

confidence: 80%

“…(6) represents the separation line accurately, which coincides with Ref. [9]. As the number of closed vents increases, the flow passes through a limited width of channel, and the maximum width of dead zone (W) increases comparing to the length of flow separation (L), and consequently the dimensionless length of separation (W/L) increases by increasing the expansion ratio (e).…”

Section: Plane Of Separationsupporting

confidence: 73%

“…A theoretical description of the separation zone between current flow and dead zone flow (reverse flow and weak forward flow) in a sudden expanding stilling basin downstream of multi-vent regulators, as a part of an ellipse is practically verified by plotting velocity vectors [9]. The results show that, the percentage area of dead zone to the area through length of separation depends mainly on the expansion ratio, with maximum value of 81% for operated side gates.…”

Section: F Sauida/ Department Of Water Engineering Faculty Of Enginementioning

confidence: 88%

“…According to Ref. [9], for simplicity, assume that the plane of flow separation is vertical and does not change from the water surface to the bed. The plane of separation is considered as a smooth solid boundary between the current flow and the dead zone flow (reverse flow and weak forward flow).…”

Section: Iequationof Plane Of Separationmentioning

confidence: 99%

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Length Of Flow Separation

F¹

2016

Fouth International Conference on Advances in Civil, Structural and Construction Engineering - CSCE 2016

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Flow separation is a natural phenomenon encountered at some cases downstream of multi-vent regulators. The main flow is divided into current flow and dead zone flow (reverse flow and weak forward flow). The length of flow separation must be taken into consideration downstream of regulators for canal side's protection and accurate flow measurement. The present study aims to analyze the flow separation downstream of regulators in sudden expanding stilling basin. An extensive experimental program has been conducted on a regulator model of five vents at the Hydraulic Research Institute (HRI). Empirical model based on the results of the dimensional analysis is proposed within this study to compute the dimensionless length of separation by using multiple linear regression analysis. Results revealed that the empirical model proposed can be used for practical applications in canal side's protection and flow measurements downstream of hydraulic structures. Keywordsseparation of flow, length of flow separation, sudden expanding channel, hydraulic structures, and velocity vectors.sides and the minimum distance of flow measurement downstream of multi-vent regulators based on the maximum width of flow separation zone only.

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Section: Plane Of Separationsupporting

confidence: 80%

Section: Plane Of Separationsupporting

confidence: 73%

Section: F Sauida/ Department Of Water Engineering Faculty Of Enginementioning

confidence: 88%

Section: Iequationof Plane Of Separationmentioning

confidence: 99%

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Length Of Flow Separation

F¹

2016

Fouth International Conference on Advances in Civil, Structural and Construction Engineering - CSCE 2016

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Study on the Unsteady Flow of the Approach Channel’s Entrance

Wang

Zhu

et al. 2023

Lecture Notes in Civil Engineering

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The entrance of shiplock’s approach channel always exist a mixing shear layer caused by the shear mixing layer, where is the junction of main river flow and the quiescent water of the approach channel. The flow structure of the turbulent mixing area presented as large-scale vortices frequently and periodically. And the fluctuations of the water surface and velocity induced by the separation of vortices may threat the navigation conditions, which should be considered during the engineering designing. The existing studies regard the mixing shear layer as steady flow and only take care of the average shear velocity, which may underestimate the harm of the shear flow. In this work, RNG k-ε model and LES model were adoped to study the hydraulic characteristics of the entrance. The vortex characteristics and the influence on the water level and velocity were analyzed. Results shown that LES model had better precision than RNG k-ε model in the unsteady characteristics. Then further studies about the recirculation flow were performed with LES model, The length and period of the recirculation flow was studied. It found that the vortex was generated at the upstream of shear zone, and then transferred with the recirculate flow until it was collapsed. All the above provide references for hydraulic characteristics of the entrance.

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Dead zone area at the downstream flow of barrages

Cited by 2 publications

References 5 publications

Length Of Flow Separation

Length Of Flow Separation

Study on the Unsteady Flow of the Approach Channel’s Entrance

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