Volume of Fluid Model of Open Channel Contraction

Datta, I. A. M.; Debnath, Koustuv

doi:10.1007/s40032-014-0118-0

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…[10] In (2014) I. Datta • K. Debnath studied effect of Channel contraction on fluent using three different contraction ratios ( 0.77, 0.61, 0.44) and found out that within the contracted region, the longitudinal mean velocity as well as the turbulent intensity increased with decrease in contraction ratio. [11] The authors also found out that turbulent kinetic energy and dissipation rate also increased with decrease in contraction ratio, especially near contracted zone and channel bottom which are the regions of turbulence production and dissipation. Goel et al (2015) presented a study to develop a device for measuring discharge from laboratory and irrigation stations.…”

Section: Introductionmentioning

confidence: 88%

Flow Transition Due to Width Contraction

Mittal¹,

Kumar²,

Choudhary³

2023

JERA

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This study analyses an open channel flow’s transition due to contraction of width. The flow is initially subcritical (i.e. Fr < 1). Comparison between theoretical and experimental study is done to analyse the minimum contracted width such that if the width of the downstream section is more than this minimum contracted width flow can take place without any change in upstream specific energy. The abbreviated term suggests that the width of the open channel decreases and that leads to changes in the flow values of the differentiation from the others produced above. The dimensions of many water streams, which satisfy proper hydraulic conditions, may not be compatible with the designed dimensions of an irrigation work that needs to be constructed in some locations. The design requirements of such irrigation works may involve a contraction in the channel width in the required location. Then 2 models are prepared on ANSYS fluent one having width 0.190m which is more than the minimum contracted width and other having width of 0.1m which is less than minimum contracted width. Then the results are presented in the form of contours of volume fraction on the wall of model which validates the theoretical changes in upstream and downstream depths of flow in each case.

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Section: Introductionmentioning

confidence: 88%

Flow Transition Due to Width Contraction

Mittal¹,

Kumar²,

Choudhary³

2023

JERA

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“…The roughness constant was set to 0.5. 3 The fluid domain initializes with only air at atmospheric condition. This means that water is added continuously to an empty channel (with air) at startup.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…They recognized that the occurrence of a “level jump” depends on fluid properties, length of the flume, and computational time. Datta and Debnath 3 used the volume of fluid (VOF) model for an open channel with different contraction ratios. They observed that turbulence intensity increases as the contraction ratio decreases.…”

Section: Introductionmentioning

confidence: 99%

Flow regime changes at hydraulic jumps in an open Venturi channel for Newtonian fluid

Welahettige

Lie

Vaagsaether

2017

The Journal of Computational Multiphase Flows

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The aim of this paper is to study flow regime changes of Newtonian fluid flow in an open Venturi channel. The simulations are based on the volume of fluid method with interface tracking. ANSYS Fluent 16.2 (commercial code) is used as the simulation tool. The simulation results are validated with experimental results. The experiments were conducted in an open Venturi channel with water at atmospheric condition. The inlet water flow rate was 400 kg/min. The flow depth was measured by using ultrasonic level sensors. Both experiment and simulation were done for the channel inclination angles 0 , À0.7 , and À1.5. The agreement between computed and experimental results is satisfactory. At horizontal condition, flow in the channel is supercritical until contraction and subcritical after the contraction. There is a hydraulic jump separating the supercritical and subcritical flow. The position of the hydraulic jump oscillates within a region of about 100 mm. Hydraulic jumps coming from the contraction walls to the upstream flow are the main reasons for the conversion of supercritical flow into subcritical flow. An ''oblique jump'' can be seen where there is a supercritical flow in the contraction. There is a triple point in this oblique jump: the triple point consists of two hydraulic jumps coming from the contraction walls and the resultant wave. The highest flow depth and the lowest velocity in the triple point are found at the oblique jump.

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Volume of Fluid Model of Open Channel Contraction

Cited by 2 publications

References 13 publications

Flow Transition Due to Width Contraction

Flow Transition Due to Width Contraction

Flow regime changes at hydraulic jumps in an open Venturi channel for Newtonian fluid

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