Numerical Model for the Hydraulic Performance of Perforated Pipe Underdrains Surrounded by Loose Aggregate

Afrin, Tanjina; Khan, A. A.; Kaye, Nigel B.; Testik, Firat Yener

doi:10.1061/(asce)hy.1943-7900.0001134

Cited by 22 publications

(10 citation statements)

References 18 publications

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“…A water jet plunging into a pool is a two-phase air-water transient flow problem. e parallel, pressure-based commercial software ANSYS FLUENT (version 18.0), which has wide application in hydraulic engineering computations [25,26], was employed as the solver of the Navier-Stokes equations in this study. e continuity equation and the momentum equation are as follows:…”

Section: Mathematical Description and Numerical Modellingmentioning

confidence: 99%

Numerical Simulations of Air Cavities in Inclined Plunging Jets

Sun

Yuan²,

Jiang

et al. 2020

Mathematical Problems in Engineering

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The dynamic process of circular water jets plunging into a quiescent pool was analyzed in this study based on the RNG k∼ε turbulence model and VOF method. The effects of jet velocity and inclination angles relative to horizontal on the cavity shapes and sizes were analyzed. The simulation successfully captured the formation, development, pinch-off, and disintegration phenomena of cavities. The shape of the cavity is mainly affected by the impact angle, while the impact velocity mainly affects the size of the cavity. The cavity pinch-off initially appears at a certain point in any direction for vertical jets, while the cavity in the opposite direction of flow pinch-off appears before the cavity in the direction of flow for inclined jets. Before cavity pinch-off, the maximum radial and axial sizes of the cavity generally increase with the impact velocity and the time after impingement. The axial penetration velocity of the cavity tip is approximately half of the impact velocity, which is consistent with previous research. Finally, based on the statistics of the cavity sizes, empirical formulas for predicting the maximum radial and axial sizes of the cavity were established.

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Section: Mathematical Description and Numerical Modellingmentioning

confidence: 99%

Numerical Simulations of Air Cavities in Inclined Plunging Jets

Sun

Yuan²,

Jiang

et al. 2020

Mathematical Problems in Engineering

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“…Afrin et al [23] and Gaj and Madramootoo [24,25] established three-dimensional numerical models to simulate the effect of perforation shape, size, and configuration on drainage flow. However, the effect of perforations on the performance of corrugated drains wrapped with geotextile envelope has not been studied.…”

Section: Introduction mentioning

confidence: 99%

Effects of geotextile envelope and perforations on the performance of corrugated drain pipes

Yang

Guo

et al. 2023

International Journal of Agricultural and Biological Engineering

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Subsurface drainage is an important agriculture drainage measure. It is primary to select suitable drain pipes and envelopes for efficient subsurface drainage. And now, corrugated drains and geotextile envelopes are widely used. However, the effects of geotextile envelopes and perforations on the drainage of corrugated drains are not well understood. This study conducted a series of sand tank experiments of steady-state flow with or without geotextile envelopes and with different perforation patterns. The drainage flow and the profile head distributions were analyzed and compared. Furthermore, the applicability of theoretical formulas, which are used to calculate effective radius considering the resistance of different perforation patterns, was evaluated. Results showed that the geotextile envelope weakened the effect of perforations on streamlines, thereby causing the value of effective radiuses to be close to that of the actual radius. The drainage flow of the drain with a geotextile envelope was six times that of the bare drain. The relationship between drainage flow and opening area could be described by inverse proportional function. Meanwhile, the drainage flow was affected by the perforation arrangement. Drain with small longitudinal perforation spacing had a drainage flow of approximately 15% larger than that with wider longitudinal perforation spacing. The bottom perforations drained out first and most, and the drainage flow of the drain opened at the bottom could be 11% higher than that at the top. Low-efficiency perforations cause higher head loss near the pipe wall. Existing formulas of entrance resistance were not suitable for geotextile-wrapped corrugated drains, the effect of geotextile envelope and orifice entrance loss at perforations should be considered.

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“…Clogging analyses for similar systems are scarce. The hydraulic performance of similar systems has been investigated [11,12], but not the effects and characteristics of the clogging of an inflow distribution pipe as far as the authors could find. From the related field of drip irrigation, past studies have indicated that clogging is possible in similar systems [13], but the differences in pipe specifications and sources of water preclude a direct comparison.…”

Section: Introductionmentioning

confidence: 99%

Clogging Impacts on Distribution Pipe Delivery of Street Runoff to an Infiltration Bed

Traver

2018

Water

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The performance of flow through orifices on a perforated distribution pipe between periods with and without partial clogging (submersion of part of the distribution pipe) was compared. The distribution pipe receives runoff and delivers it to an underground infiltration bed. Clogging appeared in winter but was reduced in summer. Performance of flow delivery was found to be defined by the effective pipe length and the pressure head. ANCOVA (ANalysis of COVAriance) was used to examine the clogging effect with flow rate plotted against the effective pipe length times the square root of the mean pressure head, and found that it was significant during low or no rainfall. During larger storms, clogging had little effect on pipe performance. Clogging might be caused by leaves and other trash accumulating in the lower section of the pipe in winter and its effect was insignificant when the water level rose in the pipe, utilizing significantly more orifices on the distribution pipe. Larger storms might also move the debris, thus exposing the orifices. The current maintenance schedule was sufficient to keep the distribution pipe at a satisfactory performance even though partial clogging can exist.

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Numerical Model for the Hydraulic Performance of Perforated Pipe Underdrains Surrounded by Loose Aggregate

Cited by 22 publications

References 18 publications

Numerical Simulations of Air Cavities in Inclined Plunging Jets

Numerical Simulations of Air Cavities in Inclined Plunging Jets

Effects of geotextile envelope and perforations on the performance of corrugated drain pipes

Clogging Impacts on Distribution Pipe Delivery of Street Runoff to an Infiltration Bed

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