Numerical simulations of water surface profiles and vortex structure in a vortex settling basin by using flow-3D

Tsung Hsien Huang, Chyan-Deng Jan, Yu Chao Hsu

Research output: Contribution to journalArticle

Abstract

A vortex settling basin (VSB), consisting of a cylindrical chamber, an inflow system, a bottom orifice outflow and an overflow weir, has been used to separate sediment from sediment-laden water flow. The efficiency of sediment extraction by a VSB is significantly dependent on the flow characteristics of the device. The vortex in a VSB is complex and it is very difficult if not impossible to measure it by using a direct measurement. The VSB used in this study has a cylinder of 100 cm in diameter and 30 cm in height, with an overflow weir 15 cm height above the bottom. This study numerically assessed the velocity distribution in the VSB by using FLOW-3D. Comparison of the water surface profiles obtained from experiments and simulations shows that the simulated results are quite close to the experimental results, and this indicates that FLOW-3D is a suitable software for simulating flow field in a VSB. The comparisons between inflow depth and outflow discharges indicate there is less than 3.46% error between the numerical output and experimental data. Simulated velocity distributions at the depths of 6.3 cm (the distance from the bottom), 10.3 cm, and 14.3 cm (near the surface layer) were analyzed, respectively. The characteristics of velocity components (tangential, radial, and axial velocities) at these three depths were considered, in addition to the velocity distributions, the formation of an air core in the central part of vortex flow was also simulated and considered. Both the experimental and numerical results show the existence of air core oscillation. The oscillation may cause some changes in the flow field, especially in the high velocity zone, but the overall change in the whole flow field is not obvious.

Original languageEnglish
Pages (from-to)531-542
Number of pages12
JournalJournal of Marine Science and Technology (Taiwan)
Volume25
Issue number5
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Settling tanks
vortex
Vortex flow
surface water
Computer simulation
basin
simulation
Water
flow field
Velocity distribution
weir
Flow fields
Sediments
inflow
outflow
oscillation
sediment
vortex flow
air
Orifices

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Ocean Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{a24fca2da455442483d804df4cb0dcf1,
title = "Numerical simulations of water surface profiles and vortex structure in a vortex settling basin by using flow-3D",
abstract = "A vortex settling basin (VSB), consisting of a cylindrical chamber, an inflow system, a bottom orifice outflow and an overflow weir, has been used to separate sediment from sediment-laden water flow. The efficiency of sediment extraction by a VSB is significantly dependent on the flow characteristics of the device. The vortex in a VSB is complex and it is very difficult if not impossible to measure it by using a direct measurement. The VSB used in this study has a cylinder of 100 cm in diameter and 30 cm in height, with an overflow weir 15 cm height above the bottom. This study numerically assessed the velocity distribution in the VSB by using FLOW-3D. Comparison of the water surface profiles obtained from experiments and simulations shows that the simulated results are quite close to the experimental results, and this indicates that FLOW-3D is a suitable software for simulating flow field in a VSB. The comparisons between inflow depth and outflow discharges indicate there is less than 3.46{\%} error between the numerical output and experimental data. Simulated velocity distributions at the depths of 6.3 cm (the distance from the bottom), 10.3 cm, and 14.3 cm (near the surface layer) were analyzed, respectively. The characteristics of velocity components (tangential, radial, and axial velocities) at these three depths were considered, in addition to the velocity distributions, the formation of an air core in the central part of vortex flow was also simulated and considered. Both the experimental and numerical results show the existence of air core oscillation. The oscillation may cause some changes in the flow field, especially in the high velocity zone, but the overall change in the whole flow field is not obvious.",
author = "Huang, {Tsung Hsien} and Chyan-Deng Jan and Hsu, {Yu Chao}",
year = "2017",
month = "1",
day = "1",
doi = "10.6119/JMST-017-0509-1",
language = "English",
volume = "25",
pages = "531--542",
journal = "Journal of Marine Science and Technology",
issn = "1023-2796",
publisher = "National Taiwan Ocean University",
number = "5",

}

Numerical simulations of water surface profiles and vortex structure in a vortex settling basin by using flow-3D. / Huang, Tsung Hsien; Jan, Chyan-Deng; Hsu, Yu Chao.

In: Journal of Marine Science and Technology (Taiwan), Vol. 25, No. 5, 01.01.2017, p. 531-542.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Numerical simulations of water surface profiles and vortex structure in a vortex settling basin by using flow-3D

AU - Huang, Tsung Hsien

AU - Jan, Chyan-Deng

AU - Hsu, Yu Chao

PY - 2017/1/1

Y1 - 2017/1/1

N2 - A vortex settling basin (VSB), consisting of a cylindrical chamber, an inflow system, a bottom orifice outflow and an overflow weir, has been used to separate sediment from sediment-laden water flow. The efficiency of sediment extraction by a VSB is significantly dependent on the flow characteristics of the device. The vortex in a VSB is complex and it is very difficult if not impossible to measure it by using a direct measurement. The VSB used in this study has a cylinder of 100 cm in diameter and 30 cm in height, with an overflow weir 15 cm height above the bottom. This study numerically assessed the velocity distribution in the VSB by using FLOW-3D. Comparison of the water surface profiles obtained from experiments and simulations shows that the simulated results are quite close to the experimental results, and this indicates that FLOW-3D is a suitable software for simulating flow field in a VSB. The comparisons between inflow depth and outflow discharges indicate there is less than 3.46% error between the numerical output and experimental data. Simulated velocity distributions at the depths of 6.3 cm (the distance from the bottom), 10.3 cm, and 14.3 cm (near the surface layer) were analyzed, respectively. The characteristics of velocity components (tangential, radial, and axial velocities) at these three depths were considered, in addition to the velocity distributions, the formation of an air core in the central part of vortex flow was also simulated and considered. Both the experimental and numerical results show the existence of air core oscillation. The oscillation may cause some changes in the flow field, especially in the high velocity zone, but the overall change in the whole flow field is not obvious.

AB - A vortex settling basin (VSB), consisting of a cylindrical chamber, an inflow system, a bottom orifice outflow and an overflow weir, has been used to separate sediment from sediment-laden water flow. The efficiency of sediment extraction by a VSB is significantly dependent on the flow characteristics of the device. The vortex in a VSB is complex and it is very difficult if not impossible to measure it by using a direct measurement. The VSB used in this study has a cylinder of 100 cm in diameter and 30 cm in height, with an overflow weir 15 cm height above the bottom. This study numerically assessed the velocity distribution in the VSB by using FLOW-3D. Comparison of the water surface profiles obtained from experiments and simulations shows that the simulated results are quite close to the experimental results, and this indicates that FLOW-3D is a suitable software for simulating flow field in a VSB. The comparisons between inflow depth and outflow discharges indicate there is less than 3.46% error between the numerical output and experimental data. Simulated velocity distributions at the depths of 6.3 cm (the distance from the bottom), 10.3 cm, and 14.3 cm (near the surface layer) were analyzed, respectively. The characteristics of velocity components (tangential, radial, and axial velocities) at these three depths were considered, in addition to the velocity distributions, the formation of an air core in the central part of vortex flow was also simulated and considered. Both the experimental and numerical results show the existence of air core oscillation. The oscillation may cause some changes in the flow field, especially in the high velocity zone, but the overall change in the whole flow field is not obvious.

UR - http://www.scopus.com/inward/record.url?scp=85033795950&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85033795950&partnerID=8YFLogxK

U2 - 10.6119/JMST-017-0509-1

DO - 10.6119/JMST-017-0509-1

M3 - Article

AN - SCOPUS:85033795950

VL - 25

SP - 531

EP - 542

JO - Journal of Marine Science and Technology

JF - Journal of Marine Science and Technology

SN - 1023-2796

IS - 5

ER -