Submerged vanes turbulence : experimental analysis
Experimental study was conducted to analyze the physical flow turbulence and sediment distribution with submerged vane. The objectives behind the investigation were verified and compare results with the Odgaard theory, also; achieved to measure vertical pressures acting on both sides of submerged va...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/96104 |
| Acceso en línea: | https://hdl.handle.net/2117/96104 https://dx.doi.org/10.5821/dissertation-2117-96104 |
| Access Level: | acceso abierto |
| Palabra clave: | Hidrodinàmica Sediments fluvials Àrees temàtiques de la UPC::Enginyeria civil |
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Submerged vanes turbulence : experimental analysis |
| title |
Submerged vanes turbulence : experimental analysis |
| spellingShingle |
Submerged vanes turbulence : experimental analysis Hamad Mohamed, Khaled M. A. Hidrodinàmica Sediments fluvials Àrees temàtiques de la UPC::Enginyeria civil |
| title_short |
Submerged vanes turbulence : experimental analysis |
| title_full |
Submerged vanes turbulence : experimental analysis |
| title_fullStr |
Submerged vanes turbulence : experimental analysis |
| title_full_unstemmed |
Submerged vanes turbulence : experimental analysis |
| title_sort |
Submerged vanes turbulence : experimental analysis |
| dc.creator.none.fl_str_mv |
Hamad Mohamed, Khaled M. A. |
| author |
Hamad Mohamed, Khaled M. A. |
| author_facet |
Hamad Mohamed, Khaled M. A. |
| author_role |
author |
| dc.contributor.none.fl_str_mv |
Bateman Pinzón, Allen |
| dc.subject.none.fl_str_mv |
Hidrodinàmica Sediments fluvials Àrees temàtiques de la UPC::Enginyeria civil |
| topic |
Hidrodinàmica Sediments fluvials Àrees temàtiques de la UPC::Enginyeria civil |
| description |
Experimental study was conducted to analyze the physical flow turbulence and sediment distribution with submerged vane. The objectives behind the investigation were verified and compare results with the Odgaard theory, also; achieved to measure vertical pressures acting on both sides of submerged vane, calculate lift and drag forces, lift and drag coefficients experimentally, that the theory of Odgaard was fails to predict satisfactorily. Other motivation of the study was investigates experimentally the hydrodynamic characterization of submerged vanes as; velocities fields, circulation, vorticity, bed topography, pressures, drag and lift forces with its coefficients, study physical fluid turbulence of submerged vanes as; Reynolds normal and shear stresses, turbulent kinetic energy and rate of dissipation, turbulence intensities, Kolmogorov scales, kinetic energy spectrum, turbulent velocities fields, fluctuating velocities and finally Reynolds stresses histograms. Tests were conducted with clear water was transported throughout the re-circulated rectangular channel with cross-section 7.5 m long, 2.52 m wide channel with a bed consisting of 50 cm thick layer of sand with a median diameter of 1.6-mm and a geometric standard deviation of 1.36. Velocities were measured with a 7 Acoustic Doppler Velocimeter ADV, which were calibrated and checked periodically, depths and water surface elevations were measured with a gauge that could be read with an error of less than 0.3 mm. The current meter, gauges were mounted on a movable instrument sliding carriage, which rode on rails a top of the channel walls, on a traversing mechanism, which enabled them to be positioned at any desired location in the channel. Positioning and data sampling were controlled from a computer program. The water surface elevations were used to determine water surface slope S and Darcy-Weisbach friction factor f=8gRS/u_o^2, where uo = undisturbed (pre-vane) cross-sectional-averaged velocity. In all tests, uo=0.2867 m/s, and the discharge Q=116,62 l/s =0.11662 m^3/s. The vanes were made of 14 mm-thick PVC sheet, they were rectangular in shape, with height H = 7 cm = 0.4337d, and length L = 25 cm = 3.571H. In all tests, the vanes were placed at an angle of attack of 20 degrees with the channel centerline. Water depth was 0.1614 m, pre-vane water surface slope, friction factor and geometric standard deviation, sg, were 1.6×10^(-3), 0.045 and 1.36 respectively. The Vectrinos were been calibrated to work at 25Hz and for each position taken data for 4 minutes, a sample volume that is located approximately 4.3 mm of the device. For each position there are seven Vectrinos 10 cm distance from one to other taking data, so data recorded 7 points at the same time. Data recorded were taking on about 24.080 points on whole the sectional cross channel, with the aim to measure the velocities once the channel-bed has reached to the permanent regime or steady state (equilibrium), during the measurements of velocities, we has taken the bed topography (bathymetry) of the channel-bed by using ADV. In the current dissertation, we installed 30 piezometers in each side of Vane. Once obtained the experimental pressures measured at the laboratory on both sides of vane, the pressure difference between vane sides (¿P), and the perpendicular resultant force (FR¿) acting on the vane, first calculated the resultant force between drag and lift components (FR), then we used this force to calculate drag force FD and lift force FL, also calculated Drag coefficient CD, and finally we calculated the Lift coefficient CL. Results, includes submerged vanes turbulence statistics as; Probability distribution of the velocity field, Reynolds stresses, Turbulence intensity, Kinetic and Dissipation energy, and finally, Kolmogorov turbulence scales. Other results contain energy spectrum, turbulent velocities fields, fluctuating velocities and Reynolds stresses histograms. |
| publishDate |
2015 |
| dc.date.none.fl_str_mv |
2015 2015-12-14 2016 2016-11-09 |
| dc.type.none.fl_str_mv |
doctoral thesis http://purl.org/coar/resource_type/c_db06 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
| format |
doctoralThesis |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/96104 https://dx.doi.org/10.5821/dissertation-2117-96104 |
| url |
https://hdl.handle.net/2117/96104 https://dx.doi.org/10.5821/dissertation-2117-96104 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 http://creativecommons.org/licenses/by-nc-sa/3.0/es/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 http://creativecommons.org/licenses/by-nc-sa/3.0/es/ |
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openAccess |
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application/pdf application/pdf application/pdf application/pdf |
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Universitat Politècnica de Catalunya |
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Universitat Politècnica de Catalunya |
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reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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UPCommons. Portal del coneixement obert de la UPC |
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Submerged vanes turbulence : experimental analysisHamad Mohamed, Khaled M. A.HidrodinàmicaSediments fluvialsÀrees temàtiques de la UPC::Enginyeria civilExperimental study was conducted to analyze the physical flow turbulence and sediment distribution with submerged vane. The objectives behind the investigation were verified and compare results with the Odgaard theory, also; achieved to measure vertical pressures acting on both sides of submerged vane, calculate lift and drag forces, lift and drag coefficients experimentally, that the theory of Odgaard was fails to predict satisfactorily. Other motivation of the study was investigates experimentally the hydrodynamic characterization of submerged vanes as; velocities fields, circulation, vorticity, bed topography, pressures, drag and lift forces with its coefficients, study physical fluid turbulence of submerged vanes as; Reynolds normal and shear stresses, turbulent kinetic energy and rate of dissipation, turbulence intensities, Kolmogorov scales, kinetic energy spectrum, turbulent velocities fields, fluctuating velocities and finally Reynolds stresses histograms. Tests were conducted with clear water was transported throughout the re-circulated rectangular channel with cross-section 7.5 m long, 2.52 m wide channel with a bed consisting of 50 cm thick layer of sand with a median diameter of 1.6-mm and a geometric standard deviation of 1.36. Velocities were measured with a 7 Acoustic Doppler Velocimeter ADV, which were calibrated and checked periodically, depths and water surface elevations were measured with a gauge that could be read with an error of less than 0.3 mm. The current meter, gauges were mounted on a movable instrument sliding carriage, which rode on rails a top of the channel walls, on a traversing mechanism, which enabled them to be positioned at any desired location in the channel. Positioning and data sampling were controlled from a computer program. The water surface elevations were used to determine water surface slope S and Darcy-Weisbach friction factor f=8gRS/u_o^2, where uo = undisturbed (pre-vane) cross-sectional-averaged velocity. In all tests, uo=0.2867 m/s, and the discharge Q=116,62 l/s =0.11662 m^3/s. The vanes were made of 14 mm-thick PVC sheet, they were rectangular in shape, with height H = 7 cm = 0.4337d, and length L = 25 cm = 3.571H. In all tests, the vanes were placed at an angle of attack of 20 degrees with the channel centerline. Water depth was 0.1614 m, pre-vane water surface slope, friction factor and geometric standard deviation, sg, were 1.6×10^(-3), 0.045 and 1.36 respectively. The Vectrinos were been calibrated to work at 25Hz and for each position taken data for 4 minutes, a sample volume that is located approximately 4.3 mm of the device. For each position there are seven Vectrinos 10 cm distance from one to other taking data, so data recorded 7 points at the same time. Data recorded were taking on about 24.080 points on whole the sectional cross channel, with the aim to measure the velocities once the channel-bed has reached to the permanent regime or steady state (equilibrium), during the measurements of velocities, we has taken the bed topography (bathymetry) of the channel-bed by using ADV. In the current dissertation, we installed 30 piezometers in each side of Vane. Once obtained the experimental pressures measured at the laboratory on both sides of vane, the pressure difference between vane sides (¿P), and the perpendicular resultant force (FR¿) acting on the vane, first calculated the resultant force between drag and lift components (FR), then we used this force to calculate drag force FD and lift force FL, also calculated Drag coefficient CD, and finally we calculated the Lift coefficient CL. Results, includes submerged vanes turbulence statistics as; Probability distribution of the velocity field, Reynolds stresses, Turbulence intensity, Kinetic and Dissipation energy, and finally, Kolmogorov turbulence scales. Other results contain energy spectrum, turbulent velocities fields, fluctuating velocities and Reynolds stresses histograms.El estudio experimental se ha llevado a cabo para analizar el funcionamiento, la turbulencia del flujo y el transporte de sedimentos con paneles sumergidos. Los objetivos tras la investigación fueron verificados y comparados con los resultados de la teoría de Odgaard, también; se han medido las presiones verticales que actúan sobre ambos lados de los paneles sumergidos, se han calculado las fuerzas de drag y lift y, sus coeficientes experimentalmente, ya que la teoría de Odgaard no pudo predecirlas satisfactoriamente. Otra motivación del estudio, fue investigar experimentalmente la caracterización hidrodinámica de los paneles sumergidos como; distribución de velocidades, circulación, vorticidad, topografía del fondo, presiones, fuerzas de drag y lift y sus coeficientes, tensiones de Reynolds, energía cinética turbulenta y disipación turbulenta, intensidades de turbulencia, escalas de Kolmogorov, espectro de energía cinética, campos de velocidades turbulentas, velocidades fluctuantes y finalmente, histogramas de las tensiones de Reynolds. Se realizaron pruebas en aguas claras, a lo largo de un canal rectangular con una sección de 7.5 m de largo, 2.52 m de ancho y un espesor de 50 cm de arena de 1.6 mm de diámetro medio y una desviación geométrica de 1.36. Las velocidades fueron medidas con 7 Acoustic Doppler velocímeter ADV, las que fueron calibradas y revisadas periódicamente, las profundidades y las alturas de superficie de agua fueron medidas con un limnímetro que puede leerse con un error de menos de 0.3 mm. Los paneles fueron construidos con placas de PVC de 14 mm de espesor, de forma rectangular, con altura H = 7 cm = 0.4337d y longitud L = 25 cm = 3.571H. En todos los ensayos, los paneles se colocaron con un ángulo de ataque al flujo de 20 grados con la línea central del canal. El calado del agua es de 0.1614 m, la pendiente superficie, el factor de fricción y la desviación geométrica, fueron, 0.045 y 1.36 respectivamente. Los Vectrinos se han calibrado para trabajar a 25Hz y con un volumen de control de 4.3 mm, para cada posición se tomaron datos durante 4 minutos. Para cada posición hay siete Vectrinos con una distancia de 10 cm entre ellos, registrando por lo tanto 7 puntos al mismo tiempo. Los datos registrados fueron alrededor de 24,080 puntos en toda la sección del canal, con el objetivo de medir las velocidades una vez los sedimentos en el canal han alcanzado el régimen permanente o estacionario (equilibrio), durante las mediciones de las velocidades, se ha medido la topografía del fondo (batimetría) mediante el uso de los sensores ADV. La tesis actual, ha desarrollado un sistema para medir la presión vertical que actúa sobre ambas caras del panel, se instalaron 30 piezómetros de plástico en cada lado del panel. Una vez obtenida la presión experimental medida en el laboratorio a ambos lados del panel, se halla la diferencia de presión entre los dos lados, y la fuerza perpendicular resultante actuando sobre el panel, primero se calculó la fuerza resultante entre los dos componentes de drag y lift, para utilizarla después en el cálculo de la fuerza del drag FD y lift FL, así como el coeficiente de arrastre CD, y finalmente se calculó el coeficiente de lift CL. Los resultados de turbulencia incluyen; Distribución de probabilidad de la distribución de velocidades, tensiones de Reynolds, intensidad turbulenta, energía cinética y disipación. Finalmente, escalas de turbulencia de Kolmogorov. Otros resultados contienen el espectro de energía, campos de velocidades turbulentas, velocidades fluctuantes y los histogramas de las tensiones de Reynolds.Universitat Politècnica de CatalunyaBateman Pinzón, Allen20152015-12-1420162016-11-09doctoral thesishttp://purl.org/coar/resource_type/c_db06VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttps://hdl.handle.net/2117/96104https://dx.doi.org/10.5821/dissertation-2117-96104reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2http://creativecommons.org/licenses/by-nc-sa/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/961042026-05-27T15:37:01Z |
| score |
15,300719 |