subject:(Wall jet)

University of Arizona

1. Stoner, Ryan Michael. Study of Swirling Jets on an Impingement Surface .

Degree: 2020, University of Arizona

► There has been extensive research performed on the turbulent jet stream flow including unimpeded and impinged flow. Vortex jet streams however has not been studied… (more)

▼ There has been extensive research performed on the turbulent jet stream flow including unimpeded and impinged flow. Vortex jet streams however has not been studied in as great of detail. Some researchers have focused on the development of vortex flow as well as axial and azimuthal velocity profiles generated from these jet streams. The need for better control over aircraft carries and decrease the wait time between landing aircraft at airports has driven a need for further research into these vortex flows. If an impingement surface is introduced into these example environments at which angle should it be positioned to quickly dissipate the flow? This research will validate a blower jet stream system, develop vortex nozzles, validate the tripped nozzle and characterize the vortex flow on an impingement surface. To start, an existing converging/diverging blower motor system was utilized for all the experiments performed. A tripped nozzle configuration was used to confirm that the results generated matched those of pervious experiment published. This confirmed not only the physical setup but also the data acquisition methods. Next varying nozzle configuration were designed, printed and tested to determine their functionality. The results confirmed that the nozzles generated increasing levels of vortex flow ranging from low, medium and high azimuthal axis components. After all the nozzles were characterized in the unimpeded configuration the impingement wall was introduced. The tripped nozzle was used as a baseline for this setup since the results for this configuration are well defined. Next each of the vortex nozzles went through the same series of tests. This involved varying speeds of the jet flow as well as three different impingement wall angles. The results showed that at low swirl numbers the jet stream profile match the tripped nozzle setup closely. As the swirl number increase the flow became harder to dissipate. This resulted in the wall needing to be positioned at a steeper angle. Another interesting observation was at the higher vortex flows there was as axial vortex generated that was not seen in any of the other setups. Overall, it was determine that vortex flow required a near vertical wall to effectively impede the flow. Advisors/Committee Members: Shkarayev, Sergey V (advisor), Zohar, Yitshak (committeemember), Thanga, Jekan (committeemember).

Subjects/Keywords: Flow Interaction; Swirling Jet Stream; Wall Impingement

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APA (6^th Edition):

Stoner, R. M. (2020). Study of Swirling Jets on an Impingement Surface . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/641704

Chicago Manual of Style (16^th Edition):

Stoner, Ryan Michael. “Study of Swirling Jets on an Impingement Surface .” 2020. Masters Thesis, University of Arizona. Accessed January 24, 2021. http://hdl.handle.net/10150/641704.

MLA Handbook (7^th Edition):

Stoner, Ryan Michael. “Study of Swirling Jets on an Impingement Surface .” 2020. Web. 24 Jan 2021.

Vancouver:

Stoner RM. Study of Swirling Jets on an Impingement Surface . [Internet] [Masters thesis]. University of Arizona; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10150/641704.

Council of Science Editors:

Stoner RM. Study of Swirling Jets on an Impingement Surface . [Masters Thesis]. University of Arizona; 2020. Available from: http://hdl.handle.net/10150/641704

Virginia Tech

2. Alexander, William Nathan. Sound from Rough Wall Boundary Layers.

Degree: PhD, Aerospace and Ocean Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/29246

► Turbulent flow over a rough surface produces sound that radiates outside the near wall region. This noise source is often at a lower level than… (more)

▼ Turbulent flow over a rough surface produces sound that radiates outside the near wall region. This noise source is often at a lower level than the noise created by edges and bluff body flows, but for applications with large surface area to perimeter ratios at low Mach number, this noise source can have considerable levels. In the first part of this dissertation, a detailed study is made of the ability of the Glegg & Devenport (2009) scattering theory to predict roughness noise. To this end, comparisons are made with measurements from cuboidal and hemispherical roughness with roughness Reynolds numbers, hu_Ï /Î½, ranging from 24 to 197 and roughness height to boundary layer thickness ratios of 5 to 18. Their theory is shown to work very accurately to predict the noise from surfaces with large roughness Reynolds numbers, but for cases with highly inhomogeneous wall pressure fields, differences grow between estimation and measurement. For these surfaces, the absolute levels were underpredicted but the spectral shape of the measurement was correctly determined indicating that the relationship of the radiated noise with the wavenumber wall pressure spectrum and roughness geometry appears to remain relatively unchanged. In the second part of this dissertation, delay and sum beamforming and least-squares analyses were used to examine roughness noise recorded by a 36-sensor linear microphone array. These methods were employed to estimate the variation of source strengths through short fetches of large hemispherical and cuboidal element roughness. The analyses show that the lead rows of the fetches produced the greatest streamwise and spanwise noise radiation. The least-squares analysis confirmed the presence of streamwise and spanwise aligned dipoles emanating from each roughness element as suggested by the LES of Yang & Wang (2011). The least-squares calculated source strengths show that the streamwise aligned dipole is always stronger than that of the spanwise dipole, but the relative magnitude of the difference varies with frequency. Advisors/Committee Members: Devenport, William J. (committeechair), Glegg, Stewart A. L. (committee member), Simpson, Roger L. (committee member), Schetz, Joseph A. (committee member).

Subjects/Keywords: roughness noise; wall-jet; microphone array

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APA (6^th Edition):

Alexander, W. N. (2011). Sound from Rough Wall Boundary Layers. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29246

Chicago Manual of Style (16^th Edition):

Alexander, William Nathan. “Sound from Rough Wall Boundary Layers.” 2011. Doctoral Dissertation, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/29246.

MLA Handbook (7^th Edition):

Alexander, William Nathan. “Sound from Rough Wall Boundary Layers.” 2011. Web. 24 Jan 2021.

Vancouver:

Alexander WN. Sound from Rough Wall Boundary Layers. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/29246.

Council of Science Editors:

Alexander WN. Sound from Rough Wall Boundary Layers. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/29246

3. Mahmoudi, Mohammad. Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall.

Degree: PhD, Department of Mechanical Engineering, 2015, University of Alberta

URL: https://era.library.ualberta.ca/files/c534fr613

► This study presents experimental investigations showing the mean and fluctuating velocity field of a three dimensional round jet in counter-flow located in the vicinity of… (more)

Subjects/Keywords: Offset Jet; Counter-Flow; Velocity Field; Wall Jet

12 more images…

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APA (6^th Edition):

Mahmoudi, M. (2015). Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c534fr613

Chicago Manual of Style (16^th Edition):

Mahmoudi, Mohammad. “Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall.” 2015. Doctoral Dissertation, University of Alberta. Accessed January 24, 2021. https://era.library.ualberta.ca/files/c534fr613.

MLA Handbook (7^th Edition):

Mahmoudi, Mohammad. “Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall.” 2015. Web. 24 Jan 2021.

Vancouver:

Mahmoudi M. Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall. [Internet] [Doctoral dissertation]. University of Alberta; 2015. [cited 2021 Jan 24]. Available from: https://era.library.ualberta.ca/files/c534fr613.

Council of Science Editors:

Mahmoudi M. Investigation of the Velocity Field of Jets in Counter-Flow in the Vicinity of a Solid Wall. [Doctoral Dissertation]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/c534fr613

Penn State University

4. Lurie, Michael Brian. The Prediction of Unsteady Aerodynamic Loading in High Aspect Ratio Wall Bounded Jets.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/26293

► Stealth aircraft are becoming more and more prevalent in the aircraft industry. One of the features of many stealth aircraft is an integrated engine that… (more)

▼ Stealth aircraft are becoming more and more prevalent in the aircraft industry. One of the features of many stealth aircraft is an integrated engine that is mounted above the aircraft fuselage. The engine nozzle is often rectangular with a high aspect ratio, and exhausts onto a jet deck formed by the aircraft fuselage. This configuration allows the aircraft fuselage to shield the noise and other detectable features caused by the engine from the ground. The Northrop Grumman B2 Bomber is perhaps the most well-known example of this configuration. Additionally, stealth technology combined with unmanned aerial vehicles (UAV's) has led to the Joint Unmanned Combat System project, or J-UCAS. Both of the aircraft in development in this project use a wall-bounded high aspect ratio nozzle for stealth purposes. While these engine configurations provide a low radar profile and reduce the noise levels on the ground, they do introduce additional considerations. Since the engine is mounted above the aircraft, the nozzle jet is wall bounded by the fuselage of the aircraft. This is known as the flight deck. The jet stream exiting the nozzle can travel at supersonic speeds and potentially generates shock or expansion waves that impinge on the surface of the deck. The oscillations of these shockwaves on the deck produce localized unsteady forces acting on the aircraft. In addition, the interaction between the high speed jet stream and the slower ambient air causes a shear layer to form from the trailing edge of the nozzle. Turbulent eddies form and increase in size as they move downstream. The interactions of the shear layer with the flight deck produce additional unsteady forces on the aircraft. This thesis presents a study to predict the forces on a flight deck caused by a high aspect ratio wall bounded nozzle using both experimental methods and numerical simulations. The experiments performed were conducted on two different nozzles with aspect ratios of 4-1 and 8-1. Several different run conditions, including subsonic, over-expanded, on-design, and under-expanded, are included to study the effects of Mach number on the unsteady pressure. An aluminum flat plate is used to represent the aft deck. The plate is instrumented with Endevco pressure transducers to capture the fluctuating pressure on the aft deck. A spectral analysis performed on the individual sensors shows that the primary sources of fluctuating pressure are the shear layer along with shock-boundary layer interaction. Additional scaling with the nozzle heights is also presented. The numerical simulations were performed using a fully viscous, hybrid RANS/LES model. They matched the nozzle characteristics and run conditions performed in the experiment. A detailed comparison between the unsteady pressures predicted by the computational simulations and those measured by the experiment is presented. Several discrepancies between the experimental and numerical results are the result of numerical error caused by the time marching scheme used in the… Advisors/Committee Members: Philip John Morris, Dissertation Advisor/Co-Advisor, Dennis K Mclaughlin, Committee Member, Cengiz Camci, Committee Member, Stephen A Hambric, Special Member.

Subjects/Keywords: Aerospace; Vibrations; CFD; Computational; Acoustics; Experiment; Turbulence; Free Jet; Wall Jet; Nozzle

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APA (6^th Edition):

Lurie, M. B. (2015). The Prediction of Unsteady Aerodynamic Loading in High Aspect Ratio Wall Bounded Jets. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/26293

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lurie, Michael Brian. “The Prediction of Unsteady Aerodynamic Loading in High Aspect Ratio Wall Bounded Jets.” 2015. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/26293.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lurie, Michael Brian. “The Prediction of Unsteady Aerodynamic Loading in High Aspect Ratio Wall Bounded Jets.” 2015. Web. 24 Jan 2021.

Vancouver:

Lurie MB. The Prediction of Unsteady Aerodynamic Loading in High Aspect Ratio Wall Bounded Jets. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/26293.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lurie MB. The Prediction of Unsteady Aerodynamic Loading in High Aspect Ratio Wall Bounded Jets. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/26293

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

5. Geiser, Jayson Spencer. EFFECTS OF WALL PLANE TOPOLOGY ON VORTEX-WALL INTERACTIONS IN A FORCED IMPINGING JET.

Degree: Mechanical Engineering, 2011, University of Maryland

URL: http://hdl.handle.net/1903/12520

► The phenomenon of a three-dimensionally unstable vortex-ground interaction is studied, motivated by the problem of sediment suspension by vortex-wall interactions from landing rotorcraft. In the… (more)

Subjects/Keywords: Mechanical engineering; Aerospace engineering; Brownout; Impinging Jet; rotorcraft; topology; Vortex; Wall jet

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APA (6^th Edition):

Geiser, J. S. (2011). EFFECTS OF WALL PLANE TOPOLOGY ON VORTEX-WALL INTERACTIONS IN A FORCED IMPINGING JET. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/12520

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Geiser, Jayson Spencer. “EFFECTS OF WALL PLANE TOPOLOGY ON VORTEX-WALL INTERACTIONS IN A FORCED IMPINGING JET.” 2011. Thesis, University of Maryland. Accessed January 24, 2021. http://hdl.handle.net/1903/12520.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Geiser, Jayson Spencer. “EFFECTS OF WALL PLANE TOPOLOGY ON VORTEX-WALL INTERACTIONS IN A FORCED IMPINGING JET.” 2011. Web. 24 Jan 2021.

Vancouver:

Geiser JS. EFFECTS OF WALL PLANE TOPOLOGY ON VORTEX-WALL INTERACTIONS IN A FORCED IMPINGING JET. [Internet] [Thesis]. University of Maryland; 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1903/12520.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Geiser JS. EFFECTS OF WALL PLANE TOPOLOGY ON VORTEX-WALL INTERACTIONS IN A FORCED IMPINGING JET. [Thesis]. University of Maryland; 2011. Available from: http://hdl.handle.net/1903/12520

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

6. Van der Steen, M. (author). Flame-wall interaction of a flame jet impinging normally on a cooled cylinder.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599

►

The main objective of the present experimental investigation is to study the turbulent reacting flow field in the region where a stable premixed flame jet… (more)

Subjects/Keywords: combustion; PIV; flame-wall interaction; Reynolds stress; impinging jet

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APA (6^th Edition):

Van der Steen, M. (. (2014). Flame-wall interaction of a flame jet impinging normally on a cooled cylinder. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599

Chicago Manual of Style (16^th Edition):

Van der Steen, M (author). “Flame-wall interaction of a flame jet impinging normally on a cooled cylinder.” 2014. Masters Thesis, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599.

MLA Handbook (7^th Edition):

Van der Steen, M (author). “Flame-wall interaction of a flame jet impinging normally on a cooled cylinder.” 2014. Web. 24 Jan 2021.

Vancouver:

Van der Steen M(. Flame-wall interaction of a flame jet impinging normally on a cooled cylinder. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599.

Council of Science Editors:

Van der Steen M(. Flame-wall interaction of a flame jet impinging normally on a cooled cylinder. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599

7. Le Bras, Sophie. Modélisation de paroi et traitement aux interfaces des maillages non-conformes pour les simulations aéroacoustiques avec une approche numérique d'ordre élevé : Wall modeling and treatment at the interfaces of non-conforming grids for aeroacoustic simulations using a high-order numerical approach.

Degree: Docteur es, Acoustique, 2016, Lyon

URL: http://www.theses.fr/2016LYSEC008

►

Cette thèse est consacrée au développement de méthodes numériques pour la prévision du bruit des jets par la simulation des grandes échelles (LES). L’approche LES… (more)

▼

Cette thèse est consacrée au développement de méthodes numériques pour la prévision du bruit des jets par la simulation des grandes échelles (LES). L’approche LES suivie s’appuie sur l’utilisation de schémas de discrétisation spatiale implicites d’ordre élevé peu dissipatifs et peu dispersifs en volumes finis. Elle permet de calculer directement les sources acoustiques dans les écoulements turbulents et de propager les ondes sonores avec précision. Deux méthodes numériques sont développées en vue de faciliter la réalisation des simulations. La première méthode est la mise en œuvre d’une modélisation de paroi pour s’affranchir des contraintes liées à la résolution des couches limites qui se développent près des parois. Un modèle de paroi analytique est couplé aux schémas d’ordre élevé de discrétisation spatiale. Une discrétisation spatiale particulière, s’appuyant sur la reconstruction de cellules fictives, est proposée près des parois. Sa performance est évaluée en simulant un écoulement turbulent de canal à un nombre de Mach de 0.2 et un nombre de Reynolds de frottement de 2000, puis un écoulement de jet simple subsonique et isotherme à un nombre de Mach de 0.6 et un nombre de Reynolds basé sur le diamètre du jet de 570 000. Les caractéristiques aérodynamiques et acoustiques des écoulements sont comparées avec succès aux résultats des simulations numériques directes et aux mesures expérimentales de la littérature. La seconde méthode porte sur le développement d’un traitement aux interfaces des maillages non conformes. Ces maillages présentent des discontinuités aux interfaces entre les blocs ce qui permet l’utilisation de maillages plus simples pour les calculs. Le traitement proposé assure la compatibilité entre les schémas de discrétisation spatiale et les maillages non conformes, tout en répondant aux exigences de précision imposées par les simulations aéroacoustiques. Ce traitement s’appuie sur la réalisation d’interpolations de type meshless. Sa validité est examinée en simulant la convection d’un tourbillon et le développement d’une couche de mélange en 2-D. Les résultats obtenus montrent que le traitement proposé ne génère pas d’oscillations parasites d’amplitude significative et ne perturbe pas le développement de l’écoulement au voisinage des raccords de bloc.

This thesis is devoted to the development of numerical methods to predict jet noise using Large-Eddy Simulation (LES). The LES approach used in this work relies on high-order low-dissipation and low-dispersion implicit finite-volume schemes for spatial discretization. It allows the direct calculation of acoustic sources in turbulent flows and the propagation of sound waves with accuracy. Two numerical methods are developed in order to facilitate the LES computations. The first method focuses on using wall modeling in the near-wall regions instead of resolving the boundary layers. An analytical wall model is combined with the high-order schemes for spatial discretization. A specific spatial discretization, based on a ghost cell reconstruction, is…

Advisors/Committee Members: Bogey, Christophe (thesis director).

Subjects/Keywords: Bruit des jets; Modélisation de paroi; Jet Noise; Wall modelling

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APA (6^th Edition):

Le Bras, S. (2016). Modélisation de paroi et traitement aux interfaces des maillages non-conformes pour les simulations aéroacoustiques avec une approche numérique d'ordre élevé : Wall modeling and treatment at the interfaces of non-conforming grids for aeroacoustic simulations using a high-order numerical approach. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2016LYSEC008

Chicago Manual of Style (16^th Edition):

Le Bras, Sophie. “Modélisation de paroi et traitement aux interfaces des maillages non-conformes pour les simulations aéroacoustiques avec une approche numérique d'ordre élevé : Wall modeling and treatment at the interfaces of non-conforming grids for aeroacoustic simulations using a high-order numerical approach.” 2016. Doctoral Dissertation, Lyon. Accessed January 24, 2021. http://www.theses.fr/2016LYSEC008.

MLA Handbook (7^th Edition):

Le Bras, Sophie. “Modélisation de paroi et traitement aux interfaces des maillages non-conformes pour les simulations aéroacoustiques avec une approche numérique d'ordre élevé : Wall modeling and treatment at the interfaces of non-conforming grids for aeroacoustic simulations using a high-order numerical approach.” 2016. Web. 24 Jan 2021.

Vancouver:

Le Bras S. Modélisation de paroi et traitement aux interfaces des maillages non-conformes pour les simulations aéroacoustiques avec une approche numérique d'ordre élevé : Wall modeling and treatment at the interfaces of non-conforming grids for aeroacoustic simulations using a high-order numerical approach. [Internet] [Doctoral dissertation]. Lyon; 2016. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2016LYSEC008.

Council of Science Editors:

Le Bras S. Modélisation de paroi et traitement aux interfaces des maillages non-conformes pour les simulations aéroacoustiques avec une approche numérique d'ordre élevé : Wall modeling and treatment at the interfaces of non-conforming grids for aeroacoustic simulations using a high-order numerical approach. [Doctoral Dissertation]. Lyon; 2016. Available from: http://www.theses.fr/2016LYSEC008

University of Windsor

8. Sharma, Sachin. CFD EVALUATION OF COUNTER-FLOWING WALL JET.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 2018, University of Windsor

URL: https://scholar.uwindsor.ca/etd/7425

► Counter-flowing wall jets are used as mixing devices in several industrial engineering applications, for instance; mixing of effluents in rivers, enhancement of the heat transfer… (more)

Subjects/Keywords: CFFJ; CFWJ; IDDES; Penetration length; Wall Jet; Width of recirculation region

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APA (6^th Edition):

Sharma, S. (2018). CFD EVALUATION OF COUNTER-FLOWING WALL JET. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7425

Chicago Manual of Style (16^th Edition):

Sharma, Sachin. “CFD EVALUATION OF COUNTER-FLOWING WALL JET.” 2018. Masters Thesis, University of Windsor. Accessed January 24, 2021. https://scholar.uwindsor.ca/etd/7425.

MLA Handbook (7^th Edition):

Sharma, Sachin. “CFD EVALUATION OF COUNTER-FLOWING WALL JET.” 2018. Web. 24 Jan 2021.

Vancouver:

Sharma S. CFD EVALUATION OF COUNTER-FLOWING WALL JET. [Internet] [Masters thesis]. University of Windsor; 2018. [cited 2021 Jan 24]. Available from: https://scholar.uwindsor.ca/etd/7425.

Council of Science Editors:

Sharma S. CFD EVALUATION OF COUNTER-FLOWING WALL JET. [Masters Thesis]. University of Windsor; 2018. Available from: https://scholar.uwindsor.ca/etd/7425

Virginia Tech

9. Letica, Stefan Josip. Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field.

Degree: MS, Aerospace Engineering, 2020, Virginia Tech

URL: http://hdl.handle.net/10919/99965

► Trailing edge noise is a common noise source in aerodynamic applications, such as wind turbines, duct fan blades, and propellers. As sound is a nuisance… (more)

Subjects/Keywords: trailing edge noise; aeroacoustics; serrations; turbulent boundary layers; wall jet

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APA (6^th Edition):

Letica, S. J. (2020). Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/99965

Chicago Manual of Style (16^th Edition):

Letica, Stefan Josip. “Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field.” 2020. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/99965.

MLA Handbook (7^th Edition):

Letica, Stefan Josip. “Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field.” 2020. Web. 24 Jan 2021.

Vancouver:

Letica SJ. Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field. [Internet] [Masters thesis]. Virginia Tech; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/99965.

Council of Science Editors:

Letica SJ. Understanding the Impact of a Serrated Trailing Edge on the Unsteady Hydrodynamic Field. [Masters Thesis]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/99965

Queens University

10. Banyassady, Rayhaneh. Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces .

Degree: Mechanical and Materials Engineering, 2015, Queens University

URL: http://hdl.handle.net/1974/13076

► Large-eddy simulations were carried out to investigate the flow dynamics of wall jets over smooth and rough surfaces. Results were validated against data in the… (more)

▼ Large-eddy simulations were carried out to investigate the flow dynamics of wall jets over smooth and rough surfaces. Results were validated against data in the literature. A sand-grain roughness model is used, based on an immersed boundary method. To understand the extent to which the outer/inner layer modifies the inner/outer layer and the extent to which the effect of roughness spreads away from the wall, instantaneous and mean flow fields were investigated. For the Reynolds numbers and roughness heights considered in this study, the effect of roughness is mostly confined to the near-wall region in both plane and radial configurations. There is no structural difference between the outer layer over smooth and rough surfaces. Roughness does not affect either the size of the outer-layer structures or the scaling of the profiles of Reynolds stresses in the outer layer. However, in the inner layer, roughness redistributes stresses from streamwise to wall-normal and spanwise directions. Contours of joint probability-density function of the streamwise and wall-normal velocity fluctuations at the bottom of the logarithmic region match those of the turbulent boundary layer at the same height; traces of the outer-layer structures were detected at the top of the logarithmic region, indicating that they do not affect the flow very close to the wall, but still modify a major portion of the inner layer. Simulations of plane and radial wall-jets at several Re numbers were then investigated to, first, compare the plane and radial wall-jets and, second, to quantify the interaction of inner and outer layers. In both cases, the local Reynolds number is an important determining factor in characterization of the flow. The joint probability density function analysis shows that the local Reynolds number determines the level of intrusion of the outer layer into the inner layer. As the local Reynolds number increases, the thickness of the overlap layer becomes smaller, and the inner layer of the wall jet becomes more similar to the conventional turbulent boundary layer, i.e., the extent of the logarithmic region of the wall jets increases and its slope gets closer to the universal law of the wall.

Subjects/Keywords: plane wall-jet ; immersed boundary method ; large-eddy simulation ; inner/outer layer interaction ; roughness ; radial wall-jet ; logarithmic law of the wall

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APA (6^th Edition):

Banyassady, R. (2015). Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13076

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Banyassady, Rayhaneh. “Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces .” 2015. Thesis, Queens University. Accessed January 24, 2021. http://hdl.handle.net/1974/13076.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Banyassady, Rayhaneh. “Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces .” 2015. Web. 24 Jan 2021.

Vancouver:

Banyassady R. Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces . [Internet] [Thesis]. Queens University; 2015. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1974/13076.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Banyassady R. Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces . [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13076

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

11. Alexander, William Nathan. Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum.

Degree: MS, Aerospace and Ocean Engineering, 2009, Virginia Tech

URL: http://hdl.handle.net/10919/33643

► Roughness noise can be a significant contributor of sound in low Mach number, high Reynolds number flows. Only a small amount of experimental research has… (more)

▼ Roughness noise can be a significant contributor of sound in low Mach number, high Reynolds number flows. Only a small amount of experimental research has been conducted to analyze roughness noise because of its often low energy levels that are hard to isolate even in a laboratory setting. This study details efforts to scale the roughness noise while independently varying roughness size and edge velocity. Measurements were taken in the Virginia Tech Anechoic Wall Jet Facility for stochastic rough surfaces varying from hydrodynamically smooth to fully rough as well as deterministic rough surfaces including 1mm and 3mm hemispheres and a 2D wavy wall. Inner and outer variable normalizations were applied to recorded far field data in an attempt to find specific driving variables of the roughness noise. Also, a newly formulated derivation that attempts to scale the far field sound from a single point wall pressure measurement was used to collapse the far field noise. From the results, the inner and outer variable scalings were unable to collapse the noise generated by all velocities and roughness sizes. The changing spectral shapes of noise generated by rough surfaces with significantly varying wavenumber spectra make it impossible to scale the produced noise using the proposed inner and outer variable scalings. They use only one a single scaling value for the entire frequency range of each spectrum. The analyzed wall pressure normalization, which is inherently frequency dependent, produces a tight collapse within the uncertainty of the measurements for all rough surfaces studied except the larger hemispherical roughness which had individual elements that dominated the surrounding region of the wall pressure microphone. This indicates that the roughness generated noise is directly proportional to the wall pressure spectrum. The collapsed data displayed a slope of Ï ², the expected dipole efficiency factor. This is the clearest confirmation to date that the roughness noise source is of a dipole nature. Advisors/Committee Members: Devenport, William J. (committeechair), Glegg, Stewart A. L. (committee member), Simpson, Roger L. (committee member).

Subjects/Keywords: wall jet; rough wall; roughness noise; surface pressure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alexander, W. N. (2009). Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33643

Chicago Manual of Style (16^th Edition):

Alexander, William Nathan. “Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum.” 2009. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/33643.

MLA Handbook (7^th Edition):

Alexander, William Nathan. “Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum.” 2009. Web. 24 Jan 2021.

Vancouver:

Alexander WN. Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum. [Internet] [Masters thesis]. Virginia Tech; 2009. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/33643.

Council of Science Editors:

Alexander WN. Normalization of Roughness Noise on the Near-Field Wall Pressure Spectrum. [Masters Thesis]. Virginia Tech; 2009. Available from: http://hdl.handle.net/10919/33643

University of Saskatchewan

12. Tang, Zhujun. An experimental study of a plane turbulent wall jet on smooth and rough surfaces.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2016-05-2567

► This study presents an experimental investigation of incomplete similarity and the effect of surface roughness on a plane turbulent wall jet on a hydraulically smooth,… (more)

▼ This study presents an experimental investigation of incomplete similarity and the effect of surface roughness on a plane turbulent wall jet on a hydraulically smooth, transitionally rough and fully rough surface based on a new set of particle image velocimetry (PIV) measurements. The focus is on examining the changes in the characteristics of the mean velocity field. Velocity measurements were taken along the centerline of the ground plane with seven fields of view (FOV) covering the entire streamwise extent, i.e. the inflow, developing and fully developed regions. In each FOV, 2,000 and 4,000 pairs of instantaneous PIV raw images were captured at a sampling frequency of 4 Hz for the smooth and rough surface cases, respectively. Four series of measurements were conducted: two series of measurements were taken on the smooth surface at two inlet flow rates corresponding to slot Reynolds numbers of 7,190 and 14,300, respectively; then the rough surface was installed and two series of measurements were taken at the same two inlet flow rates corresponding to slot Reynolds numbers of 6,660 and 13,400, which resulted in a transitionally rough and a fully rough flow condition, respectively. In-house PIV software was used to complete the cross-correlation analysis of the PIV images and the post-correlation rejection of outlier velocity vectors with a dynamic threshold neural network technique to obtain the mean and fluctuating velocity data. The results show that at the inlet boundary, the surface roughness decreases the mass flux near the wall due to the enhanced wall shear stress. In the initial developing region, which covers the first ten slot heights of streamwise distance, the enhanced wall friction associated with the rough surface shortens the potential core. The surface roughness causes the onset of the fully developed region to appear farther downstream on the rough surface than on the smooth surface. For the low flow rate (LFR) case on the rough surface, the roughness shift decreases monotonically with distance from the slot, which indicates that the effect of surface roughness on the mean velocity profile is decreasing. The profile fitting result for the fully rough case suggests that the value of von Karman’s constant κ in the logarithmic law may depend on the surface roughness. In the fully developed region, for the LFR case, the surface roughness enlarges the thicknesses of both the outer and inner layers, though this effect is much more significant for the inner layer than for the outer layer. This is also observed for the high flow rate (HFR) case, but with a much more noticeable effect of surface roughness. The surface roughness increases the spread rate of the inner layer significantly and penetrates into the outer layer, although the impact is much less for the outer layer. For the LFR case, while in general the surface roughness tends to increase the streamwise growth rate of the inner and outer half-widths, the magnitude of this effect becomes stronger as the wall-normal distance to the surface… Advisors/Committee Members: Bergstrom, Donald J., Bugg, James D., Sumner, David, Noble, Scott D., Helgason, Warren.

Subjects/Keywords: plane turbulent wall jet; incomplete similarity; scaling laws; hydrodynamic roughness; particle image velocimetry (PIV).

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APA (6^th Edition):

Tang, Z. (2016). An experimental study of a plane turbulent wall jet on smooth and rough surfaces. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2016-05-2567

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tang, Zhujun. “An experimental study of a plane turbulent wall jet on smooth and rough surfaces.” 2016. Thesis, University of Saskatchewan. Accessed January 24, 2021. http://hdl.handle.net/10388/ETD-2016-05-2567.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tang, Zhujun. “An experimental study of a plane turbulent wall jet on smooth and rough surfaces.” 2016. Web. 24 Jan 2021.

Vancouver:

Tang Z. An experimental study of a plane turbulent wall jet on smooth and rough surfaces. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10388/ETD-2016-05-2567.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tang Z. An experimental study of a plane turbulent wall jet on smooth and rough surfaces. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/ETD-2016-05-2567

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

13. Schroeder, Robert Paul. Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole.

Degree: 2015, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27382

► Gas turbines are heavily used for electricity generation and aircraft propulsion with a strong desire in both uses to maximize thermal efficiency while maintaining reasonable… (more)

▼ Gas turbines are heavily used for electricity generation and aircraft propulsion with a strong desire in both uses to maximize thermal efficiency while maintaining reasonable power output. As a consequence, gas turbines run at high turbine inlet temperatures that require sophisticated cooling technologies to ensure survival of turbine components. One such technology is film cooling with shaped holes, where air is withdrawn from latter stages of the compressor, is bypassed around the combustor, and is eventually ejected out holes in turbine component surfaces. Air ejected from these shaped holes helps maintain components at temperatures lower than flow from the combustor. Many studies have investigated different factors that influence shaped hole performance. However, no studies in open literature have investigated how cooling performance is affected by roughness along interior walls of the shaped hole. The effect of in-hole roughness on shaped hole film cooling was the focus of this research. Investigation of in-hole roughness effects first required the determination of behavior for a shaped hole with smooth walls. A public shaped hole, now used by other investigators as well, was designed with a diffused outlet having 7 degree expansion angles and an area ratio of 2.5. At low freestream turbulence intensity of 0.5%, film cooling adiabatic effectiveness for this smooth hole was found to peak at a blowing ratio of 1.5. Measurements of flowfields and thermal fields revealed causes of this behavior. Blowing ratio increases above 1.5 caused the jet from the smooth hole to penetrate higher into the surrounding mainstream, exhibit a stronger counter-rotating vortex pair, and have narrower contact with the wall than at lower blowing ratios. Experiments performed at high freestream turbulence intensity of 13% revealed dynamics of how freestream turbulence both diluted and laterally spread coolant. At the high blowing ratio of 3 the dilution and spreading were competing effects, such that elevated freestream turbulence did not cause a decrease in area-averaged effectiveness. At the blowing ratio of 1.5, high freestream turbulence caused area-averaged effectiveness to decrease 17% relative to the low freestream turbulence case. Film cooling performance was measured for the shaped hole geometry with several different configurations of in-hole roughness. At low freestream turbulence intensity, in-hole roughness caused decreases in area-averaged adiabatic effectiveness up to 61% relative to the smooth hole performance. These percent decreases in adiabatic effectiveness were more severe with increasing roughness levels and with increasing blowing ratios. Flowfield and thermal field measurements for the configuration with largest roughness size showed that the decrease in adiabatic effectiveness for rough holes as compared to smooth holes was due to thicker boundary layers along the interior walls of the cooling holes. The thicker boundary layers resulted in faster jet core flow, which in turn caused… Advisors/Committee Members: Karen Ann Thole, Dissertation Advisor/Co-Advisor, Karen Ann Thole, Committee Chair/Co-Chair, Savas Yavuzkurt, Committee Member, Stephen P Lynch, Committee Member, Brent Craven, Committee Member, James Heidmann, Special Member.

Subjects/Keywords: film cooling; rough wall; gas turbine heat transfer; detached jet; shaped hole; viscous sublayer

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APA (6^th Edition):

Schroeder, R. P. (2015). Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27382

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schroeder, Robert Paul. “Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole.” 2015. Thesis, Penn State University. Accessed January 24, 2021. https://submit-etda.libraries.psu.edu/catalog/27382.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schroeder, Robert Paul. “Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole.” 2015. Web. 24 Jan 2021.

Vancouver:

Schroeder RP. Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 24]. Available from: https://submit-etda.libraries.psu.edu/catalog/27382.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schroeder RP. Influence of In-Hole Roughness and High Freestream Turbulence on Film Cooling From a Shaped Hole. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27382

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manitoba

14. Adane, Kofi F. K. Experimental and Numerical Investigation of Three-Dimensional Laminar Wall Jet of Newtonian and Non-Newtonian Fluids.

Degree: Mechanical and Manufacturing Engineering, 2010, University of Manitoba

URL: http://hdl.handle.net/1993/3871

► A research program was designed to investigate the characteristics of three-dimensional laminar wall jet flow of both Newtonian and two shear-thinning non-Newtonian fluids. The non-Newtonian… (more)

▼ A research program was designed to investigate the characteristics of three-dimensional laminar wall jet flow of both Newtonian and two shear-thinning non-Newtonian fluids. The non-Newtonian fluids were prepared from xanthan gum solutions of various concentrations. Both experimental and numerical methodologies were employed in this study. The wall jet was created using a circular pipe of diameter 7 mm and flows into an open fluid tank. The initial Reynolds numbers based on the pipe diameter and jet exit velocity ranged from 250 to 800. The velocity measurements were conducted using a particle image velocimetry technique. The measurements were conducted at several streamwise locations to cover both the developing and self-similar regions. For the numerical study, the complete nonlinear Navier-Stokes equation was solved using an in-house colocated finite volume based CFD code. A Carreau model was employed for the non-Newtonian fluids. The viscosity in the governing equations was obtained explicitly. From the PIV measurements and CFD results, velocity profiles and jet half-widths were extracted at selected downstream locations to study the effects of Reynolds number and specific fluid type on the jet characteristics. It was observed that the numerical results are in reasonable agreement with the experimental data. The decay of maximum velocity, jet spread rates, skin friction coefficient, streamwise velocity profiles, and secondary flows depend strongly on the initial Reynolds number irrespective of the fluid. The results also show that the jet spreads more in the spanwise direction than in the transverse direction in the early flow development whereas the reverse is true in the downstream region. Important differences were observed when the results for the non-Newtonian fluids were compared with those for Newtonian fluid. Advisors/Committee Members: Tachie, Mark (Mechanical and Manufacturing Engineering) (supervisor), Ormiston, Scott (Mechanical and Manufacturing Engineering).

Subjects/Keywords: Wall-Jet; Laminar; CFD; Non-Newtonian; Shear-thinning; Fluids; Experimental; Numerical; PIV; Water; Three-dimensional

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APA (6^th Edition):

Adane, K. F. K. (2010). Experimental and Numerical Investigation of Three-Dimensional Laminar Wall Jet of Newtonian and Non-Newtonian Fluids. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/3871

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Adane, Kofi F K. “Experimental and Numerical Investigation of Three-Dimensional Laminar Wall Jet of Newtonian and Non-Newtonian Fluids.” 2010. Thesis, University of Manitoba. Accessed January 24, 2021. http://hdl.handle.net/1993/3871.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Adane, Kofi F K. “Experimental and Numerical Investigation of Three-Dimensional Laminar Wall Jet of Newtonian and Non-Newtonian Fluids.” 2010. Web. 24 Jan 2021.

Vancouver:

Adane KFK. Experimental and Numerical Investigation of Three-Dimensional Laminar Wall Jet of Newtonian and Non-Newtonian Fluids. [Internet] [Thesis]. University of Manitoba; 2010. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1993/3871.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Adane KFK. Experimental and Numerical Investigation of Three-Dimensional Laminar Wall Jet of Newtonian and Non-Newtonian Fluids. [Thesis]. University of Manitoba; 2010. Available from: http://hdl.handle.net/1993/3871

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

15. Robertson Welsh, Bradley. On the influence of nozzle geometries on supersonic curved wall jets.

Degree: PhD, 2017, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/on-the-influence-of-nozzle-geometries-on-supersonic-curved-wall-jets(bc8817e4-c812-44bc-8dfb-f5d0fdf62a72).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728007

► Circulation control involves tangentially blowing air around a rounded trailing edge in order to augment the lift of a wing. The advantages of this technique… (more)

▼ Circulation control involves tangentially blowing air around a rounded trailing edge in order to augment the lift of a wing. The advantages of this technique over conventional mechanical controls are reduced maintenance and lower observability. Despite the technology first being proposed in the 1960s and well-studied since, circulation control is not in widespread use today. This is largely due to the high mass flow requirements. Increasing the jet velocity increases both the efficiency (in terms of mass flow) and effectiveness. However, as the jet velocity exceeds the speed of sound, shock structures form which cause the jet to separate. Recent developments in the field of fluidic thrust vectoring (FTV) have shown that an asymmetrical convergent-divergent nozzle capable of producing an irrotational vortex (IV) has the potential to prevent separation through eliminating stream-wise pressure gradients. In this study, the feasibility of preventing separation at arbitrarily high jet velocities through the use of asymmetrical nozzle geometries designed to maintain irrotational (and stream-wise pressure gradient free) flow is explored. Furthermore, the usefulness of an adaptive nozzle geometry for the purpose of extending circulation control device efficiency and effectiveness is defined. Through a series of experiments, the flow physics of supersonic curved wall jets is characterised across a range of nozzle geometries. IV and equivalent area ratio symmetrical convergent-divergent nozzles are compared across three slot height to radius ratios (H/R): H/R = 0.1, H/R = 0.15, H/R = 0.2. The conclusion of this study is that at low H/R (0.1 and 0.15), there is no significant difference in behaviour between IV and symmetrical nozzles, whilst at high H/R (0.2), the IV nozzles begin separating whilst correctly expanded due to the propagation of pressure upstream from the edge of the reaction surface via the boundary layer. Consequently, it is shown that symmetrical nozzles of equivalent mass flow at high H/R have a higher separation NPR compared to IV nozzles. Specifically, the elimination of favourable, in addition to adverse stream-wise pressure gradients contradicts the expected behaviour of IV nozzles. The separation NPR for nozzles tested in this study, in addition to past studies is subsequently plotted against the throat height to radius ratios (A*/R). This shows that in fact, no previous experiments have shown a higher separation NPR for IV nozzles compared to symmetrical nozzles of equivalent mass flow. The overall outcome is that neither fixed geometry IV, nor adaptive nozzles are justified to maintain attachment, or to improve efficiency. This is because fixed nozzle geometries designed for higher separation NPR do not show any performance deficit when operating at lower NPRs. However, the throat height could be varied to maximise effectiveness (at the expense of mass flow). The contributions to new knowledge made by this study are as follows: the development of a new method of combining shadowgraph and schlieren…

Subjects/Keywords: 629.134; CC; FTV; fluidic thrust vectoring; irrotational; jet; circulation control; curved; supersonic; shadowgraph; schlieren; wall

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APA (6^th Edition):

Robertson Welsh, B. (2017). On the influence of nozzle geometries on supersonic curved wall jets. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/on-the-influence-of-nozzle-geometries-on-supersonic-curved-wall-jets(bc8817e4-c812-44bc-8dfb-f5d0fdf62a72).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728007

Chicago Manual of Style (16^th Edition):

Robertson Welsh, Bradley. “On the influence of nozzle geometries on supersonic curved wall jets.” 2017. Doctoral Dissertation, University of Manchester. Accessed January 24, 2021. https://www.research.manchester.ac.uk/portal/en/theses/on-the-influence-of-nozzle-geometries-on-supersonic-curved-wall-jets(bc8817e4-c812-44bc-8dfb-f5d0fdf62a72).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728007.

MLA Handbook (7^th Edition):

Robertson Welsh, Bradley. “On the influence of nozzle geometries on supersonic curved wall jets.” 2017. Web. 24 Jan 2021.

Vancouver:

Robertson Welsh B. On the influence of nozzle geometries on supersonic curved wall jets. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Jan 24]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/on-the-influence-of-nozzle-geometries-on-supersonic-curved-wall-jets(bc8817e4-c812-44bc-8dfb-f5d0fdf62a72).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728007.

Council of Science Editors:

Robertson Welsh B. On the influence of nozzle geometries on supersonic curved wall jets. [Doctoral Dissertation]. University of Manchester; 2017. Available from: https://www.research.manchester.ac.uk/portal/en/theses/on-the-influence-of-nozzle-geometries-on-supersonic-curved-wall-jets(bc8817e4-c812-44bc-8dfb-f5d0fdf62a72).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.728007

Delft University of Technology

16. Ismail, U. (author). Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f

►

Report PRE-2628. The Algebraic Structure Based Model (ASBM) of Langer and Reynolds (2003) provides an innovative approach for modeling the turbulent stresses, while incorporating information… (more)

Subjects/Keywords: turbulence; turbulence modeling; RANS; wall jets; impinging jet; ASBM; structure based modeling; v2f

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ismail, U. (. (2014). Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f

Chicago Manual of Style (16^th Edition):

Ismail, U (author). “Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model.” 2014. Masters Thesis, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f.

MLA Handbook (7^th Edition):

Ismail, U (author). “Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model.” 2014. Web. 24 Jan 2021.

Vancouver:

Ismail U(. Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f.

Council of Science Editors:

Ismail U(. Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f

University of Notre Dame

17. Jonathan C Silver. The Acoustics and Unsteady Wall Pressure of a Circulation Control Airfoil</h1>.

Degree: Aerospace and Mechanical Engineering, 2014, University of Notre Dame

URL: https://curate.nd.edu/show/zw12z319876

► A Circulation Control (CC) airfoil uses a wall jet exiting onto a rounded trailing edge to generate lift via the Coanda effect. The aerodynamics… (more)

Subjects/Keywords: howe model; unsteady wall pressure; circulation control; cc airfoil; rmp; acoustics; curle’s equation; coanda jet

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APA (6^th Edition):

Silver, J. C. (2014). The Acoustics and Unsteady Wall Pressure of a Circulation Control Airfoil</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/zw12z319876

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Silver, Jonathan C. “The Acoustics and Unsteady Wall Pressure of a Circulation Control Airfoil</h1>.” 2014. Thesis, University of Notre Dame. Accessed January 24, 2021. https://curate.nd.edu/show/zw12z319876.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Silver, Jonathan C. “The Acoustics and Unsteady Wall Pressure of a Circulation Control Airfoil</h1>.” 2014. Web. 24 Jan 2021.

Vancouver:

Silver JC. The Acoustics and Unsteady Wall Pressure of a Circulation Control Airfoil</h1>. [Internet] [Thesis]. University of Notre Dame; 2014. [cited 2021 Jan 24]. Available from: https://curate.nd.edu/show/zw12z319876.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silver JC. The Acoustics and Unsteady Wall Pressure of a Circulation Control Airfoil</h1>. [Thesis]. University of Notre Dame; 2014. Available from: https://curate.nd.edu/show/zw12z319876

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

18. Mulinti, Rahul. PARTICLE-TURBULENCE INTERACTION OF SUSPENDED LOAD BY A FORCED JET IMPINGING ON A MOBILE SEDIMENT BED.

Degree: Mechanical Engineering, 2014, University of Maryland

URL: http://hdl.handle.net/1903/15914

► Phase-resolved two-phase flow experiments have been conducted to predict particle suspension and sedimentation within coupled particle-laden flows relevant to rotorcraft brownout conditions. Single phase and… (more)

Subjects/Keywords: Mechanical engineering; Aerospace engineering; Brownout; Particle-Turbulence; PIV; Sediment Transport; Vorticity; Wall Jet

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APA (6^th Edition):

Mulinti, R. (2014). PARTICLE-TURBULENCE INTERACTION OF SUSPENDED LOAD BY A FORCED JET IMPINGING ON A MOBILE SEDIMENT BED. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/15914

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mulinti, Rahul. “PARTICLE-TURBULENCE INTERACTION OF SUSPENDED LOAD BY A FORCED JET IMPINGING ON A MOBILE SEDIMENT BED.” 2014. Thesis, University of Maryland. Accessed January 24, 2021. http://hdl.handle.net/1903/15914.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mulinti, Rahul. “PARTICLE-TURBULENCE INTERACTION OF SUSPENDED LOAD BY A FORCED JET IMPINGING ON A MOBILE SEDIMENT BED.” 2014. Web. 24 Jan 2021.

Vancouver:

Mulinti R. PARTICLE-TURBULENCE INTERACTION OF SUSPENDED LOAD BY A FORCED JET IMPINGING ON A MOBILE SEDIMENT BED. [Internet] [Thesis]. University of Maryland; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1903/15914.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mulinti R. PARTICLE-TURBULENCE INTERACTION OF SUSPENDED LOAD BY A FORCED JET IMPINGING ON A MOBILE SEDIMENT BED. [Thesis]. University of Maryland; 2014. Available from: http://hdl.handle.net/1903/15914

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

19. Robertson Welsh, Bradley. On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets.

Degree: 2017, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:309358

► Circulation control involves tangentially blowing air around a rounded trailing edge in order to augment the lift of a wing. The advantages of this technique… (more)

▼ Circulation control involves tangentially blowing air around a rounded trailing edge in order to augment the lift of a wing. The advantages of this technique over conventional mechanical controls are reduced maintenance and lower observability. Despite the technology first being proposed in the 1960s and well-studied since, circulation control is not in widespread use today. This is largely due to the high mass flow requirements. Increasing the jet velocity increases both the efficiency (in terms of mass flow) and effectiveness. However, as the jet velocity exceeds the speed of sound, shock structures form which cause the jet to separate. Recent developments in the field of fluidic thrust vectoring (FTV) have shown that an asymmetrical convergent-divergent nozzle capable of producing an irrotational vortex (IV) has the potential to prevent separation through eliminating stream-wise pressure gradients. In this study, the feasibility of preventing separation at arbitrarily high jet velocities through the use of asymmetrical nozzle geometries designed to maintain irrotational (and stream-wise pressure gradient free) flow is explored. Furthermore, the usefulness of an adaptive nozzle geometry for the purpose of extending circulation control device efficiency and effectiveness is defined.Through a series of experiments, the flow physics of supersonic curved wall jets is characterised across a range of nozzle geometries. IV and equivalent area ratio symmetrical convergent-divergent nozzles are compared across three slot height to radius ratios (H/R): H/R = 0.1, H/R = 0.15, H/R = 0.2. The conclusion of this study is that at low H/R (0.1 and 0.15), there is no significant difference in behaviour between IV and symmetrical nozzles, whilst at high H/R (0.2), the IV nozzles begin separating whilst correctly expanded due to the propagation of pressure upstream from the edge of the reaction surface via the boundary layer. Consequently, it is shown that symmetrical nozzles of equivalent mass flow at high H/R have a higher separation NPR compared to IV nozzles. Specifically, the elimination of favourable, in addition to adverse stream-wise pressure gradients contradicts the expected behaviour of IV nozzles. The separation NPR for nozzles tested in this study, in addition to past studies is subsequently plotted against the throat height to radius ratios (A*/R). This shows that in fact, no previous experiments have shown a higher separation NPR for IV nozzles compared to symmetrical nozzles of equivalent mass flow. The overall outcome is that neither fixed geometry IV, nor adaptive nozzles are justified to maintain attachment, or to improve efficiency. This is because fixed nozzle geometries designed for higher separation NPR do not show any performance deficit when operating at lower NPRs. However, the throat height could be varied to maximise effectiveness (at the expense of mass flow). The contributions to new knowledge made by this study are as follows: the development of a new method of combining shadowgraph and schlieren images… Advisors/Committee Members: GRESIL, MATTHIEU M, Crowther, William, Gresil, Matthieu.

Subjects/Keywords: schlieren; shadowgraph; supersonic; curved; wall; jet; circulation control; fluidic thrust vectoring; FTV; CC; irrotational

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APA (6^th Edition):

Robertson Welsh, B. (2017). On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:309358

Chicago Manual of Style (16^th Edition):

Robertson Welsh, Bradley. “On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets.” 2017. Doctoral Dissertation, University of Manchester. Accessed January 24, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:309358.

MLA Handbook (7^th Edition):

Robertson Welsh, Bradley. “On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets.” 2017. Web. 24 Jan 2021.

Vancouver:

Robertson Welsh B. On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Jan 24]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:309358.

Council of Science Editors:

Robertson Welsh B. On the Influence of Nozzle Geometries on Supersonic Curved Wall Jets. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:309358

20. Kaffel, Ahmed. Analyse des structures des écoulements et des instabilités développées par un rideau d'air cisaillé latéralement par un courant externe : application au cas des meubles frigorifiques de vente : Analysis of flow structures and instabilities developed by and air curtain sheared laterally by an external stream : application to the case of refrigerated display cabinets.

Degree: Docteur es, Mécanique, 2017, Valenciennes

URL: http://www.theses.fr/2017VALE0011

►

Dans cette étude, le comportement aérodynamique du jet pariétal (Re = 8000) cisaillé latéralement par un courant de perturbation externe (ELS) de profil de vitesse… (more)

▼

Dans cette étude, le comportement aérodynamique du jet pariétal (Re = 8000) cisaillé latéralement par un courant de perturbation externe (ELS) de profil de vitesse uniforme (Ulf) a été étudié et analysé. Les expérimentations ont été réalisées par PIV et LDV sur une maquette aéraulique isotherme à échelle réduite d’un meuble frigorifique de vente. L’étude est centrée sur la région du jet située à proximité de la section de soufflage (x/e < 10) qui correspond à la zone dans laquelle se développent les instabilités et le processus de transition vers la turbulence. L’analyse des résultats obtenus avec et sans perturbation a mis en évidence que la perturbation entraîne une diminution significative du pouvoir d’entraînement du jet, une forte décroissance de la vitesse moyenne maximale, un faible épanouissement du jet et une augmentation globale des valeurs des moments d’ordre deux de toutes les composantes des contraintes de Reynolds. L’analyse par PIV résolue en temps (10 kHz) montre une topologie déformée et allongée des structures de Kelvin-Helmholtz (K-H) pour (Ulf = 0,5 ms-1) et détachée pour (Ulf = 1 ms-1). Les résultats de l’interaction mutuelle ente les couches interne et externe indiquent que le courant ELS brise partiellement le mécanisme de formation des dipôles de vortex qui deviennent irréguliers et moins prédictifs, ce qui conduit à l’allongement de la zone de transition et retarde donc l’apparition de la zone auto-similaire du jet. D’après la technique POD, l’ELS engendre une redistribution énergétique entre les modes. Le courant ELS affecte également les instabilités K-H en perturbant leur organisation bidimensionnelle, leur topologie, leur alignement et leur fréquence de passage mettant en évidence l’effet inhibiteur exercé sur le développement des structures primaires. Les corrélations spatiales Rvv reflètent la diminution des échelles de longueur dans le cas d’un jet perturbé.

In this study, the aerodynamic behavior of the plane wall jet (Re = 8000) sheared laterally by an external lateral stream (ELS) of a uniform velocity profile (Ulf) was studied and analyzed. The experiments were carried out by PIV and LDV on a reduced-scale isothermal aeraulic model of a refrigerated display cabinet. The study focuses on the near-field region of the jet (x / e <10) which corresponds to the zone of transition to turbulence and onset and development of instabilities. The results obtained with and without perturbation showed a significant decrease in the entrainment rate, a strong decrease in the maximum velocity decay rate, a lower jet expansion and an overall increase in the values of second order moments of the Reynolds stress components. The time-resolved PIV analysis (10 kHz) shows a distorted and elongated topology of the Kelvin-Helmholtz (K-H) structures for (Ulf = 0,5 ms-1) and a detached topology for (Ulf = 1 ms-1). The results of the mutual interaction between the inner and outer layers indicate that the ELS partially breaks the vortex dipole formation mechanism which becomes irregular and less predictive,…

Advisors/Committee Members: Harion, Jean-Luc (thesis director), Moureh, Jean (thesis director), Russeil, Serge (thesis director).

Subjects/Keywords: Jet pariétal; Rideau d’air; Jet perturbé; Instabilités de Kelvin-Helmholtz; Structures cohérentes; Meuble frigorifique de vente; Tr-Piv; Pod; Plane wall jet; Air curtain; Perturbed jet; Kelvin-Helmholtz instabilities; Coherent structures; Refrigerated display cabinet; Tr-Piv; Pod

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kaffel, A. (2017). Analyse des structures des écoulements et des instabilités développées par un rideau d'air cisaillé latéralement par un courant externe : application au cas des meubles frigorifiques de vente : Analysis of flow structures and instabilities developed by and air curtain sheared laterally by an external stream : application to the case of refrigerated display cabinets. (Doctoral Dissertation). Valenciennes. Retrieved from http://www.theses.fr/2017VALE0011

Chicago Manual of Style (16^th Edition):

Kaffel, Ahmed. “Analyse des structures des écoulements et des instabilités développées par un rideau d'air cisaillé latéralement par un courant externe : application au cas des meubles frigorifiques de vente : Analysis of flow structures and instabilities developed by and air curtain sheared laterally by an external stream : application to the case of refrigerated display cabinets.” 2017. Doctoral Dissertation, Valenciennes. Accessed January 24, 2021. http://www.theses.fr/2017VALE0011.

MLA Handbook (7^th Edition):

Kaffel, Ahmed. “Analyse des structures des écoulements et des instabilités développées par un rideau d'air cisaillé latéralement par un courant externe : application au cas des meubles frigorifiques de vente : Analysis of flow structures and instabilities developed by and air curtain sheared laterally by an external stream : application to the case of refrigerated display cabinets.” 2017. Web. 24 Jan 2021.

Vancouver:

Kaffel A. Analyse des structures des écoulements et des instabilités développées par un rideau d'air cisaillé latéralement par un courant externe : application au cas des meubles frigorifiques de vente : Analysis of flow structures and instabilities developed by and air curtain sheared laterally by an external stream : application to the case of refrigerated display cabinets. [Internet] [Doctoral dissertation]. Valenciennes; 2017. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2017VALE0011.

Council of Science Editors:

Kaffel A. Analyse des structures des écoulements et des instabilités développées par un rideau d'air cisaillé latéralement par un courant externe : application au cas des meubles frigorifiques de vente : Analysis of flow structures and instabilities developed by and air curtain sheared laterally by an external stream : application to the case of refrigerated display cabinets. [Doctoral Dissertation]. Valenciennes; 2017. Available from: http://www.theses.fr/2017VALE0011

21. Boehm, Mélanie. Études expérimentale et numérique de l’influence d’un jet plan pariétal sur une nappe de retour : Experimental and numerical studies of the influence of a wall attached plane jet on the backlayering.

Degree: Docteur es, Mécanique des fluides, 2011, Université Claude Bernard – Lyon I

URL: http://www.theses.fr/2011LYO10128

►

Cette thèse porte sur l'influence d'un jet plan pariétal sur une nappe de retour (backlayering). Cette étude peut être divisée en deux parties : une… (more)

▼

Cette thèse porte sur l'influence d'un jet plan pariétal sur une nappe de retour (backlayering). Cette étude peut être divisée en deux parties : une étude expérimentale et une étude numérique. Les expériences ont permis d'identifier le comportement de la nappe de retour en présence du jet. L'étude numérique débute par une validation du modèle numérique à partir des résultats de l'étude expérimentale. Une étude paramétrique est réalisée afin de déterminer l'influence du jet sur les caractéristiques et la stratification de la nappe de retour. La présence du jet plan pariétal induit une diminution de la longueur de la nappe de retour et une variation de l'épaisseur de la nappe de retour du fait de l'introduction du jet :pour une vitesse débitante fixée, l'augmentation du rapport entre la vitesse d'éjection, du jet et la vitesse débitante induit une augmentation de l'épaisseur de la nappe de retour ; pour un rapport entre la vitesse d'éjection du jet et la vitesse débitante constant, l'augmentation de la vitesse débitante conduit à un affinement de la nappe de retour. La stratification de la nappe de retour est conservée en présence du jet plan pariétal

The aim of this study is to determine the influence of a wall attached plane jet on the backlayering. This study is composed of two parts. The experimental part consists in identifying the behaviour of the backlayering in presence of the jet. The numerical part started with a validation of the numerical model using experimental study results. Then, a parametric study enables to determine the influence of the jet on the backlayering. The presence of the parietal plan jet induces a decrease of the backlayering length. Two main conclusions are achieved for the backlayering thickness change due to the jet : for a constant air flow velocity, the increase of the ratio between jet velocity and air flow velocity induces an increase of the backlayering thickness ; for a constant ratio between jet velocity and air flow velocity, the increase of the air flow velocity leads to an increase of the backlayering thickness. Finally, the backlayering stratification is maintained on the presence of the jet

Advisors/Committee Members: Buffat, Marc (thesis director).

Subjects/Keywords: Backlayering; Stratification; Jet plan pariétal; Ventilation; Incendie en tunnel; Modélisation CFD; Essais expérimentaux; Similitude; Backlayering; Stratification; Wall attached plane jet; Ventilation; Fires in tunnel; CFD; Experiments; Similarity; 620.1

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APA (6^th Edition):

Boehm, M. (2011). Études expérimentale et numérique de l’influence d’un jet plan pariétal sur une nappe de retour : Experimental and numerical studies of the influence of a wall attached plane jet on the backlayering. (Doctoral Dissertation). Université Claude Bernard – Lyon I. Retrieved from http://www.theses.fr/2011LYO10128

Chicago Manual of Style (16^th Edition):

Boehm, Mélanie. “Études expérimentale et numérique de l’influence d’un jet plan pariétal sur une nappe de retour : Experimental and numerical studies of the influence of a wall attached plane jet on the backlayering.” 2011. Doctoral Dissertation, Université Claude Bernard – Lyon I. Accessed January 24, 2021. http://www.theses.fr/2011LYO10128.

MLA Handbook (7^th Edition):

Boehm, Mélanie. “Études expérimentale et numérique de l’influence d’un jet plan pariétal sur une nappe de retour : Experimental and numerical studies of the influence of a wall attached plane jet on the backlayering.” 2011. Web. 24 Jan 2021.

Vancouver:

Boehm M. Études expérimentale et numérique de l’influence d’un jet plan pariétal sur une nappe de retour : Experimental and numerical studies of the influence of a wall attached plane jet on the backlayering. [Internet] [Doctoral dissertation]. Université Claude Bernard – Lyon I; 2011. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2011LYO10128.

Council of Science Editors:

Boehm M. Études expérimentale et numérique de l’influence d’un jet plan pariétal sur une nappe de retour : Experimental and numerical studies of the influence of a wall attached plane jet on the backlayering. [Doctoral Dissertation]. Université Claude Bernard – Lyon I; 2011. Available from: http://www.theses.fr/2011LYO10128

University of Manitoba

22. Durand, Zacharie. Experimental study of tailwater level and asymmetry ratio effects on three-dimensional offset jets.

Degree: Civil Engineering, 2014, University of Manitoba

URL: http://hdl.handle.net/1993/23902

► Supercritical fluid jets provide a complex flow pattern and are present in many engineering applications. To date, studies have focused on wall jets, free jets,… (more)

▼ Supercritical fluid jets provide a complex flow pattern and are present in many engineering applications. To date, studies have focused on wall jets, free jets, and two-dimensional offset jets. As a result, our understanding of three-dimensional offset jets is lacking. A deeper understanding of three-dimensional offset jets is important as they are seen in many engineering applications. Understanding the flow patterns of three-dimensional offset jets will aid hydraulic engineers to reduce anthropogenic effects when designing new and rehabilitating older hydraulic structures. The purpose of this study was to evaluate the effects of tailwater level and asymmetry ratio on three-dimensional offset jets. A physical model was constructed and three sets of experiments were conducted. Each set of experiments evaluated the effects of the Reynolds number, tailwater level, or asymmetry ratio. Velocity measurements were taken with an acoustic Doppler velocimeter. The acoustic Doppler velocimeter measured all three components of velocity which allowed the calculation of all six components of Reynolds shear stresses and ten components of triple velocity correlation. The effects of Reynolds number, tailwater level, and asymmetry ratio on streamwise flow development, distributions of mean velocities, and distribution of turbulence statistics were evaluated. Reynolds number effects were found to be insignificant at Reynolds number greater than 53,000. Two different trends were observed in the behavior of three-dimensional offset jets at different tailwater levels. At low tailwater levels the jet will not reattach to the channel bottom as it does at higher tailwater levels. Increasing the asymmetry ratio of an offset jet will make the jet curve towards the channel wall and bottom faster. Once reattached to the wall the velocity decay rate is greatly reduced. The results found in this study will be useful to a hydraulic engineer designing new or rehabilitating older hydraulic structures which have flow characteristics similar to that of three-dimensional offset jets. The data acquired during this study adds to the available data usable for calibration and validation of turbulence models. All three components of velocity were measured simultaneously which allowed to calculation of the six Reynolds shear stresses and ten triple velocity correlation terms. All velocities and turbulence statistics in this study were measured simultaneously which provides a data set that has rarely been seen before. Advisors/Committee Members: Clark, Shawn (Civil Engineering) Tachie, Mark(Mechanical Engineering) (supervisor), Stadnyk, Tricia (Civil Engineering) Kuhn, David (Mechanical Engineering) (examiningcommittee).

Subjects/Keywords: Three-dimensional offset jet; Acoustic Doppler velocimeter; Reynolds number; Tailwater level; Asymmetry Ratio; Offset Jets; Wall Jets; Free Jets

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Durand, Z. (2014). Experimental study of tailwater level and asymmetry ratio effects on three-dimensional offset jets. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/23902

Chicago Manual of Style (16^th Edition):

Durand, Zacharie. “Experimental study of tailwater level and asymmetry ratio effects on three-dimensional offset jets.” 2014. Masters Thesis, University of Manitoba. Accessed January 24, 2021. http://hdl.handle.net/1993/23902.

MLA Handbook (7^th Edition):

Durand, Zacharie. “Experimental study of tailwater level and asymmetry ratio effects on three-dimensional offset jets.” 2014. Web. 24 Jan 2021.

Vancouver:

Durand Z. Experimental study of tailwater level and asymmetry ratio effects on three-dimensional offset jets. [Internet] [Masters thesis]. University of Manitoba; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1993/23902.

Council of Science Editors:

Durand Z. Experimental study of tailwater level and asymmetry ratio effects on three-dimensional offset jets. [Masters Thesis]. University of Manitoba; 2014. Available from: http://hdl.handle.net/1993/23902

University of Bradford

23. Ghoma, Mohamed Ibrahem. The effect of wall jet flow on local scour hole.

Degree: PhD, 2011, University of Bradford

URL: http://hdl.handle.net/10454/5501

► This thesis reports on investigations carried out to study of the effect of horizontal wall jets on rough, fixed and mobile beds in open channel… (more)

Subjects/Keywords: 620.1; Scour hole; Wall jet; CFD; ADV; Sediment transport; Bed shear stress; Fluent Computational Fluid Dynamics; Turbulent multiphase flow; Modelling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ghoma, M. I. (2011). The effect of wall jet flow on local scour hole. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/5501

Chicago Manual of Style (16^th Edition):

Ghoma, Mohamed Ibrahem. “The effect of wall jet flow on local scour hole.” 2011. Doctoral Dissertation, University of Bradford. Accessed January 24, 2021. http://hdl.handle.net/10454/5501.

MLA Handbook (7^th Edition):

Ghoma, Mohamed Ibrahem. “The effect of wall jet flow on local scour hole.” 2011. Web. 24 Jan 2021.

Vancouver:

Ghoma MI. The effect of wall jet flow on local scour hole. [Internet] [Doctoral dissertation]. University of Bradford; 2011. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10454/5501.

Council of Science Editors:

Ghoma MI. The effect of wall jet flow on local scour hole. [Doctoral Dissertation]. University of Bradford; 2011. Available from: http://hdl.handle.net/10454/5501

Delft University of Technology

24. Bok, A. (author). De stabililteit van de bodembescherming voor een kademuur bij het gebruik van boegschroeven.

Degree: 1996, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:75a5f70c-d058-47af-9d45-5a158058746f

►

Bij het gebruik van een boegschroef bij aanleg- en afvaartmanoeuvres botst de boegschroefstraal direct tegen de kademuur. Een verticale kademuur remt de schroefstraal af en… (more)

▼

Bij het gebruik van een boegschroef bij aanleg- en afvaartmanoeuvres botst de boegschroefstraal direct tegen de kademuur. Een verticale kademuur remt de schroefstraal af en buigt hem om, waarna een alzijdige wandstraal ontstaat (d.w.z. een straal die in alle richtingen in een verticaal vlak voor de kademuur uitstroomt). Het uitstromen van deze wandstraal wordt vervolgens begrensd door het wateroppervlak en door de bodem. Na het afremmen en ombuigen van de verticale wandstraal ontstaat een horizontale straal over de bodem en vlak onder de waterspiegel. Bij een combinatie van een geringe afstand tussen het schip en de kade en een geringe kielspeling onder het schip kan de schroefstraal zich slechts zeer beperkt spreiden, waardoor rekening moet worden gehouden met grote stroomsnelheden aan de bodem. Met name schepen uitgerust met een groot boegschroefvermogen, zoals containerschepen, kunnen in deze situatie een zware belasting op de bodembescherming geven. Omdat er wereldwijd een grote groei van het aantal containerschepen wordt voorspeld, en omdat er in de Rotterdamse haven naar gestreefd wordt om deze schepen zelfstandig, met gebruik van de boegschroef, te laten afmeren en wegvaren, wordt het steeds belangrijker om een goed inzicht te krijgen in het ontgrondingsproces voor de kademuur. Om een bodembescherming te kunnen dimensioneren op de belasting door een omgebogen schroefstraal zijn twee rekenrelaties nodig: een relatie om de stroomsnelheid in de schroefstraal boven de bodem te berekenen een relatie om de bodembescherming te dimensioneren. Er bestaan verschillende relaties voor de berekening van de stroomsnelheden in een schroefstraal loodrecht op een kademuur. Deze relaties zijn, voor zover bekend, nooit goed getoetst. In de relatie voor de dimensionering van de bodembestorting komt een coefficient voor, waarvoor behoorlijk uiteenlopende waarden worden gegeven.

Hydraulic Engineering

Civil Engineering and Geosciences

Advisors/Committee Members: Schiereck, G.J. (mentor), Fontijn, H.L. (mentor), D' Angremond, K. (mentor).

Subjects/Keywords: bow thruster; bed stability; quay wall; jet flow

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APA (6^th Edition):

Bok, A. (. (1996). De stabililteit van de bodembescherming voor een kademuur bij het gebruik van boegschroeven. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:75a5f70c-d058-47af-9d45-5a158058746f

Chicago Manual of Style (16^th Edition):

Bok, A (author). “De stabililteit van de bodembescherming voor een kademuur bij het gebruik van boegschroeven.” 1996. Masters Thesis, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:75a5f70c-d058-47af-9d45-5a158058746f.

MLA Handbook (7^th Edition):

Bok, A (author). “De stabililteit van de bodembescherming voor een kademuur bij het gebruik van boegschroeven.” 1996. Web. 24 Jan 2021.

Vancouver:

Bok A(. De stabililteit van de bodembescherming voor een kademuur bij het gebruik van boegschroeven. [Internet] [Masters thesis]. Delft University of Technology; 1996. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:75a5f70c-d058-47af-9d45-5a158058746f.

Council of Science Editors:

Bok A(. De stabililteit van de bodembescherming voor een kademuur bij het gebruik van boegschroeven. [Masters Thesis]. Delft University of Technology; 1996. Available from: http://resolver.tudelft.nl/uuid:75a5f70c-d058-47af-9d45-5a158058746f

University of Windsor

25. Tu, Peter K. C. An experimental investigation of the flow in a plane wall jet with an initial gap.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 1965, University of Windsor

URL: https://scholar.uwindsor.ca/etd/6407

Subjects/Keywords: A; EXPERIMENTAL; FLOW; GAP; INITIAL; INVESTIGATION; JET; PLANE; WALL

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tu, P. K. C. (1965). An experimental investigation of the flow in a plane wall jet with an initial gap. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6407

Chicago Manual of Style (16^th Edition):

Tu, Peter K C. “An experimental investigation of the flow in a plane wall jet with an initial gap.” 1965. Masters Thesis, University of Windsor. Accessed January 24, 2021. https://scholar.uwindsor.ca/etd/6407.

MLA Handbook (7^th Edition):

Tu, Peter K C. “An experimental investigation of the flow in a plane wall jet with an initial gap.” 1965. Web. 24 Jan 2021.

Vancouver:

Tu PKC. An experimental investigation of the flow in a plane wall jet with an initial gap. [Internet] [Masters thesis]. University of Windsor; 1965. [cited 2021 Jan 24]. Available from: https://scholar.uwindsor.ca/etd/6407.

Council of Science Editors:

Tu PKC. An experimental investigation of the flow in a plane wall jet with an initial gap. [Masters Thesis]. University of Windsor; 1965. Available from: https://scholar.uwindsor.ca/etd/6407

University of Windsor

26. Lozon, J. P. Streamwise curvature effects on turbulent wall jet heat transfer.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 1971, University of Windsor

URL: https://scholar.uwindsor.ca/etd/6688

Subjects/Keywords: CURVATURE; EFFECTS; HEAT; JET; STREAMWISE; TRANSFER; TURBULENT; WALL

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lozon, J. P. (1971). Streamwise curvature effects on turbulent wall jet heat transfer. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6688

Chicago Manual of Style (16^th Edition):

Lozon, J P. “Streamwise curvature effects on turbulent wall jet heat transfer.” 1971. Masters Thesis, University of Windsor. Accessed January 24, 2021. https://scholar.uwindsor.ca/etd/6688.

MLA Handbook (7^th Edition):

Lozon, J P. “Streamwise curvature effects on turbulent wall jet heat transfer.” 1971. Web. 24 Jan 2021.

Vancouver:

Lozon JP. Streamwise curvature effects on turbulent wall jet heat transfer. [Internet] [Masters thesis]. University of Windsor; 1971. [cited 2021 Jan 24]. Available from: https://scholar.uwindsor.ca/etd/6688.

Council of Science Editors:

Lozon JP. Streamwise curvature effects on turbulent wall jet heat transfer. [Masters Thesis]. University of Windsor; 1971. Available from: https://scholar.uwindsor.ca/etd/6688

Virginia Tech

27. Catlett, Matthew Ryan. Flow Induced Noise from Turbulent Flow over Steps and Gaps.

Degree: MS, Aerospace and Ocean Engineering, 2010, Virginia Tech

URL: http://hdl.handle.net/10919/32926

► The existence of small surface discontinuities on a flow surface generate significant pressure fluctuations which can manifest as radiated far field sound and affect the… (more)

▼ The existence of small surface discontinuities on a flow surface generate significant pressure fluctuations which can manifest as radiated far field sound and affect the fluctuating near wall pressure field exerted on the flow surface. A significant amount of research has been performed on various step and gap flows; however few have dealt with step heights that are small relative to the incoming boundary layer. Fewer still have been concerned with measuring the effect on the fluctuating wall pressure field or the radiated far field sound from these small surface discontinuities. This study presents the work aimed at scaling the radiated sound from small forward and backward steps, detailing the surface pressure field as a result of these steps, and detailing the far field sound radiated from gap configurations of similar dimension. These measurements were performed in the Virginia Tech Anechoic Wall Jet facility for step heights that ranged from approximately 10% to 100% of the incoming boundary layer height. The results show the influence of step height and boundary layer velocity on the far field sound from forward and backward steps. Very little directivity is seen for either source and the larger step heights considered in this study are shown to not be acoustically compact. A new mixed scaling normalization is proposed for the far field spectra from both types of step, which is shown to reliably collapse the data. Backward steps are shown to be much weaker producers of far field sound than a similarly sized forward step. The implications of this behavior are discussed with respect to the far field sound measured from various gap flows. The fluctuating wall pressure field was measured upstream and downstream of both step configurations. The data shows a slow recovery of the wall pressure field with lasting disturbances up to 100 step heights downstream of the step feature. Advisors/Committee Members: Devenport, William J. (committeechair), Glegg, Stewart A. L. (committee member), Simpson, Roger L. (committee member).

Subjects/Keywords: wall jet; step noise; gap noise; surface pressure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Catlett, M. R. (2010). Flow Induced Noise from Turbulent Flow over Steps and Gaps. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32926

Chicago Manual of Style (16^th Edition):

Catlett, Matthew Ryan. “Flow Induced Noise from Turbulent Flow over Steps and Gaps.” 2010. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/32926.

MLA Handbook (7^th Edition):

Catlett, Matthew Ryan. “Flow Induced Noise from Turbulent Flow over Steps and Gaps.” 2010. Web. 24 Jan 2021.

Vancouver:

Catlett MR. Flow Induced Noise from Turbulent Flow over Steps and Gaps. [Internet] [Masters thesis]. Virginia Tech; 2010. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/32926.

Council of Science Editors:

Catlett MR. Flow Induced Noise from Turbulent Flow over Steps and Gaps. [Masters Thesis]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/32926

Virginia Tech

28. Rasnick, Matthew Byron. The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements.

Degree: MS, Aerospace and Ocean Engineering, 2010, Virginia Tech

URL: http://hdl.handle.net/10919/33202

► This study focuses on measuring and normalizing the roughness noise of multiple roughness types across numerous layouts and flow speeds. Using the Virginia Tech Anechoic… (more)

Subjects/Keywords: roughness noise; wall jet; unsteady drag; rough wall turbulent boundary layer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rasnick, M. B. (2010). The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33202

Chicago Manual of Style (16^th Edition):

Rasnick, Matthew Byron. “The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements.” 2010. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/33202.

MLA Handbook (7^th Edition):

Rasnick, Matthew Byron. “The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements.” 2010. Web. 24 Jan 2021.

Vancouver:

Rasnick MB. The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements. [Internet] [Masters thesis]. Virginia Tech; 2010. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/33202.

Council of Science Editors:

Rasnick MB. The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements. [Masters Thesis]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/33202

Virginia Tech

29. Grissom, Dustin Leonard. A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces.

Degree: PhD, Aerospace and Ocean Engineering, 2007, Virginia Tech

URL: http://hdl.handle.net/10919/28336

► The far field acoustics generated by turbulent flow over rough surfaces has been experimentally investigated in an acoustically treated wall jet facility. The facility allows… (more)

▼ The far field acoustics generated by turbulent flow over rough surfaces has been experimentally investigated in an acoustically treated wall jet facility. The facility allows direct measurement of the far field sound from small patches of surface roughness, without contamination from edge or other aerodynamic noise sources. The facility is capable of generating turbulent boundary layer flows with momentum thickness Reynolds numbers between 450 and 1160. The variation of surface conditions tested cover the range from hydrodynamically smooth surfaces through most of the transitional range, with h+ variations from 3 to 85. Single microphone narrow band acoustic spectra, measured in the far field, show sound levels as much as 15 dB above the background from 0.186 m2 roughness patches. The measurements revealed the spectral shape and level variations with flow velocity, boundary layer thickness, and roughness size; providing the first data set large enough to assess the affects of many aerodynamic properties on the acoustic spectra. Increases in the size of grit type roughness produced significant increases in acoustic levels. Patches of hydrodynamically smooth roughness generated measurable acoustic levels, confirming that acoustic scattering is at least one of the physical mechanisms responsible for roughness noise. The shapes of the measured spectra show a strong dependence on the form of the surface roughness. The acoustic spectra generated by periodic two-dimensional surfaces have a much narrower louder peak than that generated by three-dimensional grit type roughness. Measurements also show the orientation of the two-dimensional surface significantly affects the acoustic levels and directivity. The variation of sound levels with flow velocity and roughness size suggests the acoustic field is significantly affected by changes in the near wall flow due to the presence of the roughness. Current models of noise generated by rough surfaces predict the general trends seen in measurements for flows over grit and two-dimensional roughness in the range of 20<h+<50. However, in cases with a low Reynolds number or large grit size, where the roughness is likely to significantly affect the hydrodynamic pressure field, the scattering models did not perform as well. Advisors/Committee Members: Devenport, William J. (committeechair), Glegg, Stewart A. L. (committee member), Johnson, Martin E. (committee member), Burdisso, Ricardo A. (committee member), Simpson, Roger L. (committee member).

Subjects/Keywords: turbulent flow noise; wall jet; rough wall boundary layer noise; acoustic scattering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Grissom, D. L. (2007). A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28336

Chicago Manual of Style (16^th Edition):

Grissom, Dustin Leonard. “A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces.” 2007. Doctoral Dissertation, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/28336.

MLA Handbook (7^th Edition):

Grissom, Dustin Leonard. “A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces.” 2007. Web. 24 Jan 2021.

Vancouver:

Grissom DL. A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces. [Internet] [Doctoral dissertation]. Virginia Tech; 2007. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/28336.

Council of Science Editors:

Grissom DL. A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces. [Doctoral Dissertation]. Virginia Tech; 2007. Available from: http://hdl.handle.net/10919/28336

University of Windsor

30. Tu, Peter Kuo-Chih. Curvature effects on a turbulent jet flow over a wall.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 1968, University of Windsor

URL: https://scholar.uwindsor.ca/etd/6063

Subjects/Keywords: A; CURVATURE; CURVATURE EFFECTS; Curvature effects; EFFECTS; FLOW; JET; OVER; TURBULENT; TURBULENT JET FLOW; Turbulent jet flow; WALL

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tu, P. K. (1968). Curvature effects on a turbulent jet flow over a wall. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6063

Chicago Manual of Style (16^th Edition):

Tu, Peter Kuo-Chih. “Curvature effects on a turbulent jet flow over a wall.” 1968. Doctoral Dissertation, University of Windsor. Accessed January 24, 2021. https://scholar.uwindsor.ca/etd/6063.

MLA Handbook (7^th Edition):

Tu, Peter Kuo-Chih. “Curvature effects on a turbulent jet flow over a wall.” 1968. Web. 24 Jan 2021.

Vancouver:

Tu PK. Curvature effects on a turbulent jet flow over a wall. [Internet] [Doctoral dissertation]. University of Windsor; 1968. [cited 2021 Jan 24]. Available from: https://scholar.uwindsor.ca/etd/6063.

Council of Science Editors:

Tu PK. Curvature effects on a turbulent jet flow over a wall. [Doctoral Dissertation]. University of Windsor; 1968. Available from: https://scholar.uwindsor.ca/etd/6063

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