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Delft University of Technology
1.
Vargas Jimenez, J.A. (author).
Development of a Wave Drag Prediction Tool for the Conceptual Design Phase.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:fadcbb6a-67f8-419b-9e4f-a546866c738a 
► The goal of this thesis is to improve the wave drag estimation techniques in the aircraft conceptual design. Based on the most relevant methods, among…
(more)
▼ The goal of this thesis is to improve the wave drag estimation techniques in the aircraft conceptual design. Based on the most relevant methods, among those developed in the past 60 years, three methods are proposed as an attempt to include more design variables and improve the accuracy of the wave drag prediction. The proposed methods include the use of supercritical airfoils and the cross sectional area distribution of the aircraft as port of the wave drag estimation. The proposed methods are compared to experimental drag data, available in the literature, of four high-subsonic conventional transport aircraft. An accuracy analysis is performed evaluating how well each method predicts the drag divergence Mach number, the wave drag at Mach number 0.8, and how well the predicted curve fitted with the experimental data. The analysis led to the conclusion that the results of the Delta method shows better agreement with the experimental data than the proposed methods. The state of the art techniques and the proposed methods have been implemented and integrated into a conceptual design tool, as a new module. The module functionality, including its settings, inputs, outputs and functions are also described in this document.
Flight performance and propulsion
Flight performance and propulsion
Aerospace Engineering
Advisors/Committee Members: Vos, R. (mentor).
Subjects/Keywords: wave drag
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APA (6th Edition):
Vargas Jimenez, J. A. (. (2015). Development of a Wave Drag Prediction Tool for the Conceptual Design Phase. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:fadcbb6a-67f8-419b-9e4f-a546866c738a
Chicago Manual of Style (16th Edition):
Vargas Jimenez, J A (author). “Development of a Wave Drag Prediction Tool for the Conceptual Design Phase.” 2015. Masters Thesis, Delft University of Technology. Accessed January 25, 2021.
http://resolver.tudelft.nl/uuid:fadcbb6a-67f8-419b-9e4f-a546866c738a.
MLA Handbook (7th Edition):
Vargas Jimenez, J A (author). “Development of a Wave Drag Prediction Tool for the Conceptual Design Phase.” 2015. Web. 25 Jan 2021.
Vancouver:
Vargas Jimenez JA(. Development of a Wave Drag Prediction Tool for the Conceptual Design Phase. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 25].
Available from: http://resolver.tudelft.nl/uuid:fadcbb6a-67f8-419b-9e4f-a546866c738a.
Council of Science Editors:
Vargas Jimenez JA(. Development of a Wave Drag Prediction Tool for the Conceptual Design Phase. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:fadcbb6a-67f8-419b-9e4f-a546866c738a
Penn State University
2.
Hassa, Christopher Louis.
Drag Coefficient Estimation using Satellite Attitude and Orbit Data.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/19949
► The coefficient of drag for spacecraft in a variety of orbits and solar cycle conditions is generally assumed to be a constant value of 2.2.…
(more)
▼ The coefficient of
drag for spacecraft in a variety of orbits and solar cycle conditions is generally assumed to be a constant value of 2.2. The research herein revisits the validity of this assumption and chooses to directly calculate the coefficient of
drag using orbital data gathered from NASA’s Swift spacecraft. In order to accomplish this task, an accurate cross-sectional area calculation algorithm is generated and an atmospheric model is utilized. The area algorithm accurately predicts the operational cross-sectional area of Swift at any given orientation. The density model used is the NRLMSISE-00 atmospheric model, which, when compared to the internally calculated density values assuming the coefficient of
drag is 2.2, show large amounts of error.
The uncertainty of the density at the altitude of Swift leads to an extended analysis of its orbital decay, giving the best estimate of a no-earlier-than deorbit date of mid-2022 to early 2023. This analysis proved inconclusive, however, as no single model followed the actual decay of Swift, implying that the coefficient of
drag may change over the mission’s duration.
The results of the calculation of the coefficient of
drag clearly show that no single value can be assumed as correct. However, some of these results also fall outside of the expected bounds of the coefficient of
drag, implying that additional research is required to incorporate additional variables to properly determine what values of the coefficient of
drag to use and when.
Advisors/Committee Members: David Bradley Spencer, Thesis Advisor/Co-Advisor, Sven G Bilen, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Swift; coefficient of drag; spacecraft drag coefficient
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APA (6th Edition):
Hassa, C. L. (2013). Drag Coefficient Estimation using Satellite Attitude and Orbit Data. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hassa, Christopher Louis. “Drag Coefficient Estimation using Satellite Attitude and Orbit Data.” 2013. Thesis, Penn State University. Accessed January 25, 2021.
https://submit-etda.libraries.psu.edu/catalog/19949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hassa, Christopher Louis. “Drag Coefficient Estimation using Satellite Attitude and Orbit Data.” 2013. Web. 25 Jan 2021.
Vancouver:
Hassa CL. Drag Coefficient Estimation using Satellite Attitude and Orbit Data. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Jan 25].
Available from: https://submit-etda.libraries.psu.edu/catalog/19949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hassa CL. Drag Coefficient Estimation using Satellite Attitude and Orbit Data. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Pedro Henrique Almeida Bezerra.
PicumÃ: perfornace drag queen em uma epistemologia decolonial.
Degree: Master, 2018, Universidade Federal do Ceará
URL: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=20511
;
► A prÃtica drag queen diz respeito a um processo de adequaÃÃo que desloca a aparÃncia corriqueira de uma pessoa para uma outra que pode transitar…
(more)
▼ A prÃtica drag queen diz respeito a um processo de adequaÃÃo que desloca a
aparÃncia corriqueira de uma pessoa para uma outra que pode transitar entre
gÃneros (masculino, feminino, polimorfo, diversos) e espÃcies (humano e animal,
como à o caso de drags que se apresentam como animais e atà alienÃgenas). O
presente trabalho tem por objetivo observar e participar dessa prÃtica na cidade de
Fortaleza â CE com intuito de absorver seus processos de criaÃÃo, adaptaÃÃo,
montagem e desmontagem. Entender as mutaÃÃes as quais essa prÃtica estÃ
sujeita, as influÃncias externas e a capacidade de adaptaÃÃo das drag queens
estudadas. Usar lentes analÃticas que possibilitem enxergar as prÃticas atravÃs de
uma epistemologia da performance que leve em consideraÃÃo a decolonizaÃÃo do
pensamento e a apreensÃo crÃtica da tradiÃÃo cientÃfica europeia. O estudo se
configura por meio de uma experiÃncia etnogrÃfica embasada no exercÃcio da
descriÃÃo densa e de entrevistas pontuais. Os registros foram feitos mediante diÃrio
de campo, fotografias, vÃdeos e gravador de voz. Concluiu-se que a prÃtica drag
queen na cidade de Fortaleza â CE passou e passa por mudanÃas constantes no
que diz respeito à tradiÃÃo e ao surgimento de novas formas de fazer drag. Formas
essas impactadas pelo reality show americano RuPaulâs Drag Race e sua tendÃncia
de transformaÃÃo da drag queen em um produto passÃvel de ser comercializado
mundialmente atravÃs da TV. Observou-se ainda que, ademais da forte influÃncia
trazida por esse reality show, o contexto local tem se mostrado resistente Ãs
tentativas de suplantaÃÃo da tradiÃÃo, tendo como elementos de resistÃncia o batecabelo
e o dialeto yorubà que se contrapÃem à forÃa histÃrica de opressÃo
conhecida como colonizaÃÃo.
A prÃtica drag queen diz respeito a um processo de adequaÃÃo que desloca a
aparÃncia corriqueira de uma pessoa para uma outra que pode transitar entre
gÃneros (masculino, feminino, polimorfo, diversos) e espÃcies (humano e animal,
como à o caso de drags que se apresentam como animais e atà alienÃgenas). O
presente trabalho tem por objetivo observar e participar dessa prÃtica na cidade de
Fortaleza â CE com intuito de absorver seus processos de criaÃÃo, adaptaÃÃo,
montagem e desmontagem. Entender as mutaÃÃes as quais essa prÃtica estÃ
sujeita, as influÃncias externas e a capacidade de adaptaÃÃo das drag queens
estudadas. Usar lentes analÃticas que possibilitem enxergar as prÃticas atravÃs de
uma epistemologia da performance que leve em consideraÃÃo a decolonizaÃÃo do
pensamento e a apreensÃo crÃtica da tradiÃÃo cientÃfica europeia. O estudo se
configura por meio de uma experiÃncia etnogrÃfica embasada no exercÃcio da
descriÃÃo densa e de entrevistas pontuais. Os registros foram feitos mediante diÃrio
de campo, fotografias, vÃdeos e gravador de voz. Concluiu-se que a prÃtica drag
queen na cidade de Fortaleza â CE passou e passa por mudanÃas constantes no
que diz respeito à tradiÃÃo e ao surgimento de novas formas de fazer drag. Formas
essas impactadas pelo reality show americano RuPaulâs Drag Race e…
Advisors/Committee Members: Irlys Alencar Firmo Barreira.
Subjects/Keywords: SOCIOLOGIA; Drag queen; GÃnero; Decolonialidade; RuPaulâs Drag Race; Drag queen; Genre; Decoloniality; RuPaulâs Drag Race.; SOCIOLOGIA; Drag queen; GÃnero; Decolonialidade; RuPaulâs Drag Race; Drag queen; Genre; Decoloniality; RuPaulâs Drag Race.
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APA (6th Edition):
Bezerra, P. H. A. (2018). PicumÃ: perfornace drag queen em uma epistemologia decolonial. (Masters Thesis). Universidade Federal do Ceará. Retrieved from http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=20511 ;
Chicago Manual of Style (16th Edition):
Bezerra, Pedro Henrique Almeida. “PicumÃ: perfornace drag queen em uma epistemologia decolonial.” 2018. Masters Thesis, Universidade Federal do Ceará. Accessed January 25, 2021.
http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=20511 ;.
MLA Handbook (7th Edition):
Bezerra, Pedro Henrique Almeida. “PicumÃ: perfornace drag queen em uma epistemologia decolonial.” 2018. Web. 25 Jan 2021.
Vancouver:
Bezerra PHA. PicumÃ: perfornace drag queen em uma epistemologia decolonial. [Internet] [Masters thesis]. Universidade Federal do Ceará 2018. [cited 2021 Jan 25].
Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=20511 ;.
Council of Science Editors:
Bezerra PHA. PicumÃ: perfornace drag queen em uma epistemologia decolonial. [Masters Thesis]. Universidade Federal do Ceará 2018. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=20511 ;
University of Oregon
4.
Herrera, Andrea.
Alien Femininities: Transcending Gender through Drag in an Aesthetically Restrictive Culture.
Degree: PhD, Department of Sociology, 2020, University of Oregon
URL: https://scholarsbank.uoregon.edu/xmlui/handle/1794/25653
► In this dissertation, I conceptualize femininities not as a static category of gender performance, but as a set of shifting configurations of dress, cosmetics, bodily…
(more)
▼ In this dissertation, I conceptualize femininities not as a static category of gender performance, but as a set of shifting configurations of dress, cosmetics, bodily comportment, and behaviors inflected by race, class, gender, sexuality, ability, age, body size/shape, and facial beauty. Non-cisgender-male
drag queens who embody exaggerated forms of femininity defend their contested participation in
drag culture by defining
drag as a multi-gender queer culture based on the staged exaggeration of quotidian gender, against mainstream definitions of
drag as the cross-gender performance of a (cis) man dressing up as a (cis) woman. Because these queens are
subject to sex-gendered double standards for the intracultural legitimation of their temporary accomplishment of the queer gender
Drag Queen, many queens incorporate stylistic elements based on aliens and other fantastical creatures as a form of aesthetic overcompensation to preempt critiques from audiences and cis male
drag queens. The embodiment of alien femininities also enables the participants in this research to temporarily transcend cultural restrictions on aesthetics and self-presentation, especially those based on quotidian gender, which they conceptualize through a framework of trans-inclusionary gender essentialism. Through this discourse of gender, participants and I consider together the political potentialities of femme, a quotidian queer gender, and alien femininities, a temporarily-embodied queer gender, excavating a ripple-effect theory of social change in which feelings at the micro level animate interactional and (sub)cultural shifts at the meso level which then ripple outward and upward to restructure and, hopefully, help dismantle systems of normalizing power at the macro level.
Advisors/Committee Members: Pascoe, CJ (advisor).
Subjects/Keywords: Aliens; Drag; Drag Queens; Embodiment; Femininities; Femme
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APA (6th Edition):
Herrera, A. (2020). Alien Femininities: Transcending Gender through Drag in an Aesthetically Restrictive Culture. (Doctoral Dissertation). University of Oregon. Retrieved from https://scholarsbank.uoregon.edu/xmlui/handle/1794/25653
Chicago Manual of Style (16th Edition):
Herrera, Andrea. “Alien Femininities: Transcending Gender through Drag in an Aesthetically Restrictive Culture.” 2020. Doctoral Dissertation, University of Oregon. Accessed January 25, 2021.
https://scholarsbank.uoregon.edu/xmlui/handle/1794/25653.
MLA Handbook (7th Edition):
Herrera, Andrea. “Alien Femininities: Transcending Gender through Drag in an Aesthetically Restrictive Culture.” 2020. Web. 25 Jan 2021.
Vancouver:
Herrera A. Alien Femininities: Transcending Gender through Drag in an Aesthetically Restrictive Culture. [Internet] [Doctoral dissertation]. University of Oregon; 2020. [cited 2021 Jan 25].
Available from: https://scholarsbank.uoregon.edu/xmlui/handle/1794/25653.
Council of Science Editors:
Herrera A. Alien Femininities: Transcending Gender through Drag in an Aesthetically Restrictive Culture. [Doctoral Dissertation]. University of Oregon; 2020. Available from: https://scholarsbank.uoregon.edu/xmlui/handle/1794/25653
5.
Landeros, Steph O.
Drag Beyond Metronormativity Experiences of Drag Performers in Small Towns and "Ordinary Cities".
Degree: 2019, University of Nevada – Reno
URL: http://hdl.handle.net/11714/6666
► Rural towns and small cities are not typically perceived as welcoming or safe environments for LGBTQ people. However, many LGBTQ people do live in rural…
(more)
▼ Rural towns and small cities are not typically perceived as welcoming or safe environments for LGBTQ people. However, many LGBTQ people do live in rural towns and smaller cities. In this study, I interview 18
drag performers from Ordinary Cities (OC) and Small towns (ST). My findings show that
drag performers in OCs are more likely to feel unsafe within queer spaces than performers from STs. Participants of color in both ordinary cities and small towns reported experiences of tokenism and racial exclusion. Finally, my findings show that
drag kings in both settings were the most likely to experience exclusion from local
drag communities. I use these findings to argue that rural towns and small cities can be welcoming and safe environments for queer folks—specifically
drag performers. Additionally, these city/town settings can impact the safety of performers dependent on availability of queer space.
Advisors/Committee Members: Gruys, Kjerstin (advisor), Evans, Mariah D. R. (advisor), Huerta, Lydia (committee member).
Subjects/Keywords: Drag; Drag Performer; LGBTQ; Place; Queer; Space
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APA (6th Edition):
Landeros, S. O. (2019). Drag Beyond Metronormativity Experiences of Drag Performers in Small Towns and "Ordinary Cities". (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/6666
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Landeros, Steph O. “Drag Beyond Metronormativity Experiences of Drag Performers in Small Towns and "Ordinary Cities".” 2019. Thesis, University of Nevada – Reno. Accessed January 25, 2021.
http://hdl.handle.net/11714/6666.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Landeros, Steph O. “Drag Beyond Metronormativity Experiences of Drag Performers in Small Towns and "Ordinary Cities".” 2019. Web. 25 Jan 2021.
Vancouver:
Landeros SO. Drag Beyond Metronormativity Experiences of Drag Performers in Small Towns and "Ordinary Cities". [Internet] [Thesis]. University of Nevada – Reno; 2019. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/11714/6666.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Landeros SO. Drag Beyond Metronormativity Experiences of Drag Performers in Small Towns and "Ordinary Cities". [Thesis]. University of Nevada – Reno; 2019. Available from: http://hdl.handle.net/11714/6666
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
6.
Poursaeidesfahani, A. (author).
Investigation of the effects of drag reducing polymers on stratified flows.
Degree: 2014, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:88cfdd3a-3263-42fe-8c17-8e1560863bff
► According to the increasing distance between the processing facilities and the oil and gas production sites, especially at subsea production sites (where multiphase flows commonly…
(more)
▼ According to the increasing distance between the processing facilities and the oil and gas production sites, especially at subsea production sites (where multiphase flows commonly occur), innovative methods are demanded to help reducing the cost of multiphase flow transportation through the pipelines. In the past decades, Drag Reducing Polymers (DRPs) have been drawing attention in industry and academia. However, in these works it was predominately focused on single phase flows while limited attention was paid to multiphase flows. In order to improve the understanding of the influences of the DRPs on horizontal stratified gas-liquid flows, a conventional air-water flow loop is used in this study. The “Conductance probes method” and flow visualization with high speed camera are used to examine the morphology of the gas-liquid interface. The conductance probe sensors and required electrical circuits are built as a part of this project. The stratified flow of gas and liquid provides the most suitable flow configuration to validate the equipment which was built to measure the time variations of the liquid film height. The effects of drag reducing polymers on stratified gas-liquid flows and particularly the effects of DRPs on the interfacial phenomena as the crucial characteristics of the stratified flows are discussed in this study. Polyacrylamide with the molecular weight of 15000 kg/mol is used in this study. To get more insight on the rheological properties of polymeric solutions, the characteristics of solutions including static and dynamic surface tensions, dynamic and complex viscosities are measured. In order to find a link between these properties and the results obtained from the flow loop tests, the effects of polymer concentration on these properties are also investigated. In this research the relevance of the gas and liquid flow rates to the drag reduction phenomenon is studied. The highest drag reduction observed in this study (about 55 percent) is obtained at the greatest liquid and gas superficial velocities. The maximum drag reduction of a stratified flow is compared with the one obtained from single phase flow of water. Additionally, in this study it is tried to focus on the behavior of the interface between the gas and the liquid by adding polymers. Roll waves’ frequency, velocity and shape as well as the influences of the drag reducing polymers on the roll wave’s properties are discussed as well. Finally a model is proposed to assess the drag reduction of stratified flows as a function of the changes in liquid holdup and the interfacial properties such as disturbances and the shape of the interface.
Process and Energy
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Boersma, B. (mentor).
Subjects/Keywords: drag reducing polymers
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Manager
APA (6th Edition):
Poursaeidesfahani, A. (. (2014). Investigation of the effects of drag reducing polymers on stratified flows. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:88cfdd3a-3263-42fe-8c17-8e1560863bff
Chicago Manual of Style (16th Edition):
Poursaeidesfahani, A (author). “Investigation of the effects of drag reducing polymers on stratified flows.” 2014. Masters Thesis, Delft University of Technology. Accessed January 25, 2021.
http://resolver.tudelft.nl/uuid:88cfdd3a-3263-42fe-8c17-8e1560863bff.
MLA Handbook (7th Edition):
Poursaeidesfahani, A (author). “Investigation of the effects of drag reducing polymers on stratified flows.” 2014. Web. 25 Jan 2021.
Vancouver:
Poursaeidesfahani A(. Investigation of the effects of drag reducing polymers on stratified flows. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Jan 25].
Available from: http://resolver.tudelft.nl/uuid:88cfdd3a-3263-42fe-8c17-8e1560863bff.
Council of Science Editors:
Poursaeidesfahani A(. Investigation of the effects of drag reducing polymers on stratified flows. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:88cfdd3a-3263-42fe-8c17-8e1560863bff
University of Illinois – Urbana-Champaign
7.
McClary, Michelle.
Assessment of hypersonic separation dynamics for drag modulation entry systems at Mars.
Degree: MS, Aerospace Engineering, 2020, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/108498
► This thesis presents an analysis of the hypersonic separation dynamics for a drag modulation entry system, consisting of a planetary entry vehicle and deployable drag…
(more)
▼ This thesis presents an analysis of the hypersonic separation dynamics for a
drag modulation entry system, consisting of a planetary entry vehicle and deployable
drag area, that performs a jettison event during planetary entry or aerocapture. The entry vehicle is modeled as a blunted spherecone and the deployable
drag area is modeled as a conical frustum. Hypersonic aerodynamic coefficients are obtained with Newtonian Aerodynamics. The first portion of the thesis identifies separation times for a range of vehicle parameters and flight conditions which includes vehicle size,
drag area size, and jettison velocity. For a given entry trajectory, a minimum separation time is found for a jettison velocity that corresponds to maximum dynamic pressure. Results show that entry vehicles with a larger initial ballistic coefficient will require less time to achieve a separation distance of one
drag area aft radius in addition to a smaller range of separation times over possible jettison conditions.
The second portion of this work determines if recontact occurs between the two bodies after jettison and explores the affect of applying an impulse to the
drag area at jettison to improve jettison performance. Emphasis is placed on determining what flight conditions lead to a recontact-free jettison event and, for jettison events that are not successful, how large of an impulse must be applied to prevent recontact. Results indicate recontact is most likely to occur at jettison conditions with low dynamic pressures and an impulse is required when jettison occurs with large angle of attack and angle of attack rates in conjunction with small differences in ballistic coefficient between the entry vehicle and
drag area.
Sensitivity analysis is performed to determine which conditions are most important to the success of the jettison event. Results show that the difference in ballistic coefficient between entry vehicle and
drag area is the most influential parameter in determining the recontact-free jettison envelope. This envelope can be manipulated through moving the
drag area center of gravity off of the axis of symmetry. Overall, results indicate a successful jettison, with no recontact, is possible and likely for typical blunt body spherecone entry trajectories and attitude dynamics. Minimizing the chance of recontact for entry trajectories can be achieved through a jettison event closer to maximum dynamic pressure which will also reduce the time to separate.
Advisors/Committee Members: Putnam, Zachary R (advisor).
Subjects/Keywords: Discrete-Event Drag Modulation; Drag Modulation Separation Dynamics; Drag Modulation Recontact Analysis
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APA (6th Edition):
McClary, M. (2020). Assessment of hypersonic separation dynamics for drag modulation entry systems at Mars. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/108498
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
McClary, Michelle. “Assessment of hypersonic separation dynamics for drag modulation entry systems at Mars.” 2020. Thesis, University of Illinois – Urbana-Champaign. Accessed January 25, 2021.
http://hdl.handle.net/2142/108498.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McClary, Michelle. “Assessment of hypersonic separation dynamics for drag modulation entry systems at Mars.” 2020. Web. 25 Jan 2021.
Vancouver:
McClary M. Assessment of hypersonic separation dynamics for drag modulation entry systems at Mars. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2020. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/2142/108498.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McClary M. Assessment of hypersonic separation dynamics for drag modulation entry systems at Mars. [Thesis]. University of Illinois – Urbana-Champaign; 2020. Available from: http://hdl.handle.net/2142/108498
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Utah State University
8.
Stewart, Austin J.
Impact of Parasitic Drag on a Family of Optimal Lift Distributions.
Degree: MS, Mechanical and Aerospace Engineering, 2020, Utah State University
URL: https://digitalcommons.usu.edu/etd/7740
► Minimizing drag is a variational problem, and several minimum induced drag solutions have been found using different design constraints. The elliptic lift distribution is…
(more)
▼ Minimizing
drag is a variational problem, and several minimum induced
drag solutions have been found using different design constraints. The elliptic lift distribution is commonly used to minimize induced
drag, but is only the optimal solution under one set of design constraints. Non-elliptic lift distributions are able to reduce induced
drag, when compared to the elliptic lift distribution, by increasing the wingspan while maintaining a consistent wing–structure weight. However, these non-elliptic lift distributions are only optimal if the effects of viscous
drag are neglected. In this study, numerical tools are used to estimate the total
drag on rectangular wings that are twisted to give both elliptic and non-elliptic lift distributions. It is shown that the optimal lift distribution is described by ���� = 0 for all ��≠ 3 and ��3 = -0.0901 or -0.103 depending on twist type. These optimal lift distributions reduce total
drag by 1.01 or 1.23% respectively when compared to the elliptic lift distribution. These values are compared to lift distributions that minimize only induced
drag, to understand the effects of using a non-elliptic lift distribution on the efficiency of an aircraft and the viability of using non-elliptic lift distributions on aircraft, specifically morphing-wing aircraft.
Advisors/Committee Members: Douglas F. Hunsaker, Thomas H. Fronk, Stephen A. Whitmore, ;.
Subjects/Keywords: Induced Drag; Parasitic Drag; Lift Distribution; Lifting Line Theory; Reducing Drag; Aerospace Engineering
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APA (6th Edition):
Stewart, A. J. (2020). Impact of Parasitic Drag on a Family of Optimal Lift Distributions. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/7740
Chicago Manual of Style (16th Edition):
Stewart, Austin J. “Impact of Parasitic Drag on a Family of Optimal Lift Distributions.” 2020. Masters Thesis, Utah State University. Accessed January 25, 2021.
https://digitalcommons.usu.edu/etd/7740.
MLA Handbook (7th Edition):
Stewart, Austin J. “Impact of Parasitic Drag on a Family of Optimal Lift Distributions.” 2020. Web. 25 Jan 2021.
Vancouver:
Stewart AJ. Impact of Parasitic Drag on a Family of Optimal Lift Distributions. [Internet] [Masters thesis]. Utah State University; 2020. [cited 2021 Jan 25].
Available from: https://digitalcommons.usu.edu/etd/7740.
Council of Science Editors:
Stewart AJ. Impact of Parasitic Drag on a Family of Optimal Lift Distributions. [Masters Thesis]. Utah State University; 2020. Available from: https://digitalcommons.usu.edu/etd/7740
9.
Mesquita, Marina Leitão.
The Haddukan Family in Concert : uma análise do amadrinhamento entre transformistas e drag queens
.
Degree: 2013, Universidade Federal de Pernambuco
URL: http://repositorio.ufpe.br/handle/123456789/12110
► O objetivo deste trabalho consiste em analisar a prática do amadrinhamento entre transformistas e drag queens, buscando compreender os significados atribuídos ao estabelecimento de laços…
(more)
▼ O objetivo deste trabalho consiste em analisar a prática do amadrinhamento entre transformistas e
drag queens, buscando compreender os significados atribuídos ao estabelecimento de laços socioafetivos e às suas experiências concernentes a vivência transgênero. Para compreender tais questões, a metodologia empregada nesta pesquisa consistiu em descrever densamente os fenômenos relativos às experiências e às práticas das integrantes da família investigada, com o intuito de construir uma etnografia do amadrinhamento. Nesse sentido, observei seus processos de montagem corporal, que precedem a realização de espetáculos; compareci aos ensaios preparatórios para suas performances; acompanhei todo o planejamento e preparação de um importante espetáculo e compareci aos seus shows noturnos, atentando para as reações do público. Foram realizadas, também, entrevistas em profundidade semiestruturadas com seis membros do grupo. Foi possível observar que o amadrinhamento se configura em um tipo de relacionamento complexo, que se estabelece entre uma transgênero experiente e uma iniciante. A relação é principiada a partir do repasse do sobrenome e sugere que a preceptora auxilie, conceda apoio e ensine seus conhecimentos sobre as técnicas de montagem e performance. Reciprocamente, à iniciada caberá demonstrar sua gratidão e adotar uma série de exigências estéticas e comportamentais consideradas ideais pelo grupo. Portanto, há uma convergência entre práticas tradicionais e subversivas, no que tange às similitudes com o compadrio e à performance de gênero das artistas trans, que não se adequa a uma matriz heteronormativa, Engendram-se, ainda, relações de poder evidenciadas pela busca do prestígio e pela capacidade de proporcioná-lo através da doação do nome, articulando-se a relações recíprocas de transmissão de saberes e apoio mútuo.
Advisors/Committee Members: Rios, Luís Felipe (advisor).
Subjects/Keywords: Amadrinhamento;
Transformistas;
Drag queens
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APA (6th Edition):
Mesquita, M. L. (2013). The Haddukan Family in Concert : uma análise do amadrinhamento entre transformistas e drag queens
. (Thesis). Universidade Federal de Pernambuco. Retrieved from http://repositorio.ufpe.br/handle/123456789/12110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mesquita, Marina Leitão. “The Haddukan Family in Concert : uma análise do amadrinhamento entre transformistas e drag queens
.” 2013. Thesis, Universidade Federal de Pernambuco. Accessed January 25, 2021.
http://repositorio.ufpe.br/handle/123456789/12110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mesquita, Marina Leitão. “The Haddukan Family in Concert : uma análise do amadrinhamento entre transformistas e drag queens
.” 2013. Web. 25 Jan 2021.
Vancouver:
Mesquita ML. The Haddukan Family in Concert : uma análise do amadrinhamento entre transformistas e drag queens
. [Internet] [Thesis]. Universidade Federal de Pernambuco; 2013. [cited 2021 Jan 25].
Available from: http://repositorio.ufpe.br/handle/123456789/12110.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mesquita ML. The Haddukan Family in Concert : uma análise do amadrinhamento entre transformistas e drag queens
. [Thesis]. Universidade Federal de Pernambuco; 2013. Available from: http://repositorio.ufpe.br/handle/123456789/12110
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cornell University
10.
Tinoco Lopez, Rafael Omar.
An Experimental Investigation Of Drag And The Turbulent Flow Structure In Simulated And Real Aquatic Vegetation.
Degree: PhD, Civil and Environmental Engineering, 2011, Cornell University
URL: http://hdl.handle.net/1813/30714
► The presence of aquatic vegetation in streams generates coherent structures at several length scales, that depend on the properties of both the vegetation and the…
(more)
▼ The presence of aquatic vegetation in streams generates coherent structures at several length scales, that depend on the properties of both the vegetation and the flow. Stem- and leaf-scale wakes are generated as water moves within the canopy and the
drag discontinuity at the top of the plants creates a free shear layerlike flow with coherent vortices that penetrate within the vegetation. Models to estimate velocity, turbulence, mixing rates, dispersion, and residence time within these complex, vegetated flows, require knowledge of the force exerted by the plants, often represented in terms of a
drag coefficient, Cd , and yet its value is often left as a calibration parameter, to match numerical models against laboratory and field data. We present a laboratory, non-intrusive,
drag measuring device. The
drag plate is tested on two well documented cases: uniform flow over a flat plate, and flow around a rigid cylinder. The successful performance of the device proves it suitable for direct measurements of
drag on more complex, single or multiple, rigid or flexible elements, which makes it an ideal device for studies on vegetated flow, natural rough-bed boundary layers, and coastal structures. We use the
drag plate, coupled with quantitative imaging techniques, to capture the velocity field and obstructed frontal areas associated with it, and we generate an extensive data set for flow through submerged and emergent arrays of rigid cylinders, as well as submersed and emergent canopies of live, flexible stems of Eurasian watermilfoil (Myriophyllum spicatum ). Direct measurements of
drag in flow through aquatic vegetation are still rare, since most research groups often estimate its value using a simplified momentum equation, which does not necessarily hold for all scenarios. Our direct approach allows us to compare those estimates against actual measurements, and to identify sources of errors in the estimated values. We use the measured values of
drag in rigid cylinders, to obtain fitting parameters to predict Cd in canopies of live, flexible stems as a function of solid volume fraction, [phi], and a diameter based Reynolds number, Red = Ud/[nu] . For live stems, an effective diameter is proposed as the characteristic length scale, calculated from values of the volumetric frontal area, a (obstructed frontal area per unit volume, [L[-]1 ]), and the canopy density n (number of stems per unit horizontal area [L[-]2 ]), as de = a/n. The predicted values of Cd , and the newly introduced length scale, de , successfully perform at estimating the total
drag, and balancing both momentum and turbulent kinetic energy budgets.
Advisors/Committee Members: Cowen III, Edwin Alfred (chair), Collins, Lance (committee member), Hairston Jr, Nelson George (committee member).
Subjects/Keywords: drag plate; canopy flow; turbulence
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APA (6th Edition):
Tinoco Lopez, R. O. (2011). An Experimental Investigation Of Drag And The Turbulent Flow Structure In Simulated And Real Aquatic Vegetation. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/30714
Chicago Manual of Style (16th Edition):
Tinoco Lopez, Rafael Omar. “An Experimental Investigation Of Drag And The Turbulent Flow Structure In Simulated And Real Aquatic Vegetation.” 2011. Doctoral Dissertation, Cornell University. Accessed January 25, 2021.
http://hdl.handle.net/1813/30714.
MLA Handbook (7th Edition):
Tinoco Lopez, Rafael Omar. “An Experimental Investigation Of Drag And The Turbulent Flow Structure In Simulated And Real Aquatic Vegetation.” 2011. Web. 25 Jan 2021.
Vancouver:
Tinoco Lopez RO. An Experimental Investigation Of Drag And The Turbulent Flow Structure In Simulated And Real Aquatic Vegetation. [Internet] [Doctoral dissertation]. Cornell University; 2011. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/1813/30714.
Council of Science Editors:
Tinoco Lopez RO. An Experimental Investigation Of Drag And The Turbulent Flow Structure In Simulated And Real Aquatic Vegetation. [Doctoral Dissertation]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/30714
Texas A&M University
11.
Gawloski, Nicholas Adam.
Experimental Investigation of Pulsed Electrical Discharge Energy Deposition in Supersonic Flows.
Degree: MS, Mechanical Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/161614
► Energy deposition in the form of a direct current spark discharge in Mach 2.2 flow is experimentally investigated, to measure the conversion efficiency of electrical…
(more)
▼ Energy deposition in the form of a direct current spark discharge in Mach 2.2 flow is experimentally investigated, to measure the conversion efficiency of electrical energy into thermal energy. The energy is impulsively deposited into to the flow. This impulsive deposition occurs much faster than the flow can react, creating a strong blast wave and a high temperature, high pressure region in the flow. The plasma discharge is created between two sharpened tungsten electrodes inclined into the flow, powered by a pulsing high voltage RC circuit. Schlieren imagery was utilized to track the expansion of the blast wave and the expansion of the high temperature, high pressure region created by the spark discharge into a low density region.
To estimate the conversion efficiency of electrical energy into the thermal energy in the flow, a high temperature thermodynamic heating and expansion model was developed to simulate the deposition process. The model consisted of two portions. First, the thermodynamic properties of N2, O2, N, O, Ar, were calculated from the NASA PAC database, valid for temperatures 200-20,000K. A high temperature air mixture was then constructed from the five species assuming chemical equilibrium for temperature from 200-20,000K. Second, a heating and expansion model was developed utilizing the high temperature air properties. The energy deposition was modeled as a constant volume heating process to simulate its impulsive nature. The initial volume of the plasma is calculated from direct imaging of the discharge at delays ranging from 80-120ns. The resulting high temperature, high pressure region is then mixed with varying amounts of ambient air to simulate heat transfer. The high temperature region is then expanded isentropically back to ambient pressure, where the final volume was compared to the experimental Schlieren images to estimate the conversion efficiency.
Three different capacitors were used during experimentation to vary the input electrical energy three orders of magnitude; specifically, the energies were calculated to be: 3.4, 20.8 and 203mJ per pulse. The range of possible efficiencies for the three cases was found to be: 70-90%, 14-30%, and 5-12%. The lower energy case was found to be the most efficient with regards to energy conversion. However, the largest energy case was found to be more effective because it resulted in the region with the highest expanded temperature (4150K) and lowest expanded density (0.017 [kg m^-3]) in its final expanded state.
Advisors/Committee Members: Staack, David (advisor), Kulatilaka, Waruna (committee member), Tichenor, Nathan (committee member).
Subjects/Keywords: Energy Deposition; Drag Reduction
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APA (6th Edition):
Gawloski, N. A. (2017). Experimental Investigation of Pulsed Electrical Discharge Energy Deposition in Supersonic Flows. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161614
Chicago Manual of Style (16th Edition):
Gawloski, Nicholas Adam. “Experimental Investigation of Pulsed Electrical Discharge Energy Deposition in Supersonic Flows.” 2017. Masters Thesis, Texas A&M University. Accessed January 25, 2021.
http://hdl.handle.net/1969.1/161614.
MLA Handbook (7th Edition):
Gawloski, Nicholas Adam. “Experimental Investigation of Pulsed Electrical Discharge Energy Deposition in Supersonic Flows.” 2017. Web. 25 Jan 2021.
Vancouver:
Gawloski NA. Experimental Investigation of Pulsed Electrical Discharge Energy Deposition in Supersonic Flows. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/1969.1/161614.
Council of Science Editors:
Gawloski NA. Experimental Investigation of Pulsed Electrical Discharge Energy Deposition in Supersonic Flows. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161614
Texas A&M University
12.
Rasulo, Marcus P.
Simplified Plastic Limit Analysis of Drag Embedment Anchors in Layered Cohesive Soils.
Degree: MS, Civil Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/157108
► Drag embedment anchors (DEA) are widely used for the temporary, and to a lesser extent the permanent mooring of offshore structures. While they can provide…
(more)
▼ Drag embedment anchors (DEA) are widely used for the temporary, and to a lesser extent the permanent mooring of offshore structures. While they can provide an effective mooring solution, the most commonly used design method, the empirical design charts, leave a high level of uncertainty in prediction of the capacity and trajectory of installed anchors. While this is partially alleviated through the standard of proof loading installed anchors, improved models are needed to help predict the complete capacity and trajectory of the anchors. The presence of layered soils presents an especially complex challenge, which is beyond the scope of most current models. Instead, designers must rely on past experience in the region and designer judgment to estimate if the anchor will be able to penetrate through these challenging soils.
Plastic limit analysis (PLA) allow the incorporation of analytical solutions and geotechnical principles into the design of DEA. In PLA models, the behavior of the anchor is governed by a yield locus, which combined with an incremental kinematic model it can be used to estimate the capacity and movement of the anchor as it advanced through the soil.
The model proposed here is a simplified PLA that assumes a steady state condition as the anchor is embedded. In this state, the anchor load angle or padeye angle is assumed to align with the anchors fluke-shank angle resulting in a condition of zero moment and simplified rotational behavior. The model is then compared to a series of existing design charts, and results from full-scale field installations. To address the issue of layered soils the framework of the model is then expanded to allow for the inclusion of stiff layers of clays. The stiff layers are analyzed through the use of area transformations and multipliers equivalent to the area of the anchor embedded into the layer. As no non-proprietary data is available to validate the model at this time, the model is then simulated through a number complex configurations to see how it captures known behavior.
Advisors/Committee Members: Aubeny, Charles P (advisor), Sanchez, Marcelo (committee member), Schubert, Jerome (committee member).
Subjects/Keywords: drag anchors; offshore anchors; geotechnical
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APA (6th Edition):
Rasulo, M. P. (2016). Simplified Plastic Limit Analysis of Drag Embedment Anchors in Layered Cohesive Soils. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/157108
Chicago Manual of Style (16th Edition):
Rasulo, Marcus P. “Simplified Plastic Limit Analysis of Drag Embedment Anchors in Layered Cohesive Soils.” 2016. Masters Thesis, Texas A&M University. Accessed January 25, 2021.
http://hdl.handle.net/1969.1/157108.
MLA Handbook (7th Edition):
Rasulo, Marcus P. “Simplified Plastic Limit Analysis of Drag Embedment Anchors in Layered Cohesive Soils.” 2016. Web. 25 Jan 2021.
Vancouver:
Rasulo MP. Simplified Plastic Limit Analysis of Drag Embedment Anchors in Layered Cohesive Soils. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/1969.1/157108.
Council of Science Editors:
Rasulo MP. Simplified Plastic Limit Analysis of Drag Embedment Anchors in Layered Cohesive Soils. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/157108
Texas Tech University
13.
Watkins, Scott.
Hydrodynamics of a biologically inspired surface coating.
Degree: MSin Mechanical Engineering, Mechanical Engineering, 2018, Texas Tech University
URL: http://hdl.handle.net/2346/74401
► The determination of parasitic drag is of vital importance to the development of more effective flow control. This work uses three experiments to evaluate drag.…
(more)
▼ The determination of parasitic
drag is of vital importance to the development of more effective flow control. This work uses three experiments to evaluate
drag. Each of these experiments utilize a different method to identify the effect of
drag on a body moving relative to a fluid. Each experiment was conducted with the intent of testing a biologically inspired micro-fibular surface coating. This coating is a simplification of shark denticles which are known to have
drag reducing properties. While most of the experiments failed to produce results that either confirm or deny these properties each experiment provides insight into the challenges faced in the measurement of
drag. These results point to the necessity of experimental simplification and iterative experimental design to reduce the possibilities of error. The experiment that did produce useable results on the effectiveness of the bio-inspired micro-fibular surface coating showed that the surface increases the flow velocity present along a wall diverging from a passing flow. This increase in velocity is an indicator that flow separation should be expected and as a result a reduction in parasitic
drag.
Advisors/Committee Members: Castillo, Luciano (committee member), Curet, Oscar (committee member), Snoeyink, Craig (committee member), Kumar, Golden (committee member), Aksak, Burak (Committee Chair).
Subjects/Keywords: drag; bio-inspired surface
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APA (6th Edition):
Watkins, S. (2018). Hydrodynamics of a biologically inspired surface coating. (Masters Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/74401
Chicago Manual of Style (16th Edition):
Watkins, Scott. “Hydrodynamics of a biologically inspired surface coating.” 2018. Masters Thesis, Texas Tech University. Accessed January 25, 2021.
http://hdl.handle.net/2346/74401.
MLA Handbook (7th Edition):
Watkins, Scott. “Hydrodynamics of a biologically inspired surface coating.” 2018. Web. 25 Jan 2021.
Vancouver:
Watkins S. Hydrodynamics of a biologically inspired surface coating. [Internet] [Masters thesis]. Texas Tech University; 2018. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/2346/74401.
Council of Science Editors:
Watkins S. Hydrodynamics of a biologically inspired surface coating. [Masters Thesis]. Texas Tech University; 2018. Available from: http://hdl.handle.net/2346/74401
14.
Silvestri, Anton.
The attenuation of sweep events within the turbulent boundary layer over a flat plate using a micro-cavity array.
Degree: 2018, University of Adelaide
URL: http://hdl.handle.net/2440/118055
► For most aeronautical applications skin friction drag is a significant issue for efficient operation. It is estimated that 49% of the total drag an aircraft…
(more)
▼ For most aeronautical applications skin friction
drag is a significant issue for efficient operation. It is estimated that 49% of the total
drag an aircraft experiences is due to skin friction
drag and a small reduction of 5% would currently result in an annual saving of $3.3 billion US dollars. The large Reynolds number at which aerospace applications typically operate results in a turbulent boundary layer, which causes a large increase in shear stresses and a subsequent increase in skin friction
drag. The key culprits for the large shear stresses are the turbulent boundary layer structures that form once the boundary layer transitions from the initial laminar state, the most influential of which are the coherent structures. These structures pump fluid into (sweep) and away (ejection) from the near wall region and generate the shear stresses. Hence the aim of this research is to manipulate the turbulent boundary layer to reduce the effect of the aforementioned coherent structures. Specific attention has been applied to the passive application of a micro-cavity array as a potential control technique to attenuate the coherent structures. The micro-cavity array consists of a cavity arranged flush with the surface, underneath of which is a backing cavity similar to the design of a Helmholtz resonator. As a passive control technique, this device aims to have the advantages of an easy implementation and the absence of an external power source, with targeted control of the coherent structures commonly achieved by active systems. The micro-cavity array aims to capture and dampen the sweep events, therefore reducing the strength of both the ejection and sweep events due to their high dependence on one another. As such the present work assesses the ability of an array of micro-cavities to reduce the turbulent properties of a fully developed boundary layer. Previous results from the flow excited Helmholtz resonator and a two-dimensional square cavity on a flat plate have confirmed the potential of the micro-cavity array. Both techniques achieved successful control of the boundary layer and attenuation of the coherent structures. However these applications had limitations at higher Reynolds numbers and as a result a smaller device such as the micro-cavity is proposed and forms the basis of this thesis. Being of smaller size, the shear layer is hypothesised not to break apart while traversing the small orifices of the micro-cavity, which occurs for the larger flow excited Helmholtz resonator and results in an adverse pressure gradient and an undesirable increase in the disturbances and viscous
drag in the boundary layer. To investigate the potential of the proposed micro-cavity array, the device has been thoroughly examined experimentally at a range of Reynolds numbers (1195 < Reθ < 3771). Experiments were predominately focused on identifying the potential of the micro-cavity, whilst evaluating the impact of the orifice distribution along the cavity array and the effect of other geometric parameters, including the length of the…
Advisors/Committee Members: Arjomandi, Maziar (advisor), Chin, Rey (advisor), Cazzolato, Benjamin (advisor), Zander, Anthony (advisor), School of Mechanical Engineering (school).
Subjects/Keywords: Fluid mechanics; turbulence; drag reduction
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APA (6th Edition):
Silvestri, A. (2018). The attenuation of sweep events within the turbulent boundary layer over a flat plate using a micro-cavity array. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/118055
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Silvestri, Anton. “The attenuation of sweep events within the turbulent boundary layer over a flat plate using a micro-cavity array.” 2018. Thesis, University of Adelaide. Accessed January 25, 2021.
http://hdl.handle.net/2440/118055.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Silvestri, Anton. “The attenuation of sweep events within the turbulent boundary layer over a flat plate using a micro-cavity array.” 2018. Web. 25 Jan 2021.
Vancouver:
Silvestri A. The attenuation of sweep events within the turbulent boundary layer over a flat plate using a micro-cavity array. [Internet] [Thesis]. University of Adelaide; 2018. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/2440/118055.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Silvestri A. The attenuation of sweep events within the turbulent boundary layer over a flat plate using a micro-cavity array. [Thesis]. University of Adelaide; 2018. Available from: http://hdl.handle.net/2440/118055
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
McMaster University
15.
Yu, Liu.
Experimental Determination of the Four Principal Drag Coefficients of Magnetospirillum magneticum AMB-1 cells.
Degree: MASc, 2020, McMaster University
URL: http://hdl.handle.net/11375/25734
► Magnetotactic bacteria (MTB) possess organelles called magnetosomes which contain magnetite (Fe_3O_4) or greigite (Fe_3S_4) nanocrystals. These particles generate a magnetic moment allowing the use of…
(more)
▼ Magnetotactic bacteria (MTB) possess organelles called magnetosomes which contain magnetite (Fe_3O_4) or greigite (Fe_3S_4) nanocrystals. These particles generate a magnetic moment allowing the use of external magnetic fields to control the cell orientation. MTB use this magnetic moment to reach environments with optimal oxygen concentration, a process called magnetotaxis. There are many possible technological applications for MTB, for example, they have been used as nanorobots to push beads and they can be used to remove heavy metals and radionuclides from waste water. In order to fully understand the motion of these micron-size organisms, which takes place at very low Reynolds number where friction dominates over inertia, we set out to measure their drag coefficients. As a starting point, we used a well-studied species of MTB with a corkscrew shape, Magnetospirillum magneticum AMB-1. Simulations were done to find the best external magnetic field strength at which to observe their diffusion. We then imaged non-motile cells placed in these preferred uniform magnetic fields and used automated image analysis to determine the position and orientation of the cells in each frame. This allowed calculating orientation correlation functions and mean-squared displacements, from which rotational and translational diffusion coefficients were obtained for each individual cell. We observed that the four principal drag coefficients of these cells greatly vary as a function of cell length as predicted for cylindrical or elliptical objects with comparable radius. However, we also detecting a coupling between the rotation around and translation along the long axis of the cell only observed for chiral objects. We were able for the first time to experimentally fully characterize the friction matrix for a micron-size elongated chiral object.
Continuing our work on MTB, to study live cells for long periods of time, we looked to confine them in PDMS nanowells, but found that MTB were not growing well in this environment. We then turned to a device, which incorporated a PDMS microchannel to provide continuous nutrients and a gel membrane to enable cellular growth into a 2D monolayer. Hopefully, this experimental setup combined with time-lapse microscopy can in the future be used to observe cell growth and cell division, and further to determine whether the magnetosome of the mother is passed on equally between daughter cells.
Thesis
Master of Applied Science (MASc)
Advisors/Committee Members: Fradin, Cécile, Biomedical Engineering.
Subjects/Keywords: Magnetotactic bacteria; Principal drag coefficients
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APA (6th Edition):
Yu, L. (2020). Experimental Determination of the Four Principal Drag Coefficients of Magnetospirillum magneticum AMB-1 cells. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/25734
Chicago Manual of Style (16th Edition):
Yu, Liu. “Experimental Determination of the Four Principal Drag Coefficients of Magnetospirillum magneticum AMB-1 cells.” 2020. Masters Thesis, McMaster University. Accessed January 25, 2021.
http://hdl.handle.net/11375/25734.
MLA Handbook (7th Edition):
Yu, Liu. “Experimental Determination of the Four Principal Drag Coefficients of Magnetospirillum magneticum AMB-1 cells.” 2020. Web. 25 Jan 2021.
Vancouver:
Yu L. Experimental Determination of the Four Principal Drag Coefficients of Magnetospirillum magneticum AMB-1 cells. [Internet] [Masters thesis]. McMaster University; 2020. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/11375/25734.
Council of Science Editors:
Yu L. Experimental Determination of the Four Principal Drag Coefficients of Magnetospirillum magneticum AMB-1 cells. [Masters Thesis]. McMaster University; 2020. Available from: http://hdl.handle.net/11375/25734
Delft University of Technology
16.
Veldhuizen, R. (author).
Development of a fast aerodynamic tool using meta-modeling techniques.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8741189f-1006-4e79-89d8-8c7bc11d6baa
► There is a need for a wave drag method that combines the speed of handbook methods with the accuracy of computational methods. Especially determining the…
(more)
▼ There is a need for a wave drag method that combines the speed of handbook methods with the accuracy of computational methods. Especially determining the onset of wave drag as well as the initial drag rise is important in initial design stages. Meta-models allow this by capturing the trends present in previously computed data, providing an accurate and fast representation. In this report, it is investigated what gains can be achieved by applying the meta-modeling method GT-Approx to the aerodynamic tool MSES. The total drag calculated by MSES for a super critical airfoil was verified using wind tunnel experiments. It was found that aerodynamic characteristics and pressure distributions are accurate up until M = 0.76. GT-Approx was critically evaluated. It was found that the general prediction quality was good, but that the error increased substantially for complex cases, such as high M or high cl This issue is solved by increasing the resolution of the input data. By optimizing the resolution for the different input variables the average prediction error decreased by 30% for cdv and 70% for cdw. Especially for the difficult cases, the accuracy greatly improved. Two A320 variants are evaluated using GT-Approx and a direct application of MSES. The performance of GTApprox is good. An average difference of 0.21 drag counts between MSES and GT-Approx was achieved, with an in-calculation computation time of 5.13?10??s per calculation instead of 5.58s using a direct application of MSES. GT-Approx is extended to a quasi-3Dmethod, using the simple sweep method. This quasi-3D method is used to calculate the value of CDw for two test cases. The calculated values of CDw are compared with CFD data. It was found that the region of validity of the quasi-3D method is highly limited. Up until 60% of the wing, root and tip effects, fuselage effects and engine installation effects render any comparison useless. Beyond this value the first test case showed no correlation, whereas the second showed reasonable accuracy. Due to lack of more 3D CFD data, no clear explanation for the difference was found. In general it is concluded that the combination of an aerodynamic tool with a meta-model is able to combine low computation times with high accuracy, but only if the aerodynamic model is accurate.
Flight Performance & Propulsion
Aerospace Engineering
Advisors/Committee Members: Vos, R. (mentor).
Subjects/Keywords: wave drag; meta-modeling
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APA (6th Edition):
Veldhuizen, R. (. (2015). Development of a fast aerodynamic tool using meta-modeling techniques. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8741189f-1006-4e79-89d8-8c7bc11d6baa
Chicago Manual of Style (16th Edition):
Veldhuizen, R (author). “Development of a fast aerodynamic tool using meta-modeling techniques.” 2015. Masters Thesis, Delft University of Technology. Accessed January 25, 2021.
http://resolver.tudelft.nl/uuid:8741189f-1006-4e79-89d8-8c7bc11d6baa.
MLA Handbook (7th Edition):
Veldhuizen, R (author). “Development of a fast aerodynamic tool using meta-modeling techniques.” 2015. Web. 25 Jan 2021.
Vancouver:
Veldhuizen R(. Development of a fast aerodynamic tool using meta-modeling techniques. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 25].
Available from: http://resolver.tudelft.nl/uuid:8741189f-1006-4e79-89d8-8c7bc11d6baa.
Council of Science Editors:
Veldhuizen R(. Development of a fast aerodynamic tool using meta-modeling techniques. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:8741189f-1006-4e79-89d8-8c7bc11d6baa
University of Florida
17.
Omar, Sanny R.
A Drag Device and Control Algorithm for Spacecraft Attitude Stabilization and De-Orbit Point Targeting Using Aerodynamic Drag.
Degree: PhD, Aerospace Engineering - Mechanical and Aerospace Engineering, 2019, University of Florida
URL: https://ufdc.ufl.edu/UFE0055992
► The ability to re-enter the atmosphere at a desired location is important for spacecraft containing components that may survive re-entry. This work discusses the use…
(more)
▼ The ability to re-enter the atmosphere at a desired location is important for spacecraft containing components that may survive re-entry. This work discusses the use of solely aerodynamic
drag forces to perform this targeting, which is especially useful for smaller spacecraft that do not contain thrusters capable of facilitating a controlled re-entry. It is shown that by varying the ballistic coefficient of a spacecraft over time, any desired longitude and latitude can be targeted provided that the maneuvering begins early enough and the latitude is less than the inclination of the orbit. An analytical solution based on perturbations from a numerically propagated trajectory is developed to estimate the ballistic coefficient profile necessary to reach a given target point assuming small deviations from the numerical trajectory. An iterative process whereby analytical solutions are tested and refined can be utilized to determine the ballistic coefficient necessary for re-entry point targeting. Monte Carlo simulations are conducted to verify the algorithm performance. Desired de-orbit points were reached with an error under 106 km in all tested scenarios. Guidance trajectory tracking methods based on feedback control are also investigated to ensure that the spacecraft has a means of following the guidance trajectory in the face of uncertainties in the
drag force estimate. The design of a physical
drag device capable of modulating the ballistic coefficient of a host spacecraft is also discussed along with the design of a CubeSat intended to test the
drag device. ( en )
Advisors/Committee Members: Bevilacqua,Riccardo (committee chair), Conklin,John (committee member), Matcheva,Katia Ivandva (committee member), Orr,Jeb (committee member).
Subjects/Keywords: control – cubesat – drag – hardware – reentry
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APA (6th Edition):
Omar, S. R. (2019). A Drag Device and Control Algorithm for Spacecraft Attitude Stabilization and De-Orbit Point Targeting Using Aerodynamic Drag. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0055992
Chicago Manual of Style (16th Edition):
Omar, Sanny R. “A Drag Device and Control Algorithm for Spacecraft Attitude Stabilization and De-Orbit Point Targeting Using Aerodynamic Drag.” 2019. Doctoral Dissertation, University of Florida. Accessed January 25, 2021.
https://ufdc.ufl.edu/UFE0055992.
MLA Handbook (7th Edition):
Omar, Sanny R. “A Drag Device and Control Algorithm for Spacecraft Attitude Stabilization and De-Orbit Point Targeting Using Aerodynamic Drag.” 2019. Web. 25 Jan 2021.
Vancouver:
Omar SR. A Drag Device and Control Algorithm for Spacecraft Attitude Stabilization and De-Orbit Point Targeting Using Aerodynamic Drag. [Internet] [Doctoral dissertation]. University of Florida; 2019. [cited 2021 Jan 25].
Available from: https://ufdc.ufl.edu/UFE0055992.
Council of Science Editors:
Omar SR. A Drag Device and Control Algorithm for Spacecraft Attitude Stabilization and De-Orbit Point Targeting Using Aerodynamic Drag. [Doctoral Dissertation]. University of Florida; 2019. Available from: https://ufdc.ufl.edu/UFE0055992
Washington University in St. Louis
18.
Du, Pan.
Numerical Drag Prediction of NASA Common Research Models Using Different Turbulence Models.
Degree: ME, Mechanical Engineering & Materials Science, 2017, Washington University in St. Louis
URL: https://openscholarship.wustl.edu/eng_etds/262
► The goal of this research is to perform 3D turbulence flow simulations to predict the drag of Wing-body-tail (WBT) and Wing-body-nacelle-Pylon (WBNP) aircraft configurations…
(more)
▼ The goal of this research is to perform 3D turbulence flow simulations to predict the
drag of Wing-body-tail (WBT) and Wing-body-nacelle-Pylon (WBNP) aircraft configurations from NASA Common Research Models. These configurations are also part of the 4th and 6th AIAA
Drag Prediction Workshops in which CFD modelers have participated worldwide. The computations are performed using CFD solver ANSYS FLUENT. The compressible Reynolds-Averaged Navier-Stokes (RANS) equations are solved using two turbulence models – the Spalart-Allmaras (SA) and SST k-ω.
Drag polar and
drag rise curves are obtained by performing computations at different angles of attack at a constant Mach number. Pressure distributions and flow separation analysis are presented at different angles of attack. Comparison of computational results for WBT and WBNP models is made with the experimental data using the two turbulence models; good agreements is obtained. For WBNP, an aero-elastically deformed model of the wing is also considered at an angle of attack of 2.75°; the computations again are in reasonable agreement with the experiment. The computed WBNP results are compared with WB results for the
drag increment study.
Advisors/Committee Members: Ramesh Agarwal, Ramesh Agarwal, Chair
David Peters
Swami Karunamoorthy.
Subjects/Keywords: Numerical; CFD; Drag; Transonic; Engineering
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APA (6th Edition):
Du, P. (2017). Numerical Drag Prediction of NASA Common Research Models Using Different Turbulence Models. (Thesis). Washington University in St. Louis. Retrieved from https://openscholarship.wustl.edu/eng_etds/262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Du, Pan. “Numerical Drag Prediction of NASA Common Research Models Using Different Turbulence Models.” 2017. Thesis, Washington University in St. Louis. Accessed January 25, 2021.
https://openscholarship.wustl.edu/eng_etds/262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Du, Pan. “Numerical Drag Prediction of NASA Common Research Models Using Different Turbulence Models.” 2017. Web. 25 Jan 2021.
Vancouver:
Du P. Numerical Drag Prediction of NASA Common Research Models Using Different Turbulence Models. [Internet] [Thesis]. Washington University in St. Louis; 2017. [cited 2021 Jan 25].
Available from: https://openscholarship.wustl.edu/eng_etds/262.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Du P. Numerical Drag Prediction of NASA Common Research Models Using Different Turbulence Models. [Thesis]. Washington University in St. Louis; 2017. Available from: https://openscholarship.wustl.edu/eng_etds/262
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
19.
Stancil, Robert Thomas.
An investigation of pressure drag in transonic flow by the method of hydraulic analogy.
Degree: MS, Aeronautical Engineering, 1954, Georgia Tech
URL: http://hdl.handle.net/1853/12080
Subjects/Keywords: Drag (Aerodynamics)
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APA (6th Edition):
Stancil, R. T. (1954). An investigation of pressure drag in transonic flow by the method of hydraulic analogy. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/12080
Chicago Manual of Style (16th Edition):
Stancil, Robert Thomas. “An investigation of pressure drag in transonic flow by the method of hydraulic analogy.” 1954. Masters Thesis, Georgia Tech. Accessed January 25, 2021.
http://hdl.handle.net/1853/12080.
MLA Handbook (7th Edition):
Stancil, Robert Thomas. “An investigation of pressure drag in transonic flow by the method of hydraulic analogy.” 1954. Web. 25 Jan 2021.
Vancouver:
Stancil RT. An investigation of pressure drag in transonic flow by the method of hydraulic analogy. [Internet] [Masters thesis]. Georgia Tech; 1954. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/1853/12080.
Council of Science Editors:
Stancil RT. An investigation of pressure drag in transonic flow by the method of hydraulic analogy. [Masters Thesis]. Georgia Tech; 1954. Available from: http://hdl.handle.net/1853/12080
Georgia Tech
20.
McAllister, Jack Donald.
An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy.
Degree: MS, Aeronautical Engineering, 1954, Georgia Tech
URL: http://hdl.handle.net/1853/12146
Subjects/Keywords: Drag (Aerodynamics)
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Export
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Manager
APA (6th Edition):
McAllister, J. D. (1954). An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/12146
Chicago Manual of Style (16th Edition):
McAllister, Jack Donald. “An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy.” 1954. Masters Thesis, Georgia Tech. Accessed January 25, 2021.
http://hdl.handle.net/1853/12146.
MLA Handbook (7th Edition):
McAllister, Jack Donald. “An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy.” 1954. Web. 25 Jan 2021.
Vancouver:
McAllister JD. An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy. [Internet] [Masters thesis]. Georgia Tech; 1954. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/1853/12146.
Council of Science Editors:
McAllister JD. An investigation of base pressure ratios of blunt based-bodies by the method of hydraulic analogy. [Masters Thesis]. Georgia Tech; 1954. Available from: http://hdl.handle.net/1853/12146
21.
Huang, Weicong.
Drag Reduction in Pipeline by Polymer-Surfactant and Polymer-Polymer Mixtures.
Degree: 2015, University of Waterloo
URL: http://hdl.handle.net/10012/9853
► Extensive researches have been conducted to investigate into the drag reduction behavior of the polymer-surfactant mixture and the polymer-polymer mixture. The drag reduction effect of…
(more)
▼ Extensive researches have been conducted to investigate into the drag reduction behavior of the polymer-surfactant mixture and the polymer-polymer mixture. The drag reduction effect of PAM (polyacrylamide), PEO (polyethylene oxide) and CMC (carboxymethyl cellulose) has already been studied respectively. However, the drag reduction effects of the combination of these polymers have not been studied before. It is interesting to investigate into these combinations because the synergy between different polymers can enhance the drag reduction effect under the right condition.
SDS (sodium dodecyl sulfate) is a surfactant widely used in many commercially available detergents. When dissolved in water and circulated in the flow loop, the drag reduction effect of SDS has also been observed. Therefore, the combination of PAM and SDS is also worth exploring. The synergy between the polymer and the surfactant may strengthen the drag reduction effect.
In this thesis, the drag reduction effects are investigated for the following combinations: the PAM-SDS system, the PAM-CMC system and the PEO-CMC system. The mixed solutions are circulated in the flow loop, where the pressure drop over a certain distance and the flow rate are recorded in order to plot the friction factor against the Reynolds number. In addition, the viscosity, conductivity and surface tension of the mixed solutions are studied at bench-scale to look for the synergy in the mixed system.
Subjects/Keywords: Drag reduction polymer surfactant mixture
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APA (6th Edition):
Huang, W. (2015). Drag Reduction in Pipeline by Polymer-Surfactant and Polymer-Polymer Mixtures. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/9853
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Huang, Weicong. “Drag Reduction in Pipeline by Polymer-Surfactant and Polymer-Polymer Mixtures.” 2015. Thesis, University of Waterloo. Accessed January 25, 2021.
http://hdl.handle.net/10012/9853.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Huang, Weicong. “Drag Reduction in Pipeline by Polymer-Surfactant and Polymer-Polymer Mixtures.” 2015. Web. 25 Jan 2021.
Vancouver:
Huang W. Drag Reduction in Pipeline by Polymer-Surfactant and Polymer-Polymer Mixtures. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/10012/9853.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Huang W. Drag Reduction in Pipeline by Polymer-Surfactant and Polymer-Polymer Mixtures. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/9853
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Sydney
22.
Hazrati, Pendar.
Active drag of front crawl swimmers: estimation, measurement and analysis
.
Degree: 2016, University of Sydney
URL: http://hdl.handle.net/2123/15774
► Researchers’ methods of estimating water’s resistance (drag) to a swimmer include the Assisted Towing Method (ATM) with fluctuating speed. This thesis aimed to assess the…
(more)
▼ Researchers’ methods of estimating water’s resistance (drag) to a swimmer include the Assisted Towing Method (ATM) with fluctuating speed. This thesis aimed to assess the ATM method’s reliability with fluctuating speed, using it to examine the estimation of active drag’s validity. Chapter 3 investigated its reliability using Intra-class Correlation Coefficients (ICC) within-subject for one day and over two other days. The ICCs within-subject were moderately reliable for Day 1 (0.82) and Day 2 (0.85) but there was high reliability (0.92) when averaged active drag values were used. In chapter 4, mean active drag values resulted from two assisted and resisted methods compared to see if they measured the same values for active drag: both methods showed large differences in active drag with some swimmers. The ATM method calculates active drag from a function of three measured variables (swim speed, tow speed belt force) with two assumptions about power output between trials and the square relationship between drag force and swim speed. In chapter 5, each variable’s uncertainty and its contribution to active drag value were calculated. Results showed that a power change of 7.5% between trials meant about 30% error in calculated drag, showing that uncertainty in a range exponent of 1.8–2.6 would mean about 5% error in active drag value. The measured variables’ contributions to active drag were approximately 6–7% error for free and tow swim speeds and 2–3% error for belt force. Previous ATM method studies have presented an active drag profile of front crawl swimmers calculated from instantaneous values of three variables: free swim speed, tow speed and tow force. In chapter 6, comparison of the free swim profile with the two methods’ tow speed profiles, to see if these fluctuations are as large as in free swimming, showed the difference between maximum and minimum speeds was approximately 36%, 25.3% and 12.7% for the free, assisted and resisted swimming respectively.
Subjects/Keywords: Active Drag;
Measurement;
Analysis;
Swimming
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Manager
APA (6th Edition):
Hazrati, P. (2016). Active drag of front crawl swimmers: estimation, measurement and analysis
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/15774
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hazrati, Pendar. “Active drag of front crawl swimmers: estimation, measurement and analysis
.” 2016. Thesis, University of Sydney. Accessed January 25, 2021.
http://hdl.handle.net/2123/15774.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hazrati, Pendar. “Active drag of front crawl swimmers: estimation, measurement and analysis
.” 2016. Web. 25 Jan 2021.
Vancouver:
Hazrati P. Active drag of front crawl swimmers: estimation, measurement and analysis
. [Internet] [Thesis]. University of Sydney; 2016. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/2123/15774.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hazrati P. Active drag of front crawl swimmers: estimation, measurement and analysis
. [Thesis]. University of Sydney; 2016. Available from: http://hdl.handle.net/2123/15774
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
23.
Smith, Brenton.
A Comprehensive Examination of Low Earth Orbit Aerodynamic Accelerations for Satellite Formation Control.
Degree: Engineering & Information Technology, 2019, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/61751
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57422/SOURCE02?view=true
► The mass, volume and launch constraints of CubeSats has resulted in operators resorting to the drag component of aerodynamic acceleration to manoeuvre formation flying satellites.In…
(more)
▼ The mass, volume and launch constraints of CubeSats has resulted in operators resorting to the
drag component of aerodynamic acceleration to manoeuvre formation flying satellites.In addition to the
drag component of the aerodynamic acceleration, this work applies two overlooked aspects of orbital aerodynamics to satellite formation control: the components of aerodynamic acceleration that are orthogonal to
drag (lift and side slip) and the aerodynamic acceleration caused by a charged spacecraft as it exchanges momentum with ions and electrons in the ionosphere (ionospheric
drag).By considering the lift and
drag components of the relative aerodynamic acceleration vector generated at intermediate angles of attack of a main lifting surface, it was discovered that a difference in the lift (differential lift) and
drag (differential
drag) component of the relative aerodynamic vector could be achieved at the same time.Differential
drag and differential lift components of the relative aerodynamic acceleration have only ever been applied in isolation to satellite formation control.The simultaneous application of differential lift and differential
drag components of the relative aerodynamic acceleration between two formation flying spacecraft can actuate motion along all three translational axes simultaneously, which simulations within this work indicate can improve the speed of rendezvous by approximately 90% and reduce the loss of specific mechanical energy for the same rendezvous manoeuvre by 95% when compared to the equivalent manoeuvre performed when the differential
drag and differential lift component of the relative aerodynamic acceleration vector are applied in isolation to actuate the spacecraft along the three translational axes sequentially, as is currently considered.For a charged and neutral sphere with identical shape and position within the same low Earth orbit, the differential
drag, caused only by the ionospheric
drag acting on the charged sphere (the neutral
drag on the charged and neutral spheres cancel), is sufficient to actuate changes in semi-major axis acceptable for formation control depending on the ionospheric density; and area, area-to-mass ratio, and surface potential of the spheres. However, the magnitude of differential
drag caused by ionospheric
drag in the most ideal case tested was equivalent to the differential
drag between two neutral spheres with an 18% difference in cross-sectional area.Therefore, achieving differential
drag via a difference in ionospheric
drag is an inferior mechanism for actuating satellite formation manoeuvres compared to differential
drag caused by neutral
drag.
Advisors/Committee Members: Brown, Melrose, UNSW Canberra, UNSW, Boyce, Russell, UNSW Canberra, UNSW, Garratt, Matthew, UNSW Canberra, UNSW.
Subjects/Keywords: CubeSat; Formation Flying; Differential Drag
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APA (6th Edition):
Smith, B. (2019). A Comprehensive Examination of Low Earth Orbit Aerodynamic Accelerations for Satellite Formation Control. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/61751 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57422/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Smith, Brenton. “A Comprehensive Examination of Low Earth Orbit Aerodynamic Accelerations for Satellite Formation Control.” 2019. Doctoral Dissertation, University of New South Wales. Accessed January 25, 2021.
http://handle.unsw.edu.au/1959.4/61751 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57422/SOURCE02?view=true.
MLA Handbook (7th Edition):
Smith, Brenton. “A Comprehensive Examination of Low Earth Orbit Aerodynamic Accelerations for Satellite Formation Control.” 2019. Web. 25 Jan 2021.
Vancouver:
Smith B. A Comprehensive Examination of Low Earth Orbit Aerodynamic Accelerations for Satellite Formation Control. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2021 Jan 25].
Available from: http://handle.unsw.edu.au/1959.4/61751 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57422/SOURCE02?view=true.
Council of Science Editors:
Smith B. A Comprehensive Examination of Low Earth Orbit Aerodynamic Accelerations for Satellite Formation Control. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/61751 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:57422/SOURCE02?view=true
The Ohio State University
24.
Carpenter, Charles Nelson.
Drag reduction visual study.
Degree: PhD, Graduate School, 1973, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486747191397894
Subjects/Keywords: Engineering; Drag
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Manager
APA (6th Edition):
Carpenter, C. N. (1973). Drag reduction visual study. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486747191397894
Chicago Manual of Style (16th Edition):
Carpenter, Charles Nelson. “Drag reduction visual study.” 1973. Doctoral Dissertation, The Ohio State University. Accessed January 25, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1486747191397894.
MLA Handbook (7th Edition):
Carpenter, Charles Nelson. “Drag reduction visual study.” 1973. Web. 25 Jan 2021.
Vancouver:
Carpenter CN. Drag reduction visual study. [Internet] [Doctoral dissertation]. The Ohio State University; 1973. [cited 2021 Jan 25].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486747191397894.
Council of Science Editors:
Carpenter CN. Drag reduction visual study. [Doctoral Dissertation]. The Ohio State University; 1973. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486747191397894
Oklahoma State University
25.
Kulkarni, Sanket.
Predicting Ion Exchange Bead Rise during Backwash Flow.
Degree: School of Chemical Engineering, 2012, Oklahoma State University
URL: http://hdl.handle.net/11244/9641
► Separation of cationic and anionic resin is an important step in mixed bed ion exchange operation. Prior to regeneration good separation of the two resins…
(more)
▼ Separation of cationic and anionic resin is an important step in mixed bed ion exchange operation. Prior to regeneration good separation of the two resins reduces cross contamination. Inefficient separation of the resins also leads to loss of capacity. By accurately predicting the height of the resin interface, the separation of the resins can be improved. This study proposes a bed expansion model that accurately predicts the bed expansion height.
Advisors/Committee Members: Foutch, Gary Lynn (advisor), Madihally, Sundar (committee member), Ramsey, Josh (committee member).
Subjects/Keywords: drag coefficient; fluidization; ion exchange
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APA (6th Edition):
Kulkarni, S. (2012). Predicting Ion Exchange Bead Rise during Backwash Flow. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9641
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kulkarni, Sanket. “Predicting Ion Exchange Bead Rise during Backwash Flow.” 2012. Thesis, Oklahoma State University. Accessed January 25, 2021.
http://hdl.handle.net/11244/9641.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kulkarni, Sanket. “Predicting Ion Exchange Bead Rise during Backwash Flow.” 2012. Web. 25 Jan 2021.
Vancouver:
Kulkarni S. Predicting Ion Exchange Bead Rise during Backwash Flow. [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/11244/9641.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kulkarni S. Predicting Ion Exchange Bead Rise during Backwash Flow. [Thesis]. Oklahoma State University; 2012. Available from: http://hdl.handle.net/11244/9641
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
RMIT University
26.
Wong, B.
The enhancement of atmospheric drag prediction using space-tracking data for accurate debris surveillance and collision warning.
Degree: 2012, RMIT University
URL: http://researchbank.rmit.edu.au/view/rmit:160226
► This research investigates the temporal variation of the coefficient of atmospheric drag value (CD) and its subsequent effects on orbit prediction. Atmospheric drag is one…
(more)
▼ This research investigates the temporal variation of the coefficient of atmospheric drag value (CD) and its subsequent effects on orbit prediction. Atmospheric drag is one of the most dominant forces exerted to space objects at altitudes below approximately 1500 km in the Low Earth Orbit (LEO). Its accuracy is governed primarily by the accuracy of the atmospheric mass density modelling, area-to-mass ratio and the CD value. Traditionally, the tracking of space objects is conducted using the radar method and the optical approach. Recently, Satellite Laser Ranging (SLR) technique is being developed to track space debris. However, it is still limited by the most fundamental problem of unable to accurately predict the motion of space objects, which is largely due to the insufficient accuracy of determining the atmospheric drag. The focus of this research is to investigate viable approaches to enhance the prediction of the CD value for higher accuracy prediction of orbits of space objects. The conventional CD value prediction approaches, i.e., the fix 2.2 CD and variable CD methods, are investigated. The more accurate variable CD approach has presented a repetitive cyclical change in the estimated CD values over the study period from 2004 to 2006 using Stella as the experimental satellite. This suggests a different scenario to the fixed value of 2.2 approach commonly adopted by the space industry. Due to the repetitive cycle of the CD variations, Fourier series are selected to fit the estimated CD values over the study period. The fitting function is extrapolated to predict CD values for 2007, which are subsequently applied to the subsequent orbit prediction process using the fix CD value method. This implies that the predicted CD values are pre-determined prior to the orbit determination and prediction, similar to the fix 2.2 method that adopts a fixed value of 2.2. The orbit prediction results using the fitting function have demonstrated significant improvements over the traditional fixed 2.2 CD value method. The fitting function approach is also verified by performing the same experiments to satellites Starlette and ERS-2, where noticeable improvements in the orbit predictions are also achieved. For orbit prediction, the fixed value method has shown to be more computationally efficient since approximate 20% reduction in data processing time is achieved compared to the more accurate variable CD approach. This is one of the fundamental reasons for the space industry to adopt the fixed value method, especially when timely prediction of orbits is the primary goal to many orbit applications. This research has presented the fitting function approach for CD value prediction and the results have demonstrated that higher accuracy orbit predictions without degradation to the efficiency are achieved compared to the fix 2.2 CD method. Thus, this research will provide a valuable performance assessment of the conventional and the fitting function CD value estimation/prediction approaches for atmospheric research. In addition,…
Subjects/Keywords: Fields of Research; Atmospheric Drag; Coefficient of Drag; Space Debris
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APA ·
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APA (6th Edition):
Wong, B. (2012). The enhancement of atmospheric drag prediction using space-tracking data for accurate debris surveillance and collision warning. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:160226
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wong, B. “The enhancement of atmospheric drag prediction using space-tracking data for accurate debris surveillance and collision warning.” 2012. Thesis, RMIT University. Accessed January 25, 2021.
http://researchbank.rmit.edu.au/view/rmit:160226.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wong, B. “The enhancement of atmospheric drag prediction using space-tracking data for accurate debris surveillance and collision warning.” 2012. Web. 25 Jan 2021.
Vancouver:
Wong B. The enhancement of atmospheric drag prediction using space-tracking data for accurate debris surveillance and collision warning. [Internet] [Thesis]. RMIT University; 2012. [cited 2021 Jan 25].
Available from: http://researchbank.rmit.edu.au/view/rmit:160226.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wong B. The enhancement of atmospheric drag prediction using space-tracking data for accurate debris surveillance and collision warning. [Thesis]. RMIT University; 2012. Available from: http://researchbank.rmit.edu.au/view/rmit:160226
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universiteit Utrecht
27.
Oostrik, S.E.
Doing Drag:
From Subordinate Queers to Fabulous Queens
Drag as an Empowerment Strategy for Gay Men.
Degree: 2014, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/299329
This thesis explores and illustrates how drag can be empowering for homosexual men. It does so by drawing on theories of masculinities and performativity and through interviews with four Dutch drag queens.
Advisors/Committee Members: Thiele, K..Subjects/Keywords: drag; drag queen; gay; empowerment; homosexuality; performance; Butler; Connell; masculinities; gender
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APA ·
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MLA ·
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Export
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APA (6th Edition):
Oostrik, S. E. (2014). Doing Drag:
From Subordinate Queers to Fabulous Queens
Drag as an Empowerment Strategy for Gay Men. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/299329
Chicago Manual of Style (16th Edition):
Oostrik, S E. “Doing Drag:
From Subordinate Queers to Fabulous Queens
Drag as an Empowerment Strategy for Gay Men.” 2014. Masters Thesis, Universiteit Utrecht. Accessed January 25, 2021.
http://dspace.library.uu.nl:8080/handle/1874/299329.
MLA Handbook (7th Edition):
Oostrik, S E. “Doing Drag:
From Subordinate Queers to Fabulous Queens
Drag as an Empowerment Strategy for Gay Men.” 2014. Web. 25 Jan 2021.
Vancouver:
Oostrik SE. Doing Drag:
From Subordinate Queers to Fabulous Queens
Drag as an Empowerment Strategy for Gay Men. [Internet] [Masters thesis]. Universiteit Utrecht; 2014. [cited 2021 Jan 25].
Available from: http://dspace.library.uu.nl:8080/handle/1874/299329.
Council of Science Editors:
Oostrik SE. Doing Drag:
From Subordinate Queers to Fabulous Queens
Drag as an Empowerment Strategy for Gay Men. [Masters Thesis]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/299329
University of Houston
28.
-3861-2817.
"How Do You Define Art?": RuPaul's Drag Race's Influence On Drag Queen Identity And Group Culture.
Degree: MA, Communication, 2017, University of Houston
URL: http://hdl.handle.net/10657/4560
► This thesis provides insight into how the popular program RuPaul’s Drag Race affects drag identity and drag culture. This program sparks a contentious, but also…
(more)
▼ This thesis provides insight into how the popular program RuPaul’s
Drag Race affects
drag identity and
drag culture. This program sparks a contentious, but also thoughtful, narrative of how those who participate in Houston
drag culture identify and define group culture. At the same time, the show creates a semiotic sphere to explore group identity with diverse audiences and participants. Through a photovoice approach and semi-structured interviews with 12
drag participants, I illustrate how
drag queens feel the show widened
drag audiences but created generational divisions and diluted
drag styles.
Advisors/Committee Members: Northup, Temple (advisor), Yamasaki, Jill (committee member), Karner, Tracy Xavia (committee member).
Subjects/Keywords: Drag culture; Media; Mass communication; Entertainment; Rupaul's drag race
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APA (6th Edition):
-3861-2817. (2017). "How Do You Define Art?": RuPaul's Drag Race's Influence On Drag Queen Identity And Group Culture. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/4560
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-3861-2817. “"How Do You Define Art?": RuPaul's Drag Race's Influence On Drag Queen Identity And Group Culture.” 2017. Masters Thesis, University of Houston. Accessed January 25, 2021.
http://hdl.handle.net/10657/4560.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-3861-2817. “"How Do You Define Art?": RuPaul's Drag Race's Influence On Drag Queen Identity And Group Culture.” 2017. Web. 25 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-3861-2817. "How Do You Define Art?": RuPaul's Drag Race's Influence On Drag Queen Identity And Group Culture. [Internet] [Masters thesis]. University of Houston; 2017. [cited 2021 Jan 25].
Available from: http://hdl.handle.net/10657/4560.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-3861-2817. "How Do You Define Art?": RuPaul's Drag Race's Influence On Drag Queen Identity And Group Culture. [Masters Thesis]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4560
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Delft University of Technology
29.
Martinez de la Cruz, Roberto (author).
Underwater Drag Reduction: Air Layer Stability over SuperHydrophobic Surface under Turbulent Conditions: A thesis submitted for the degree of MSc Aerospace Engineering at TU Deflt.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b401d3a9-4800-4340-8c78-50a3fbae299b
► Framed in the current trend of global energetic efficiency, active drag reduction techniques in water vehicles have regained popularity in the last decades thanks to…
(more)
▼ Framed in the current trend of global energetic efficiency, active
drag reduction techniques in water vehicles have regained popularity in the last decades thanks to the intense research in the air lubrication approach. Within the last decade, bubbly
drag reduction has yielded its place to air layer
drag reduction, in which a thin, continuous air layer is produced under the ship’s hull. Reductions in friction
drag have shown to be between the 80 and 99% and net energy savings of around 8-12 % have been predicted, which is however probably not enough to compensate the complexity of the system. Nevertheless, by coating the lower part of the hull with a superhydrophobic coating, C. Peifer et al. (2019) showed that air flow requirements to obtain a stable air layer diminished by a factor of three. Thereportpresented here is a first study of the mechanisms that enhance the air layer stability when combined with a superhydrophobic surface. Water impact dynamics and free surface - turbulence interaction are studied experimentally and numerically respectively. Water behaviour upon impact has been investigated through an ascending jet impacting on the underside of four different surfaces with contact angles ranging from 45 to 150 degrees, obtaining the plate forces and top and side views of the water spread on the surface. Interesting results regarding the collapse of the spread area when a modified Weber number is used has been obtained. Two characteristic dewetting mechanisms for surfaces with low and high contact angle have been identified and explained by a simple theoretical model. Furthermore, possible independence of the friction coefficient on the surface wettability characteristic has been found. When plotted against the streamwise Reynolds number all surfaces collapse in the theoretical Blasius laminar friction coefficient, which suggests that once the surface is fully wetted (Wenzel state), the lower dimensional
drag seen in (super)hydrophobic surfaces is due solely to their smaller contact area. To the best of our knowledge, these comprise the first experiments in which area and force were measured in a scenario in which viscosity, inertia, surface tension and gravity shape the water flow characteristics. On the other hand, a numerical model based on the classic elastic membrane concept has been employed to represent the deformations due to turbulence pounding in an air-water interface. Although further adjustments are needed, the model has been able to predict the tow tank experiments in C. Peifer et al. (2019) by using the surface-dependent water spread obtained in the water impact experiment. The dependence of the critical air flux to form a stable air layer on the surface wettability characteristics can therefore be predicted.
Advisors/Committee Members: Delft University of Technology (degree granting institution).
Subjects/Keywords: Superhydrophobic Surfaces; Air Layer Drag Reduction; Drag Reduction; Multiphase Flow
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APA (6th Edition):
Martinez de la Cruz, R. (. (2019). Underwater Drag Reduction: Air Layer Stability over SuperHydrophobic Surface under Turbulent Conditions: A thesis submitted for the degree of MSc Aerospace Engineering at TU Deflt. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b401d3a9-4800-4340-8c78-50a3fbae299b
Chicago Manual of Style (16th Edition):
Martinez de la Cruz, Roberto (author). “Underwater Drag Reduction: Air Layer Stability over SuperHydrophobic Surface under Turbulent Conditions: A thesis submitted for the degree of MSc Aerospace Engineering at TU Deflt.” 2019. Masters Thesis, Delft University of Technology. Accessed January 25, 2021.
http://resolver.tudelft.nl/uuid:b401d3a9-4800-4340-8c78-50a3fbae299b.
MLA Handbook (7th Edition):
Martinez de la Cruz, Roberto (author). “Underwater Drag Reduction: Air Layer Stability over SuperHydrophobic Surface under Turbulent Conditions: A thesis submitted for the degree of MSc Aerospace Engineering at TU Deflt.” 2019. Web. 25 Jan 2021.
Vancouver:
Martinez de la Cruz R(. Underwater Drag Reduction: Air Layer Stability over SuperHydrophobic Surface under Turbulent Conditions: A thesis submitted for the degree of MSc Aerospace Engineering at TU Deflt. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 25].
Available from: http://resolver.tudelft.nl/uuid:b401d3a9-4800-4340-8c78-50a3fbae299b.
Council of Science Editors:
Martinez de la Cruz R(. Underwater Drag Reduction: Air Layer Stability over SuperHydrophobic Surface under Turbulent Conditions: A thesis submitted for the degree of MSc Aerospace Engineering at TU Deflt. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:b401d3a9-4800-4340-8c78-50a3fbae299b
Delft University of Technology
30.
Kohlmann, Lars (author).
A frequency dependent drag coefficient on the motion response of a hybrid STC wind-wave energy converter.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:2f1dc98e-9544-4817-83f3-3c26d2964934
► The vertical viscous drag force acting on a heaving cylinder with flat and hemispheric bases is investigated by means of an experiment, a linear and…
(more)
▼ The vertical viscous drag force acting on a heaving cylinder with flat and hemispheric bases is investigated by means of an experiment, a linear and a nonlinear analytic model. Viscous effects create a significant uncertainty in estimating the motion response of oscillating cylinders in waves of different frequencies. Forced oscillation tests are compared with a linear analytic model and approximated with a nonlinear model to quantify the viscous drag force for a range of oscillating frequencies. The results asses the behaviour of the drag coefficient, CD, to be used for calculating the drag force. The main interest of this study is to improve the estimation of the motion response of floating hybrid wind-wave energy converters. The hydrodynamic parameters, added mass and radiation damping, used in the linear model are obtained with the boundary element method (BEM) solver NEMOH. The same parameters are obtained from the experiment for comparison. Near the natural frequency of the geometries the linear model underestimate the forces due to the absence of a nonlinear viscous drag term. The time traces of the force measurement around the natural frequencies show period doubling behaviour which can be described by the quadratic velocity term in the drag force calculation. By applying the least-squares optimization method on the obtained data, optimal variables in the fit-function including the quadratic drag term are found. The results show the drag coefficient, CD, is changing over the frequency of oscillation. The vertical drag force is frequency dependent and therefore important to consider when calculating the motion response of wave energy converters
Ship Hydrodynamics
Advisors/Committee Members: Wellens, Peter (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Drag coefficient; WEC; Viscous drag; Damping; Heave; Forced Motion; Frequency
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Kohlmann, L. (. (2019). A frequency dependent drag coefficient on the motion response of a hybrid STC wind-wave energy converter. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2f1dc98e-9544-4817-83f3-3c26d2964934
Chicago Manual of Style (16th Edition):
Kohlmann, Lars (author). “A frequency dependent drag coefficient on the motion response of a hybrid STC wind-wave energy converter.” 2019. Masters Thesis, Delft University of Technology. Accessed January 25, 2021.
http://resolver.tudelft.nl/uuid:2f1dc98e-9544-4817-83f3-3c26d2964934.
MLA Handbook (7th Edition):
Kohlmann, Lars (author). “A frequency dependent drag coefficient on the motion response of a hybrid STC wind-wave energy converter.” 2019. Web. 25 Jan 2021.
Vancouver:
Kohlmann L(. A frequency dependent drag coefficient on the motion response of a hybrid STC wind-wave energy converter. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 25].
Available from: http://resolver.tudelft.nl/uuid:2f1dc98e-9544-4817-83f3-3c26d2964934.
Council of Science Editors:
Kohlmann L(. A frequency dependent drag coefficient on the motion response of a hybrid STC wind-wave energy converter. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:2f1dc98e-9544-4817-83f3-3c26d2964934
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Open Access Theses and Dissertations
