subject:(Fluid dynamics)

Rutgers University

1. Adepu, Manogna, 1991-. A numerical study of cohesive and non-cohesive particles in a bottom spray fluidized bed using fully coupled CFD-DEM simulations.

Degree: MS, Chemical and Biochemical Engineering, 2015, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/47244/

► Fully coupled CFD-DEM simulations were conducted to investigate the applicability of the van der Waals cohesive force model to a bottom spray fluid bed. For… (more)

Subjects/Keywords: Computational fluid dynamics; Fluid dynamics

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APA (6^th Edition):

Adepu, Manogna, 1. (2015). A numerical study of cohesive and non-cohesive particles in a bottom spray fluidized bed using fully coupled CFD-DEM simulations. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/47244/

Chicago Manual of Style (16^th Edition):

Adepu, Manogna, 1991-. “A numerical study of cohesive and non-cohesive particles in a bottom spray fluidized bed using fully coupled CFD-DEM simulations.” 2015. Masters Thesis, Rutgers University. Accessed March 02, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/47244/.

MLA Handbook (7^th Edition):

Adepu, Manogna, 1991-. “A numerical study of cohesive and non-cohesive particles in a bottom spray fluidized bed using fully coupled CFD-DEM simulations.” 2015. Web. 02 Mar 2021.

Vancouver:

Adepu, Manogna 1. A numerical study of cohesive and non-cohesive particles in a bottom spray fluidized bed using fully coupled CFD-DEM simulations. [Internet] [Masters thesis]. Rutgers University; 2015. [cited 2021 Mar 02]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47244/.

Council of Science Editors:

Adepu, Manogna 1. A numerical study of cohesive and non-cohesive particles in a bottom spray fluidized bed using fully coupled CFD-DEM simulations. [Masters Thesis]. Rutgers University; 2015. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/47244/

McMaster University

2. Ritcey, Adam. Skin Friction and Fluid Dynamics of a Planar Impinging Gas Jet.

Degree: PhD, 2018, McMaster University

URL: http://hdl.handle.net/11375/23656

►

Impinging gas jets have many engineering applications, including propulsion, cooling, drying, and coating control processes. In continuous hot-dip galvanizing, a molten zinc-based coating is applied… (more)

▼

Impinging gas jets have many engineering applications, including propulsion, cooling, drying, and coating control processes. In continuous hot-dip galvanizing, a molten zinc-based coating is applied to a steel substrate for corrosion protection. Planar impinging gas jets (industrially called air-knives) are employed to wipe the protective coating from the steel sheet to control the final coating weight. The maximum skin friction and pressure gradient developed by the impinging gas jet on the steel sheet heavily influences the final coating weight. In the thesis, the maximum skin friction developed on an rigid impingement plate positioned downstream of a planar impinging gas jet (scaled-up model air-knife) is measured using oil film interferometry (OFI). A maximum skin friction map based on the jet operating conditions is established, which can be used in conjunction with industrial coating weight models for film thickness prediction, and can be further employed in the assessment and verification of computational fluid dynamic (CFD) models. As impinging gas jets reach higher flow velocities, inherent instabilities in the jet can amplify due to feedback loops created between the jet exit and the impingement plate. The flow field characteristics under resonance conditions are known to exhibit large amplitude jet column oscillations, and strong coherent fluid structures propagating down the impinging shear layers. This work examined the global effect of planar impinging gas jet oscillations on the maximum mean skin friction developed in the stagnation region using external jet forcing. Reductions in maximum mean impingement plate skin friction were confirmed and found to be caused by increased levels of fluid entrainment under jet forcing conditions. The fluctuating velocity fields under external jet forcing was also examined. The velocity fluctuations due to both the coherent motion of the jet column, and the turbulence were obtained and analyzed using fluid dynamic tools such as particle image velocimetry (PIV) and proper orthogonal decomposition (POD). The fluctuating velocity of the planar impinging gas jet displayed increased levels of fluctuation intensity and unique flow field characteristics under external forcing, as well as, exhibited similar features to that of a high speed impinging planar gas jet under fluid resonance conditions. Overall, it is determined that enhanced planar impinging gas jet oscillations (or equivalent air-knife oscillations) is associated with adverse fluid effects, which degrade the wiping performance of the jet.

Thesis

Doctor of Philosophy (PhD)

Advisors/Committee Members: Ziada, Samir, McDermid, Joseph, Mechanical Engineering.

Subjects/Keywords: Fluid dynamics

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APA (6^th Edition):

Ritcey, A. (2018). Skin Friction and Fluid Dynamics of a Planar Impinging Gas Jet. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/23656

Chicago Manual of Style (16^th Edition):

Ritcey, Adam. “Skin Friction and Fluid Dynamics of a Planar Impinging Gas Jet.” 2018. Doctoral Dissertation, McMaster University. Accessed March 02, 2021. http://hdl.handle.net/11375/23656.

MLA Handbook (7^th Edition):

Ritcey, Adam. “Skin Friction and Fluid Dynamics of a Planar Impinging Gas Jet.” 2018. Web. 02 Mar 2021.

Vancouver:

Ritcey A. Skin Friction and Fluid Dynamics of a Planar Impinging Gas Jet. [Internet] [Doctoral dissertation]. McMaster University; 2018. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/11375/23656.

Council of Science Editors:

Ritcey A. Skin Friction and Fluid Dynamics of a Planar Impinging Gas Jet. [Doctoral Dissertation]. McMaster University; 2018. Available from: http://hdl.handle.net/11375/23656

3. Liu, Xiaohe. Smoothed Profile Method: Error Analysis, Verification and Application in Dielectric Problems.

Degree: Fluid, Thermal, and Chemical Processes, 2017, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:733421/

► We study the smoothed profile method (SPM) first proposed by Nakayama & Yamamoto (2005) and extended by Luo et al. (2009), which is a numerical… (more)

Subjects/Keywords: Fluid Dynamics

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APA (6^th Edition):

Liu, X. (2017). Smoothed Profile Method: Error Analysis, Verification and Application in Dielectric Problems. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:733421/

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

Chicago Manual of Style (16^th Edition):

Liu, Xiaohe. “Smoothed Profile Method: Error Analysis, Verification and Application in Dielectric Problems.” 2017. Thesis, Brown University. Accessed March 02, 2021. https://repository.library.brown.edu/studio/item/bdr:733421/.

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

MLA Handbook (7^th Edition):

Liu, Xiaohe. “Smoothed Profile Method: Error Analysis, Verification and Application in Dielectric Problems.” 2017. Web. 02 Mar 2021.

Vancouver:

Liu X. Smoothed Profile Method: Error Analysis, Verification and Application in Dielectric Problems. [Internet] [Thesis]. Brown University; 2017. [cited 2021 Mar 02]. Available from: https://repository.library.brown.edu/studio/item/bdr:733421/.

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

Council of Science Editors:

Liu X. Smoothed Profile Method: Error Analysis, Verification and Application in Dielectric Problems. [Thesis]. Brown University; 2017. Available from: https://repository.library.brown.edu/studio/item/bdr:733421/

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

4. Park, Joonsik. Nanoscale measurement of flow near a contact line.

Degree: Fluid, Thermal, and Chemical Processes, 2016, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:733467/

► We examine the nanoscopic flow near a contact line by using a probabilistic approach to derive the velocity field from tracer nanoparticles illuminated by an… (more)

Subjects/Keywords: Fluid Dynamics

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APA (6^th Edition):

Park, J. (2016). Nanoscale measurement of flow near a contact line. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:733467/

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

Chicago Manual of Style (16^th Edition):

Park, Joonsik. “Nanoscale measurement of flow near a contact line.” 2016. Thesis, Brown University. Accessed March 02, 2021. https://repository.library.brown.edu/studio/item/bdr:733467/.

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

MLA Handbook (7^th Edition):

Park, Joonsik. “Nanoscale measurement of flow near a contact line.” 2016. Web. 02 Mar 2021.

Vancouver:

Park J. Nanoscale measurement of flow near a contact line. [Internet] [Thesis]. Brown University; 2016. [cited 2021 Mar 02]. Available from: https://repository.library.brown.edu/studio/item/bdr:733467/.

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

Council of Science Editors:

Park J. Nanoscale measurement of flow near a contact line. [Thesis]. Brown University; 2016. Available from: https://repository.library.brown.edu/studio/item/bdr:733467/

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

University of Manitoba

5. Mali, Sarwesh. Flow analysis of Rimer Alco North America's Refuge One.

Degree: Mechanical Engineering, 2015, University of Manitoba

URL: http://hdl.handle.net/1993/31729

► This study is part of a multi-disciplinary research effort to better understand, document and optimize the operation of Rimer Alco North America’s Refuge One for… (more)

Subjects/Keywords: Fluid dynamics

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APA (6^th Edition):

Mali, S. (2015). Flow analysis of Rimer Alco North America's Refuge One. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/31729

Chicago Manual of Style (16^th Edition):

Mali, Sarwesh. “Flow analysis of Rimer Alco North America's Refuge One.” 2015. Masters Thesis, University of Manitoba. Accessed March 02, 2021. http://hdl.handle.net/1993/31729.

MLA Handbook (7^th Edition):

Mali, Sarwesh. “Flow analysis of Rimer Alco North America's Refuge One.” 2015. Web. 02 Mar 2021.

Vancouver:

Mali S. Flow analysis of Rimer Alco North America's Refuge One. [Internet] [Masters thesis]. University of Manitoba; 2015. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1993/31729.

Council of Science Editors:

Mali S. Flow analysis of Rimer Alco North America's Refuge One. [Masters Thesis]. University of Manitoba; 2015. Available from: http://hdl.handle.net/1993/31729

Hong Kong University of Science and Technology

6. Liu, Chong. Molecular dynamics simulation of nanochannel flows.

Degree: 2011, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-7201 ; https://doi.org/10.14711/thesis-b1146181 ; http://repository.ust.hk/ir/bitstream/1783.1-7201/1/th_redirect.html

► Nanoscale fluid flow systems involve both microscopic and macroscopic parameters, which may couple with each another and lead to many special properties. The primary objective… (more)

Subjects/Keywords: Nanofluids ; Molecular dynamics ; Fluid dynamics

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APA (6^th Edition):

Liu, C. (2011). Molecular dynamics simulation of nanochannel flows. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7201 ; https://doi.org/10.14711/thesis-b1146181 ; http://repository.ust.hk/ir/bitstream/1783.1-7201/1/th_redirect.html

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

Chicago Manual of Style (16^th Edition):

Liu, Chong. “Molecular dynamics simulation of nanochannel flows.” 2011. Thesis, Hong Kong University of Science and Technology. Accessed March 02, 2021. http://repository.ust.hk/ir/Record/1783.1-7201 ; https://doi.org/10.14711/thesis-b1146181 ; http://repository.ust.hk/ir/bitstream/1783.1-7201/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Liu, Chong. “Molecular dynamics simulation of nanochannel flows.” 2011. Web. 02 Mar 2021.

Vancouver:

Liu C. Molecular dynamics simulation of nanochannel flows. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2011. [cited 2021 Mar 02]. Available from: http://repository.ust.hk/ir/Record/1783.1-7201 ; https://doi.org/10.14711/thesis-b1146181 ; http://repository.ust.hk/ir/bitstream/1783.1-7201/1/th_redirect.html.

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

Council of Science Editors:

Liu C. Molecular dynamics simulation of nanochannel flows. [Thesis]. Hong Kong University of Science and Technology; 2011. Available from: http://repository.ust.hk/ir/Record/1783.1-7201 ; https://doi.org/10.14711/thesis-b1146181 ; http://repository.ust.hk/ir/bitstream/1783.1-7201/1/th_redirect.html

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

Queens University

7. Payne, Graham. Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet .

Degree: Mechanical and Materials Engineering, 2014, Queens University

URL: http://hdl.handle.net/1974/12410

► The ultimate goal of this work was to optimize a polymer flame deposition process by developing an experimentally verified numerical model of it. This process… (more)

▼ The ultimate goal of this work was to optimize a polymer flame deposition process by developing an experimentally verified numerical model of it. This process consisted of injecting a polymer powder into an air/propane flame where the powder was heated enough to soften it before it was projected on to a substrate to provide a protective coating. Intermediate goals towards the final goal were identified. This thesis was based on four papers with each paper reporting the results of the work on an intermediate goal. The first paper reported on work with the turbulent coaxial air jet created by shutting off the flow of propane and polymer particles to the torch head. Experimental measurements of the flow field were compared to the results of numerical simulations using different Reynolds Average Navier Stokes (RANS) models. The k-ε realizable model provided the best agreement with the axial velocity measurements, but all the RANS models predicted a recirculation zone immediately downstream of the central jet that did not exist. The next paper described two phase flow created by the introduction of polymer particles into the air stream to the central air jet. A sheet of laser light and high speed digital imaging were used to determine the particle velocities, which varied widely because the particle size and shapes varied widely. The radial particle distribution was roughly Gaussian. The third paper described the use of the large eddy simulation (LES) turbulence model in Fluent to try to improve the agreement between experiment and numerical results. The LES results did not predict any recirculation zones, but agreement with experimental axial velocities was worse than with the RANS simulation results. Overall, no numerical model’s results agreed with all experimental results within 10%, so their further development was abandoned. The fourth paper described mixing when propane was replaced with air or CO2 and seeded with fine water/glycerine droplets. These jets were rapidly but irregularly entrained in the coaxial air jet. Gas sampling showed this irregular entrainment was related to significant variations in the concentrations of CO2 off the jet centerline. Introducing a particle stream had little effect on the CO2 concentrations.

Subjects/Keywords: Numerical Fluid Dynamics ; Experimental Multiphase Fluid Dynamics

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APA (6^th Edition):

Payne, G. (2014). Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/12410

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

Chicago Manual of Style (16^th Edition):

Payne, Graham. “Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet .” 2014. Thesis, Queens University. Accessed March 02, 2021. http://hdl.handle.net/1974/12410.

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

MLA Handbook (7^th Edition):

Payne, Graham. “Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet .” 2014. Web. 02 Mar 2021.

Vancouver:

Payne G. Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet . [Internet] [Thesis]. Queens University; 2014. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1974/12410.

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

Council of Science Editors:

Payne G. Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet . [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/12410

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

Oregon State University

8. Neill, Patrick. Fluid flow on interacting, deformable surfaces.

Degree: MS, Computer Science, 2008, Oregon State University

URL: http://hdl.handle.net/1957/8929

► Fluid simulation is an interesting research problem with a wide range of applications including mechanical engineering, special effects in movies and games, and scientific simulation.… (more)

Subjects/Keywords: Computational Fluid Dynamics; Fluid dynamics – Computer simulation

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APA (6^th Edition):

Neill, P. (2008). Fluid flow on interacting, deformable surfaces. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/8929

Chicago Manual of Style (16^th Edition):

Neill, Patrick. “Fluid flow on interacting, deformable surfaces.” 2008. Masters Thesis, Oregon State University. Accessed March 02, 2021. http://hdl.handle.net/1957/8929.

MLA Handbook (7^th Edition):

Neill, Patrick. “Fluid flow on interacting, deformable surfaces.” 2008. Web. 02 Mar 2021.

Vancouver:

Neill P. Fluid flow on interacting, deformable surfaces. [Internet] [Masters thesis]. Oregon State University; 2008. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1957/8929.

Council of Science Editors:

Neill P. Fluid flow on interacting, deformable surfaces. [Masters Thesis]. Oregon State University; 2008. Available from: http://hdl.handle.net/1957/8929

Portland State University

9. Cardin, Karl Jeffrey Theodore. Jet Rebound from Hydrophobic Substrates in Microgravity.

Degree: MS(M.S.) in Mechanical Engineering, Mechanical Engineering, 2019, Portland State University

URL: https://pdxscholar.library.pdx.edu/open_access_etds/4830

► We experimentally investigate the phenomena of large jet rebound, a mode of fluid transfer following oblique jet impacts on hydrophobic substrates. We initially seek… (more)

Subjects/Keywords: Fluid dynamics; Reduced gravity environments; Fluid Dynamics

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APA (6^th Edition):

Cardin, K. J. T. (2019). Jet Rebound from Hydrophobic Substrates in Microgravity. (Masters Thesis). Portland State University. Retrieved from https://pdxscholar.library.pdx.edu/open_access_etds/4830

Chicago Manual of Style (16^th Edition):

Cardin, Karl Jeffrey Theodore. “Jet Rebound from Hydrophobic Substrates in Microgravity.” 2019. Masters Thesis, Portland State University. Accessed March 02, 2021. https://pdxscholar.library.pdx.edu/open_access_etds/4830.

MLA Handbook (7^th Edition):

Cardin, Karl Jeffrey Theodore. “Jet Rebound from Hydrophobic Substrates in Microgravity.” 2019. Web. 02 Mar 2021.

Vancouver:

Cardin KJT. Jet Rebound from Hydrophobic Substrates in Microgravity. [Internet] [Masters thesis]. Portland State University; 2019. [cited 2021 Mar 02]. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/4830.

Council of Science Editors:

Cardin KJT. Jet Rebound from Hydrophobic Substrates in Microgravity. [Masters Thesis]. Portland State University; 2019. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/4830

Oregon State University

10. Koll, Christopher J. A CFD Analysis of a Single Channel in the Mars Hopper Engine.

Degree: MS, 2017, Oregon State University

URL: http://hdl.handle.net/1957/61894

► The Mars Hopper is an alternative extraterrestrial vehicle for the collection of samples from the Martian surface. This thesis studied the engine of the Mars… (more)

Subjects/Keywords: Computational Fluid Dynamics

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APA (6^th Edition):

Koll, C. J. (2017). A CFD Analysis of a Single Channel in the Mars Hopper Engine. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/61894

Chicago Manual of Style (16^th Edition):

Koll, Christopher J. “A CFD Analysis of a Single Channel in the Mars Hopper Engine.” 2017. Masters Thesis, Oregon State University. Accessed March 02, 2021. http://hdl.handle.net/1957/61894.

MLA Handbook (7^th Edition):

Koll, Christopher J. “A CFD Analysis of a Single Channel in the Mars Hopper Engine.” 2017. Web. 02 Mar 2021.

Vancouver:

Koll CJ. A CFD Analysis of a Single Channel in the Mars Hopper Engine. [Internet] [Masters thesis]. Oregon State University; 2017. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/1957/61894.

Council of Science Editors:

Koll CJ. A CFD Analysis of a Single Channel in the Mars Hopper Engine. [Masters Thesis]. Oregon State University; 2017. Available from: http://hdl.handle.net/1957/61894

11. Allawala, Altan Turowicz. Direct Statistical Simulation of Chaos and Turbulence.

Degree: Department of Physics, 2017, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:792604/

► Statistical descriptions are well-suited for chaotic systems and turbulent flows. A common strategy for studying the statistics of such systems is Direct Numerical Simulation (DNS).… (more)

▼ Statistical descriptions are well-suited for chaotic systems and turbulent flows. A common strategy for studying the statistics of such systems is Direct Numerical Simulation (DNS). However accumulating statistics via DNS can be inefficient because convergence to a statistically steady-state is slow, especially in systems with rare but large deviations as are often found in chaotic systems and turbulent flows. Another drawback of DNS is that it is difficult to extract the physics from the computed numbers. In this thesis I present two alternative strategies to directly solve for the statistics. In the first part, a Fokker-Planck description is used to study the equal-time statistics of the stochastically-forced Lorenz attractor. In particular, the steady-state probability distribution of the attractor is solved for directly by computing the zero mode of a Fokker-Planck operator. I also investigate a perturbative expansion in the equal-time cumulants of the system, tested on the Lorenz attractor and on two idealized barotropic models. Since low-order statistics tend to be spatially smoother than the corresponding dynamical fields, this method can capture the macroscopic features of turbulent flows using fewer degrees of freedom. An added benefit of such a cumulant expansion scheme is that the small-scale modes are integrated out, leaving only large-scale modes containing information about the coherent structures of interest. These modes are associated with the low-order statistics of the system and might be described by a fixed point or slow manifold, allowing for quicker convergence to a statistically steady state. Since this perturbative expansion suffers from the "curse of dimensionality", I detail my efforts to resolve this issue via a dimensional reduction scheme that uses a type of unsupervised machine learning technique known as Proper Orthogonal Decomposition. This involves rotating into a new coordinate system spanned by the eigenvectors of the vorticity second cumulants of the system and retaining only the most energetic modes. A substantial basis reduction with order of magnitude computational gains is demonstrated, providing an accurate alternative to directly accessing the low-order statistics of turbulent flows. Advisors/Committee Members: Marston, Brad (Advisor), Pelcovits, Robert (Reader), Mandre, Shreyas (Reader).

Subjects/Keywords: Computational fluid dynamics

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APA (6^th Edition):

Allawala, A. T. (2017). Direct Statistical Simulation of Chaos and Turbulence. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:792604/

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

Chicago Manual of Style (16^th Edition):

Allawala, Altan Turowicz. “Direct Statistical Simulation of Chaos and Turbulence.” 2017. Thesis, Brown University. Accessed March 02, 2021. https://repository.library.brown.edu/studio/item/bdr:792604/.

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

MLA Handbook (7^th Edition):

Allawala, Altan Turowicz. “Direct Statistical Simulation of Chaos and Turbulence.” 2017. Web. 02 Mar 2021.

Vancouver:

Allawala AT. Direct Statistical Simulation of Chaos and Turbulence. [Internet] [Thesis]. Brown University; 2017. [cited 2021 Mar 02]. Available from: https://repository.library.brown.edu/studio/item/bdr:792604/.

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

Council of Science Editors:

Allawala AT. Direct Statistical Simulation of Chaos and Turbulence. [Thesis]. Brown University; 2017. Available from: https://repository.library.brown.edu/studio/item/bdr:792604/

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

12. Yin, Minglang. 3D/1D COMPUTED FRACTIONAL FLOW RESERVE COMPARISON IN CORONARY ARTERY DISEASE.

Degree: Fluid, Thermal, and Chemical Processes, 2018, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:792675/

► Fractional Flow Reserve (FFR) has become the gold standard for diagnosing coronary artery disease (CAD) since Gould et al. [11] claimed so whilst the most… (more)

Subjects/Keywords: Computational fluid dynamics

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APA (6^th Edition):

Yin, M. (2018). 3D/1D COMPUTED FRACTIONAL FLOW RESERVE COMPARISON IN CORONARY ARTERY DISEASE. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:792675/

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

Chicago Manual of Style (16^th Edition):

Yin, Minglang. “3D/1D COMPUTED FRACTIONAL FLOW RESERVE COMPARISON IN CORONARY ARTERY DISEASE.” 2018. Thesis, Brown University. Accessed March 02, 2021. https://repository.library.brown.edu/studio/item/bdr:792675/.

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

MLA Handbook (7^th Edition):

Yin, Minglang. “3D/1D COMPUTED FRACTIONAL FLOW RESERVE COMPARISON IN CORONARY ARTERY DISEASE.” 2018. Web. 02 Mar 2021.

Vancouver:

Yin M. 3D/1D COMPUTED FRACTIONAL FLOW RESERVE COMPARISON IN CORONARY ARTERY DISEASE. [Internet] [Thesis]. Brown University; 2018. [cited 2021 Mar 02]. Available from: https://repository.library.brown.edu/studio/item/bdr:792675/.

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

Council of Science Editors:

Yin M. 3D/1D COMPUTED FRACTIONAL FLOW RESERVE COMPARISON IN CORONARY ARTERY DISEASE. [Thesis]. Brown University; 2018. Available from: https://repository.library.brown.edu/studio/item/bdr:792675/

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

Boston University

13. Patterson, Colin. Reducing the contact time of impinging droplets on non-wetting surfaces.

Degree: MS, Mechanical Engineering, 2015, Boston University

URL: http://hdl.handle.net/2144/15707

► This work examines the use of macro-textured surfaces to reduce the contact time between impinging liquid droplets and non-wetting surfaces. Six macro-texture geometries are evaluated… (more)

Subjects/Keywords: Engineering; Fluid dynamics

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APA (6^th Edition):

Patterson, C. (2015). Reducing the contact time of impinging droplets on non-wetting surfaces. (Masters Thesis). Boston University. Retrieved from http://hdl.handle.net/2144/15707

Chicago Manual of Style (16^th Edition):

Patterson, Colin. “Reducing the contact time of impinging droplets on non-wetting surfaces.” 2015. Masters Thesis, Boston University. Accessed March 02, 2021. http://hdl.handle.net/2144/15707.

MLA Handbook (7^th Edition):

Patterson, Colin. “Reducing the contact time of impinging droplets on non-wetting surfaces.” 2015. Web. 02 Mar 2021.

Vancouver:

Patterson C. Reducing the contact time of impinging droplets on non-wetting surfaces. [Internet] [Masters thesis]. Boston University; 2015. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/2144/15707.

Council of Science Editors:

Patterson C. Reducing the contact time of impinging droplets on non-wetting surfaces. [Masters Thesis]. Boston University; 2015. Available from: http://hdl.handle.net/2144/15707

University of Waikato

14. Ross, Joseph. A Review of the Dynamics and Oscillations of the Atmosphere .

Degree: 2012, University of Waikato

URL: http://hdl.handle.net/10289/6480

► The atmosphere is a complex, dynamic system and the weather depends on its state. There are many different phenomena that affect the state of the… (more)

Subjects/Keywords: fluid dynamics; atmosphere

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APA (6^th Edition):

Ross, J. (2012). A Review of the Dynamics and Oscillations of the Atmosphere . (Masters Thesis). University of Waikato. Retrieved from http://hdl.handle.net/10289/6480

Chicago Manual of Style (16^th Edition):

Ross, Joseph. “A Review of the Dynamics and Oscillations of the Atmosphere .” 2012. Masters Thesis, University of Waikato. Accessed March 02, 2021. http://hdl.handle.net/10289/6480.

MLA Handbook (7^th Edition):

Ross, Joseph. “A Review of the Dynamics and Oscillations of the Atmosphere .” 2012. Web. 02 Mar 2021.

Vancouver:

Ross J. A Review of the Dynamics and Oscillations of the Atmosphere . [Internet] [Masters thesis]. University of Waikato; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10289/6480.

Council of Science Editors:

Ross J. A Review of the Dynamics and Oscillations of the Atmosphere . [Masters Thesis]. University of Waikato; 2012. Available from: http://hdl.handle.net/10289/6480

Florida State University

15. Santema, Michael. Spatial and Temporal Dynamics of Dissolved Oxygen on the Shallow Shelf in the Northeastern Gulf of Mexico.

Degree: PhD, 2013, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8630 ;

► Ch 1: This study provides the first long term data set on coastal oxygen dynamics in the northeastern Gulf of Mexico (NEGOM), located about 600… (more)

▼ Ch 1: This study provides the first long term data set on coastal oxygen dynamics in the northeastern Gulf of Mexico (NEGOM), located about 600 km east of the large hypoxic zone that extends west of the Mississippi delta. Oxygen concentrations and environmental parameters affecting the production and respiration of dissolved oxygen were measured over a 4-year period in the water column, and over a 2-year period in the benthic boundary layer (0.5 m above seafloor), along a 29 km long transect line following a depth gradient from 5 m to 18 m in the Florida Big Bend region of the West Florida Shelf. We show decreasing rates of oxygen production and consumption from the shallowest station to the deepest station that we attribute to the coastal energy gradient, i.e. higher light intensities, higher turbulent mixing rates and greater nutrient supply (organic-rich terrestrial runoff close to shore). Vertical profiles showed that oxygen production and consumption were highest in the benthic boundary layer (0.5 m above the seabed) from shore down to a water depth of 5 m; farther offshore, highest production and consumption values were generally measured higher in the water column. Water column photosynthetic oxygen production at an irradiance of 200 μE m-2 s-1 ranged from 0.5 to 4.5 mmol O2 m-3 h-1, and dark consumption rates ranged from 0.2 to 2.6 mmol O2 m-3 h-1. The water column was well mixed except during relatively short calm periods in summer and winter when a pycnocline developed. Oxygen below the pycnocline in summer dropped to 74% air saturation but never to levels that could have influenced aerobic life. Oxygen supersaturation as high as 118% air saturation was recorded during August 2007, reflecting high primary productivity of the upper water column. High wind events influenced dissolved oxygen down to the bottom at all stations. Our study shows the influence of the shore on the oxygen dynamics in the NEGOM Shelf and emphasizes the role of the benthic boundary layer for production and consumption processes in this shallow region. Ch 2: The West Florida Shelf is shallow and light can penetrate to its bottom facilitating photosynthesis at the sediment surface. This paper presents the first long term study of the activity of the benthic primary producers in the northeastern Gulf of Mexico. Photosynthetic rates of microphytobenthos colonizing permeable sandy sediments were quantified along a 29 km long transect starting at 5 m water depth and ending at 18 m water depth 29 km off the Northeast Gulf of Mexico coast during the 3-year study. The sediment of this region is classified as sand and slightly gravelly sand, being highly permeable. Chlorophyll concentrations and photosynthesis rates of the microphytobenthos showed relatively high rates of productivity for sediment from 20 m water depth compared to rates reported in studies from similar environments. In spring, the decrease of net production with depth amounted to approximately 0.11 mmol m-2 h-1 per 10 m water depth increase and consumption decreased by about… Advisors/Committee Members: Markus Huettel (professor directing dissertation), Janie Wulff (university representative), Kevin Speer (committee member), David Thistle (committee member), Allan Clarke (committee member).

Subjects/Keywords: Geophysics; Fluid dynamics

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APA (6^th Edition):

Santema, M. (2013). Spatial and Temporal Dynamics of Dissolved Oxygen on the Shallow Shelf in the Northeastern Gulf of Mexico. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8630 ;

Chicago Manual of Style (16^th Edition):

Santema, Michael. “Spatial and Temporal Dynamics of Dissolved Oxygen on the Shallow Shelf in the Northeastern Gulf of Mexico.” 2013. Doctoral Dissertation, Florida State University. Accessed March 02, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-8630 ;.

MLA Handbook (7^th Edition):

Santema, Michael. “Spatial and Temporal Dynamics of Dissolved Oxygen on the Shallow Shelf in the Northeastern Gulf of Mexico.” 2013. Web. 02 Mar 2021.

Vancouver:

Santema M. Spatial and Temporal Dynamics of Dissolved Oxygen on the Shallow Shelf in the Northeastern Gulf of Mexico. [Internet] [Doctoral dissertation]. Florida State University; 2013. [cited 2021 Mar 02]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8630 ;.

Council of Science Editors:

Santema M. Spatial and Temporal Dynamics of Dissolved Oxygen on the Shallow Shelf in the Northeastern Gulf of Mexico. [Doctoral Dissertation]. Florida State University; 2013. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8630 ;

Florida State University

16. Sauer, Jeremy A. Towards Improved Capability and Confidence in Coupled Atmospheric and Wildland Fire Modeling.

Degree: PhD, 2013, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8632 ;

►

This dissertation work is aimed at improving the capability and confidence in a modernized and improved version of Los Alamos National Laboratory's coupled atmospheric and… (more)

▼

This dissertation work is aimed at improving the capability and confidence in a modernized and improved version of Los Alamos National Laboratory's coupled atmospheric and wild- land fire dynamics model, Higrad-Firetec. Higrad is the hydrodynamics component of this large eddy simulation model that solves the three dimensional, fully compressible Navier- Stokes equations, incorporating a dynamic eddy viscosity formulation through a two-scale turbulence closure scheme. Firetec is the vegetation, drag forcing, and combustion physics portion that is integrated with Higrad. The modern version of Higrad-Firetec incorporates multiple numerical methodologies and high performance computing aspects which combine to yield a unique tool capable of augmenting theoretical and observational investigations in order to better understand the multi-scale, multi-phase, and multi-physics, phenomena in- volved in coupled atmospheric and environmental dynamics. More specifically, the current work includes extended functionality and validation efforts targeting component processes in coupled atmospheric and wildland fire scenarios. Since observational data of sufficient quality and resolution to validate the fully coupled atmosphere-wildfire scenario simply does not exist, we instead seek to validate components of the full prohibitively convoluted pro- cess. This manuscript provides first, an introduction and background into the application space of Higrad-Firetec. Second we document the model formulation, solution procedure, and a simple scalar transport verification exercise. Third, we perform a validate model results against observational data for time averaged flow field metrics in and above four idealized forest canopies. Fourth, we carry out a validation effort for the non-buoyant jet in a crossflow scenario (to which an analogy can be made for atmosphere-wildfire interactions) comparing model results to laboratory data of both steady-in-time and unsteady-in- time metrics. Finally, an extension of model multi-phase physics is implemented, allowing for the representation of multiple collocated fuels as separately evolving constituents lead- ing to differences resulting rate of spread and total burned area. In combination these efforts demonstrate improved capability, increased validation of component functionality, and unique applicability the Higrad-Firetec modeling framework. As a result this work provides a substantially more robust foundation for future new, more widely acceptable investigations into the complexities of coupled atmospheric and wildland fire behavior.

A Dissertation submitted to the Program in Geophysical Fluid Dynamics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

Fall Semester, 2013.

November 12, 2013.

Atmospheric, Collocated Fuels, Fuel Heterogeneity, Numerical Modeling, Wildfire

Doron Nof, Professor Directing Thesis; Eric Chicken, University Representative; Rodman R. Linn, Committee Member; Ming Ye, Committee Member; Ruby Krishnamurti, Committee Member.

Advisors/Committee Members: Doron Nof (professor directing thesis), Eric Chicken (university representative), Rodman R. Linn (committee member), Ming Ye (committee member), Ruby Krishnamurti (committee member).

Subjects/Keywords: Geophysics; Fluid dynamics

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APA (6^th Edition):

Sauer, J. A. (2013). Towards Improved Capability and Confidence in Coupled Atmospheric and Wildland Fire Modeling. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8632 ;

Chicago Manual of Style (16^th Edition):

Sauer, Jeremy A. “Towards Improved Capability and Confidence in Coupled Atmospheric and Wildland Fire Modeling.” 2013. Doctoral Dissertation, Florida State University. Accessed March 02, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-8632 ;.

MLA Handbook (7^th Edition):

Sauer, Jeremy A. “Towards Improved Capability and Confidence in Coupled Atmospheric and Wildland Fire Modeling.” 2013. Web. 02 Mar 2021.

Vancouver:

Sauer JA. Towards Improved Capability and Confidence in Coupled Atmospheric and Wildland Fire Modeling. [Internet] [Doctoral dissertation]. Florida State University; 2013. [cited 2021 Mar 02]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8632 ;.

Council of Science Editors:

Sauer JA. Towards Improved Capability and Confidence in Coupled Atmospheric and Wildland Fire Modeling. [Doctoral Dissertation]. Florida State University; 2013. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8632 ;

Florida State University

17. Dong, Jun. Water Mass Exchange Between the Weddell Gyre and the Antarctic Circumpolar Current.

Degree: PhD, 2012, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5344 ;

►

The Weddell Sea is a primary bottom water formation region, where newly formed bottom water is exported to all the ocean basins. This water mass… (more)

▼

The Weddell Sea is a primary bottom water formation region, where newly formed bottom water is exported to all the ocean basins. This water mass is partly supplied from the upper layers of the Antarctic Circumpolar Current (ACC), as well as from sources within the Antarctic Slope Current (ASC). In addition to the mean meridional overturning circulation (MOC) in the Weddell Gyre, observations support the idea that the water mass exchange between the Weddell Gyre and the ACC is also due to two other mechanisms, meso-scale eddies and large-scale fluctuations in forcing. The Ocean model and Lagrangian method are used to study the water mass exchange by these mechanisms. For the exchange caused by large-scale fluctuations, only the chaotic transport caused by the seasonal cycle (CTSC) is studied because of computational limitations. By the Lagrangian method, the three different mechanisms for water mass exchange are separately found. Based on the model, considering the Weddell Gyre as a whole system, the water mass exchange by the total velocity field is 10.9 Sv, of which 7.2 Sv is due to the mean velocity field, 1.3 Sv due to CTSC and 2.4 Sv due to eddies. In total, one third of the mass exchange is caused by the time-dependent part of the velocity field. According to the model, the transport of the ASC along 30°E is estimated as 4.2 Sv from the Antarctic coast northward to the 3000 m isobath, but only 1.0 Sv is from outside of the Weddell Gyre east of 94°E. The other 3.2 Sv transport is due to gyre circulation along the eastern boundary crossing 30°E, which then flows back along the Antarctic coast. Additionally, this work also shows the strength of the Lagrangian method in calculating water mass exchange.

A Dissertation submitted to the Geophysical Fluid Dynamics Institude in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

Fall Semester, 2012.

October 26, 2012.

Kevin Speer, Professor Directing Thesis; Eric Chassignet, University Representative; William Dewar, Committee Member; Doron Nof, Committee Member.

Advisors/Committee Members: Kevin Speer (professor directing thesis), Eric Chassignet (university representative), William Dewar (committee member), Doron Nof (committee member).

Subjects/Keywords: Geophysics; Fluid dynamics

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APA (6^th Edition):

Dong, J. (2012). Water Mass Exchange Between the Weddell Gyre and the Antarctic Circumpolar Current. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5344 ;

Chicago Manual of Style (16^th Edition):

Dong, Jun. “Water Mass Exchange Between the Weddell Gyre and the Antarctic Circumpolar Current.” 2012. Doctoral Dissertation, Florida State University. Accessed March 02, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-5344 ;.

MLA Handbook (7^th Edition):

Dong, Jun. “Water Mass Exchange Between the Weddell Gyre and the Antarctic Circumpolar Current.” 2012. Web. 02 Mar 2021.

Vancouver:

Dong J. Water Mass Exchange Between the Weddell Gyre and the Antarctic Circumpolar Current. [Internet] [Doctoral dissertation]. Florida State University; 2012. [cited 2021 Mar 02]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5344 ;.

Council of Science Editors:

Dong J. Water Mass Exchange Between the Weddell Gyre and the Antarctic Circumpolar Current. [Doctoral Dissertation]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5344 ;

Florida State University

18. Canfield, Jesse M. Wildfire Dynamics: Understanding Some Behavior Trends.

Degree: PhD, 2014, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8749 ;

► This dissertation explores wildfire dynamics. Chapters 2 and 3 are peer reviewed journal articles that present an understanding of three-dimensionality in grass fires and how… (more)

▼ This dissertation explores wildfire dynamics. Chapters 2 and 3 are peer reviewed journal articles that present an understanding of three-dimensionality in grass fires and how it affects forward rate of spread (ROS) of the fire. In Chapter 2 the numerical model HIGRAD/FIRETEC was used to give arguments supporting that modeling wildfire in a two-dimensional vertical and stream-wise plane does not represent all of the physics that are required to determine a meaningful forward ROS. Chapter 2 inspired the work that makes up chapter 3. In chapter 3, HIGRAD/FIRETEC was again used, to determine the effect that ignition line length has on forward ROS. In both chapters, finger shaped structures were present in the combusting fuels, upstream of the fire front. The fingers correlated with counter-rotating vortex pairs in the gas-phase above them. It was also shown that increasing ignition line length does indeed increase forward ROS, an expected result supported by previous investigations. Results were presented that suggest physical reasons why a spreading grass fire develops flanks that move forward slower than the front of the fire. Chapter 4 describes the gas phase in the planetary boundary layer (PBL), where fires and other phenomena occur. A muti-component gas phase model was derived that represents individual ideal gas species. The mass dependent nature of this model allows the individual species to have dynamic effects on the flow field. The multi-component model was then coupled to HIGRAD to explore three PBL scenarios. The purpose of the first case was to numerically spin-up a moist unstable PBL. The second case used the mixture model to look at a hypothetical scenario representative of the Las Conchas wildfire. In the second case, an idealized column of a gaseous mixture containing heat, dry air, water vapor, and fullerene was initialized over the topography where the Las Conchas fire occurred. The gas column represented an idealized fire plume. As predicted, the column collapsed under its own weight. However, parts of the column rose to higher elevations too. The third case was to use the results from the first case to model fugitive methane in an unstable PBL. In this case, a small amount of methane was fluxed into a grid cell on the bottom boundary of the spun-up, moist PBL from the first case. The evolution of the methane plume was and continues to be studied. Some preliminary results are presented where methane concentration is compared to data collected from a field experiment. Chapter 5 is the conclusion. In this chapter, the results from chapters 2, 3, and 4 are summarized. An analytical fire spread model is proposed that ties chapters 2 and 3 to chapter 4. This spread model is a two-layer, multi-phase set of governing equations. It is assumed that the gas phase is a thin layer relative to the horizontal. This thin layer contains laminar, diffusion flames. The vertical distance that the flames remain laminar and diffusive determines the thickness of the layer. In other words, the vertical distance from the… Advisors/Committee Members: Doron Nof (professor directing dissertation), Robert Hart (university representative), Kevin Speer (committee member), Brian Ewald (committee member), Allan Clarke (committee member), Ruby Krishnamurti (committee member), Rodman Linn (committee member), Carol Anne Clayson (committee member).

Subjects/Keywords: Geophysics; Fluid dynamics

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APA (6^th Edition):

Canfield, J. M. (2014). Wildfire Dynamics: Understanding Some Behavior Trends. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8749 ;

Chicago Manual of Style (16^th Edition):

Canfield, Jesse M. “Wildfire Dynamics: Understanding Some Behavior Trends.” 2014. Doctoral Dissertation, Florida State University. Accessed March 02, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-8749 ;.

MLA Handbook (7^th Edition):

Canfield, Jesse M. “Wildfire Dynamics: Understanding Some Behavior Trends.” 2014. Web. 02 Mar 2021.

Vancouver:

Canfield JM. Wildfire Dynamics: Understanding Some Behavior Trends. [Internet] [Doctoral dissertation]. Florida State University; 2014. [cited 2021 Mar 02]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8749 ;.

Council of Science Editors:

Canfield JM. Wildfire Dynamics: Understanding Some Behavior Trends. [Doctoral Dissertation]. Florida State University; 2014. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8749 ;

Florida State University

19. Paget, Aaron C. Important Contributing Factors for Estimating the Active and Total Whitecap Coverage Globally Using Satellite-Derived Parameters.

Degree: PhD, 2013, Florida State University

URL: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7539 ;

►

This study identifies the major contributing factors in estimating whitecap coverage globally from satellite observations. Power law functions for estimating both the active and total… (more)

▼

This study identifies the major contributing factors in estimating whitecap coverage globally from satellite observations. Power law functions for estimating both the active and total whitecap coverage from in situ observations are derived using U10 (in situ winds) and U10EN (satellite-reported equivalent neutral winds). Whitecap coverage estimates using U10EN and a power law reproduced in situ whitecap estimates better than using U10 and a power law, but, when compared with the satellite-based whitecap observations from the Whitecap Database, neither can adequately estimate the whitecap. New power law coefficients using U10EN, available in the Whitecap Database, are presented and estimates are compared to the active and total whitecap coverage from the Whitecap Database. An additional 17 parameters, independent of U10EN, are tested to determine their roles in influencing whitecap formation and duration using a modified power law; the most influential parameters are identified. The most influential parameters for the active whitecap coverage include SST, orbital velocity, air temperature, fetch, and the cross SST gradient wind; the most influential parameters for the total whitecap coverage include SST, orbital velocity, air temperature, air-sea temperature differential, and the cross SST gradient wind. Sampling and performance ranking techniques to manage large datasets are presented along with function fitting techniques for a modified power law. The improved understanding of whitecap coverage aids in estimating whitecap coverage globally using satellite products and in determining the global effects of whitecaps on air-sea processes and remote sensing of the surface.

A Dissertation submitted to the Geophysical Fluid Dynamics Institute in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

Summer Semester, 2013.

April 26, 2013.

equivalent neutral wind, In Situ, Satellite, u10, Whitecap, wind

Mark A. Bourassa, Professor Directing Dissertation; Guosheng Liu, University Representative; Doron Nof, Committee Member; Allan J. Clarke, Committee Member.

Advisors/Committee Members: Mark A. Bourassa (professor directing dissertation), Guosheng Liu (university representative), Doron Nof (committee member), Allan J. Clarke (committee member).

Subjects/Keywords: Geophysics; Fluid dynamics

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APA (6^th Edition):

Paget, A. C. (2013). Important Contributing Factors for Estimating the Active and Total Whitecap Coverage Globally Using Satellite-Derived Parameters. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-7539 ;

Chicago Manual of Style (16^th Edition):

Paget, Aaron C. “Important Contributing Factors for Estimating the Active and Total Whitecap Coverage Globally Using Satellite-Derived Parameters.” 2013. Doctoral Dissertation, Florida State University. Accessed March 02, 2021. http://purl.flvc.org/fsu/fd/FSU_migr_etd-7539 ;.

MLA Handbook (7^th Edition):

Paget, Aaron C. “Important Contributing Factors for Estimating the Active and Total Whitecap Coverage Globally Using Satellite-Derived Parameters.” 2013. Web. 02 Mar 2021.

Vancouver:

Paget AC. Important Contributing Factors for Estimating the Active and Total Whitecap Coverage Globally Using Satellite-Derived Parameters. [Internet] [Doctoral dissertation]. Florida State University; 2013. [cited 2021 Mar 02]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7539 ;.

Council of Science Editors:

Paget AC. Important Contributing Factors for Estimating the Active and Total Whitecap Coverage Globally Using Satellite-Derived Parameters. [Doctoral Dissertation]. Florida State University; 2013. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-7539 ;

20. Li, Larry. Forcing of globally unstable jets and flames.

Degree: PhD, 2012, University of Cambridge

URL: http://www.dspace.cam.ac.uk/handle/1810/242373https://www.repository.cam.ac.uk/bitstream/1810/242373/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/5/PhD_vfinal_LarryLi.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/6/PhD_vfinal_LarryLi.pdf.jpg

► In the analysis of thermoacoustic systems, a flame is usually characterised by the way its heat release responds to acoustic forcing. This response depends on… (more)

▼ In the analysis of thermoacoustic systems, a flame is usually characterised by the way its heat release responds to acoustic forcing. This response depends on the hydrodynamic stability of the flame. Some flames, such as a premixed bunsen flame, are hydrodynamically globally stable. They respond only at the forcing frequency. Other flames, such as a jet diffusion flame, are hydrodynamically globally unstable. They oscillate at their own natural frequencies and are often assumed to be insensitive to low-amplitude forcing at other frequencies. If a hydrodynamically globally unstable flame really is insensitive to forcing at other frequencies, then it should be possible to weaken thermoacoustic oscillations by detuning the frequency of the natural hydrodynamic mode from that of the natural acoustic modes. This would be very beneficial for industrial combustors. In this thesis, that assumption of insensitivity to forcing is tested experimentally. This is done by acoustically forcing two different selfexcited flows: a non-reacting jet and a reacting jet. Both jets have regions of absolute instability at their base and this causes them to exhibit varicose oscillations at discrete natural frequencies. The forcing is applied around these frequencies, at varying amplitudes, and the response examined over a range of frequencies (not just at the forcing frequency). The overall system is then modelled as a forced van der Pol oscillator. The results show that, contrary to some expectations, a hydrodynamically self-excited jet oscillating at one frequency is sensitive to forcing at other frequencies. When forced at low amplitudes, the jet responds at both frequencies as well as at several nearby frequencies, and there is beating, indicating quasiperiodicity. When forced at high amplitudes, however, it locks into the forcing. The critical forcing amplitude required for lock-in increases with the deviation of the forcing frequency from the natural frequency. This increase is linear, indicating a Hopf bifurcation to a global mode. The lock-in curve has a characteristic ∨ shape, but with two subtle asymmetries about the natural frequency. The first asymmetry concerns the forcing amplitude required for lock-in. In the non-reacting jet, higher amplitudes are required when the forcing frequency is above the natural frequency. In the reacting jet, lower amplitudes are required when the forcing frequency is above the natural frequency. The second asymmetry concerns the broadband response at lock-in. In the non-reacting jet, this response is always weaker than the unforced response, regardless of whether the forcing frequency is above or below the natural frequency. In the reacting jet, that response is weaker than the unforced response when the forcing frequency is above the natural frequency, but is stronger than it when the forcing frequency is below the natural frequency. In the reacting jet, weakening the global instability – by adding coflow or by diluting the fuel mixture – causes the…

Subjects/Keywords: Fluid dynamics; Combustion

9 more images…

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APA (6^th Edition):

Li, L. (2012). Forcing of globally unstable jets and flames. (Doctoral Dissertation). University of Cambridge. Retrieved from http://www.dspace.cam.ac.uk/handle/1810/242373https://www.repository.cam.ac.uk/bitstream/1810/242373/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/5/PhD_vfinal_LarryLi.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/6/PhD_vfinal_LarryLi.pdf.jpg

Chicago Manual of Style (16^th Edition):

Li, Larry. “Forcing of globally unstable jets and flames.” 2012. Doctoral Dissertation, University of Cambridge. Accessed March 02, 2021. http://www.dspace.cam.ac.uk/handle/1810/242373https://www.repository.cam.ac.uk/bitstream/1810/242373/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/5/PhD_vfinal_LarryLi.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/6/PhD_vfinal_LarryLi.pdf.jpg.

MLA Handbook (7^th Edition):

Li, Larry. “Forcing of globally unstable jets and flames.” 2012. Web. 02 Mar 2021.

Vancouver:

Li L. Forcing of globally unstable jets and flames. [Internet] [Doctoral dissertation]. University of Cambridge; 2012. [cited 2021 Mar 02]. Available from: http://www.dspace.cam.ac.uk/handle/1810/242373https://www.repository.cam.ac.uk/bitstream/1810/242373/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/5/PhD_vfinal_LarryLi.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/6/PhD_vfinal_LarryLi.pdf.jpg.

Council of Science Editors:

Li L. Forcing of globally unstable jets and flames. [Doctoral Dissertation]. University of Cambridge; 2012. Available from: http://www.dspace.cam.ac.uk/handle/1810/242373https://www.repository.cam.ac.uk/bitstream/1810/242373/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/5/PhD_vfinal_LarryLi.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/242373/6/PhD_vfinal_LarryLi.pdf.jpg

Florida Atlantic University

21. Rodriguez, Daniel. Emission characteristics of a liquid spray sudden expansion combustor using computational fluid dynamics.

Degree: M.S.C.S., 2013, Florida Atlantic University

URL: http://purl.flvc.org/fcla/dt/3362574

►

Summary: A sudden expansion combustor (SUE) is analyzed using computation fluid dynamics (CFD). CO emissions and NOx emissions are computed for various operating conditions of… (more)

Subjects/Keywords: Fluid dynamics – Data processing; Fluid dynamics – Mathematical models; Computational fluid dynamics; Diffusers – Fluid dynamics

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APA (6^th Edition):

Rodriguez, D. (2013). Emission characteristics of a liquid spray sudden expansion combustor using computational fluid dynamics. (Masters Thesis). Florida Atlantic University. Retrieved from http://purl.flvc.org/fcla/dt/3362574

Chicago Manual of Style (16^th Edition):

Rodriguez, Daniel. “Emission characteristics of a liquid spray sudden expansion combustor using computational fluid dynamics.” 2013. Masters Thesis, Florida Atlantic University. Accessed March 02, 2021. http://purl.flvc.org/fcla/dt/3362574.

MLA Handbook (7^th Edition):

Rodriguez, Daniel. “Emission characteristics of a liquid spray sudden expansion combustor using computational fluid dynamics.” 2013. Web. 02 Mar 2021.

Vancouver:

Rodriguez D. Emission characteristics of a liquid spray sudden expansion combustor using computational fluid dynamics. [Internet] [Masters thesis]. Florida Atlantic University; 2013. [cited 2021 Mar 02]. Available from: http://purl.flvc.org/fcla/dt/3362574.

Council of Science Editors:

Rodriguez D. Emission characteristics of a liquid spray sudden expansion combustor using computational fluid dynamics. [Masters Thesis]. Florida Atlantic University; 2013. Available from: http://purl.flvc.org/fcla/dt/3362574

Clemson University

22. Zerfas, Camille. Numerical methods and analysis for continuous data assimilation in fluid models.

Degree: PhD, Mathematical Sciences, 2019, Clemson University

URL: https://tigerprints.clemson.edu/all_dissertations/2428

► Modeling fluid flow arises in many applications of science and engineering, including the design of aircrafts, prediction of weather, and oceanography. It is vital… (more)

Subjects/Keywords: Computational fluid dynamics

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APA (6^th Edition):

Zerfas, C. (2019). Numerical methods and analysis for continuous data assimilation in fluid models. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2428

Chicago Manual of Style (16^th Edition):

Zerfas, Camille. “Numerical methods and analysis for continuous data assimilation in fluid models.” 2019. Doctoral Dissertation, Clemson University. Accessed March 02, 2021. https://tigerprints.clemson.edu/all_dissertations/2428.

MLA Handbook (7^th Edition):

Zerfas, Camille. “Numerical methods and analysis for continuous data assimilation in fluid models.” 2019. Web. 02 Mar 2021.

Vancouver:

Zerfas C. Numerical methods and analysis for continuous data assimilation in fluid models. [Internet] [Doctoral dissertation]. Clemson University; 2019. [cited 2021 Mar 02]. Available from: https://tigerprints.clemson.edu/all_dissertations/2428.

Council of Science Editors:

Zerfas C. Numerical methods and analysis for continuous data assimilation in fluid models. [Doctoral Dissertation]. Clemson University; 2019. Available from: https://tigerprints.clemson.edu/all_dissertations/2428

University of Akron

23. Crowder, Matthew. RHEOLOGICAL ANALYSIS OF UNCROSSLINKED RUBBER COMPOUNDS AND THE CHARACTERIZATION OF AN APPARATUS FOR FORMING AN ELASTOMERIC STRIP.

Degree: MSin Polymer Engineering, Polymer Engineering, 2017, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1490831132166305

► Filled rubber compounds contain a blend of polymers, plasticizers, fillers, antioxidants, tackifiers, curatives and waxes. The chemical, fluid and solid properties of the rubber are… (more)

▼ Filled rubber compounds contain a blend of polymers, plasticizers, fillers, antioxidants, tackifiers, curatives and waxes. The chemical, fluid and solid properties of the rubber are affected by the types of materials included in the compound and the relative quantity of each. In the tire industry, compounds are developed possessing specific solid properties to achieve desired product performance. The following study includes an analysis of the rheological behavior of natural and synthetic rubber compounds containing carbon black and silica fillers, during an extrusion process, while heated until softened. All materials studied were thermosetting polymers, in an un-cured state. The apparatus used in the extrusion process was composed of a cold feed extruder in series with a gear pump supplying a flow channel of heated boundaries terminating with a small roller die used to form an elastomeric strip. Material properties studied during the extrusion process include the pressure required to achieve a specific flow rate, and the materials’ bulk and surface temperatures inside the flow channel and at the die exit. The goal of the study is the development of a method for predicting the process responses as a function of material properties, die geometry, and material flow rate.First, capillary rheometer experiments were conducted to characterize the materials’ viscosity and identify the constants of the power-law viscosity model for each material. Die swell measurements were made during the capillary experiments to understand the materials elasticity. Once the resistance to flow had been determined, analytical models for pressure drop and viscous heating were explored, achieving incomplete results using equations for pressure drop with power-law fluids in straight and converging tubes. For this purpose, methods developed by Flumerfelt et al. were employed for achieving analytical solutions for generalized plane Couette flow of non-Newtonian fluids. Due to limited success with analytical methods, experimental trials were designed and conducted to acquire response data to which empirical models could be fit. Empirical models were developed using a statistical software package to create a multiple linear regression analysis for each response using the independent variables known to be contributors to the pressure drop and heating of materials as identified in the analytical portion of the study. The models developed proved to be accurate in the prediction of extrudate bulk and surface temperatures and moderately accurate in predicting pressure in the flow channel. Advisors/Committee Members: Sancaktar, Erol (Advisor), Cavicchi, Kevin (Committee Chair).

Subjects/Keywords: Polymers; Fluid Dynamics

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APA (6^th Edition):

Crowder, M. (2017). RHEOLOGICAL ANALYSIS OF UNCROSSLINKED RUBBER COMPOUNDS AND THE CHARACTERIZATION OF AN APPARATUS FOR FORMING AN ELASTOMERIC STRIP. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1490831132166305

Chicago Manual of Style (16^th Edition):

Crowder, Matthew. “RHEOLOGICAL ANALYSIS OF UNCROSSLINKED RUBBER COMPOUNDS AND THE CHARACTERIZATION OF AN APPARATUS FOR FORMING AN ELASTOMERIC STRIP.” 2017. Masters Thesis, University of Akron. Accessed March 02, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1490831132166305.

MLA Handbook (7^th Edition):

Crowder, Matthew. “RHEOLOGICAL ANALYSIS OF UNCROSSLINKED RUBBER COMPOUNDS AND THE CHARACTERIZATION OF AN APPARATUS FOR FORMING AN ELASTOMERIC STRIP.” 2017. Web. 02 Mar 2021.

Vancouver:

Crowder M. RHEOLOGICAL ANALYSIS OF UNCROSSLINKED RUBBER COMPOUNDS AND THE CHARACTERIZATION OF AN APPARATUS FOR FORMING AN ELASTOMERIC STRIP. [Internet] [Masters thesis]. University of Akron; 2017. [cited 2021 Mar 02]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1490831132166305.

Council of Science Editors:

Crowder M. RHEOLOGICAL ANALYSIS OF UNCROSSLINKED RUBBER COMPOUNDS AND THE CHARACTERIZATION OF AN APPARATUS FOR FORMING AN ELASTOMERIC STRIP. [Masters Thesis]. University of Akron; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1490831132166305

The Ohio State University

24. Ozcakir, Ozge. Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe.

Degree: PhD, Mathematics, 2014, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148

► We find a systematic approach to compute two-fold symmetric VW solutions through alternate azimuthal suction and injection on the boundary. For computational efficiency, number of… (more)

Subjects/Keywords: Mathematics; Fluid Dynamics

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APA (6^th Edition):

Ozcakir, O. (2014). Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148

Chicago Manual of Style (16^th Edition):

Ozcakir, Ozge. “Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe.” 2014. Doctoral Dissertation, The Ohio State University. Accessed March 02, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148.

MLA Handbook (7^th Edition):

Ozcakir, Ozge. “Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe.” 2014. Web. 02 Mar 2021.

Vancouver:

Ozcakir O. Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe. [Internet] [Doctoral dissertation]. The Ohio State University; 2014. [cited 2021 Mar 02]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148.

Council of Science Editors:

Ozcakir O. Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe. [Doctoral Dissertation]. The Ohio State University; 2014. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148

Rutgers University

25. Patel, Saumil B., 1992-. Evaluation of k − w turbulence model and Euler flux schemes for shock wave turbulent boundary layer interaction.

Degree: MS, Mechanical and Aerospace Engineering, 2018, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/57672/

► Shock-wave boundary-layer interaction (SBLI) has long been an important phenomenon in aerodynamics, from transonic through to hypersonic speeds. High-speed flow has been at the center… (more)

Subjects/Keywords: Computational fluid dynamics

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APA (6^th Edition):

Patel, Saumil B., 1. (2018). Evaluation of k − w turbulence model and Euler flux schemes for shock wave turbulent boundary layer interaction. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/57672/

Chicago Manual of Style (16^th Edition):

Patel, Saumil B., 1992-. “Evaluation of k − w turbulence model and Euler flux schemes for shock wave turbulent boundary layer interaction.” 2018. Masters Thesis, Rutgers University. Accessed March 02, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/57672/.

MLA Handbook (7^th Edition):

Patel, Saumil B., 1992-. “Evaluation of k − w turbulence model and Euler flux schemes for shock wave turbulent boundary layer interaction.” 2018. Web. 02 Mar 2021.

Vancouver:

Patel, Saumil B. 1. Evaluation of k − w turbulence model and Euler flux schemes for shock wave turbulent boundary layer interaction. [Internet] [Masters thesis]. Rutgers University; 2018. [cited 2021 Mar 02]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/57672/.

Council of Science Editors:

Patel, Saumil B. 1. Evaluation of k − w turbulence model and Euler flux schemes for shock wave turbulent boundary layer interaction. [Masters Thesis]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/57672/

Rutgers University

26. Balogh, Peter E., 1981-. The development and application of a computational method for modeling cellular-scale blood flow in complex geometry.

Degree: PhD, Mechanical and Aerospace Engineering, 2018, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/58893/

► A computational methodology for the direct numerical simulation of 3D cellular-scale blood flow in arbitrary and highly complex geometries is presented. The approach is based… (more)

▼ A computational methodology for the direct numerical simulation of 3D cellular-scale blood flow in arbitrary and highly complex geometries is presented. The approach is based on immersed boundary methods, which provide an efficient means of modeling flows in such geometries while simultaneously resolving the large deformation and dynamics of every blood cell with high fidelity. The present methodology seamlessly integrates different modeling components, from stationary rigid boundaries of complex shape, to moving rigid bodies, to highly deformable interfaces governed by nonlinear elasticity. Thus it enables the simulation of `whole' blood suspensions flowing through, for example, physiologically realistic microvascular networks that are characterized by multiple bifurcating and merging vessels, as well as geometrically complex lab-on-chip devices. The focus of this thesis is twofold: the development of such a versatile numerical tool, and the application of this tool to study blood flow in complex microvascular networks. Towards the first objective, after describing the methodology a series of validation studies are presented against analytical theory, experimental data, and previous numerical results. Then, the capability of the methodology is demonstrated by simulating flows of deformable blood cells and heterogeneous cell suspensions in a variety of highly complex and physiologically relevant geometries. In so doing it is shown that the methodology can predict several complex microhemodynamic phenomena. Towards the second objective, red blood cells (RBCs) are simulated flowing through realistic in vivo-like microvascular networks over a range of physiological conditions. Details are provided on the design of the networks, and an analysis of some general hemo- and hydro- dynamics is presented revealing several novel and unexpected phenomena. Next, an analysis of RBC partitioning at the network bifurcations is presented. At vascular bifurcations cells typically do not distribute to the daughter branches with the same proportion as the flow, which is important in physiology. Various aspects of such disproportionate partitioning are elucidated as it naturally arises in a complex network of multiple sequential bifurcations. Following this, an analysis of the cell free layer (CFL) in the simulated networks is presented. The CFL is a well known RBC-free plasma layer that forms near vessel walls in the microcirculation, and this provides the first simulation-based analysis of its 3D structure in complex in vivo-like networks, including hydrodynamic origins of the observed behavior. Lastly, a study is presented on the wall shear stress for the simulated vascular networks. The three-dimensional aspects of its highly varying nature are elucidated for the first time in a complex network. Additionally, the cellular influence on the wall shear stress as it arises in such geometries is isolated, quantitatively revealing the specific contribution of the cells. Overall, this work demonstrates that the present methodology is… Advisors/Committee Members: Bagchi, Prosenjit (chair), Knight, Doyle (internal member), Drazer, German (internal member), Sarkar, Kausik (outside member), School of Graduate Studies.

Subjects/Keywords: Computational fluid dynamics

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

APA (6^th Edition):

Balogh, Peter E., 1. (2018). The development and application of a computational method for modeling cellular-scale blood flow in complex geometry. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/58893/

Chicago Manual of Style (16^th Edition):

Balogh, Peter E., 1981-. “The development and application of a computational method for modeling cellular-scale blood flow in complex geometry.” 2018. Doctoral Dissertation, Rutgers University. Accessed March 02, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/58893/.

MLA Handbook (7^th Edition):

Balogh, Peter E., 1981-. “The development and application of a computational method for modeling cellular-scale blood flow in complex geometry.” 2018. Web. 02 Mar 2021.

Vancouver:

Balogh, Peter E. 1. The development and application of a computational method for modeling cellular-scale blood flow in complex geometry. [Internet] [Doctoral dissertation]. Rutgers University; 2018. [cited 2021 Mar 02]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/58893/.

Council of Science Editors:

Balogh, Peter E. 1. The development and application of a computational method for modeling cellular-scale blood flow in complex geometry. [Doctoral Dissertation]. Rutgers University; 2018. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/58893/

27. Storer, Benjamin. Development and Application of Models and Diagnostics for Geophysical Fluid Flows.

Degree: 2019, University of Waterloo

URL: http://hdl.handle.net/10012/14320

► This thesis presents the development and application of numerical tools for simulating and diagnosing quasi-geostrophic fluid systems. In this thesis we present a new numerical… (more)

▼ This thesis presents the development and application of numerical tools for simulating and diagnosing quasi-geostrophic fluid systems. In this thesis we present a new numerical model called SPIQG that is pseudo-spectral but also allows for a channel geometry and correctly computes the evolution of the zonal transport while maintaining spectral accuracy. There are numerous numerical models that simulate the non-linear evolution of the continuously stratified Quasi-Geostrophic (QG) system, and many of these models are pseudo-spectral in order to achieve high-order accuracy in the spatial discretization, but those typically assume a doubly-periodic geometry. SPIQG is built using the framework provided by SPINS, a spectral and parallel model for simulating the 3D incompressible, non-hydrostatic, Boussinesq Navier-Stokes equations. This framework provides powerful MPI-based parallelization in order to perform large-scale simulations in high powered computing environments. To validate this model, we present the results from various test cases, including quasi-geostrophic turbulence, jet destabilization, and vortex destabilization. The spectral accuracy allows for the total energy to be very well conserved as well as providing accurate calculation of power spectra, spectral fluxes, and anisotropy metrics. Next, we propose a spectrally computed diagnostic for spatial anisotropy: a measure of the extent to which a field exhibits a bias between different orientations. The diagnostic is presented in the framework of fluid dynamics, but can be applied to any field for which Parseval’s theorem applies and to which discrete Fourier, sine, or cosine transforms can be applied. The proposed metric provides both a local, or per-wavelength, measure of anisotropy, as well as a global measure. In order to determine when the anisotropy of a system is significant, the anisotropy of white noise is diagnosed both analytically and numerically. This reference anisotropy then provides a statistically sound method for determining if the observed field is significantly more or less anisotropic than noise. An idealized geophysical fluid dynamics simulation is used to illustrate the diagnostic power of the proposed metric. These tools are then applied to study the stability of lens-shaped vortices. We compute the stability characteristics with higher accuracy and for a wider range of Burger numbers (Bu) than what was previously done. It is found that there are four distinct Bu-regions of linear instability. Over the primary region of interest, 0.1 < Bu < 10, we confirm that the first and second azimuthal modes are the only linearly unstable modes, and they are associated with vortex tilting and tearing respectively. Moreover, the most unstable first azimuthal mode is not precisely captured by the linear stability analysis because of the extra condition that is imposed at the vortex centre, and accurate calculations of the second azimuthal mode requires higher resolution than was previously considered. We also study the non-linear…

Subjects/Keywords: Fluid dynamics; Computational fluid dynamics; Physical oceanography; Geophysical fluid dynamics

11 more images…

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APA (6^th Edition):

Storer, B. (2019). Development and Application of Models and Diagnostics for Geophysical Fluid Flows. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14320

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

Chicago Manual of Style (16^th Edition):

Storer, Benjamin. “Development and Application of Models and Diagnostics for Geophysical Fluid Flows.” 2019. Thesis, University of Waterloo. Accessed March 02, 2021. http://hdl.handle.net/10012/14320.

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

MLA Handbook (7^th Edition):

Storer, Benjamin. “Development and Application of Models and Diagnostics for Geophysical Fluid Flows.” 2019. Web. 02 Mar 2021.

Vancouver:

Storer B. Development and Application of Models and Diagnostics for Geophysical Fluid Flows. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10012/14320.

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

Council of Science Editors:

Storer B. Development and Application of Models and Diagnostics for Geophysical Fluid Flows. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14320

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

University of Johannesburg

28. Henning, Barend Jacobus. Aspects of fluid flow over vibrating bluff bodies.

Degree: 2012, University of Johannesburg

URL: http://hdl.handle.net/10210/7366

►

D.Ing.

The aim of this thesis is to research the use of Computational Fluid Dynamics (CFD) as design tool to predict fluid flow across stationary… (more)

▼

D.Ing.

The aim of this thesis is to research the use of Computational Fluid Dynamics (CFD) as design tool to predict fluid flow across stationary and moving bluff bodies. The principle of moving meshes is introduced to move the body vertically with respect to time. The moving mesh idea is first tested on a square body with a coarse discretized flow domain for transient conditions. The results can be animated to see how the flow pattern and mesh change with time. The idea is then implemented on a cylinder with a very fine mesh to capture the build-up and dispersion of vortices being shed from the cylinder as it moves cyclically for transient conditions. With this first approach a bluff body is forced to move cyclically with respect to time in cross flow. Many possibilities now exist to apply this idea further for other applications where forced vibration is important.The next approach is to use CFD to simulate flow-induced vibrations of bluff bodies. The pressure force on the bluff body is considered as a first approach to solve this problem. The inertia mass of the body balancing the effect of the pressure force on the body is first used, but the results indicate that damping and stiffness also have to be considered to obtain more realistic results. The effect of the pressure force on the body shows generally a downwards movement of the body for the first period of simulation and in the case of the square, after six time steps of the period of simulation the .pressure force switches to a positive value with resulting upwards movement of the body. The effect of the total force (shear + pressure) on a bluff body is not presented in this thesis. CFD as design tool is researched for various bundle configurations of cylinders. A new concept of split cylinders is researched and the best configuration obtained for various horizontal and vertical spacings of downstream- and upstream cylinders and cylinder halves. Experimental results on cylinders in a - small scale wind tunnel are used to compare the numerical results with the obtained pressure distribution around a stationary cylinder and the concept of velocity distribution over and between a split cylinder. Further development of the numerical flow model is necessary to include elasticity and longer three dimensional spanwise lengths of the object to obtain predictions of real flow-induced vibrations of bluff bodies. This first approach of numerical predictions of flow across stationary and moving bluff bodies creates many possibilities of complementing experimental results and comparing the obtained results with each other.

Subjects/Keywords: Fluid dynamics – Mathematical models; Fluid mechanics

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APA (6^th Edition):

Henning, B. J. (2012). Aspects of fluid flow over vibrating bluff bodies. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/7366

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

Chicago Manual of Style (16^th Edition):

Henning, Barend Jacobus. “Aspects of fluid flow over vibrating bluff bodies.” 2012. Thesis, University of Johannesburg. Accessed March 02, 2021. http://hdl.handle.net/10210/7366.

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

MLA Handbook (7^th Edition):

Henning, Barend Jacobus. “Aspects of fluid flow over vibrating bluff bodies.” 2012. Web. 02 Mar 2021.

Vancouver:

Henning BJ. Aspects of fluid flow over vibrating bluff bodies. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/10210/7366.

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

Council of Science Editors:

Henning BJ. Aspects of fluid flow over vibrating bluff bodies. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/7366

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

Hong Kong University of Science and Technology

29. Cheung, Yin Nee. Dynamics of acoustically actuated droplet breakup and manipulation in a flow-focusing microfluidic device.

Degree: 2012, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-7521 ; https://doi.org/10.14711/thesis-b1176706 ; http://repository.ust.hk/ir/bitstream/1783.1-7521/1/th_redirect.html

► Droplets of sizes in the range of micro- to nano-scales found many applications in biomedical industry, food processing industry, chemical and mechanical engineering. Control on… (more)

▼ Droplets of sizes in the range of micro- to nano-scales found many applications in biomedical industry, food processing industry, chemical and mechanical engineering. Control on the size of droplets produced in microfluidic devices can be achieved through passive (only controlled by the flow fields of the two immiscible fluids) and active methods (external actuation provided). The present work focuses on the investigation of a novel method with the incorporation of a piezoelectric actuator to control the droplet formation process in a flow-focusing device. Acoustic actuation causes a boundary-induced microstreaming flow in the two immiscible fluids at the cross-junction of the device. The scale of the microstreaming flow is within the Stokes layer and is periodic in nature. Phase-resolved micro-particle-image-velocity (μPIV) is applied for extracting the global, phase-averaged and periodic components from the microstreaming flow. Vibrating fluid-fluid interfaces are observed and acoustic actuation causes a reduction in the droplet size. Characterization of droplet formation under acoustic actuation is performed. The effects of the control parameters, flow rate ratio, voltage and frequency of acoustic actuation, continuous phases with different viscosities on droplet formation are characterized. Droplet size decreases with increase in the voltage and frequency of acoustic actuation. Continuous phases with higher viscosities cause a restrained vibration motion at the fluid-fluid interface with a reduced extent of vibration. Since droplet formation mainly depends on the extent of the vibration motion, acoustic actuation is more effective in affecting the breakup of droplets in a continuous phase with a lower viscosity. The evolution of the interfacial curvature during the whole droplet formation process in a flow-focusing device is investigated. Two critical curvature values that determine the detachment of liquid thread from walls of orifice and the onset of pinch-off are identified. The rate of evolution mainly depends on the flow rates of the two immiscible fluids and the flow through the gap between the liquid thread and the walls of the orifice. Acoustic actuation reduces the time for triggering the onset of pinch-off as the vibrating interface hinders the process of relaxation of interfacial energy and making pinch-off easier to trigger. Keywords: droplet formation dynamics, immiscible microfluidics, micro-particle-image-velocimetry (μPIV), acoustofluidics, microchannel flow, microelectromechanical systems (MEMS)

Subjects/Keywords: Microfluidic devices ; Drops – Fluid dynamics ; Fluid mechanics

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APA (6^th Edition):

Cheung, Y. N. (2012). Dynamics of acoustically actuated droplet breakup and manipulation in a flow-focusing microfluidic device. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7521 ; https://doi.org/10.14711/thesis-b1176706 ; http://repository.ust.hk/ir/bitstream/1783.1-7521/1/th_redirect.html

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

Chicago Manual of Style (16^th Edition):

Cheung, Yin Nee. “Dynamics of acoustically actuated droplet breakup and manipulation in a flow-focusing microfluidic device.” 2012. Thesis, Hong Kong University of Science and Technology. Accessed March 02, 2021. http://repository.ust.hk/ir/Record/1783.1-7521 ; https://doi.org/10.14711/thesis-b1176706 ; http://repository.ust.hk/ir/bitstream/1783.1-7521/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Cheung, Yin Nee. “Dynamics of acoustically actuated droplet breakup and manipulation in a flow-focusing microfluidic device.” 2012. Web. 02 Mar 2021.

Vancouver:

Cheung YN. Dynamics of acoustically actuated droplet breakup and manipulation in a flow-focusing microfluidic device. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2012. [cited 2021 Mar 02]. Available from: http://repository.ust.hk/ir/Record/1783.1-7521 ; https://doi.org/10.14711/thesis-b1176706 ; http://repository.ust.hk/ir/bitstream/1783.1-7521/1/th_redirect.html.

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

Council of Science Editors:

Cheung YN. Dynamics of acoustically actuated droplet breakup and manipulation in a flow-focusing microfluidic device. [Thesis]. Hong Kong University of Science and Technology; 2012. Available from: http://repository.ust.hk/ir/Record/1783.1-7521 ; https://doi.org/10.14711/thesis-b1176706 ; http://repository.ust.hk/ir/bitstream/1783.1-7521/1/th_redirect.html

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

Iowa State University

30. Nadeem, Hannan. An investigation of droplet growth and phase separation in an oil and water emulsion under controlled shear and temperature conditions.

Degree: 2020, Iowa State University

URL: https://lib.dr.iastate.edu/etd/18192

► Many researchers in the food and pharmaceutical industry have emphasized the importance of emulsion stability, and the need for stability tests. However, the emulsion stability… (more)

▼ Many researchers in the food and pharmaceutical industry have emphasized the importance of emulsion stability, and the need for stability tests. However, the emulsion stability tests can take a long time before meaningful results can be obtained. Therefore, there is a need for accelerated emulsion stability tests, and there aren’t many research studies for it. For this research, an oil in water type emulsion’s stability is studied primarily using optical methods. The effects of shear strain and temperature on phase separation, droplet growth, and emulsion’s physical characteristics are reported. The Taylor Couette flow reactor is used to detect the onset of phase separation. Optical microscopy is used to confirm that the droplet growth is due to coalescence, which leads to complete phase separation. Laboratory equipment and apparatus are used to measure and record emulsion’s physical characteristics like viscosity, interfacial tension, and density. To detect the onset of phase separation as a function of time, the emulsion is tested at a temperature range of 25 °C to 35 °C and a shear strain range of 10.5 s-1to 62.8 s-1. At some experimental conditions, there was no phase separation detected, labeled as stable cases. Cases where phase separation is detected, are labeled as separated cases. A boundary is fitted to segregate the experimental conditions that lead to stable cases from the conditions leading to separated cases with the help of dimensionless parameters, Eotvos, and Galilei numbers. The boundary line decreases linearly as the shear strain rate increases from 10.5 s-1to 47.1 s-1. For shear strain rates, higher than 47.1 s-1, the boundary line decreases exponentially as there is a drastic drop in viscosity of the emulsion. Through viscosity measurements, it is confirmed that the emulsion is Non-Newtonian fluid, and the interfacial tension also decreases with increasing temperature.The research presented is valid for the investigation of emulsion stability characteristics. The results will help Pfizer Inc. to understand this emulsion’s stability and help them with the manufacturing process design.

Subjects/Keywords: Emulsions; Fluid dynamics; Fluid mechanics; Phase separation

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APA (6^th Edition):

Nadeem, H. (2020). An investigation of droplet growth and phase separation in an oil and water emulsion under controlled shear and temperature conditions. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/18192

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

Chicago Manual of Style (16^th Edition):

Nadeem, Hannan. “An investigation of droplet growth and phase separation in an oil and water emulsion under controlled shear and temperature conditions.” 2020. Thesis, Iowa State University. Accessed March 02, 2021. https://lib.dr.iastate.edu/etd/18192.

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

MLA Handbook (7^th Edition):

Nadeem, Hannan. “An investigation of droplet growth and phase separation in an oil and water emulsion under controlled shear and temperature conditions.” 2020. Web. 02 Mar 2021.

Vancouver:

Nadeem H. An investigation of droplet growth and phase separation in an oil and water emulsion under controlled shear and temperature conditions. [Internet] [Thesis]. Iowa State University; 2020. [cited 2021 Mar 02]. Available from: https://lib.dr.iastate.edu/etd/18192.

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

Council of Science Editors:

Nadeem H. An investigation of droplet growth and phase separation in an oil and water emulsion under controlled shear and temperature conditions. [Thesis]. Iowa State University; 2020. Available from: https://lib.dr.iastate.edu/etd/18192

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

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