subject:(cfd model)

Delft University of Technology

1. Chit Yan Toe, Chit (author). Issues in Numerical Modelling and Assessing the Flow over Weirs and Groynes.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:583b10c5-5295-4a42-a265-2e0f98607b41

► In this research two problem statements are defined, namely (1) the validity of the assumption that groynes and weirs are equivalent in hydraulic models, and… (more)

▼ In this research two problem statements are defined, namely (1) the validity of the assumption that groynes and weirs are equivalent in hydraulic models, and (2) the difficulty of modelling groynes and weirs in the 3D numerical solver package OpenFOAM. Using the incompressible 3D Navier-Stokes equations solver for multiphase phase flows, the so-called interFoam solver un- der OpenFOAM framework, two different models are set up for tackling the two problem statements. The interFoam evaluation model addressed the issues of computational mesh types which affect the simulation results, and the methods for regulation of water level at the downstream boundary. The two types of the meshes which are used in the research are structured non-orthogonal mesh and unstructured more-orthogonal mesh. The benchmark test is the flow over the weir in the flume. The use of a non-orthogonal mesh could simulate the flow separation which is found downstream of the weir. However the unstructured meshes which are composed of more orthogonal parts and less non-orthogonal parts, could not reproduce the flow separation in 2D simulations correctly for high and small specific discharges. For the 3D simulations, the unstructured meshes apparently simulate the correct flow profile for low specific discharges. In this interFoam evaluation model the control structure or gate is used for maintaining the water level at the downstream boundary. In other words, it uses the physical method of water level boundary condition. The weir-groyne comparison model is developed with different settings from the former model for the assessment of the differences between weirs and groynes in open-channel flumes. The water level is regulated by a trial-and-error discharge adjustment method making use of inlet and outlet tanks. The mesh type used is the unstructured more-orthogonal mesh in 3D simulations since the severely non-orthogonal meshes introduce numerical artifacts. A variety of weirs and groynes with different slopes are simulated for the comparison of energy losses and streamlines patterns. From the simulation results, the streamlines of the flow over the weir and the groyne are found to be different and the energy head losses also differ between these two structures. For recommendations, to evaluate the skill of the interFoam solver the 3D simulations for unstructured meshes should be carried out to make sure that they can reproduce the flow sep- aration correctly. The use of a mathematical boundary condition for defining the water level is recommended to avoid the extra computational power for the control structure. To acquire the knowledge of flow around groynes and weirs, the experimental set-ups are recommended, and well-proved non-linear k − ε and k − ω turbulence closure models should be applied in the numerical modellings. Advisors/Committee Members: Mosselman, Erik (mentor), Uijttewaal, Wim (graduation committee), Sloff, Kees (graduation committee), Rutten, Martine (graduation committee), Mohamed, Y (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: interFoam; groynes; weirs; CFD model

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APA (6^th Edition):

Chit Yan Toe, C. (. (2018). Issues in Numerical Modelling and Assessing the Flow over Weirs and Groynes. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:583b10c5-5295-4a42-a265-2e0f98607b41

Chicago Manual of Style (16^th Edition):

Chit Yan Toe, Chit (author). “Issues in Numerical Modelling and Assessing the Flow over Weirs and Groynes.” 2018. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:583b10c5-5295-4a42-a265-2e0f98607b41.

MLA Handbook (7^th Edition):

Chit Yan Toe, Chit (author). “Issues in Numerical Modelling and Assessing the Flow over Weirs and Groynes.” 2018. Web. 04 Mar 2021.

Vancouver:

Chit Yan Toe C(. Issues in Numerical Modelling and Assessing the Flow over Weirs and Groynes. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:583b10c5-5295-4a42-a265-2e0f98607b41.

Council of Science Editors:

Chit Yan Toe C(. Issues in Numerical Modelling and Assessing the Flow over Weirs and Groynes. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:583b10c5-5295-4a42-a265-2e0f98607b41

Brno University of Technology

2. Floková, Kateřina. Zjednodušené výpočtové modelování spalování biomasy na roštu: Simplified computational modelling of biomass grate combustion.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/6353

► The aim of this thesis is to assemble simplified computational 3D model for straw grate combustion, based on data provided by detailed computational 1D model.… (more)

Subjects/Keywords: výpočetní model; CFD; spalování; biomasa; computational model; CFD; combustion; biomass

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APA (6^th Edition):

Floková, K. (2019). Zjednodušené výpočtové modelování spalování biomasy na roštu: Simplified computational modelling of biomass grate combustion. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/6353

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):

Floková, Kateřina. “Zjednodušené výpočtové modelování spalování biomasy na roštu: Simplified computational modelling of biomass grate combustion.” 2019. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/6353.

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

MLA Handbook (7^th Edition):

Floková, Kateřina. “Zjednodušené výpočtové modelování spalování biomasy na roštu: Simplified computational modelling of biomass grate combustion.” 2019. Web. 04 Mar 2021.

Vancouver:

Floková K. Zjednodušené výpočtové modelování spalování biomasy na roštu: Simplified computational modelling of biomass grate combustion. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/6353.

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

Council of Science Editors:

Floková K. Zjednodušené výpočtové modelování spalování biomasy na roštu: Simplified computational modelling of biomass grate combustion. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/6353

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

Rochester Institute of Technology

3. Holsen, Lukas. A Computational flow model of oxygen and nitric oxide transport & reactions and the relation with glaucoma.

Degree: Mechanical Engineering, 2011, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5939

► The purpose of this project is to create a computational model of a precapillary arteriole network near the optic nerve head (ONH) using computational fluid… (more)

▼ The purpose of this project is to create a computational model of a precapillary arteriole network near the optic nerve head (ONH) using computational fluid dynamics modeling (CFD, Fluent, ANSYS, Inc.). The CFD analysis will contain a blood flow model coupled with oxygen (O2) and nitric oxide (NO) transport and reactions. Until recently it was believed that elevated intraocular pressure (IOP) was causal in glaucoma, however recent studies demonstrate that glaucoma is associated with sensitivity to IOP itself. Because of this insight, other mechanisms besides mechanical damage that could cause glaucomatous neurodegeneration need to be explored, such as alterations in blood flow and oxygenation due to systemic changes. Excessive NO has often been associated with glaucoma and can cause increased vasodilation. NO has also been shown to have neurotoxic effects on the ONH when available in excess. NO generation mostly occurs within the endothelium and is directly related to the local oxygen concentration although there is considerable debate in the literature about the cause of surplus NO generation. Several theories exist attempting to explain this surplus production. One theory proposes that surplus NO is generated in ischemic regions within the choroid, the vascular layer of tissue that provides nutrient transport to different layers of the eye. Others suggest that the NO is produced due to reperfusion injuries and a third proposes the failure of autoregulation may cause the surplus NO. The relationship between these theories, IOP, and retinal ganglion cell (RGC) death (glaucoma), are not well understood. The purpose of this CFD model is to provide a quantitative framework for the analysis of blood flow and gas transport within the eye and to look at the contribution of ischemic regions, reperfusion injuries, and/or the failure of autoregulation leading to glaucomatous neurodegeneration. Concentrations and distributions of O2 and NO will be modeled throughout an arteriole network and surrounding tissue to predict what concentration is ultimately delivered to the ONH. This work will provide the preliminary quantitative framework that is needed to determine the role of excessive NO generation on glaucoma development and provide a framework for further species transport modeling in the eye. Advisors/Committee Members: Lamkin-Kennard, Kathleen.

Subjects/Keywords: CFD; Glaucoma; Network model; Nitric oxide; Transport

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

APA (6^th Edition):

Holsen, L. (2011). A Computational flow model of oxygen and nitric oxide transport & reactions and the relation with glaucoma. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5939

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):

Holsen, Lukas. “A Computational flow model of oxygen and nitric oxide transport & reactions and the relation with glaucoma.” 2011. Thesis, Rochester Institute of Technology. Accessed March 04, 2021. https://scholarworks.rit.edu/theses/5939.

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

MLA Handbook (7^th Edition):

Holsen, Lukas. “A Computational flow model of oxygen and nitric oxide transport & reactions and the relation with glaucoma.” 2011. Web. 04 Mar 2021.

Vancouver:

Holsen L. A Computational flow model of oxygen and nitric oxide transport & reactions and the relation with glaucoma. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Mar 04]. Available from: https://scholarworks.rit.edu/theses/5939.

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

Council of Science Editors:

Holsen L. A Computational flow model of oxygen and nitric oxide transport & reactions and the relation with glaucoma. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/5939

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

University of Toronto

4. Shahriari, Bijan. Development and Validation of a Partially Coupled Soot Model for Turbulent Kerosene Combustion in Industrial Applications.

Degree: 2014, University of Toronto

URL: http://hdl.handle.net/1807/68825

►

Soot emissions are by-products of combustion that are well documented to have adverse effects on human health and the environment. Consequently, these emissions are becoming… (more)

Subjects/Keywords: CFD; Combustion; Kerosene; Model; Soot; Turbulent; 0548

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APA (6^th Edition):

Shahriari, B. (2014). Development and Validation of a Partially Coupled Soot Model for Turbulent Kerosene Combustion in Industrial Applications. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/68825

Chicago Manual of Style (16^th Edition):

Shahriari, Bijan. “Development and Validation of a Partially Coupled Soot Model for Turbulent Kerosene Combustion in Industrial Applications.” 2014. Masters Thesis, University of Toronto. Accessed March 04, 2021. http://hdl.handle.net/1807/68825.

MLA Handbook (7^th Edition):

Shahriari, Bijan. “Development and Validation of a Partially Coupled Soot Model for Turbulent Kerosene Combustion in Industrial Applications.” 2014. Web. 04 Mar 2021.

Vancouver:

Shahriari B. Development and Validation of a Partially Coupled Soot Model for Turbulent Kerosene Combustion in Industrial Applications. [Internet] [Masters thesis]. University of Toronto; 2014. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1807/68825.

Council of Science Editors:

Shahriari B. Development and Validation of a Partially Coupled Soot Model for Turbulent Kerosene Combustion in Industrial Applications. [Masters Thesis]. University of Toronto; 2014. Available from: http://hdl.handle.net/1807/68825

AUT University

5. Al-Rawi, Mohammad. Computational fluid dynamic modelling for arterial diseases assessment .

Degree: 2013, AUT University

URL: http://hdl.handle.net/10292/5202

► One of the leading causes of death is cardiovascular disease, being 30% of all deaths worldwide and 40% of those in New Zealand. In other… (more)

▼ One of the leading causes of death is cardiovascular disease, being 30% of all deaths worldwide and 40% of those in New Zealand. In other words, every 90 minutes a New Zealander dies due to cardiovascular disease. Cardiovascular mortality is higher in New Zealand than Australia, but the reasons for this are not clear. Although Australia and New Zealand are similar politically, culturally, and socioeconomically, mortality from cardiovascular disease is about 25% higher in New Zealand than in Australia. In recent years, engineers and scientists have collaborated with the medical community to find new methods and approaches for assessing and investigating the development of cardiovascular diseases such as abdominal aortic aneurysm and atherosclerosis. In this thesis, atherosclerosis and aneurysm diseases are investigated and analysed using computational fluid dynamic/finite element (CFD/FE) methods. These models are validated against the in vivo and in vitro experiments performed on animals. The experimental models are also investigated; the assessment of arterial blockages using blood pressure waveforms obtained invasively at the right femoral artery. The animal experiments are performed following appropriate ethical protocols (R915) on Wistar rats weighing between 250-350g. An arterial blockage is created surgically within the abdominal aorta of healthy animals to create an unhealthy condition. Blood pressure waveforms are measured by injecting catheter into the right femoral artery of the rat. These measurements are taken at the baseline (healthy condition) and at four different severities of arterial blockage of the abdominal aorta for the same specimen. In vivo and in vitro measurements of the arterial diameter and wall thickness are also taken using Magnetic Resonance Imaging (MRI) and microscopic techniques, respectively. These data are then input onto CFD/FE models in order to develop a new, non-invasive method of assessing arterial blockage. The experimental and computational results indicate that arterial blockages occurring within the abdominal aorta could be assessed, and the development of the disease diagnosed, very clearly and non-invasively at the right femoral artery. The findings of the animal model are then implemented in the human model for screening atherosclerosis and aneurysm at the brachial artery. These diseases are modelled and simulated in a 3D CFD/FE aorta geometry using the fluid–structure interaction (FSI) approach on the commercial software ANSYS®14.0. Literature blood flow waveform datum is assumed at the inlet and invasive catheter pulsatile pressure waveforms data is imposed at the four outlets of the aorta (provided by Green Lane Hospital under ethic approval number NTX/09/11/109). Correlations between the stress phase angle (SPA), augmentation index (AI), lumen diameter and blood pressure waveforms for various scenarios of diseased models are made and compared to the control model. The results show that CFD/FE models with different radii and thicknesses at the abdominal… Advisors/Committee Members: Al-Jumaily, Ahmed (advisor), Lowe, Andrew (advisor).

Subjects/Keywords: CFD/FE; Animal model; Arterial diseases

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APA (6^th Edition):

Al-Rawi, M. (2013). Computational fluid dynamic modelling for arterial diseases assessment . (Thesis). AUT University. Retrieved from http://hdl.handle.net/10292/5202

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):

Al-Rawi, Mohammad. “Computational fluid dynamic modelling for arterial diseases assessment .” 2013. Thesis, AUT University. Accessed March 04, 2021. http://hdl.handle.net/10292/5202.

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

MLA Handbook (7^th Edition):

Al-Rawi, Mohammad. “Computational fluid dynamic modelling for arterial diseases assessment .” 2013. Web. 04 Mar 2021.

Vancouver:

Al-Rawi M. Computational fluid dynamic modelling for arterial diseases assessment . [Internet] [Thesis]. AUT University; 2013. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10292/5202.

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

Council of Science Editors:

Al-Rawi M. Computational fluid dynamic modelling for arterial diseases assessment . [Thesis]. AUT University; 2013. Available from: http://hdl.handle.net/10292/5202

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

Brno University of Technology

6. Čavoj, Ondřej. Výpočet aerodynamických charakteristik vozidla s vybočením: Computation of vehicle aerodynamic characteristics.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/11244

► This Diploma thesis deals with CFD simulations of flow around vehicles subjected to a crosswind with MIRA Reference Car in three body shapes with a… (more)

Subjects/Keywords: aerodynamika; CFD; Fluent; referenční model MIRA; turbulentní model v2f; aerodynamics; CFD; Fluent; MIRA reference car; v2f turbulence model

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

APA (6^th Edition):

Čavoj, O. (2019). Výpočet aerodynamických charakteristik vozidla s vybočením: Computation of vehicle aerodynamic characteristics. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/11244

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):

Čavoj, Ondřej. “Výpočet aerodynamických charakteristik vozidla s vybočením: Computation of vehicle aerodynamic characteristics.” 2019. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/11244.

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

MLA Handbook (7^th Edition):

Čavoj, Ondřej. “Výpočet aerodynamických charakteristik vozidla s vybočením: Computation of vehicle aerodynamic characteristics.” 2019. Web. 04 Mar 2021.

Vancouver:

Čavoj O. Výpočet aerodynamických charakteristik vozidla s vybočením: Computation of vehicle aerodynamic characteristics. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/11244.

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

Council of Science Editors:

Čavoj O. Výpočet aerodynamických charakteristik vozidla s vybočením: Computation of vehicle aerodynamic characteristics. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/11244

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

Brno University of Technology

7. Babička Fialová, Dominika. Distribuce toku v zařízeních s hustými svazky trubek: Flow Distribution in Equipment with Dense Tube Bundles.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/66702

► Significant maldistribution negatively influences performance of equipment containing dense tube bundles and, moreover, it can cause a wide range of operating issues. This thesis therefore… (more)

Subjects/Keywords: CFD; distribuce toku; hustý svazek trubek; tlaková ztráta; zjednodušený 3D CFD model; CFD; flow distribution; dense tube bundle; pressure drop; simplified 3D CFD model

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APA (6^th Edition):

Babička Fialová, D. (2018). Distribuce toku v zařízeních s hustými svazky trubek: Flow Distribution in Equipment with Dense Tube Bundles. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/66702

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):

Babička Fialová, Dominika. “Distribuce toku v zařízeních s hustými svazky trubek: Flow Distribution in Equipment with Dense Tube Bundles.” 2018. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/66702.

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

MLA Handbook (7^th Edition):

Babička Fialová, Dominika. “Distribuce toku v zařízeních s hustými svazky trubek: Flow Distribution in Equipment with Dense Tube Bundles.” 2018. Web. 04 Mar 2021.

Vancouver:

Babička Fialová D. Distribuce toku v zařízeních s hustými svazky trubek: Flow Distribution in Equipment with Dense Tube Bundles. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/66702.

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

Council of Science Editors:

Babička Fialová D. Distribuce toku v zařízeních s hustými svazky trubek: Flow Distribution in Equipment with Dense Tube Bundles. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/66702

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

Brno University of Technology

8. Rebej, Miroslav. Zjednodušené modelování distribuce toku: Simplified flow distribution modelling.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/175371

► The focus of this master’s thesis is modelling of fluid flow in parallel distribution systems where the uniformity of fluid distribution plays an important role.… (more)

Subjects/Keywords: distribuce toku; trubkový svazek; uspořádání toku; výpočtová dynamika tekutin; CFD; zjednodušený CFD model; flow distribution; tube bundle; flow arrangement; computational fluid dynamics; CFD; simplified CFD model

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

APA (6^th Edition):

Rebej, M. (2019). Zjednodušené modelování distribuce toku: Simplified flow distribution modelling. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/175371

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):

Rebej, Miroslav. “Zjednodušené modelování distribuce toku: Simplified flow distribution modelling.” 2019. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/175371.

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

MLA Handbook (7^th Edition):

Rebej, Miroslav. “Zjednodušené modelování distribuce toku: Simplified flow distribution modelling.” 2019. Web. 04 Mar 2021.

Vancouver:

Rebej M. Zjednodušené modelování distribuce toku: Simplified flow distribution modelling. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/175371.

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

Council of Science Editors:

Rebej M. Zjednodušené modelování distribuce toku: Simplified flow distribution modelling. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/175371

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

University of Windsor

9. Ciacci, Carlo. 1D Modelling and Analysis of Thermal Conditioning Systems for Electric Vehicles.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 2019, University of Windsor

URL: https://scholar.uwindsor.ca/etd/7779

► The limited driving range, due to the poor storage capability of electric batteries, represents one of the greatest challenges in the development of electric… (more)

▼ The limited driving range, due to the poor storage capability of electric batteries, represents one of the greatest challenges in the development of electric vehicles. This concern leads to an extremely demanding design of every component within the vehicle powertrain in order to achieve their maximum energy efficiency and decrease the demand on the battery. Additionally, in cold climate conditions, the efficiency of the heating system of an electric vehicle decreases and it can result in further reducing its driving range. In this thesis, 1D modelling in Amesim will be used to analyze different concepts of thermal management for an electric vehicle. Firstly, a 1D model of the original refrigeration system of the chosen vehicle (Fiat 500e) was built by implementing the data of each component. The components were individually modelled, then assembled within a system level model and the final model was validated. Secondly, starting with the validated system, a 1D model of a heat pump system was proposed as a replacement for the commonly used positive temperature coefficient heater (PTC). This model was obtained exploiting the information available on the refrigeration system and assuming all the unknown characteristics. An energy and exergy analysis was carried out to determine the individual components and overall system performance. Finally, the vehicle cabin was modelled exploiting a new Embedded CFD tool of Amesim capable of combining the advantages of 1D and 3D modelling, hence providing lower CPU resources and time consumption required to perform a simulation due to the lower effort to model the temperature distribution inside the cabin. This approach gives also the chance to study zonal heating and cooling of the cabin in order to reduce the energy demand on the battery. Numerous simulations were performed to analyze the impact of different settings and parameters validating each of them through comparison with experimental data. Advisors/Committee Members: Jianu, O.A..

Subjects/Keywords: Cabin model; Electric vehicle; Embedded CFD; Exergy; Heat pump model

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

APA (6^th Edition):

Ciacci, C. (2019). 1D Modelling and Analysis of Thermal Conditioning Systems for Electric Vehicles. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7779

Chicago Manual of Style (16^th Edition):

Ciacci, Carlo. “1D Modelling and Analysis of Thermal Conditioning Systems for Electric Vehicles.” 2019. Masters Thesis, University of Windsor. Accessed March 04, 2021. https://scholar.uwindsor.ca/etd/7779.

MLA Handbook (7^th Edition):

Ciacci, Carlo. “1D Modelling and Analysis of Thermal Conditioning Systems for Electric Vehicles.” 2019. Web. 04 Mar 2021.

Vancouver:

Ciacci C. 1D Modelling and Analysis of Thermal Conditioning Systems for Electric Vehicles. [Internet] [Masters thesis]. University of Windsor; 2019. [cited 2021 Mar 04]. Available from: https://scholar.uwindsor.ca/etd/7779.

Council of Science Editors:

Ciacci C. 1D Modelling and Analysis of Thermal Conditioning Systems for Electric Vehicles. [Masters Thesis]. University of Windsor; 2019. Available from: https://scholar.uwindsor.ca/etd/7779

10. Olofsson, Linus. Mass conservative network model for convective net flow in a complex urban geometry.

Degree: Physics, 2016, Umeå University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123270

► When simulating air flows in an urban environment, for e.g. pollutant dispersion investigations, today's main tool is advanced computational fluid dynamics simulations. These simulations… (more)

▼ When simulating air flows in an urban environment, for e.g. pollutant dispersion investigations, today's main tool is advanced computational fluid dynamics simulations. These simulations take a lot of time and resources to perform, even for small geometries. In some situations, one would like to be able to run approximate simulations, possibly with large geometries, without such a significant investment. The model described in this thesis is a graph network model which have streets and intersections of an urban environment modeled as connections and nodes in a graph. The model uses a pressured pipe model, based on the Darcy-Weisbach equation, to simulate air flow in the network. Such a model requires only rough measurements of the urban geometry and an estimated Darcy's friction factor, to be able to solve the system. Furthermore, using the same rough geometrical parameters, together with shear velocity, the model solves atmospheric exchange rates of the streets. Intersections play a major role when investigating urban dispersion. The way this model deals with dispersion in any complex intersections, represented by single nodes, is by using wind direction variance together with a distribution parameter based on computational fluid dynamics intersection simulations made in Comsol Multiphysics - also present in this paper. Using the simple model described above, I have simulated urban air flows in a complex urban geometry of a part of Paris. This specific geometry has already been investigated by computational fluid dynamics simulations as well as wind tunnel experiments. By comparing the computational fluid dynamics simulation with my model, I have validated its accuracy. 40% and 45% of all streets reach a relative and absolute error below 25% respectively. Directions of the street velocities have been simulated with approximately 90% accuracy - with distinct error indications. Atmospheric exchange rates of the streets are within an order of magnitude accurate, however, showing a systematic error by overestimating the vast majority of the exchange rates. The model could become even better by covering error sources discussed in the discussion section. Excess theory for simulating each of the above-described flows is presented, which might change the results. For example, slightly altering the modeling of the atmospheric exchange rate might fix the overestimation offset we have seen. Potential error sources could be the varying building heights and the streets angle relative the overlaying wind direction. The pressured pipe simulated flows have shown tendencies to be bad at picking up the effects of high/low buildings following low/high buildings, as well as accurately capture the behavior of streets close to perpendicular to the wind direction. Main streets with plenty of exits have been modeled with intersections at each exit, which results in strong flow variation along a street that should have a flow close to constant. Solving main streets like this separately could improve this…

Subjects/Keywords: Network model; Street canyons; Intersections; Urban dispersion; CFD data; CFD simulations; Atmospheric exchange

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APA (6^th Edition):

Olofsson, L. (2016). Mass conservative network model for convective net flow in a complex urban geometry. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123270

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):

Olofsson, Linus. “Mass conservative network model for convective net flow in a complex urban geometry.” 2016. Thesis, Umeå University. Accessed March 04, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123270.

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

MLA Handbook (7^th Edition):

Olofsson, Linus. “Mass conservative network model for convective net flow in a complex urban geometry.” 2016. Web. 04 Mar 2021.

Vancouver:

Olofsson L. Mass conservative network model for convective net flow in a complex urban geometry. [Internet] [Thesis]. Umeå University; 2016. [cited 2021 Mar 04]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123270.

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

Council of Science Editors:

Olofsson L. Mass conservative network model for convective net flow in a complex urban geometry. [Thesis]. Umeå University; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-123270

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

KTH

11. Askin, Muharrem Kemal. Calculations of Wind Turbine Flow in Yaw using the BEM Technique.

Degree: Heat and Power Technology, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187371

► The earlier EU-sponsored project MEXICO (model experiments in controlled conditions) provided a huge database for flows past an experimental rotor in standard and yaw… (more)

Subjects/Keywords: Yaw Model; Glauert’s Model; AL/NS Model; BEM; CFD; induction factor; tip loss correction

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APA (6^th Edition):

Askin, M. K. (2011). Calculations of Wind Turbine Flow in Yaw using the BEM Technique. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187371

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):

Askin, Muharrem Kemal. “Calculations of Wind Turbine Flow in Yaw using the BEM Technique.” 2011. Thesis, KTH. Accessed March 04, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187371.

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

MLA Handbook (7^th Edition):

Askin, Muharrem Kemal. “Calculations of Wind Turbine Flow in Yaw using the BEM Technique.” 2011. Web. 04 Mar 2021.

Vancouver:

Askin MK. Calculations of Wind Turbine Flow in Yaw using the BEM Technique. [Internet] [Thesis]. KTH; 2011. [cited 2021 Mar 04]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187371.

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

Council of Science Editors:

Askin MK. Calculations of Wind Turbine Flow in Yaw using the BEM Technique. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187371

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

Brno University of Technology

12. Šarlej, Marek. Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/5873

► This doctoral thesis focuses on modelling as an efficient tool in industrial practice in the field of power industry and environmental engineering. It represents the… (more)

Subjects/Keywords: modelování; CFD; odpady; biomasa; finanční model; peněžní tok; modeling; CFD; waste; biomass; financial model; cash-flow

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APA (6^th Edition):

Šarlej, M. (2018). Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/5873

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):

Šarlej, Marek. “Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects.” 2018. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/5873.

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

MLA Handbook (7^th Edition):

Šarlej, Marek. “Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects.” 2018. Web. 04 Mar 2021.

Vancouver:

Šarlej M. Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/5873.

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

Council of Science Editors:

Šarlej M. Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/5873

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

Brno University of Technology

13. Šarlej, Marek. Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects.

Degree: 2014, Brno University of Technology

URL: http://hdl.handle.net/11012/817

► This doctoral thesis focuses on modelling as an efficient tool in industrial practice in the field of power industry and environmental engineering. It represents the… (more)

Subjects/Keywords: modelování; CFD; odpady; biomasa; finanční model; peněžní tok; modeling; CFD; waste; biomass; financial model; cash-flow

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APA (6^th Edition):

Šarlej, M. (2014). Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/817

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):

Šarlej, Marek. “Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects.” 2014. Thesis, Brno University of Technology. Accessed March 04, 2021. http://hdl.handle.net/11012/817.

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

MLA Handbook (7^th Edition):

Šarlej, Marek. “Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects.” 2014. Web. 04 Mar 2021.

Vancouver:

Šarlej M. Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects. [Internet] [Thesis]. Brno University of Technology; 2014. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11012/817.

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

Council of Science Editors:

Šarlej M. Modelování jako účinný nástroj v průmyslové praxi a ekonomické aspekty: Modelling as Efficient Tool in Industrial Practice and Economic Aspects. [Thesis]. Brno University of Technology; 2014. Available from: http://hdl.handle.net/11012/817

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

McMaster University

14. Hale, Patrick. MULTI-MODELLING of ABRASIVE WATERJET MACHINING.

Degree: MASc, 2012, McMaster University

URL: http://hdl.handle.net/11375/12698

►

Abrasive waterjet (AWJ) machining is a complex, non-conventional machining process involving numerous input parameters including hydraulic, abrasive, mixing and cutting that must be accurately… (more)

▼

Abrasive waterjet (AWJ) machining is a complex, non-conventional machining process involving numerous input parameters including hydraulic, abrasive, mixing and cutting that must be accurately manipulated to guarantee precise cutting and quality. Currently, available models are empirical or require continuous calibration, or extensive experimental work. To reduce the calibration and experimental time required for accurate prediction of AWJ cutting, computational fluid dynamics (CFD) is being utilized to model the nozzle flow interaction; high pressure water is pushed through the orifice into the mixing chamber, pulling the abrasive into the flow and cohering in the focus tube. Initial research worked towards understanding the effect that input parameters - such as pressure, particle size and shape, focus tube length and volume fraction of air in fluid mixture - have on the velocity profile through the nozzle and upon exit to the atmosphere. Once understood, the CFD model can be utilized to vary mass-inlet, mixing head, orifice and focus tube dimensions to optimize velocity profile of abrasive material including magnitude and jet coherency. Primarily focused on pump pressure, which is limited by technology - an optimized AWJ nozzle will increase material removal rate and/or enhance cut quality without making changes to any other AWJM components. Utilizing the velocity output information from the CFD model, a depth of penetration erosion prediction model was generated. Based on methodology from Finnie, and modified by Hashish and ElTobgy, a multi-particle erosion model of an impacted work piece is developed. With an updated formulation for the specific cutting resistance of a work piece, dependent on particle velocity and nozzle traverse speed, the erosion prediction over the sixty-five different setups modelled and tested experimentally, reduced error on average 41.8%. Moreover, the development of this model created multi-layered surface plots, illustrating for quick reference, the erosion of a work piece for a given set of parameters albeit mass flow rate, pump pressure and traverse rate. Further, a database of quick reference guides, including variable input settings, nozzle types, garnet types and work piece materials can easily be developed. Finally, a new methodology for the leading edge of the waterjet is described and can be incorporated into the erosion simulation by making use of the ``top-hat`` profile generated in the CFD model. This would reduce reliance on model constants to account for secondary cutting, or when particles do not contribute to cutting but are simply entrained in the fluid flow. Both models demonstrated good correlation with experiments or literature. The use of these models will increase understanding of the complex abrasive waterjet process and reduce the need for costly experiments moving forward.

Master of Applied Science (MASc)

Advisors/Committee Members: Ng, Eu-Gene, Mechanical Engineering.

Subjects/Keywords: Abrasive Waterjet Machining; CFD; Erosion Model; Mechanical Engineering; Mechanical Engineering

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APA (6^th Edition):

Hale, P. (2012). MULTI-MODELLING of ABRASIVE WATERJET MACHINING. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/12698

Chicago Manual of Style (16^th Edition):

Hale, Patrick. “MULTI-MODELLING of ABRASIVE WATERJET MACHINING.” 2012. Masters Thesis, McMaster University. Accessed March 04, 2021. http://hdl.handle.net/11375/12698.

MLA Handbook (7^th Edition):

Hale, Patrick. “MULTI-MODELLING of ABRASIVE WATERJET MACHINING.” 2012. Web. 04 Mar 2021.

Vancouver:

Hale P. MULTI-MODELLING of ABRASIVE WATERJET MACHINING. [Internet] [Masters thesis]. McMaster University; 2012. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11375/12698.

Council of Science Editors:

Hale P. MULTI-MODELLING of ABRASIVE WATERJET MACHINING. [Masters Thesis]. McMaster University; 2012. Available from: http://hdl.handle.net/11375/12698

Penn State University

15. Doshi, Mitansh Sharad. COMPUTATIONAL PREDICTION OF A LARGE-SCALE HP TURBINE FLOW AGAINST MEASURED AERODYNAMIC DATA.

Degree: 2018, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16019mxd83

► This thesis presents a Reynolds-averaged Navier Stokes (RANS) equations-based computational validation of the Axial Flow Turbine Research Facility (AFTRF). The research turbine design was based… (more)

▼ This thesis presents a Reynolds-averaged Navier Stokes (RANS) equations-based computational validation of the Axial Flow Turbine Research Facility (AFTRF). The research turbine design was based on NASA’s E3 "Energy Efficient Engine" concept with 23 stationary nozzle guide vanes and a 29 blade high pressure (HP) turbine rotor. This large-scale and low-speed turbomachinery research facility provides high-resolution aerodynamic measurements from the turbine stage for the assessment of computational simulations. The finite volume-based general purpose fluid dynamics solver, Star CCM+, coupled with the k-ω SST turbulence model and the "Gamma transition" flow model were used. Various performance parameters were measured, including velocity profiles, nozzle/blade airfoil static pressure coefficients, and total pressure. The previously measured experimental data sets and boundary conditions from the AFTRF were used in a computational validation. NGV (Nozzle Guide Vanes) and rotor validations were performed and total-to-total efficiency was discussed. The present computational effort uses a "mixing plane" based stationary to rotating interface for stage calculations. A grid dependency assessment has been performed both on NGV and rotor flows. The computational results obtained at NGV-intraspace and rotor exit are compared to five-hole-probe based experimental data. The stage exit data from a Kiel probe are also compared to the current simulations. The current study concludes that the present computational model effectively predicts AFTRF aerodynamic flow features with good spatial resolution. An attempt is also made to compare the total-to-total efficiency distribution in the spanwise direction. The study concludes that this computational approach can be effectively used in turbine secondary flow reduction, tip leakage flow mitigation, unsteady flow computations and finally energy efficiency improvements. Advisors/Committee Members: Dr. Cengiz Camci, Thesis Advisor/Co-Advisor.

Subjects/Keywords: Turbine; CFD; Validation; NGV; Rotor; AFTRF; Turbulence model; K-Omega; Efficiency

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APA (6^th Edition):

Doshi, M. S. (2018). COMPUTATIONAL PREDICTION OF A LARGE-SCALE HP TURBINE FLOW AGAINST MEASURED AERODYNAMIC DATA. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16019mxd83

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):

Doshi, Mitansh Sharad. “COMPUTATIONAL PREDICTION OF A LARGE-SCALE HP TURBINE FLOW AGAINST MEASURED AERODYNAMIC DATA.” 2018. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/16019mxd83.

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

MLA Handbook (7^th Edition):

Doshi, Mitansh Sharad. “COMPUTATIONAL PREDICTION OF A LARGE-SCALE HP TURBINE FLOW AGAINST MEASURED AERODYNAMIC DATA.” 2018. Web. 04 Mar 2021.

Vancouver:

Doshi MS. COMPUTATIONAL PREDICTION OF A LARGE-SCALE HP TURBINE FLOW AGAINST MEASURED AERODYNAMIC DATA. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/16019mxd83.

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

Council of Science Editors:

Doshi MS. COMPUTATIONAL PREDICTION OF A LARGE-SCALE HP TURBINE FLOW AGAINST MEASURED AERODYNAMIC DATA. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/16019mxd83

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

Penn State University

16. McIntyre, Sean Michael. A multi-scale model for geared transmission aero-thermodynamics.

Degree: 2016, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/27550

► A multi-scale, multi-physics computational tool for the simulation of high-performance gearbox aero-thermodynamics was developed and applied to equilibrium and pathological loss-of-lubrication performance simulation. The physical… (more)

▼ A multi-scale, multi-physics computational tool for the simulation of high-performance gearbox aero-thermodynamics was developed and applied to equilibrium and pathological loss-of-lubrication performance simulation. The physical processes at play in these systems include multiphase compressible flow of the air and lubricant within the gearbox, meshing kinematics and tribology, as well as heat transfer by conduction, and free and forced convection. These physics are coupled across their representative space and time scales in the computational framework developed in this dissertation. These scales span eight orders of magnitude, from the thermal response of the full gearbox O(10⁰ m, 10² s), through effects at the tooth passage time scale O(10^-2 m, 10^-4 s), down to tribological effects on the meshing gear teeth O(10^-6 m, 10^-6 s). Direct numerical simulation of these coupled physics and scales is intractable. Accordingly, a scale-segregated simulation strategy was developed by partitioning and treating the contributing physical mechanisms as sub-problems, each with associated space and time scales, and appropriate coupling mechanisms. These are: 1. the long time scale thermal response of the system, 2. the multiphase (air, droplets, and film) aerodynamic flow and convective heat transfer within the gearbox, 3. the high-frequency, time-periodic thermal effects of gear tooth heating while in mesh and its subsequent cooling through the rest of rotation, 4. meshing effects including tribology and contact mechanics. The overarching goal of this dissertation was to develop software and analysis procedures for gearbox loss-of-lubrication performance. To accommodate these four physical effects and their coupling, each is treated in the CFD code as a sub problem. These physics modules are coupled algorithmically. Specifically, the high-frequency conduction analysis derives its local heat transfer coefficient and near-wall air temperature boundary conditions from a quasi-steady cyclic-symmetric simulation of the internal flow. This high-frequency conduction solution is coupled directly with a model for the meshing friction, developed by a collaborator, which was adapted for use in a finite-volume CFD code. The local surface heat flux on solid surfaces is calculated by time-averaging the heat flux in the high-frequency analysis. This serves as a fixed-flux boundary condition in the long time scale conduction module. The temperature distribution from this long time scale heat transfer calculation serves as a boundary condition for the internal convection simulation, and as the initial condition for the high-frequency heat transfer module. Using this multi-scale model, simulations were performed for equilibrium and loss-of-lubrication operation of the NASA Glenn Research Center test stand. Results were compared with experimental measurements. In addition to the multi-scale model itself, several other specific contributions were made. Eulerian models for droplets and wall-films were developed and implemented in the CFD… Advisors/Committee Members: Robert Francis Kunz, Dissertation Advisor/Co-Advisor, Kenneth Steven Brentner, Committee Member, Philip John Morris, Committee Member, Jules Washington Lindau V, Committee Member, Daniel Connell Haworth, Committee Member.

Subjects/Keywords: CFD; conjugate heat transfer; gearbox; multi-scale model

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APA (6^th Edition):

McIntyre, S. M. (2016). A multi-scale model for geared transmission aero-thermodynamics. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27550

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):

McIntyre, Sean Michael. “A multi-scale model for geared transmission aero-thermodynamics.” 2016. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/27550.

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

MLA Handbook (7^th Edition):

McIntyre, Sean Michael. “A multi-scale model for geared transmission aero-thermodynamics.” 2016. Web. 04 Mar 2021.

Vancouver:

McIntyre SM. A multi-scale model for geared transmission aero-thermodynamics. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/27550.

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

Council of Science Editors:

McIntyre SM. A multi-scale model for geared transmission aero-thermodynamics. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/27550

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

University of Newcastle

17. Ding, Hongliang. Development of design models for air-gravity fine powder transport.

Degree: PhD, 2017, University of Newcastle

URL: http://hdl.handle.net/1959.13/1354663

►

Research Doctorate - Doctor of Philosophy (PhD)

Air-gravity conveyors are widely used in industry to convey bulk materials with the advantages of low particle velocities,… (more)

▼

Research Doctorate - Doctor of Philosophy (PhD)

Air-gravity conveyors are widely used in industry to convey bulk materials with the advantages of low particle velocities, low levels of particle attrition, potentially high conveying rates and low power consumption. Most current designs are based on empirical design charts and past experience as there have been relatively few investigations attempting to model the flow of air-gravity conveyor systems. Instead of empirically based methods, this thesis adopted a new continuum approach based on fluid rheology to assess the flow performance of fine powders within air-gravity conveyors. Meanwhile, this thesis also conducted computational fluid dynamic (CFD) numerical simulations of an air-gravity conveying system with fluidised materials. Therefore, the objective of this research focused on the following specific aspects: design of the air-gravity conveyor; experimental determinations of the flow behaviour of aerated materials; theoretical modelling of the fluidised flow conveying models based on the rheology; validation of the proposed conveying models; and CFD simulation of the air-gravity fluidised conveying system. Initially, experimental investigations on the basic parameters including density parameters, particle size distribution and air-particle parameters were conducted on sand and flyash. Essentially, a combination of a fluidisation chamber and a rotary viscometer was applied for testing the shear stress and shear rate of fluidised materials, and then the rheology parameters could be determined accordingly. Secondly, the air-gravity conveyor was designed to form a circulation system for future experimental research. Detailed drawings are presented in this thesis. Essentially, the conveying system consists of four sections: hopper feed section, material conveying section, material receive section and material return section. Instrumentation for measuring pressure and mass flow rates was designed and installed in an experimental area. Thirdly, air-gravity conveying tests were conducted on sand and flyash. The material bed height, material mass flow rate and pressure drop were measured and analysed under vent and non-vent condition. Based on the experimental test procedure and test programme, the effect of air flow rate and channel inclination on the depth of flowing beds, material mass flow rate and pressure drop along the channel were investigated and discussed. Fourthly, a fundamental conveying model for air-gravity conveyor flows in inclined channels, with an emphasis on the conservation of momentum taking into account the rheology of the gas-solid mixture, was developed to predict the flow behaviour of material in air-gravity conveyors. By inputting the rheological parameters and conveying design data, the steady flow bed height of this air-gravity conveying system could be predicted. After that, rheology based conveying models were evaluated and validated by comparing the steady flow bed height produced from the conveying models with the experimental…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.

Subjects/Keywords: air-gravity conveyor; mathematical model; CFD simulation; fluidised flow; rheology

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APA (6^th Edition):

Ding, H. (2017). Development of design models for air-gravity fine powder transport. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1354663

Chicago Manual of Style (16^th Edition):

Ding, Hongliang. “Development of design models for air-gravity fine powder transport.” 2017. Doctoral Dissertation, University of Newcastle. Accessed March 04, 2021. http://hdl.handle.net/1959.13/1354663.

MLA Handbook (7^th Edition):

Ding, Hongliang. “Development of design models for air-gravity fine powder transport.” 2017. Web. 04 Mar 2021.

Vancouver:

Ding H. Development of design models for air-gravity fine powder transport. [Internet] [Doctoral dissertation]. University of Newcastle; 2017. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1959.13/1354663.

Council of Science Editors:

Ding H. Development of design models for air-gravity fine powder transport. [Doctoral Dissertation]. University of Newcastle; 2017. Available from: http://hdl.handle.net/1959.13/1354663

Texas Tech University

18. Chen, Zixi. Analyzing wind turbine wakes with virtual blade model technology using openfoam.

Degree: PhD, Mechanical Engineering, 2013, Texas Tech University

URL: http://hdl.handle.net/2346/73856

► Wake losses are a major component among the losses that contribute to the decrease in the Annual Energy Production of a wind farm. Understanding the… (more)

Subjects/Keywords: Wind Energy; Wind Turbine; Wake Interaction; CFD; Virtual Blade Model

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

APA (6^th Edition):

Chen, Z. (2013). Analyzing wind turbine wakes with virtual blade model technology using openfoam. (Doctoral Dissertation). Texas Tech University. Retrieved from http://hdl.handle.net/2346/73856

Chicago Manual of Style (16^th Edition):

Chen, Zixi. “Analyzing wind turbine wakes with virtual blade model technology using openfoam.” 2013. Doctoral Dissertation, Texas Tech University. Accessed March 04, 2021. http://hdl.handle.net/2346/73856.

MLA Handbook (7^th Edition):

Chen, Zixi. “Analyzing wind turbine wakes with virtual blade model technology using openfoam.” 2013. Web. 04 Mar 2021.

Vancouver:

Chen Z. Analyzing wind turbine wakes with virtual blade model technology using openfoam. [Internet] [Doctoral dissertation]. Texas Tech University; 2013. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2346/73856.

Council of Science Editors:

Chen Z. Analyzing wind turbine wakes with virtual blade model technology using openfoam. [Doctoral Dissertation]. Texas Tech University; 2013. Available from: http://hdl.handle.net/2346/73856

19. Yang, Lu. Analysis Of Pressure Distribution Along Pipeline Blockage Based On The Cfd Simulation.

Degree: MS, Petroleum Engineering, 2018, University of North Dakota

URL: https://commons.und.edu/theses/2439

► Pipeline blockage, which results from solid and hydrocarbon deposition caused by changes in pressure, temperature, or composition, is a critical issue in oil &… (more)

▼ Pipeline blockage, which results from solid and hydrocarbon deposition caused by changes in pressure, temperature, or composition, is a critical issue in oil & gas production and transportation systems. Sometimes blockage, which extends several miles in the long-distance pipeline, can be assumed as a new pipe with a smaller diameter. Therefore, it is imperative to detect the location and size of blockage in pipelines more accurately and efficiently to reduce the number of pipeline accidents. This paper explores the distribution of pressure and pressure gradient through the pipeline without/with single blockage under different operating conditions. 3-dimensional (3D) computational fluid dynamic (CFD) simulations under steady state are carried out to examine the effects of blockage location, blockage diameter and blockage length. The orthogonal array testing technique is applied to study the extent to which factor affects the pressure drop most. The dimensionless parameters like dimensionless blockage location, dimensionless blockage diameter, dimensionless blockage length and dimensionless pressure drop, are introduced to evaluate the relationship among the pressure drop and blockage characterizations. Three fitting formulas of dimensionless parameters distribution are proposed and could be used to locate the pipeline blockage and estimate its diameter and length as well. Finally, laboratory experiments were run to validate the blockage prediction model. The fluid frictional apparatus is modified by replacing part of the pipe with a section of small diameter pipe to simulate the actual partial blockade pipeline. The obtained deviations of pressure drop between the lab experiment result and the prediction model is limited to under 30%. Therefore, the deviation should be taken into account while assessing the blockage through the pipeline based on the blockage prediction model, which also allow the operator to assess partial blockage efficiently and economically. Advisors/Committee Members: Kegang Ling.

Subjects/Keywords: Blockage prediction model; CFD simulation; Dimensionless analysis; Pipeline blockage

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

APA (6^th Edition):

Yang, L. (2018). Analysis Of Pressure Distribution Along Pipeline Blockage Based On The Cfd Simulation. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/2439

Chicago Manual of Style (16^th Edition):

Yang, Lu. “Analysis Of Pressure Distribution Along Pipeline Blockage Based On The Cfd Simulation.” 2018. Masters Thesis, University of North Dakota. Accessed March 04, 2021. https://commons.und.edu/theses/2439.

MLA Handbook (7^th Edition):

Yang, Lu. “Analysis Of Pressure Distribution Along Pipeline Blockage Based On The Cfd Simulation.” 2018. Web. 04 Mar 2021.

Vancouver:

Yang L. Analysis Of Pressure Distribution Along Pipeline Blockage Based On The Cfd Simulation. [Internet] [Masters thesis]. University of North Dakota; 2018. [cited 2021 Mar 04]. Available from: https://commons.und.edu/theses/2439.

Council of Science Editors:

Yang L. Analysis Of Pressure Distribution Along Pipeline Blockage Based On The Cfd Simulation. [Masters Thesis]. University of North Dakota; 2018. Available from: https://commons.und.edu/theses/2439

Brigham Young University

20. Schroedter, Taylor L. Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System.

Degree: MS, 2018, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8717&context=etd

► This thesis discusses the results and insights gained from developing a CFD model of a pilot-scale pressurized dry coal-feed system using the Barracuda CFD software… (more)

▼ This thesis discusses the results and insights gained from developing a CFD model of a pilot-scale pressurized dry coal-feed system using the Barracuda CFD software and modeling various design concepts and operating conditions. The feed system was required to transport approximately 0.00378 kg/s (30 lb/hr) of pulverized coal from a vertical hopper to a 2.07 MPa (20.4 atm or 300 psi) reactor with a CO2-to-coal mass flow ratio of 1-2. Two feed system concepts were developed and tested for coal mass flow, CO2-to-coal mass ratio, steadiness, and uniformity. Piping system components also were evaluated for pressure drop and coal roping.With the first system concept, Barracuda software model parameters were explored to observe their effect on gas and particle flow. A mesh sensitivity study revealed there exists too fine of a mesh for dual-phase flow with Barracuda due to the particle initialization process. A relatively coarse mesh was found to be acceptable since the results did not change with increasing mesh refinement. Barracuda sub-model parameters that control particle interaction were investigated. Other than the close pack volume fraction, coal flow results were insensitive to changes in these parameters. Default Barracuda parameters were used for design simulations.The gravity-fed system (first concept) relied on gravity to transfer coal from a hopper into the CO2 carrier gas. This design was unable to deliver the required coal mass flow rate due to the cohesion and packing of the particles being greater than the gravity forces acting on the particles. The fluidized bed (second concept) relied on CO2 flow injected at the bottom of the hopper to fluidize the particles and transport them through a horizontal exit pipe. Additional CO2 was added post-hopper to dilute the flow and increase the velocity to minimize particle layout. This concept was shown to decouple the fluidized particle flow and dilution CO2 flow, providing significant design and operating flexibility. A non-uniform mesh was implemented to maintain a high mesh refinement in the 0.635-cm (¼-in) diameter transport pipe with less refinement in the hopper/bed region. The two main hopper diameters evaluated measured 5.08-cm (2-in) and 15.24-cm (6-in). Successful designs were achieved for each with appropriate coal mass flow rates and CO2-to-coal ratios. The particle flow was sufficiently steady for use with a coal burner.A piping system study was performed to test pneumatic transport and the effects of pipe length and bend radius. For a 1-to-1 gas-to-particle mass flow, particle layout occurred after 30 cm of travel. Particle roping occurred to various extents depending on the pipe bend radius. Bend radii of 0.318, 60.96, and 182.88 centimeters were simulated. Roping increased with bend radius and high pressure. Greater gas flow rates increased particle flow steadiness and uniformity. A simple methodology was identified to estimate the pressure drop for different piping system configurations based on the piping components simulated.

Subjects/Keywords: CFD model; pressurized dry-feed system; fluidization; pneumatic transport; Engineering

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APA (6^th Edition):

Schroedter, T. L. (2018). Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8717&context=etd

Chicago Manual of Style (16^th Edition):

Schroedter, Taylor L. “Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System.” 2018. Masters Thesis, Brigham Young University. Accessed March 04, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8717&context=etd.

MLA Handbook (7^th Edition):

Schroedter, Taylor L. “Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System.” 2018. Web. 04 Mar 2021.

Vancouver:

Schroedter TL. Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System. [Internet] [Masters thesis]. Brigham Young University; 2018. [cited 2021 Mar 04]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8717&context=etd.

Council of Science Editors:

Schroedter TL. Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System. [Masters Thesis]. Brigham Young University; 2018. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8717&context=etd

Delft University of Technology

21. Wang, Boyao (author). CFD modeling for moving jet penetrating cohesive soil.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1

►

<p class="MsoNormal">In dredging operation, the high-pressure water jet is widely used for the excavation of soil. To study the jetting process and optimize the dredging… (more)

▼

<p class="MsoNormal">In dredging operation, the high-pressure water jet is widely used for the excavation of soil. To study the jetting process and optimize the dredging devices, the moving vertical water jet penetrating cohesive soil experiments were carried out by Nobel (2013). However, in terms of the design optimization for the dredging devices, it is not easy to change the jet scale and soil properties during the experiment due to time and economic constraints. Some detailed physics during the jetting process, e.g. pressure on the soil surface and shear plane inside the soil during jetting, were also not monitored during the experiment. Therefore, numerical simulation is chosen to optimize the design of dredging devices and study the physics of the jetting process. A CFD (computational fluid dynamics) numerical model is built to simulate the moving jet penetrating cohesive soil. The soil is modeled as a Bingham plastic. The sediment transport is modeled by using drift-flux model. The moving jet modeling is achieved by using dynamic mesh algorithms AMI (arbitrary mesh interface) and A/R (cell layer addition removal). The CFD numerical model has been validated with the experiment of Nobel. After the validation, an analysis of the jetting process based on this CFD model is accomplished proving that the CFD model can reveal the details of the soil failure process during jetting. This thesis work reveals that it is possible to describe the hydraulic excavation of cohesive soil with reasonable accuracy using CFD numerical model. The CFD model can also reveal the details of the soil failure process that could not be retrieved from the experiment. Since the model is generic, it can be applied for a jet bar with multiple nozzles. This is helpful to improve the design of dredging equipment, optimize the operational settings and estimate the production.

Offshore and Dredging Engineering

Advisors/Committee Members: Keetels, Geert (mentor), Jarquin Laguna, Antonio (graduation committee), van Zuijlen, Alexander (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: CFD; cohesive soil; Moving jet; dynamic mesh; Drift-flux model

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APA (6^th Edition):

Wang, B. (. (2019). CFD modeling for moving jet penetrating cohesive soil. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1

Chicago Manual of Style (16^th Edition):

Wang, Boyao (author). “CFD modeling for moving jet penetrating cohesive soil.” 2019. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1.

MLA Handbook (7^th Edition):

Wang, Boyao (author). “CFD modeling for moving jet penetrating cohesive soil.” 2019. Web. 04 Mar 2021.

Vancouver:

Wang B(. CFD modeling for moving jet penetrating cohesive soil. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1.

Council of Science Editors:

Wang B(. CFD modeling for moving jet penetrating cohesive soil. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:3c1c9416-aa26-47cd-b77b-d8ba00824bb1

22. Jiratthiticheep, Isaree. CFD Method Validation: Simulation of Defroster Performance Testing .

Degree: Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper, 2020, Chalmers University of Technology

URL: http://hdl.handle.net/20.500.12380/302003

► An accurate prediction of the ice melting pattern would be useful for the performance evaluation and energy optimization during the design phase of the vehicle… (more)

▼ An accurate prediction of the ice melting pattern would be useful for the performance evaluation and energy optimization during the design phase of the vehicle defroster. It can also be used to ensure that the design passes the legal requirement as well. A transient CFD simulation method suitable for defroster performance simulation is therefore verified and validated in this study. The aim is to achieve as accurate and efficient simulation as possible for the use in industry. In this study, the geometry is first prepared in ANSA and the simulation and post-processing are executed in STAR-CCM+. Fluid film model is used to model the ice layer on the windscreen and its melting and solidification model plays an important part in obtaining the ice melting pattern. The model is first verified regarding the optimal mesh setting, time step size, flow solver setting and the choice of turbulence models. It was found that the mesh and turbulence model can affect the simulation stability greatly. Realizable k-epsilon, k-epsilon Lag EB and SST k-omega model are examined and Realizable k-epsilon is selected as the most suitable one for this simulation. The time step size and flow solver can then be adjusted to maximize the solution efficiency. With steady state nature of the flow field, the time step size can be increased up to 5 or even 15 s depend on the required level of accuracy. With the flow solver frozen after a steady state initialization, the solver time per time step can be further reduced by 30 – 35%. With 15 s time step size, the 42 minutes testing time transient simulation can be executed within 2.5 hours with 960 computational cores and still yields results with acceptable accuracy. Next, to improve the result accuracy, boundary conditions and the domain geometry are validated against the test data. It was found that the velocity and turbulence profile at HVAC-defroster connection is needed to achieve accurate flow impingement pattern and ice melting pattern on the windscreen. The ice layer thickness can also affect the melting rate considerably so it should be verified in future tests. In contrast, it is apparent that the simulation is not too sensitive to the defroster inlet temperature profile and so a variation within 5 – 10 ℃ is acceptable for future application. With these verifications, highly accurate ice melting pattern is achieved for both the windscreen and front side windows at the end of this study. The application of this final scheme on another vehicle model also confirms the method reliability.

Subjects/Keywords: CFD; Defroster; Deicing; Fluid film model; Melting and solidification

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APA (6^th Edition):

Jiratthiticheep, I. (2020). CFD Method Validation: Simulation of Defroster Performance Testing . (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/302003

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):

Jiratthiticheep, Isaree. “CFD Method Validation: Simulation of Defroster Performance Testing .” 2020. Thesis, Chalmers University of Technology. Accessed March 04, 2021. http://hdl.handle.net/20.500.12380/302003.

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

MLA Handbook (7^th Edition):

Jiratthiticheep, Isaree. “CFD Method Validation: Simulation of Defroster Performance Testing .” 2020. Web. 04 Mar 2021.

Vancouver:

Jiratthiticheep I. CFD Method Validation: Simulation of Defroster Performance Testing . [Internet] [Thesis]. Chalmers University of Technology; 2020. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/20.500.12380/302003.

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

Council of Science Editors:

Jiratthiticheep I. CFD Method Validation: Simulation of Defroster Performance Testing . [Thesis]. Chalmers University of Technology; 2020. Available from: http://hdl.handle.net/20.500.12380/302003

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

University of Toronto

23. Du, Eugene. A Model Reduction Framework with the Empirical Quadrature Procedure for High-dimensional Shape-parameterized Partial Differential Equations.

Degree: 2020, University of Toronto

URL: http://hdl.handle.net/1807/103607

►

This thesis details a goal-oriented model reduction framework for parameterized nonlinear partial differential equations (PDEs), with an emphasis on shape-deformation problems with high-dimensional and non-affine… (more)

Subjects/Keywords: CFD; EQP; FFD; finite element method; model reduction; reduced basis; 0538

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APA (6^th Edition):

Du, E. (2020). A Model Reduction Framework with the Empirical Quadrature Procedure for High-dimensional Shape-parameterized Partial Differential Equations. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/103607

Chicago Manual of Style (16^th Edition):

Du, Eugene. “A Model Reduction Framework with the Empirical Quadrature Procedure for High-dimensional Shape-parameterized Partial Differential Equations.” 2020. Masters Thesis, University of Toronto. Accessed March 04, 2021. http://hdl.handle.net/1807/103607.

MLA Handbook (7^th Edition):

Du, Eugene. “A Model Reduction Framework with the Empirical Quadrature Procedure for High-dimensional Shape-parameterized Partial Differential Equations.” 2020. Web. 04 Mar 2021.

Vancouver:

Du E. A Model Reduction Framework with the Empirical Quadrature Procedure for High-dimensional Shape-parameterized Partial Differential Equations. [Internet] [Masters thesis]. University of Toronto; 2020. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1807/103607.

Council of Science Editors:

Du E. A Model Reduction Framework with the Empirical Quadrature Procedure for High-dimensional Shape-parameterized Partial Differential Equations. [Masters Thesis]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/103607

National University of Ireland – Galway

24. Marzullo, Thibault. Towards the automatic generation of zonal models from CFD simulations .

Degree: 2020, National University of Ireland – Galway

URL: http://hdl.handle.net/10379/15875

► This doctoral thesis presents a novel computational tool chain able to automatically extract zonal models from CFD simulations of the built environment in order to… (more)

▼ This doctoral thesis presents a novel computational tool chain able to automatically extract zonal models from CFD simulations of the built environment in order to provide accurate and rapid predictions of indoor temperature distributions. This doctoral thesis introduces a method for automatically clustering the computational cells of CFD simulations into sub-zones that can be considered quasi isothermal and compute the mass and heat exchange between the sub-zones and the domain to extract a zonal model. The zonal model can then be solved for off-design boundary conditions at a fraction of the computational cost of CFD. This doctoral research first developed three methods for clustering CFD cells and compared their ability to capture the temperature distributions of the computational domain. These methods are: (1) the Mean Values Segmentation, (2) the Classic Watershed, and (3) the Coarse Grid method. The research presented in this thesis shows that the Mean Values Segmentation method performs best with regards to computational power and pertinence of the extracted clusters. Then, this doctoral thesis developed a method for generating zonal models from cell clusters and information extracted from the CFD simulation results such as boundary conditions. The method was applied to three case studies: an office space, a naturally ventilated meeting room, and an ideal ventilation case. This study has assessed the fidelity of the automatically generated zonal models when solved for off-design boundary conditions and has showed that the zonal models are able to predict temperature distributions with a weighted mean absolute error under 0.6 K when the temperature and mass flow rate at the boundaries are changed. The proposed methodology is able to capture and simulate local phenomena such as air stratification and thermal plumes with minimal error and is able to accommodate complex flow fields provided that the domain’s temperature is not uniform. Advisors/Committee Members: Monaghan, Rory (advisor).

Subjects/Keywords: zonal; model; energy; buildings; cfd; Engineering and Informatics; Mechanical Engineering

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

APA (6^th Edition):

Marzullo, T. (2020). Towards the automatic generation of zonal models from CFD simulations . (Thesis). National University of Ireland – Galway. Retrieved from http://hdl.handle.net/10379/15875

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):

Marzullo, Thibault. “Towards the automatic generation of zonal models from CFD simulations .” 2020. Thesis, National University of Ireland – Galway. Accessed March 04, 2021. http://hdl.handle.net/10379/15875.

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

MLA Handbook (7^th Edition):

Marzullo, Thibault. “Towards the automatic generation of zonal models from CFD simulations .” 2020. Web. 04 Mar 2021.

Vancouver:

Marzullo T. Towards the automatic generation of zonal models from CFD simulations . [Internet] [Thesis]. National University of Ireland – Galway; 2020. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10379/15875.

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

Council of Science Editors:

Marzullo T. Towards the automatic generation of zonal models from CFD simulations . [Thesis]. National University of Ireland – Galway; 2020. Available from: http://hdl.handle.net/10379/15875

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

25. Eriksson, Jesper. Modeling of Hydrogen-Peroxide Films for Aseptic Processing Applications- A Parameter Study on Hydrogen-Peroxide Exposure to Internal Surfaces of mm-wide Slits .

Degree: Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper, 2019, Chalmers University of Technology

URL: http://hdl.handle.net/20.500.12380/300209

► Disinfection methods are used within many fields to keep equipment and environments free from harmful biological agents such as fungi, bacteria, viruses and spore forms.… (more)

▼ Disinfection methods are used within many fields to keep equipment and environments free from harmful biological agents such as fungi, bacteria, viruses and spore forms. Within the food and drug industry, aseptic processing refers to a process chain in which sterilized products are filled into sterilized containers. Aseptic processing brings benefits such as improved quality and increased shelf life of a product, which in turn leads to less waste due to the expiration of products. The benefits of aseptic processing introduce a demand for the development of effective disinfection methods. A common chemical disinfection method is the usage of hydrogen-peroxide to kill bacteria. One way to perform hydrogen-peroxide disinfection is to spray a vapor containing air, water and hydrogen-peroxide which is allowed to condense on cold surfaces forming a liquid film of water and hydrogen-peroxide which conducts the desired bacteria killing. It is important that all surfaces have been exposed to a hydrogen-peroxide film to ensure a rapid disinfection. This project aims to investigate the process of hydrogen-peroxide film condensation to evaluate the degree of liquid film coverage and gas hydrogen-peroxide exposure within mm-wide slits. The investigation was carried out using Computational Fluid Dynamics (CFD). The process of hydrogen-peroxide gas disinfection is well understood, but the process of liquid film formation and dynamics is more complex and many challenges remain within this field. In particular, there are no previous studies investigating film formation within small slits. A parameter study was performed to evaluate how the characteristic width of a slit h and the external gas flow velocity v influence the degree of liquid film coverage on the inside surfaces of a slit. The results suggest that the critical value of h as a function of v to ensure full surface film coverage follow hcrit(v) = 6.44v−0.2838−1.84, which is valid within the range v = [0.5, 2.0]. Expressed in terms of the dimensionless mass transfer Péclet number Peh, the criteria for full surface film coverage is according to the results Peh > 97. The results remove the need of having a high spatial resolution around mm-narrow spaces. Instead the developed macro-scale model can be used to predict the degree of hydrogen-peroxide exposure within the slit only with the knowledge of gas velocity external to the slit.

Subjects/Keywords: hydrogen-peroxide; aseptic; disinfection; film; condensation; model; dropwise; CFD; slit

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

APA (6^th Edition):

Eriksson, J. (2019). Modeling of Hydrogen-Peroxide Films for Aseptic Processing Applications- A Parameter Study on Hydrogen-Peroxide Exposure to Internal Surfaces of mm-wide Slits . (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/300209

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):

Eriksson, Jesper. “Modeling of Hydrogen-Peroxide Films for Aseptic Processing Applications- A Parameter Study on Hydrogen-Peroxide Exposure to Internal Surfaces of mm-wide Slits .” 2019. Thesis, Chalmers University of Technology. Accessed March 04, 2021. http://hdl.handle.net/20.500.12380/300209.

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

MLA Handbook (7^th Edition):

Eriksson, Jesper. “Modeling of Hydrogen-Peroxide Films for Aseptic Processing Applications- A Parameter Study on Hydrogen-Peroxide Exposure to Internal Surfaces of mm-wide Slits .” 2019. Web. 04 Mar 2021.

Vancouver:

Eriksson J. Modeling of Hydrogen-Peroxide Films for Aseptic Processing Applications- A Parameter Study on Hydrogen-Peroxide Exposure to Internal Surfaces of mm-wide Slits . [Internet] [Thesis]. Chalmers University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/20.500.12380/300209.

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

Council of Science Editors:

Eriksson J. Modeling of Hydrogen-Peroxide Films for Aseptic Processing Applications- A Parameter Study on Hydrogen-Peroxide Exposure to Internal Surfaces of mm-wide Slits . [Thesis]. Chalmers University of Technology; 2019. Available from: http://hdl.handle.net/20.500.12380/300209

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

26. Widebrant, Jakob. Nasal Obstruction - Diagnosis and Prediction using Computational Fluid Dynamics - Using Computational Fluid Dynamics (CFD) to Study Nasal Obstructions and Studying Digital Demonstrations in Fluid Dynamics .

Degree: Chalmers tekniska högskola / Institutionen för vetenskapens kommunikation och lärande (CLS), 2020, Chalmers University of Technology

URL: http://hdl.handle.net/20.500.12380/300988

► When a patient visits the doctor and expresses trouble breathing through the nose, the diagnostic method and whether nasal surgery is needed comes with a… (more)

Subjects/Keywords: Nasal obstruction; Rhinomanometry; CFD; k-epsilon model; online lecture

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APA (6^th Edition):

Widebrant, J. (2020). Nasal Obstruction - Diagnosis and Prediction using Computational Fluid Dynamics - Using Computational Fluid Dynamics (CFD) to Study Nasal Obstructions and Studying Digital Demonstrations in Fluid Dynamics . (Thesis). Chalmers University of Technology. Retrieved from http://hdl.handle.net/20.500.12380/300988

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):

Widebrant, Jakob. “Nasal Obstruction - Diagnosis and Prediction using Computational Fluid Dynamics - Using Computational Fluid Dynamics (CFD) to Study Nasal Obstructions and Studying Digital Demonstrations in Fluid Dynamics .” 2020. Thesis, Chalmers University of Technology. Accessed March 04, 2021. http://hdl.handle.net/20.500.12380/300988.

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

MLA Handbook (7^th Edition):

Widebrant, Jakob. “Nasal Obstruction - Diagnosis and Prediction using Computational Fluid Dynamics - Using Computational Fluid Dynamics (CFD) to Study Nasal Obstructions and Studying Digital Demonstrations in Fluid Dynamics .” 2020. Web. 04 Mar 2021.

Vancouver:

Widebrant J. Nasal Obstruction - Diagnosis and Prediction using Computational Fluid Dynamics - Using Computational Fluid Dynamics (CFD) to Study Nasal Obstructions and Studying Digital Demonstrations in Fluid Dynamics . [Internet] [Thesis]. Chalmers University of Technology; 2020. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/20.500.12380/300988.

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

Council of Science Editors:

Widebrant J. Nasal Obstruction - Diagnosis and Prediction using Computational Fluid Dynamics - Using Computational Fluid Dynamics (CFD) to Study Nasal Obstructions and Studying Digital Demonstrations in Fluid Dynamics . [Thesis]. Chalmers University of Technology; 2020. Available from: http://hdl.handle.net/20.500.12380/300988

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

27. Zhang, Hongbin. Approaches to Simulation of an Underground Longwall Mine and Implications for Ventilation System Analysis.

Degree: MS, Mining Engineering, 2015, Virginia Tech

URL: http://hdl.handle.net/10919/52977

► Carefully engineered mine ventilation is critical to the safe operation of underground longwall mines. Currently, there are several options for simulation of mine ventilation. This… (more)

▼ Carefully engineered mine ventilation is critical to the safe operation of underground longwall mines. Currently, there are several options for simulation of mine ventilation. This research was conducted to rapidly simulate an underground longwall mine, especially for the use of tracer gas in an emergency situation. In an emergency situation, limited information about the state of mine ventilation system is known, and it is difficult to make informed decisions about safety of the mine for rescue personnel. With careful planning, tracer gases can be used to remotely ascertain changes in the ventilation system. In the meantime, simulation of the tracer gas can be conducted to understand the airflow behavior for improvements during normal operation. Better informed decisions can be made with the help of both tracer gas technique and different modeling approaches. This research was made up of two main parts. One was a field study conducted in an underground longwall mine in the western U.S. The other one was a simulation of the underground longwall mine with different approaches, such as network modeling and Computational Fluid Dynamics (CFD) models. Networking modeling is the most prevalent modeling technique in the mining industry. However, a gob area, which is a void zone filled with broken rocks after the longwall mining, cannot be simulated in an accurate way with networking modeling. CFD is a powerful tool for modeling different kinds of flows under various situations. However, it requires a significant time investment for the expert user as well as considerable computing power. To take advantage of both network modeling and CFD, the hybrid approach, which is a combination of network modeling and CFD was established. Since tracer gas was released and collected in the field study, the tracer gas concentration profile was separately simulated in network modeling, CFD model, and hybrid model in this study. The simulated results of airflow and tracer gas flow were analyzed and compared with the experimental results from the field study. Two commercial network modeling software packages were analyzed in this study. One of the network modeling software also has the capability to couple with CFD. A two-dimensional (2D) CFD model without gob was built to first analyze the accuracy of CFD. More 2D CFD models with gob were generated to determine how much detail was necessary for the gob model. Several three-dimensional (3D) CFD models with gob were then created. A mesh independence study and a sensitivity study for the porosity and permeability values were created to determine the optimal mesh size, porosity and permeability values for the 3D CFD model, and steady-state simulation and transient simulations were conducted in the 3D CFD models. In the steady-state simulation, a comparison was made between the 3D CFD models with and without taking the diffusivity of SF6 in air into account. Finally, the different simulation techniques were compared to measured field data, and assessed to determine if the hybrid approach was… Advisors/Committee Members: Luxbacher, Kramer Davis (committeechair), Ragab, Saad A. (committee member), Luttrell, Gerald H. (committee member).

Subjects/Keywords: CFD modeling; network modeling; hybrid model; underground mine ventilation

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APA (6^th Edition):

Zhang, H. (2015). Approaches to Simulation of an Underground Longwall Mine and Implications for Ventilation System Analysis. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52977

Chicago Manual of Style (16^th Edition):

Zhang, Hongbin. “Approaches to Simulation of an Underground Longwall Mine and Implications for Ventilation System Analysis.” 2015. Masters Thesis, Virginia Tech. Accessed March 04, 2021. http://hdl.handle.net/10919/52977.

MLA Handbook (7^th Edition):

Zhang, Hongbin. “Approaches to Simulation of an Underground Longwall Mine and Implications for Ventilation System Analysis.” 2015. Web. 04 Mar 2021.

Vancouver:

Zhang H. Approaches to Simulation of an Underground Longwall Mine and Implications for Ventilation System Analysis. [Internet] [Masters thesis]. Virginia Tech; 2015. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10919/52977.

Council of Science Editors:

Zhang H. Approaches to Simulation of an Underground Longwall Mine and Implications for Ventilation System Analysis. [Masters Thesis]. Virginia Tech; 2015. Available from: http://hdl.handle.net/10919/52977

University of Louisville

28. Wang, Ni. Improved fabrication and modeling of piezoresistive microcantilever beams for gas detection and sensing.

Degree: PhD, 2012, University of Louisville

URL: 10.18297/etd/1520 ; https://ir.library.louisville.edu/etd/1520

► Symmetric piezoresistive microcantilever beams have been demonstrated in previous research to be capable of sensing the presence of surrounding gas. This occurs as the… (more)

▼ Symmetric piezoresistive microcantilever beams have been demonstrated in previous research to be capable of sensing the presence of surrounding gas. This occurs as the damping effect of the gas changes the beam resonance behavior. Device sensitivity has been increased dramatically after changing the symmetric beam base to an asymmetric beam base. This dissertation seeks to improve on beam fabrication and simplify the fabrication procedure compared to earlier approaches. By changing to a polymer mask and using new equipment, an entire wafer can be fabricated in far less time compared to the previous approach. While this new approach shows great promise, additional research is needed to demonstrate consistent device quality comparable with earlier approaches. This dissertation also focuses on the continued development of such devices with an emphasis on modeling to better understand the resonant behavior in a gas. Past work at the University of Louisville and elsewhere has relied upon simplified fluid mechanics models to relate changes in resonance with gas properties. The current work considers a combination of Stokes' oscillating cylinder model and computational fluid dynamics simulation to better characterize the damping effect including the effect of the rectangular cross-section and the presence of a boundary (the silicon handle layer) located 2 µm below the beam. The beam is induced to vibrate by electrical attractive forces at the end that change with applied driving electrode voltage and beam voltage. The electrostatic force, the displacement of the beam tip, the change of resistance of beam base due to piezoresistive effects, and the resulting signal received by the lock-in amplifier is established by a combination of analytical models and finite element simulation. This simulated output signal provides valuable insights to address issues of proper parameters to use during testing. This new information developed in this dissertation helps to advance the state of the art for microresonating beams for gas detection. This information is expected to play a key role as the systems in this work are transitioned to use in practice. Advisors/Committee Members: Bradshaw, Roger D..

Subjects/Keywords: Fabrication; piezoresistive; microcantilever beam; CFD model; gas sensor; damping

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

APA (6^th Edition):

Wang, N. (2012). Improved fabrication and modeling of piezoresistive microcantilever beams for gas detection and sensing. (Doctoral Dissertation). University of Louisville. Retrieved from 10.18297/etd/1520 ; https://ir.library.louisville.edu/etd/1520

Chicago Manual of Style (16^th Edition):

Wang, Ni. “Improved fabrication and modeling of piezoresistive microcantilever beams for gas detection and sensing.” 2012. Doctoral Dissertation, University of Louisville. Accessed March 04, 2021. 10.18297/etd/1520 ; https://ir.library.louisville.edu/etd/1520.

MLA Handbook (7^th Edition):

Wang, Ni. “Improved fabrication and modeling of piezoresistive microcantilever beams for gas detection and sensing.” 2012. Web. 04 Mar 2021.

Vancouver:

Wang N. Improved fabrication and modeling of piezoresistive microcantilever beams for gas detection and sensing. [Internet] [Doctoral dissertation]. University of Louisville; 2012. [cited 2021 Mar 04]. Available from: 10.18297/etd/1520 ; https://ir.library.louisville.edu/etd/1520.

Council of Science Editors:

Wang N. Improved fabrication and modeling of piezoresistive microcantilever beams for gas detection and sensing. [Doctoral Dissertation]. University of Louisville; 2012. Available from: 10.18297/etd/1520 ; https://ir.library.louisville.edu/etd/1520

University of Sydney

29. Yao, Hanxun. A local correlation-based transition model for Spalart-Allmaras turbulence model .

Degree: 2017, University of Sydney

URL: http://hdl.handle.net/2123/17382

► The Spalart Allmaras (S-A) Reynolds-Averaged Navier-Stokes (RANS) model has had considerable success in application to a wide range of turbulent flow problems. However, as turbulent… (more)

Subjects/Keywords: CFD; Turbulence model; Boundary layer; Laminar-turbulence transition

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APA (6^th Edition):

Yao, H. (2017). A local correlation-based transition model for Spalart-Allmaras turbulence model . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/17382

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):

Yao, Hanxun. “A local correlation-based transition model for Spalart-Allmaras turbulence model .” 2017. Thesis, University of Sydney. Accessed March 04, 2021. http://hdl.handle.net/2123/17382.

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

MLA Handbook (7^th Edition):

Yao, Hanxun. “A local correlation-based transition model for Spalart-Allmaras turbulence model .” 2017. Web. 04 Mar 2021.

Vancouver:

Yao H. A local correlation-based transition model for Spalart-Allmaras turbulence model . [Internet] [Thesis]. University of Sydney; 2017. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2123/17382.

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

Council of Science Editors:

Yao H. A local correlation-based transition model for Spalart-Allmaras turbulence model . [Thesis]. University of Sydney; 2017. Available from: http://hdl.handle.net/2123/17382

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

McMaster University

30. Ghorbani, Najmeh. Effects of Transcatheter Intervention on Hemodynamics of Coarctation of the Aorta.

Degree: MASc, 2021, McMaster University

URL: http://hdl.handle.net/11375/26163

►

Coarctation of the aorta (CoA) is a congenital heart disease in which the aorta witnesses localized obstruction. CoA can be fatal if left untreated. Endovascular… (more)

Subjects/Keywords: Coarctation of the Aorta; LES Model; CFD Simulation

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

APA (6^th Edition):

Ghorbani, N. (2021). Effects of Transcatheter Intervention on Hemodynamics of Coarctation of the Aorta. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/26163

Chicago Manual of Style (16^th Edition):

Ghorbani, Najmeh. “Effects of Transcatheter Intervention on Hemodynamics of Coarctation of the Aorta.” 2021. Masters Thesis, McMaster University. Accessed March 04, 2021. http://hdl.handle.net/11375/26163.

MLA Handbook (7^th Edition):

Ghorbani, Najmeh. “Effects of Transcatheter Intervention on Hemodynamics of Coarctation of the Aorta.” 2021. Web. 04 Mar 2021.

Vancouver:

Ghorbani N. Effects of Transcatheter Intervention on Hemodynamics of Coarctation of the Aorta. [Internet] [Masters thesis]. McMaster University; 2021. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/11375/26163.

Council of Science Editors:

Ghorbani N. Effects of Transcatheter Intervention on Hemodynamics of Coarctation of the Aorta. [Masters Thesis]. McMaster University; 2021. Available from: http://hdl.handle.net/11375/26163

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Open Access Theses and Dissertations