subject:(Computational Fluid Dynamics CFD )

Halmstad University

1. Ivchenko, Alexander. Incorporation of OpenFOAM software into Computational Fluid Dynamics process in Volvo Technology.

Degree: Computer and Electrical Engineering (IDE), 2011, Halmstad University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16356

► In this thesis work the feasibility of using open source OpenFOAM software as a solver part for Computation Fluid Dynamics in Volvo Technology is… (more)

Subjects/Keywords: OpenFOAM; CFD; Computational Fluid Dynamics

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APA (6^th Edition):

Ivchenko, A. (2011). Incorporation of OpenFOAM software into Computational Fluid Dynamics process in Volvo Technology. (Thesis). Halmstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16356

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):

Ivchenko, Alexander. “Incorporation of OpenFOAM software into Computational Fluid Dynamics process in Volvo Technology.” 2011. Thesis, Halmstad University. Accessed February 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16356.

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

MLA Handbook (7^th Edition):

Ivchenko, Alexander. “Incorporation of OpenFOAM software into Computational Fluid Dynamics process in Volvo Technology.” 2011. Web. 26 Feb 2021.

Vancouver:

Ivchenko A. Incorporation of OpenFOAM software into Computational Fluid Dynamics process in Volvo Technology. [Internet] [Thesis]. Halmstad University; 2011. [cited 2021 Feb 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16356.

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

Council of Science Editors:

Ivchenko A. Incorporation of OpenFOAM software into Computational Fluid Dynamics process in Volvo Technology. [Thesis]. Halmstad University; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16356

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

Penn State University

2. Coder, James George. Development of a CFD-Compatible Transition Model Based on Linear Stability Theory.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22627

► A new laminar-turbulent transition model for low-turbulence external aerodynamic applications is presented that incorporates linear stability theory in a manner compatible with modern computational fluid… (more)

Subjects/Keywords: Aerodynamics; computational fluid dynamics; CFD; transition; turbulence

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APA (6^th Edition):

Coder, J. G. (2014). Development of a CFD-Compatible Transition Model Based on Linear Stability Theory. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22627

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):

Coder, James George. “Development of a CFD-Compatible Transition Model Based on Linear Stability Theory.” 2014. Thesis, Penn State University. Accessed February 26, 2021. https://submit-etda.libraries.psu.edu/catalog/22627.

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

MLA Handbook (7^th Edition):

Coder, James George. “Development of a CFD-Compatible Transition Model Based on Linear Stability Theory.” 2014. Web. 26 Feb 2021.

Vancouver:

Coder JG. Development of a CFD-Compatible Transition Model Based on Linear Stability Theory. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Feb 26]. Available from: https://submit-etda.libraries.psu.edu/catalog/22627.

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

Council of Science Editors:

Coder JG. Development of a CFD-Compatible Transition Model Based on Linear Stability Theory. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22627

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

Victoria University of Wellington

3. Willis, Riley. Validation of CFD Predictions of Urban Wind - Developing a Methodology.

Degree: 2017, Victoria University of Wellington

URL: http://hdl.handle.net/10063/7086

► “Good mental health in a fluid or CFD modeller is always indicated by the presence of a suspicious nature, cynicism and a ‘show me’ attitude.… (more)

▼ “Good mental health in a fluid or CFD modeller is always indicated by the presence of a suspicious nature, cynicism and a ‘show me’ attitude. These are not necessarily the best traits for a life mate or a best friend, but they are essential if the integrity of the modelling process is to be maintained.” (Meroney, 2004) Over the past 50 years, Computational Fluid Dynamics (CFD) computer simulation programs have offered a new method of calculating the wind comfort and safety data for use in pedestrian wind studies. CFD models claim to have some important advantages over wind tunnels; which remain the most common method of wind calculation. While wind tunnels provide measurements of selected points, CFD simulations provide whole-flow field data for the entire area under investigation (Blocken, 2014; Blocken, Stathopoulos, & van Beeck, 2016). Similarly, wind tunnel measurements must consider the similarity requirements involved with testing a model at small scale, while CFD simulations can avoid this as they are conducted at full scale (Ramponi & Blocken, 2012a). However, CFD simulations can also often be misleading; and they should only be trusted once they can be proven to be accurate. To appease the requirements for this cynical view- referenced in the above quote- proper verification and validation of a model is imperative. This thesis investigated and tested the current best practice guidelines around CFD model validation, using existing wind tunnel measurements of generic urban arrays. The goal of the research was to determine whether the existing data and guidance around the validation process was sufficient for a consultant user to trust that a CFD model they created was sufficiently accurate to base design decisions from. The CFD code Autodesk CFD was used to simulate two configurations first tested as wind tunnel models by the Architectural Institute of Japan, and Opus labs in Wellington. The Wellington City Council wind speed criteria were used to determine whether the CFD simulations met the required accuracy criteria for council consent. Results from the study found that the CFD models could not meet the accuracy criteria. It concluded that while the validation process provided sufficient guidance, there is a lack of available data which is relevant to CFD validation for urban flows. It was recommended that at least one improved dataset was required, to build a system by which a consultant can identify what the requirements of a CFD model are to provide accurate CFD analysis of the site under investigation. To accommodate the range of sites likely to be present in urban wind studies, it was recommended that the new dataset provided data for a variety of wind flows likely to be found in cities. Advisors/Committee Members: Donn, Michael, Isaacs, Nigel.

Subjects/Keywords: CFD; Validation; Pedestrian wind; Computational Fluid Dynamics

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APA (6^th Edition):

Willis, R. (2017). Validation of CFD Predictions of Urban Wind - Developing a Methodology. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/7086

Chicago Manual of Style (16^th Edition):

Willis, Riley. “Validation of CFD Predictions of Urban Wind - Developing a Methodology.” 2017. Masters Thesis, Victoria University of Wellington. Accessed February 26, 2021. http://hdl.handle.net/10063/7086.

MLA Handbook (7^th Edition):

Willis, Riley. “Validation of CFD Predictions of Urban Wind - Developing a Methodology.” 2017. Web. 26 Feb 2021.

Vancouver:

Willis R. Validation of CFD Predictions of Urban Wind - Developing a Methodology. [Internet] [Masters thesis]. Victoria University of Wellington; 2017. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10063/7086.

Council of Science Editors:

Willis R. Validation of CFD Predictions of Urban Wind - Developing a Methodology. [Masters Thesis]. Victoria University of Wellington; 2017. Available from: http://hdl.handle.net/10063/7086

Delft University of Technology

4. Saleh, K. (author). The Development of Downhole Separators in Series, Using Design Models Based on Computational Fluid Dynamics Verified By Laboratory Experiments.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:fe21dbbe-56ae-40a8-a486-0490dcce9136

►

One of the major problems associated with oil and gas production is the large volume of produced water. Operators around the world are facing significant… (more)

▼

One of the major problems associated with oil and gas production is the large volume of produced water. Operators around the world are facing significant costs with the treatment and disposal of produced water. Downhole separation, a relatively new technique, has been developed to reduce the costs of produced water and increase oil production. Downhole separation is the technique where oil and gas from the produced wa- ter is separated at the bottom of the well and re-inject some of the produced water into another formation, while the oil and gas are pumped to the surface. The reduction in cost is owed to the downhole treatment of the produced water since most of the topside produced water treatment facilities are reduced in number. Since most of the produced water does not reach the surface this creates an added value of minimizing the opportunity for contamination of underground sources of drinking water through leaks in casing and tubing during the injection process. The goal of this project was to design a downhole liquid-liquid separator and to evaluate the performance at downhole conditions with the aid of computational fluid dynamics. The separation performance is evaluated experimentally. A dedicated test rig has been designed and built at ProLabNL, a sister company of Ascom Separation, to test the separation efficiency of the downhole separator. The designed system consisted of three hydrocyclone stages in series to polish the water to the desired injectate quality of 100 ppm oil in water, and was operated under downhole conditions, i.e. high temperature (70 - 80 àC), high watercut (90 - 95%) and relatively large oil droplets (ranging from 500 - 1000 [?m]) dispersed in the continuous phase. The system design and the operational method are fully outlined. At the tail-end of production, reservoir pressure is depleted causing increased sand production. In the existing commercial downhole separators, the solids that are produced are re-injected downhole leading to potential plugging of the disposal zone. The proposed downhole fluid separation system is equipped with a de-sander to flush the separated sand with the oil rich stream to the surface. Computational fluid dynamics was used to evaluate the pressure balance and volume flux balance of the internals. An erosion analysis was conducted to investigate the wear due to the sand influx. Furthermore, laboratory tests were conducted to evaluate the influence of a progressive cavity pump (PCP) on the shearing effect of an oil water mixture. The pressure-drop over the pump seems to play a cru- cial role on the amount of droplet breakup which leads to a decrease in separation efficiency of the downhole separator.

Petroleum Engineering

Civil Engineering and Geosciences

Advisors/Committee Members: Zitha, P.L.J. (mentor), Swanborn, R.A. (mentor), Bos, A. (mentor).

Subjects/Keywords: DOWS; downhole separator; CFD; computational fluid dynamics

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APA (6^th Edition):

Saleh, K. (. (2015). The Development of Downhole Separators in Series, Using Design Models Based on Computational Fluid Dynamics Verified By Laboratory Experiments. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:fe21dbbe-56ae-40a8-a486-0490dcce9136

Chicago Manual of Style (16^th Edition):

Saleh, K (author). “The Development of Downhole Separators in Series, Using Design Models Based on Computational Fluid Dynamics Verified By Laboratory Experiments.” 2015. Masters Thesis, Delft University of Technology. Accessed February 26, 2021. http://resolver.tudelft.nl/uuid:fe21dbbe-56ae-40a8-a486-0490dcce9136.

MLA Handbook (7^th Edition):

Saleh, K (author). “The Development of Downhole Separators in Series, Using Design Models Based on Computational Fluid Dynamics Verified By Laboratory Experiments.” 2015. Web. 26 Feb 2021.

Vancouver:

Saleh K(. The Development of Downhole Separators in Series, Using Design Models Based on Computational Fluid Dynamics Verified By Laboratory Experiments. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Feb 26]. Available from: http://resolver.tudelft.nl/uuid:fe21dbbe-56ae-40a8-a486-0490dcce9136.

Council of Science Editors:

Saleh K(. The Development of Downhole Separators in Series, Using Design Models Based on Computational Fluid Dynamics Verified By Laboratory Experiments. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:fe21dbbe-56ae-40a8-a486-0490dcce9136

University of Edinburgh

5. Machtsiras, Georgios. Utilizing flow characteristics to increase performance in swimming.

Degree: PhD, 2013, University of Edinburgh

URL: http://hdl.handle.net/1842/7926

► Performance when gliding in the streamlined position depends on a swimmer’s morphological characteristics, body orientation and water characteristics. The purpose of this thesis was twofold.… (more)

▼ Performance when gliding in the streamlined position depends on a swimmer’s morphological characteristics, body orientation and water characteristics. The purpose of this thesis was twofold. First to identify and assess the effect of controllable factors that contribute to glide performance and second to form the foundations of an improved approach of simulating the fluid flow around the swimmers’ body. To address the purposes of the thesis four investigations were conducted. Study 1. The effect of the head position on glide performance was investigated. When the high, medium and low head positions were compared, it was found that swimmers experience significantly greater resistance and decelerate faster when they adopt a high head position. It was also found that there is no significant difference between the medium and low head position indicating for the first time that swimmers can choose any of the positions according to their natural tendency. Study 2. The second study examined the effect of gliding depth on gliding performance. A range of depths was investigated ranging from 0.8 m to 0.2 m from the water surface. The results demonstrated significantly higher glide factor values for glides at a greater depth when compared to glides closer to the water surface highlighting the retarding effect of wave drag when gliding close to the surface. The optimum gliding performance was reported for glides at 0.8 m from the surface. Study 3. The third study investigated the effect of full body swimsuits on glide performance. According to the findings, it is demonstrated for the first time that the improved gliding performance when wearing full body swimsuits is linked to changes in swimmers’ morphology due to compression. Study 4. In the fourth study the magnitude of resistive forces applied on a swimmer’s body when gliding underwater was assessed with the use of computational fluid dynamics (CFD) and the LES approach. The results showed a close match between the glide factor values of the experimental and the computational findings demonstrating the effectiveness of the CFD method when the LES approach is employed.

Subjects/Keywords: swimming performance; drag; computational fluid dynamics; CFD

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APA (6^th Edition):

Machtsiras, G. (2013). Utilizing flow characteristics to increase performance in swimming. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/7926

Chicago Manual of Style (16^th Edition):

Machtsiras, Georgios. “Utilizing flow characteristics to increase performance in swimming.” 2013. Doctoral Dissertation, University of Edinburgh. Accessed February 26, 2021. http://hdl.handle.net/1842/7926.

MLA Handbook (7^th Edition):

Machtsiras, Georgios. “Utilizing flow characteristics to increase performance in swimming.” 2013. Web. 26 Feb 2021.

Vancouver:

Machtsiras G. Utilizing flow characteristics to increase performance in swimming. [Internet] [Doctoral dissertation]. University of Edinburgh; 2013. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1842/7926.

Council of Science Editors:

Machtsiras G. Utilizing flow characteristics to increase performance in swimming. [Doctoral Dissertation]. University of Edinburgh; 2013. Available from: http://hdl.handle.net/1842/7926

University of Windsor

6. Vaselbehagh, Ahmadreza. Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2015, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5493

► The present document is a manuscript-based dissertation covering Ahmadreza Vasel-Be-Hagh's PhD research from September, 2011 to May, 2015. The research was particularly focused on… (more)

▼ The present document is a manuscript-based dissertation covering Ahmadreza Vasel-Be-Hagh's PhD research from September, 2011 to May, 2015. The research was particularly focused on studying hydrodynamics of underwater accumulators of compressed air for an underwater compressed air energy storage (UWCAES) plant. The accumulator units were floral configurations of droplet-shaped balloons installed close to the bed of deep water. The research was carried out in two major parts: water flow over the balloons and flow produced by the bursting of the balloons. In the first part, three-dimensional simulations were conducted to investigate water flow over accumulators. The simulation was carried out at a free stream Reynolds number of 230,000 using URANS k – omega and LES Dyna – SM turbulence models. The structure of the flow was investigated using iso-surfaces of the second invariant of the velocity gradient and three-dimensional path lines. Several shedding vortex tubes were identified downstream of the balloons. The dynamics of these vortex tubes was further illustrated through time series snapshots containing vorticity lines on two-dimensional planes perpendicular to the flow direction. The frequency of the shedding and the turbulent movements of the vortex tubes were studied through power spectrum analysis of the force coefficients. In the second part, the flow produced by the bursting of balloons was studied experimentally using photographs taken by three cameras with speed of 60 frames per second at a resolution of 1080P. It was observed that if a sufficiently large air-filled balloon quickly burst underwater, a vortex ring bubble was generated. The effect of dimensionless surface tension on general characteristics of the vortex ring bubble including rise velocity, rate of expansion, circulation and trajectory was investigated. It was observed that as the dimensionless surface tension increased, the rise velocity, the circulation and consequently the stability of the vortex ring bubble increased; however, the rate of expansion tends toward constant values. A semi-analytical model was also developed suggesting that the vortex ring expansion is essentially due to the buoyancy force. An expression was also obtained for the circulation in terms of the initial volume of the balloon and the depth at which balloon bursts. Extending from the mentioned semi-analytical model, a perturbation analysis was performed to find an expression for the radius of the buoyant vortex rings. The radius equation includes two terms; the zeroth-order solution representing the effect of buoyancy, and the first-order perturbation correction describing the influence of viscosity. The zeroth-order solution is an explicit function of time; the first-order perturbation modification, however, includes the drag coefficient which is unknown and of interest. Fitting the photographically measured radius into the modified equation yields the time history of the drag coefficient of the corresponding buoyant vortex ring. Advisors/Committee Members: Ting, David, Carriveau, Rupp.

Subjects/Keywords: CFD; Computational Fluid Dynamics; Experimental Fluid Dynamics; Fluid mechanics; Vortex Dynamics; Vortex Ring

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APA (6^th Edition):

Vaselbehagh, A. (2015). Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5493

Chicago Manual of Style (16^th Edition):

Vaselbehagh, Ahmadreza. “Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant.” 2015. Doctoral Dissertation, University of Windsor. Accessed February 26, 2021. https://scholar.uwindsor.ca/etd/5493.

MLA Handbook (7^th Edition):

Vaselbehagh, Ahmadreza. “Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant.” 2015. Web. 26 Feb 2021.

Vancouver:

Vaselbehagh A. Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant. [Internet] [Doctoral dissertation]. University of Windsor; 2015. [cited 2021 Feb 26]. Available from: https://scholar.uwindsor.ca/etd/5493.

Council of Science Editors:

Vaselbehagh A. Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant. [Doctoral Dissertation]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5493

University of New South Wales

7. Tkachenko, Svetlana. Coupling of radiation and natural convection in open-ended channel in application to building-integrated photovoltaic systems.

Degree: Mechanical & Manufacturing Engineering, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/62230 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58334/SOURCE02?view=true

► The control of temperatures of PV cells is a significant challenge in building-integrated photovoltaic (BIPV) systems. Double-skin façades provide an attractive and cost-effective solution in… (more)

▼ The control of temperatures of PV cells is a significant challenge in building-integrated photovoltaic (BIPV) systems. Double-skin façades provide an attractive and cost-effective solution in which an air gap is created between the PV modules and building wall. The objective of this thesis is to use computational simulations to improve the understanding of complex interaction of radiation with turbulent natural convective flow in the air gap and to enhance heat transfer by optimising interaction between the two mechanisms. A discrete ordinates model (DOM) for radiation transport together with a spectral line weighted sum of grey gases (SLW) model and a collocated interpolation module are adopted to evaluate the absorption properties of participating gases. As a result, wall-to-wall as well as participating gas radiation transfers are evaluated in a three-dimensional turbulent flow; the latter being calculated with a large eddy simulation (LES) formulation. Flow and thermal field development in time and space is attained to investigate the natural convection occurring in a three-dimensional vertical, open-ended, rectangular channel heated on one side which occurs in typical BIPV configurations. A parametric study with various wall emissivities with and without a participating medium is presented. Complex three-dimensional vortical structures are identified which directly affect the temperature distribution on the heated wall, suggesting that investigations of the centre plane behaviour only are not sufficient for understanding the heat transfer rates at the walls and the consequent behaviour of convective flows within the system away from the centre plane.When wall-to-wall radiation is introduced into the simulations, the unheated walls are impacted by the radiation from the heated wall. As a result, there is a very significant change in the vortical structures as well as averaged flow and thermal fields and the turbulence statistics. As the emissivity of the walls is increased the temperature of the heated wall is significantly reduced from a time and space averaged value of 62°C with the emissivity set to zero to 48°C when the emissivity of all the walls is set at 0.9. This change in the temperature can result in an increase in the efficiency of the PV cells of approximately 7%.It follows that the internal walls of BIPV systems should be lined with materials of as high an emissivity as is economically viable to optimise their efficiency and accelerate the take up by the building industry. Advisors/Committee Members: Timchenko, Victoria, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Yeoh, Guan, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Natural convection; CFD; Renewable; Turbulence; Radiation; Computational modelling; Computational fluid dynamics

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APA (6^th Edition):

Tkachenko, S. (2018). Coupling of radiation and natural convection in open-ended channel in application to building-integrated photovoltaic systems. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/62230 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58334/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Tkachenko, Svetlana. “Coupling of radiation and natural convection in open-ended channel in application to building-integrated photovoltaic systems.” 2018. Doctoral Dissertation, University of New South Wales. Accessed February 26, 2021. http://handle.unsw.edu.au/1959.4/62230 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58334/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Tkachenko, Svetlana. “Coupling of radiation and natural convection in open-ended channel in application to building-integrated photovoltaic systems.” 2018. Web. 26 Feb 2021.

Vancouver:

Tkachenko S. Coupling of radiation and natural convection in open-ended channel in application to building-integrated photovoltaic systems. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Feb 26]. Available from: http://handle.unsw.edu.au/1959.4/62230 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58334/SOURCE02?view=true.

Council of Science Editors:

Tkachenko S. Coupling of radiation and natural convection in open-ended channel in application to building-integrated photovoltaic systems. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/62230 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58334/SOURCE02?view=true

Uppsala University

8. Jansson, Anders. CFD simulation of pool dynamics in a nuclear reactor's condensation pool.

Degree: Applied Nuclear Physics, 2014, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222832

► In a nuclear reactor the containment protects the environment from radioactive emissions. It is separated in two parts, a drywell and a wetwell. The… (more)

▼ In a nuclear reactor the containment protects the environment from radioactive emissions. It is separated in two parts, a drywell and a wetwell. The drywell contains the reactor vessel and the steam pipes. If a steam leakage occurs in this part of the containment the pressure will increase. To reduce the pressure raising the reactor safety system uses the pressure suppression principle. By this principle the steam is condensed in a condensation pool filled with water. This pool is located in the wetwell part of the containment. To connect the drywell and wetwell there are pipes connected between them. These pipes are submerged under the water level in the condensation pool. This means that steam will be blown down into the condensation pool if the pressure in the drywell exceeds the hydrostatic pressure at the pipe outlet in the pool. In this thesis the blow down process has been studied with computational fluid dynamics (CFD). The aim was to study the pressure distribution in the condensation pool during a blow down sequence. It is useful to know the pressure distribution and the size of the pressure oscillations to calculate the forces acting on components in the pool and the pool structure. The CFD method has also been compared to the current used method for this type of calculations. The current method at Westinghouse uses a program called SPIEGEL. Simulations have been made on a model of a blow down pipe and a condensation pool. This model is called the PPOOLEX facility and is set up at Lappeenranta University of Technology in Finland. The facility has a simplified design compared to a real system. The blow down pipe in the PPOOLEX facility has only opening in the bottom of the pipe while a real blow down pipe has several small holes scattered along the pipe wrap. One of the simulations made in this project was based on an experiment performed on the PPOOLEX facility. The results from the simulation were compared to the experimental results. In that experiment only air was blown in to the facility. Another simulation was made where steam was blown into the facility. Two different CFD solvers, CFX and STAR-CCM+, were used to perform the simulations. Because of the great need for computing power, however, mostly STAR-CCM+ was used. The result of the air simulation showed similar values of the pressure distribution as in experiment. During the simulation also temperatures were measured and compared to the experiment temperature measurements. In these results there were larger differences between the simulation and the experiment, especially for points located in air. Graphic illustrations of volume fractions and pressures in the facility were produced during the simulation. When steam was used as a source fluid in the simulation some problems appeared in the solution. The CFD software had problems to get a converging solution, probably due to incomplete or incorrect settings for the solver. The conclusions of this thesis are that CFD can be used to simulate an air blow down…

Subjects/Keywords: CFD; computational fluid dynamics; condensation pool; pool dynamics; nuclear reactor; CFD; beräkningsströmningsdynamik; kondensationsbassäng; pooldynamik; kärnkraftsreaktor

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APA (6^th Edition):

Jansson, A. (2014). CFD simulation of pool dynamics in a nuclear reactor's condensation pool. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222832

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):

Jansson, Anders. “CFD simulation of pool dynamics in a nuclear reactor's condensation pool.” 2014. Thesis, Uppsala University. Accessed February 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222832.

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

MLA Handbook (7^th Edition):

Jansson, Anders. “CFD simulation of pool dynamics in a nuclear reactor's condensation pool.” 2014. Web. 26 Feb 2021.

Vancouver:

Jansson A. CFD simulation of pool dynamics in a nuclear reactor's condensation pool. [Internet] [Thesis]. Uppsala University; 2014. [cited 2021 Feb 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222832.

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

Council of Science Editors:

Jansson A. CFD simulation of pool dynamics in a nuclear reactor's condensation pool. [Thesis]. Uppsala University; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222832

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

Brno University of Technology

9. Palička, Miroslav. Reverzní vírová turbina: Reversible swirl turbine.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/191826

► This diploma thesis describes hydraulic design of Swirl turbine, dedicated to be used for tidal powerplant and study possibilities of the turbine to work in… (more)

Subjects/Keywords: Prílivová elektráreň; Vírová turbína; hydraulický návrh; CFD (Computational fluid dynamics); Tidal powerplant; Swirl turbine; hydraulic design; CFD (Computational fluid dynamics)

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APA (6^th Edition):

Palička, M. (2020). Reverzní vírová turbina: Reversible swirl turbine. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/191826

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):

Palička, Miroslav. “Reverzní vírová turbina: Reversible swirl turbine.” 2020. Thesis, Brno University of Technology. Accessed February 26, 2021. http://hdl.handle.net/11012/191826.

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

MLA Handbook (7^th Edition):

Palička, Miroslav. “Reverzní vírová turbina: Reversible swirl turbine.” 2020. Web. 26 Feb 2021.

Vancouver:

Palička M. Reverzní vírová turbina: Reversible swirl turbine. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/11012/191826.

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

Council of Science Editors:

Palička M. Reverzní vírová turbina: Reversible swirl turbine. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/191826

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

Brno University of Technology

10. Kůrečka, Jan. Zlepšení hydraulických vlastností vírových turbin: Improving of hydraulic properties of swirl turbines.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/60799

► This diploma thesis describes design of blade geometry of swirl turbines with different blade row density for given parameters Q11 = 1,9 [m3s-1], n11 =… (more)

Subjects/Keywords: Vírová turbína; hustota lopatkové mříže; CFD(Computational fluid dynamics).; Swirl turbine; blade row density; CFD(Computational fluid dynamics).

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APA (6^th Edition):

Kůrečka, J. (2019). Zlepšení hydraulických vlastností vírových turbin: Improving of hydraulic properties of swirl turbines. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/60799

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):

Kůrečka, Jan. “Zlepšení hydraulických vlastností vírových turbin: Improving of hydraulic properties of swirl turbines.” 2019. Thesis, Brno University of Technology. Accessed February 26, 2021. http://hdl.handle.net/11012/60799.

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

MLA Handbook (7^th Edition):

Kůrečka, Jan. “Zlepšení hydraulických vlastností vírových turbin: Improving of hydraulic properties of swirl turbines.” 2019. Web. 26 Feb 2021.

Vancouver:

Kůrečka J. Zlepšení hydraulických vlastností vírových turbin: Improving of hydraulic properties of swirl turbines. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/11012/60799.

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

Council of Science Editors:

Kůrečka J. Zlepšení hydraulických vlastností vírových turbin: Improving of hydraulic properties of swirl turbines. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/60799

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

11. Pardue, Juliette Kelly. Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications.

Degree: MS, Computer Science, 2015, Old Dominion University

URL: https://digitalcommons.odu.edu/computerscience_etds/31

► A bottom-up approach to parallel anisotropic mesh generation is presented by building a mesh generator from the principles of point-insertion, triangulation, and Delaunay refinement.… (more)

Subjects/Keywords: Parallel anisotropic mesh generation; Delaunay refinement; Computational fluid dynamics; CFD simulations; Computer Sciences; Fluid Dynamics

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APA (6^th Edition):

Pardue, J. K. (2015). Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications. (Thesis). Old Dominion University. Retrieved from https://digitalcommons.odu.edu/computerscience_etds/31

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):

Pardue, Juliette Kelly. “Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications.” 2015. Thesis, Old Dominion University. Accessed February 26, 2021. https://digitalcommons.odu.edu/computerscience_etds/31.

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

MLA Handbook (7^th Edition):

Pardue, Juliette Kelly. “Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications.” 2015. Web. 26 Feb 2021.

Vancouver:

Pardue JK. Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications. [Internet] [Thesis]. Old Dominion University; 2015. [cited 2021 Feb 26]. Available from: https://digitalcommons.odu.edu/computerscience_etds/31.

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

Council of Science Editors:

Pardue JK. Parallel Two-Dimensional Unstructured Anisotropic Delaunay Mesh Generation for Aerospace Applications. [Thesis]. Old Dominion University; 2015. Available from: https://digitalcommons.odu.edu/computerscience_etds/31

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

RMIT University

12. Tehzeeb, A. Evaluation of brick kiln performances using computational fluid dynamics (CFD).

Degree: 2013, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:160496

► Modern history of civilization is concurrent to the use of brick and its manufacturing. BrickÂ kiln is the most important component in the manufacturing of clay-burnt… (more)

▼ Modern history of civilization is concurrent to the use of brick and its manufacturing. BrickÂ kiln is the most important component in the manufacturing of clay-burnt bricks. PoorlyÂ operated brick kilns are considered as the major sources of greenhouse gas (GHG) emissionÂ nowadays. Various types of brick kilns are in operation throughout the world. Tunnel kiln isÂ the most widely used technology in developed countries as it is highly automated. OtherÂ technologies which are quite popular in developing countries are: Hoffman kiln, VerticalÂ Shaft kiln, Fixed Chimney kiln, Zigzag kiln, etc. Computational Fluid Dynamics (CFD) software, ANSYS CFX is being applied to evaluateÂ performance of Tunnel kiln using natural gas as its fuel. The idea of a typical Tunnel kilnÂ layout geometry has been envisaged from local brick industries. The length, width and heightÂ of the Tunnel kiln geometry are taken as 100 m Ã— 3.24 m Ã— 1.48 m. The length and width ofÂ the brick stack is taken as 920 mm Ã— 440 mm. With a gap of 400 mm and 100 mm betweenÂ two brick stacks longitudinally and laterally respectively, a total of 450 (6 Ã— 75) stacks can beÂ accommodated inside the kiln at a time. Brick stack height including the kiln car height isÂ taken as 1.38 m. There is a clearance of 100 mm between the stack and the kiln roof. ToÂ produce certain quality bricks/ceramics, a particular temperature distribution throughout theÂ kiln needs to be maintained. This temperature distribution with respect to the kiln length isÂ known as Tunnel kiln curve. To achieve the Tunnel kiln curve obtained from industry forÂ ordinary brick type, some design parameters need to be optimized for a given geometry.Â Selection of these optimized design parameters are obtained through a series of trial and errorÂ runs of the CFD model. The total length of the tunnel can be divided into pre-heating, firingÂ and cooling zones. Green bricks pass through the pre-heating, then firing and finally theÂ cooling zones, while fresh air flows in opposite direction of the brick stack move. It is to beÂ noted that brick industries are very reluctant to disclose any of those technical secrets relatedÂ to their brick kiln design. In this regard, this design is based on initial guesses of thoseÂ parameters and slowly come up with best performing scenario with respect to consideredÂ Tunnel kiln curve. To achieve the Tunnel kiln curve, the design parameters that need to be played around are gasÂ and air flow rates, flow directions, their inlet-outlet number, spacing and placements atÂ different locations of the kiln are considered very crucial. Other important parameters that areÂ varied include brick stack placement with respect to air and gas inlet-outlets, gaps betweenÂ ivÂ kiln roof and stacks and gaps between two consecutive stacks. To supply adequate air, a largeÂ rectangular air inlet with an area of 0.8 m2 is placed at the roof of the exit end of the kiln. ToÂ maintain the air temperature distribution as given in Tunnel kiln curve, one intermediate sizeÂ air outlet with…

Subjects/Keywords: Fields of Research; Computational Fluid Dynamics (CFD); Design optimization; Tunnel kiln

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APA (6^th Edition):

Tehzeeb, A. (2013). Evaluation of brick kiln performances using computational fluid dynamics (CFD). (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:160496

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):

Tehzeeb, A. “Evaluation of brick kiln performances using computational fluid dynamics (CFD).” 2013. Thesis, RMIT University. Accessed February 26, 2021. http://researchbank.rmit.edu.au/view/rmit:160496.

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

MLA Handbook (7^th Edition):

Tehzeeb, A. “Evaluation of brick kiln performances using computational fluid dynamics (CFD).” 2013. Web. 26 Feb 2021.

Vancouver:

Tehzeeb A. Evaluation of brick kiln performances using computational fluid dynamics (CFD). [Internet] [Thesis]. RMIT University; 2013. [cited 2021 Feb 26]. Available from: http://researchbank.rmit.edu.au/view/rmit:160496.

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

Council of Science Editors:

Tehzeeb A. Evaluation of brick kiln performances using computational fluid dynamics (CFD). [Thesis]. RMIT University; 2013. Available from: http://researchbank.rmit.edu.au/view/rmit:160496

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

Rochester Institute of Technology

13. Prosser, Daniel. Flapping wing design for a dragonfly-like micro air vehicle.

Degree: Mechanical Engineering, 2011, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5804

► In this thesis, the aerodynamics of the Quad-Wing Vehicle, a Micro Air Vehicle designed to hover with four flapping wings in a dragonfly-like configuration, is… (more)

Subjects/Keywords: Bio-inspired; CFD; Computational fluid dynamics; Flapping; MAV; Micro air vehicle

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APA (6^th Edition):

Prosser, D. (2011). Flapping wing design for a dragonfly-like micro air vehicle. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5804

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):

Prosser, Daniel. “Flapping wing design for a dragonfly-like micro air vehicle.” 2011. Thesis, Rochester Institute of Technology. Accessed February 26, 2021. https://scholarworks.rit.edu/theses/5804.

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

MLA Handbook (7^th Edition):

Prosser, Daniel. “Flapping wing design for a dragonfly-like micro air vehicle.” 2011. Web. 26 Feb 2021.

Vancouver:

Prosser D. Flapping wing design for a dragonfly-like micro air vehicle. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Feb 26]. Available from: https://scholarworks.rit.edu/theses/5804.

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

Council of Science Editors:

Prosser D. Flapping wing design for a dragonfly-like micro air vehicle. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/5804

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

Vanderbilt University

14. Ingram, Philip David. Investigation of the Madaras Wind Turbine using Computational Tools.

Degree: MS, Mechanical Engineering, 2012, Vanderbilt University

URL: http://hdl.handle.net/1803/14507

► Computational modeling of the Madaras wind turbine is presented in this thesis. First, comparative studies were performed based upon literature results to validate the accuracy… (more)

Subjects/Keywords: Computational Fluid Dynamics; Wind Turbine; Madaras; Wind Energy; CFD

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APA (6^th Edition):

Ingram, P. D. (2012). Investigation of the Madaras Wind Turbine using Computational Tools. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/14507

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):

Ingram, Philip David. “Investigation of the Madaras Wind Turbine using Computational Tools.” 2012. Thesis, Vanderbilt University. Accessed February 26, 2021. http://hdl.handle.net/1803/14507.

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

MLA Handbook (7^th Edition):

Ingram, Philip David. “Investigation of the Madaras Wind Turbine using Computational Tools.” 2012. Web. 26 Feb 2021.

Vancouver:

Ingram PD. Investigation of the Madaras Wind Turbine using Computational Tools. [Internet] [Thesis]. Vanderbilt University; 2012. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1803/14507.

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

Council of Science Editors:

Ingram PD. Investigation of the Madaras Wind Turbine using Computational Tools. [Thesis]. Vanderbilt University; 2012. Available from: http://hdl.handle.net/1803/14507

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

15. He, Xiaoliang. CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models.

Degree: MS, Mechanical Engineering, 2013, Oregon State University

URL: http://hdl.handle.net/1957/36138

► With continued development of the electronic industry, the demand for highly efficient heat removal solutions requires innovative cooling technologies. A computational fluid dynamic (CFD) study,… (more)

▼ With continued development of the electronic industry, the demand for highly efficient heat removal solutions requires innovative cooling technologies. A computational fluid dynamic (CFD) study, including heat transfer, is performed for an axisymmetric, confined jet impingement experiencing boiling and coupled with vapor extraction. Boiling occurs at the target surface while extraction occurs at the wall confining the radial flow. The region between the target and confining wall is defined as a confined gap. Extraction is employed to enhance heat transfer and to minimize the potential negative influence of flow instabilities resulting from two-phase flow within a confined region. A three-dimensional sector of the confined jet is employed in the simulation. A single circular impinging jet with a constant jet diameter (4 mm) and variable gap height (0.5, 1.0 and 1.5 mm), also known as nozzle-to-target spacing, is considered. The effect of mass flux at the confined gap entrance is also investigated (200, 400 and 800 kg/m²-s) for a range of heat flux (5 to 50 W/cm²). Fluid flow and heat transfer are simulated using the Volume of Fluid (VOF) model and the wall-boiling sub-model within the Multiphase Segregated Flow (MSF) model. The boiling sub-model in the VOF model applies the Rohsenow boiling correlation, while in the MSF model, the Kurul-Podowski boiling sub-model is used. Also, vapor extraction is realized by different mechanisms for these two models. For the VOF model, a specific phase "wall porosity" can be assigned to a wall to make it porous. Over a range of pressure differentials across this porous wall such that the inertial transport influence is negligible, vapor transport should agree with Darcy's law. For the MSF model, a wall can be made permeability to one substance or phase while remaining impermeable to the other substance or phase. However, a portion of the substance or phase reaching the boundary allowed to pass through the surface must be specified. A pressure drop cannot be applied across the wall, thereby prohibiting Darcy flow modeling. The solutions of both models are at steady state. The boiling curves without vapor extraction from both models are provided and compared to experiments. Simulations matching experimental wall temperatures under-predict theoretical vapor generation and those matching vapor generation over-estimate wall superheat. For cases with no extraction, local temperature and velocity profiles from the VOF model are provided at several radial locations within the confined gap. Scalar temperature and pressure distributions and velocity vectors are presented to explain observations in profiles. Advisors/Committee Members: Pence, Debroah V. (advisor), Liburdy, James (committee member).

Subjects/Keywords: CFD; Computational fluid dynamics

…3 2.1.2 Single-Phase Computational Studies… …12 2.2.2 Two-Phase Computational Studies… …15 2.3.2 Computational Extraction Studies… …22 3.3.1 Computational domain… …23 3.3.2 Computational mesh…

10 more images…

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

APA (6^th Edition):

He, X. (2013). CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/36138

Chicago Manual of Style (16^th Edition):

He, Xiaoliang. “CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models.” 2013. Masters Thesis, Oregon State University. Accessed February 26, 2021. http://hdl.handle.net/1957/36138.

MLA Handbook (7^th Edition):

He, Xiaoliang. “CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models.” 2013. Web. 26 Feb 2021.

Vancouver:

He X. CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models. [Internet] [Masters thesis]. Oregon State University; 2013. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1957/36138.

Council of Science Editors:

He X. CFD simulation of single-phase and flow boiling in confined jet impingement with in-situ vapor extraction using two kinds of multiphase models. [Masters Thesis]. Oregon State University; 2013. Available from: http://hdl.handle.net/1957/36138

Stellenbosch University

16. Burger, Abri Andre Spies. Numerical analysis of flow around infinite and finite cylinders at trans-critical Reynolds numbers with and without surface roughness.

Degree: MEng, Mechanical and Mechatronic Engineering, 2015, Stellenbosch University

URL: http://hdl.handle.net/10019.1/97053

►

ENGLISH ABSTRACT: This thesis investigates the flow field and pressure distributions around cylinders at trans-critical Reynolds numbers using the k-ε Realizable turbulence model. A steady… (more)

▼

ENGLISH ABSTRACT: This thesis investigates the flow field and pressure distributions around cylinders at trans-critical Reynolds numbers using the k-ε Realizable turbulence model. A steady state 2-D and 3-D Fluent® model is successfully developed to evaluate the effects of changing various modelling parameters on the static pressure distribution around an infinite and finite cylinder. These parameters include surface roughness, cylinder rotation and air viscosity at the cylinder surface. The subsequent results obtained are compared to each other and to data trends from literature as well as measured experimental results and are found to be in good agreement. In addition a method for calibrating all developed methods based on their shear stress curves over a flat plate model is also successfully developed. The main objective is to find an appropriate single parameter which can be used for the rigorous adjustment of the pressure distribution around a cooling tower, which will allow for improved sensitivity analysis and modelling of cooling tower performance under wind conditions with and without meridional ribs located on the outer shell surface.

AFRIKAANSE OPSOMMING: Hierdie tesis ondersoek die vloeiveld en druk verdelings rondom silinders by trans-kritiese Reynolds getalle deur gebruik te maak van die k-ε Realizable turbulensie model. ‘n Bestendige toestand 2-D en 3-D Fluent® model is suksesvol ontwikkel om die uitwerking van die verandering van verskeie model parameters op die statiese druk verdeling rondom ‘n oneindige en eindige silinder te evalueer. Die laasgenoemde parameters sluit in oppervlak grofheid, silinder rotasie en lug viskositeit by die silinder wand. Die daaropeenvolgende resultate wat verkry word, word met data tendense uit die literatuur asook gemete data vanuit eksperimente vergelyk en goeie ooreenkoms i.t.v die data tendense is gevind. Verder is ‘n metode vir die suksesvolle kalibrasie van die ontwikkelde numeriese tegnieke ontwikkel. Die laasgenoemde kalibrasie metode is gebaseer op die vergelyking van skuifspanning kurwes vir vloei oor ‘n plat plaat model. Die hoofdoel van die navorsing is om ‘n geskikte enkele parameter te vind wat gebruik kan word vir die effektiewe aanpassing van die druk verdeling rondom ‘n koeltoring wat sal lei tot verbeterde sensitiwiteits analise en modellering van koeltoring verrigting onder wind toestande met en sonder meridionale ribbes geleë op die buitenste dop oppervlak.

Advisors/Committee Members: Reuter, Hanno Carl Rudolf, Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Computational Fluid Dynamics (CFD); Cooling towers; Surface roughness; UCTD

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APA (6^th Edition):

Burger, A. A. S. (2015). Numerical analysis of flow around infinite and finite cylinders at trans-critical Reynolds numbers with and without surface roughness. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/97053

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):

Burger, Abri Andre Spies. “Numerical analysis of flow around infinite and finite cylinders at trans-critical Reynolds numbers with and without surface roughness.” 2015. Thesis, Stellenbosch University. Accessed February 26, 2021. http://hdl.handle.net/10019.1/97053.

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

MLA Handbook (7^th Edition):

Burger, Abri Andre Spies. “Numerical analysis of flow around infinite and finite cylinders at trans-critical Reynolds numbers with and without surface roughness.” 2015. Web. 26 Feb 2021.

Vancouver:

Burger AAS. Numerical analysis of flow around infinite and finite cylinders at trans-critical Reynolds numbers with and without surface roughness. [Internet] [Thesis]. Stellenbosch University; 2015. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10019.1/97053.

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

Council of Science Editors:

Burger AAS. Numerical analysis of flow around infinite and finite cylinders at trans-critical Reynolds numbers with and without surface roughness. [Thesis]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/97053

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

Stellenbosch University

17. Hariram, Adhikar Vishaykanth. The use of CFD for heliostat wind load analysis.

Degree: MEng, Mechanical and Mechatronic Engineering, 2015, Stellenbosch University

URL: http://hdl.handle.net/10019.1/97048

► ENGLISH ABSTRACT: The capability of computational fluid dynamics (CFD), in particular the FLUENT ™ commercial software suite, to predict wind loadings on heliostats has been… (more)

▼ ENGLISH ABSTRACT: The capability of computational fluid dynamics (CFD), in particular the FLUENT ™ commercial software suite, to predict wind loadings on heliostats has been investigated. If CFD proves useful in this area then the overall development costs of heliostats and concentrating solar thermal power plants could be reduced. Due to the largest loading on the heliostat originating from wind loads, by using CFD to determine these loads it could be possible to ensure heliostats are not overdesigned. This thesis contains a first study within the Solar Thermal Energy Research Group (STERG) at Stellenbosch University into the use of CFD for determining heliostat wind loads. The relevant theoretical background concerning the turbulence models used in this study, namely, the RNG k-ε, Realisable k-ε and SST k-ω turbulence models is reiterated. The „standard‟ k-ε model and the large eddy simulation (LES) approach, due to their relevance to bluff body flows, are also revisited. Some analysis is also provided around each model to gain insight as to the role of respective modelling sensitivities and their advantages. Previous work done in the area of heliostat wind studies is reviewed. The geometric considerations when dealing with heliostats leads onto the discussion concerning the requirement of modelling boundary layer profiles. Hence some background is provided on boundary layer modelling techniques. Further insight is drawn from more general previous bluff body CFD reported in the literature, from which observations and recommendations regarding the use of variations of the k-ε turbulence model can be inferred. The simulation procedure from geometry creation to results obtained for the flow over a vertical flat plate is reported. This investigation led to the conclusion that the Realisable k-ε should be used for the heliostat simulations on account of its accurate drag prediction under steady state flow conditions. It was also found that for transient simulations for heliostat like geometries, the SST k-ω model appears most suitable. The Realisable k-ε model is then used to model the flow about a heliostat using the same procedures as for the flat plate; both with flat and boundary layer inlet profiles. The overall conclusions drawn from this work are that the Realisable k-ε would not be suitable for predicting wind loads used in the final design of heliostats although it may be used with flat velocity and turbulence profiles to compare differences between early heliostat designs. The conclusion that the Realisable k-ε model should not be used to predict the flow field in the vicinity of a heliostat is also reached. It is recommended that further work should be carried out by using more advanced modelling techniques, such as the LES, to determine wind loads on heliostats. Furthermore, additional studies focused on accurately reproducing the velocity and turbulence profiles should be done. Lastly a larger set of data containing the orientations mentioned in literature should be generated using the methods contained… Advisors/Committee Members: Harms, Thomas M., Gauche, Paul, Stellenbosch University. Faulty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Computational fluid dynamics (CFD); Renewable energy; Heliostats – Wind loadings; UCTD

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APA (6^th Edition):

Hariram, A. V. (2015). The use of CFD for heliostat wind load analysis. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/97048

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):

Hariram, Adhikar Vishaykanth. “The use of CFD for heliostat wind load analysis.” 2015. Thesis, Stellenbosch University. Accessed February 26, 2021. http://hdl.handle.net/10019.1/97048.

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

MLA Handbook (7^th Edition):

Hariram, Adhikar Vishaykanth. “The use of CFD for heliostat wind load analysis.” 2015. Web. 26 Feb 2021.

Vancouver:

Hariram AV. The use of CFD for heliostat wind load analysis. [Internet] [Thesis]. Stellenbosch University; 2015. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10019.1/97048.

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

Council of Science Editors:

Hariram AV. The use of CFD for heliostat wind load analysis. [Thesis]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/97048

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

Penn State University

18. Shanks, Matthew Ferrell. Cavitation Modeling on the Automotive Torque Converter using Computational Fluid Dynamics with a Mixing Plane Approach.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/22407

► The automotive torque converter is a fluid coupling device used to transfer power, with multiplication of torque, from the engine to the transmission. Cavitation is… (more)

Subjects/Keywords: Cavitation; Torque Converter; Computational Fluid Dynamics; CFD; Mixing Plane

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

APA (6^th Edition):

Shanks, M. F. (2014). Cavitation Modeling on the Automotive Torque Converter using Computational Fluid Dynamics with a Mixing Plane Approach. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22407

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):

Shanks, Matthew Ferrell. “Cavitation Modeling on the Automotive Torque Converter using Computational Fluid Dynamics with a Mixing Plane Approach.” 2014. Thesis, Penn State University. Accessed February 26, 2021. https://submit-etda.libraries.psu.edu/catalog/22407.

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

MLA Handbook (7^th Edition):

Shanks, Matthew Ferrell. “Cavitation Modeling on the Automotive Torque Converter using Computational Fluid Dynamics with a Mixing Plane Approach.” 2014. Web. 26 Feb 2021.

Vancouver:

Shanks MF. Cavitation Modeling on the Automotive Torque Converter using Computational Fluid Dynamics with a Mixing Plane Approach. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Feb 26]. Available from: https://submit-etda.libraries.psu.edu/catalog/22407.

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

Council of Science Editors:

Shanks MF. Cavitation Modeling on the Automotive Torque Converter using Computational Fluid Dynamics with a Mixing Plane Approach. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22407

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

University of Waterloo

19. Taftian, Mahboubeh. Thermal Comfort Analysis Inside of a Recreational Vehicle.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/15588

► The focus of the current study is on the numerical investigation of airflow and temperature distribution in a representative Class B Recreational Vehicle (RV) with… (more)

Subjects/Keywords: CFD; Thermal Comfort; Recreational Vehicles; Computational fluid dynamics

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APA (6^th Edition):

Taftian, M. (2020). Thermal Comfort Analysis Inside of a Recreational Vehicle. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15588

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):

Taftian, Mahboubeh. “Thermal Comfort Analysis Inside of a Recreational Vehicle.” 2020. Thesis, University of Waterloo. Accessed February 26, 2021. http://hdl.handle.net/10012/15588.

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

MLA Handbook (7^th Edition):

Taftian, Mahboubeh. “Thermal Comfort Analysis Inside of a Recreational Vehicle.” 2020. Web. 26 Feb 2021.

Vancouver:

Taftian M. Thermal Comfort Analysis Inside of a Recreational Vehicle. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10012/15588.

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

Council of Science Editors:

Taftian M. Thermal Comfort Analysis Inside of a Recreational Vehicle. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15588

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

Penn State University

20. Lampenfield, Jacob John. Simulations of the flow generated by fluidic inserts in a converging diverging nozzle.

Degree: 2016, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/29170

► This investigation of military jet noise prediction and reduction is a continuation from previous projects and is still ongoing. Numerical simulations have been performed on… (more)

▼ This investigation of military jet noise prediction and reduction is a continuation from previous projects and is still ongoing. Numerical simulations have been performed on baseline nozzles and nozzles with the addition of fluidic inserts. The design Mach number of the nozzle is 1.65, but only the over-expanded Mach number of 1.36 has been analyzed. The fluidic inserts have been generated using different numbers of injectors and injector hole sizes. The supersonic military style jet simulation makes use of advanced meshes combined with CFD technology. Steady Reynolds-averaged Navier-Stokes (RANS) simulations are produced by the CFD technology and used to predict and understand the flow field. Through collaboration with experimental noise measurements, a correlation between flow field properties and noise reduction is examined. The ANSYS suite is used to create grids and run simulations by using ANSYS-ICEM and ANSYS-CFX respectively. The geometry of the nozzle is modeled using an unstructured hexahedral mesh. The Menter SST turbulence model with a wall function is used inside of the CFX-Solver. The objective is to further simulate a military-style nozzle, similar to the GE F404 family, with added fluidic inserts. Previous simulations have been conducted and new simulations were planned and performed based on information gathered from the previous simulations and experiments. The fluidic inserts are used to alter the flow field to achieve the same effect of hard wall corrugations, which have been shown to reduce noise levels. The numerical simulations are used to help understand the effects on the flow field created by the fluidic inserts and to attempt to find flow parameters that can be correlated to noise reduction. Simulations were first run on a simpler geometry to give an understanding of the fluidic inserts. They were conducted by having three injectors exhausting into a supersonic boundary layer. The freestream Mach number was 1.5 to simulate the inside of the nozzle. A study was then conducted to see the effect of a change in downstream injector angle on the fluidic insert. There was also a study of an increase Reynolds number as three different sized nozzles were modeled. The first size is a small nozzle with an exit diameter of 0.885 inches. The nozzle size was then increased by a factor of 1.2 to an exit diameter of 1.06 inches. A third nozzle was then modeled to recreate the nozzle used in the GE experiments. This nozzle had a diameter of 5.07 inches. The results from all the simulations were then compared to experimental acoustic data. Flow parameters were then integrated from each simulation to attempt to find a correlation to noise reduction. Parameters such as streamwise vorticity, turbulent kinetic energy, and Q criterion were all analyzed. Advisors/Committee Members: Philip John Morris, Thesis Advisor/Co-Advisor.

Subjects/Keywords: CFD; computational fluid dynamics; converging; diverging; nozzle; aeroacoustics; noise reduction

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

APA (6^th Edition):

Lampenfield, J. J. (2016). Simulations of the flow generated by fluidic inserts in a converging diverging nozzle. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/29170

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):

Lampenfield, Jacob John. “Simulations of the flow generated by fluidic inserts in a converging diverging nozzle.” 2016. Thesis, Penn State University. Accessed February 26, 2021. https://submit-etda.libraries.psu.edu/catalog/29170.

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

MLA Handbook (7^th Edition):

Lampenfield, Jacob John. “Simulations of the flow generated by fluidic inserts in a converging diverging nozzle.” 2016. Web. 26 Feb 2021.

Vancouver:

Lampenfield JJ. Simulations of the flow generated by fluidic inserts in a converging diverging nozzle. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Feb 26]. Available from: https://submit-etda.libraries.psu.edu/catalog/29170.

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

Council of Science Editors:

Lampenfield JJ. Simulations of the flow generated by fluidic inserts in a converging diverging nozzle. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/29170

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

Penn State University

21. Porzio, David Philip. MICRO-THROUGH-MACROSCALE FLUID-DYNAMICS MODELING OF HUMAN RESPIRATION .

Degree: 2011, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/11543

► This research contributes several elements to an existing and evolving multi-scale model of human respiration. This model takes patient’s medical scans (CT) and extracts the… (more)

▼ This research contributes several elements to an existing and evolving multi-scale model of human respiration. This model takes patient’s medical scans (CT) and extracts the airways into a surface geometry file and associated skeletonized data file. A semi-automated geometry algorithm truncates the airways and gives them generational assignments along with planar pressure boundaries at their desired outlets. A volume mesh is then generated from the surface mesh that can be used for respiration simulation. The planar pressure boundaries interact with a second mesh comprised of automatically generated Quasi-1D pipes representing the lower airways which saves considerable amounts of computational time. This research improved on several of these modeling components. New algorithms were developed, coded, and verified for truncation and generational assignment that are dependent on a separate attribute algorithm, which works in conjunction to replace the previous geometry tool. Also, new automated software tools were developed to create idealized CAD models and meshes for computational simulation to calculate the losses in sub-grid scale bifurcation regions that connect the Quasi-1D pipes in the lower airways. The truncation algorithms were shown to be more robust than their predecessor when dealing with very complex medical imagery; likewise, the associated generational assignment algorithm was shown to have increased accuracy when compared to the previous version. However, mixed success was obtained from the development of loss models for the sub-grid scale bifurcation regions. Computational simulations gave consistent values for the loss associated with these geometries and demonstrated that the flow and subsequent loss in the lower airways is dominated by viscous effects. Unfortunately as these losses were orders of magnitude smaller than the head loss in such flows, the inherent slight variations from mesh to mesh that arises when changing a feature for comparison are enough to obscure the trends from being properly resolved. Advisors/Committee Members: Robert Francis Kunz, Thesis Advisor/Co-Advisor, Robert Francis Kunz, Thesis Advisor/Co-Advisor.

Subjects/Keywords: computational fluid dynamics; cfd; multiscale; human respiration; macroscale; breathing; microscale

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APA (6^th Edition):

Porzio, D. P. (2011). MICRO-THROUGH-MACROSCALE FLUID-DYNAMICS MODELING OF HUMAN RESPIRATION . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/11543

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):

Porzio, David Philip. “MICRO-THROUGH-MACROSCALE FLUID-DYNAMICS MODELING OF HUMAN RESPIRATION .” 2011. Thesis, Penn State University. Accessed February 26, 2021. https://submit-etda.libraries.psu.edu/catalog/11543.

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

MLA Handbook (7^th Edition):

Porzio, David Philip. “MICRO-THROUGH-MACROSCALE FLUID-DYNAMICS MODELING OF HUMAN RESPIRATION .” 2011. Web. 26 Feb 2021.

Vancouver:

Porzio DP. MICRO-THROUGH-MACROSCALE FLUID-DYNAMICS MODELING OF HUMAN RESPIRATION . [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Feb 26]. Available from: https://submit-etda.libraries.psu.edu/catalog/11543.

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

Council of Science Editors:

Porzio DP. MICRO-THROUGH-MACROSCALE FLUID-DYNAMICS MODELING OF HUMAN RESPIRATION . [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/11543

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

Stellenbosch University

22. Louw, Francois George. Investigation of the flow field in the vicinity of an axial flow fan during low flow rates.

Degree: PhD, Mechanical and Mechatronic Engineering, 2015, Stellenbosch University

URL: http://hdl.handle.net/10019.1/97987

►

ENGLISH ABSTRACT: Large axial flow fans (≈9 m in diameter) are used in air-cooled heat exchangers (ACHEs). Adverse inflow conditions occur in these systems, especially… (more)

▼

ENGLISH ABSTRACT: Large axial flow fans (≈9 m in diameter) are used in air-cooled heat exchangers (ACHEs). Adverse inflow conditions occur in these systems, especially near the periphery of the air-cooled heat exchanger (ACHE) platform, affecting reduced flow rates through the fans located in these regions. The focus of the present study is to investigate the flow field in the vicinity of an axial flow fan during these low flow conditions, by means of experimentation and numerical analyses. A 1.542 m diameter model of an axial flow fan, termed the B2a-fan, is constructed and tested in a British standard 848, type A test facility to obtain its characteristic curves. A wireless system to conduct blade surface pressure measurements (BSPMs) on both the pressure and suction sides of a fan blade is also developed and implemented. An eighth sector of the fan is modelled using the commercial CFD code, ANSYS Fluent 14.0, for a range of flow rates. Pearson correlation factors of RP; Fs = 0:997 and RP; Fs = 0:990 are obtained for the respective characteristic curves of fan static pressure and static efficiency. Factors of RP;BSPM & 0:990 are obtained for more than 90% of the BSPMs along circumferential sections of a blade, at different radii. These correlations validate the numerical model. Flow field visualizations show that the flow field becomes more unstable as the flow rate through the fan is decreased with considerable increases in radial velocity. Instability starts near the blade root and progressively moves towards higher blade spans with a decrease in flow rate. A deviation occurs between the numerically calculated blade sectional lift and drag characteristics and the two-dimensional NASA LS 0413 aerofoil data at low flow rates. The highest blade sectional lift coefficients occur near the hub and decrease towards higher blade spans. An Euler turbo-machinery analysis of the flow field data shows that the component of Coriolis power is close to zero at near-design flow rates, whereas the aerodynamic power component is almost equal to the total power applied by the fan. However, as the ow rate decreases a gradual inversion of this characteristic is observed. Lastly, a new simplified fan model in the form of an actuator-disc model (ADM) is developed, termed the Reverse engineered empirical actuator-disc model (REEADM). This model implements the blade sectional lift, drag and radial force coefficients calculated from the CFD data. The results obtained from this model provides a fair comparison to the experimental fan characteristics at near-design flow rates, but a deviation is observed for low flow rates, although an improvement is made compared to the original ADM.

AFRIKAANSE OPSOMMING: Groot aksiaalvloeiwaaiers (≈ 9 m in deursnee) word geïmplementeer in lugverkoelde hitteruilers (LVHRs). Ongunstige invloeipatrone, wat veral naby die rante van 'n LVHR-platform voorkom, veroorsaak 'n afname in volumevloeitempo's deur die waaiers in hierdie omgewings. Dus is die fokus van die…

Advisors/Committee Members: Von Backstrom, T. W., Van der Spuy, S. J., Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Axial flow fans; Turbo machines; Computational fluid dynamics (CFD); UCTD

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

APA (6^th Edition):

Louw, F. G. (2015). Investigation of the flow field in the vicinity of an axial flow fan during low flow rates. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/97987

Chicago Manual of Style (16^th Edition):

Louw, Francois George. “Investigation of the flow field in the vicinity of an axial flow fan during low flow rates.” 2015. Doctoral Dissertation, Stellenbosch University. Accessed February 26, 2021. http://hdl.handle.net/10019.1/97987.

MLA Handbook (7^th Edition):

Louw, Francois George. “Investigation of the flow field in the vicinity of an axial flow fan during low flow rates.” 2015. Web. 26 Feb 2021.

Vancouver:

Louw FG. Investigation of the flow field in the vicinity of an axial flow fan during low flow rates. [Internet] [Doctoral dissertation]. Stellenbosch University; 2015. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10019.1/97987.

Council of Science Editors:

Louw FG. Investigation of the flow field in the vicinity of an axial flow fan during low flow rates. [Doctoral Dissertation]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/97987

Stellenbosch University

23. Kanyabujinja, Nshuti Placide. CFD modelling of ogee spillway hydraulics and comparison with physical model tests.

Degree: MEng, Civil Engineering, 2015, Stellenbosch University

URL: http://hdl.handle.net/10019.1/96787

►

ENGLISH ABSTRACT: Modern Computational Fluid Dynamics modelling (CFD) are becoming common design and analysis tools in the engineering field. Nowadays, project designs involve the use… (more)

▼

ENGLISH ABSTRACT: Modern Computational Fluid Dynamics modelling (CFD) are becoming common design and analysis tools in the engineering field. Nowadays, project designs involve the use of CFD techniques along with physical scale modelling to analyse the complex rapidly varied and turbulent flows which would not be easily analysed by physical modelling. In particular, the consideration and/or use of CFD modelling in the Hydraulic Engineering field remains on the increase. Apart from being used for comparison with other design techniques, CFD may in future become a standalone modelling technique in hydraulic structures design. This research aims to use CFD models to validate the simulation of the flow over two ogee dam spillways which are installed in the Hydraulic Laboratory of Stellenbosch University. To achieve this simulation of the flow which involves an interaction between water and air, the flow behaviour has been mapped by the Volume of Fluid (VOF) and the realisable "𝑘−𝜀" turbulence numerical models. The Volume of Fluid (VOF) and the realisable "𝑘−𝜀" models simulate the free surface of two-phase flow and the flow turbulence, respectively. Firstly, the study embarks with details on the actual design approaches of a typical ogee dam spillway. It subsequently presents the geometry and dimensions of the physical models, the testing procedure and the experimental test results achieved from this modelling exercise. For CFD modelling, a commercially available Computational Fluid Dynamics (CFD) package, Ansys-Fluent, was used. To model the physical model, the use of Reynolds-averaged Navier-Stokes equations in combination with the realisable k-ε eddy-viscosity closure model was adopted. The process of CFD model development and the underlying theory of it are discussed in this thesis. Different test scenarios including steady and fully hydrodynamic states simulation for two and three-dimensional geometries were considered in this simulation to achieve the most accurate results. In order to determine the required mesh size, the mesh sensitivity tests were conducted on the 2 dimensional and 3 dimensional models. Finally, the pressure readings and water levels produced by numerical models are discussed through a validation process by comparing the CFD model results with the results obtained from physical models. The outcome proved that CFD models are able to map the behaviour of both flow phases since they exhibited a close correlation to those achieved in the physical models. Even though some slight differences in values were revealed, the graphical trend remains reasonably similar for all test results.

AFRIKAANSE OPSOMMING: Moderne gerekenariseerde vloeidinamika numeriese modelle (CFD) word deesdae dikwels deur ingenieurs gebruik. Projekontwerpe sluit tans die gebruik van CFD tegnieke asook fisiese skaalmodellering in om komplekse, vinnig-veranderede en turbulente vloei te ontleed. Hierdie tipe vloeie is moeilik om met fisiese modellering te ontleed. Die gebruik van CFD numeriese modelle in hidrouliese…

Advisors/Committee Members: Basson, G. R., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..

Subjects/Keywords: Modern Computational Fluid Dynamics (CFD) modelling; Hydraulic engineering; UCTD

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

APA (6^th Edition):

Kanyabujinja, N. P. (2015). CFD modelling of ogee spillway hydraulics and comparison with physical model tests. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/96787

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):

Kanyabujinja, Nshuti Placide. “CFD modelling of ogee spillway hydraulics and comparison with physical model tests.” 2015. Thesis, Stellenbosch University. Accessed February 26, 2021. http://hdl.handle.net/10019.1/96787.

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

MLA Handbook (7^th Edition):

Kanyabujinja, Nshuti Placide. “CFD modelling of ogee spillway hydraulics and comparison with physical model tests.” 2015. Web. 26 Feb 2021.

Vancouver:

Kanyabujinja NP. CFD modelling of ogee spillway hydraulics and comparison with physical model tests. [Internet] [Thesis]. Stellenbosch University; 2015. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10019.1/96787.

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

Council of Science Editors:

Kanyabujinja NP. CFD modelling of ogee spillway hydraulics and comparison with physical model tests. [Thesis]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/96787

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

University of Toronto

24. Lin, Wei-Chih Patrick. Cavopulmonary Assist Device to Bridge Failing Fontan Circulations.

Degree: 2018, University of Toronto

URL: http://hdl.handle.net/1807/89608

►

A novel cavopulmonary assist strategy with a multi-lumen cannula powered by an external centrifugal pump is proposed for use in failing Fontan patients. Steady-state computational… (more)

Subjects/Keywords: Cavopulmonary Assist; Computational Fluid Dynamics (CFD); Fontan; Hemolysis Index; 0541

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APA (6^th Edition):

Lin, W. P. (2018). Cavopulmonary Assist Device to Bridge Failing Fontan Circulations. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/89608

Chicago Manual of Style (16^th Edition):

Lin, Wei-Chih Patrick. “Cavopulmonary Assist Device to Bridge Failing Fontan Circulations.” 2018. Masters Thesis, University of Toronto. Accessed February 26, 2021. http://hdl.handle.net/1807/89608.

MLA Handbook (7^th Edition):

Lin, Wei-Chih Patrick. “Cavopulmonary Assist Device to Bridge Failing Fontan Circulations.” 2018. Web. 26 Feb 2021.

Vancouver:

Lin WP. Cavopulmonary Assist Device to Bridge Failing Fontan Circulations. [Internet] [Masters thesis]. University of Toronto; 2018. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1807/89608.

Council of Science Editors:

Lin WP. Cavopulmonary Assist Device to Bridge Failing Fontan Circulations. [Masters Thesis]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/89608

University of Pretoria

25. Moghimi Ardekani, Mohammad. Optical thermal and economic optimisation of a linear Fresnel collector.

Degree: PhD, Mechanical and Aeronautical Engineering, 2017, University of Pretoria

URL: http://hdl.handle.net/2263/61313

► Solar energy is one of a very few low-carbon energy technologies with the enormous potential to grow to a large scale. Currently, solar power is… (more)

▼ Solar energy is one of a very few low-carbon energy technologies with the enormous potential to grow to a large scale. Currently, solar power is generated via the photovoltaic (PV) and concentrating solar power (CSP) technologies. The ability of CSPs to scale up renewable energy at the utility level, as well as to store energy for electrical power generation even under circumstances when the sun is not available (after sunset or on a cloudy day), makes this technology an attractive option for sustainable clean energy. The levelised electricity cost (LEC) of CSP with thermal storage was about 0.16-0.196 Euro/kWh in 2013 (Kost et al., 2013). However, lowering LEC and harvesting more solar energy from CSPs in future motivate researchers to work harder towards the optimisation of such plants. The situation tempts people and governments to invest more in this ultimate clean source of energy while shifting the energy consumption statistics of their societies from fossil fuels to solar energy. Usually, researchers just concentrate on the optimisation of technical aspects of CSP plants (thermal and/or optical optimisation). However, the technical optimisation of a plant while disregarding economic goals cannot produce a fruitful design and in some cases may lead to an increase in the expenses of the plant, which could result in an increase in the generated electrical power price. The study focused on a comprehensive optimisation of one of the main CSP technology types, the linear Fresnel collector (LFC). In the study, the entire LFC solar domain was considered in an optimisation process to maximise the harvested solar heat flux throughout an imaginary summer day (optical goal), and to minimise cavity receiver heat losses (thermal goal) as well as minimising the manufacturing cost of the plant (economic goal). To illustrate the optimisation process, an LFC was considered with 12 design parameters influencing three objectives, and a unique combination of the parameters was found, which optimised the performance. In this regard, different engineering tools and approaches were introduced in the study, e.g., for the calculation of thermal goals, Computational Fluid Dynamics (CFD) and view area approaches were suggested, and for tackling optical goals, CFD and Monte-Carlo based ray-tracing approaches were introduced. The applicability of the introduced methods for the optimisation process was discussed through case study simulations. The study showed that for the intensive optimisation process of an LFC plant, using the Monte Carlo-based ray-tracing as high fidelity approach for the optical optimisation objective, and view area as a low fidelity approach for the thermal optimisation objective, made more sense due to the saving in computational cost without sacrificing accuracy, in comparison with other combinations of the suggested approaches. The study approaches can be developed for the optimisation of other CSP technologies after some modification and manipulation. The techniques provide alternative options for future… Advisors/Committee Members: Craig, K.J. (Kenneth) (advisor), Meyer, Josua P. (coadvisor).

Subjects/Keywords: UCTD; Computational fluid dynamics (CFD); ANSYS DX; ANSYS Fluent; Ray tracing

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

APA (6^th Edition):

Ardekani, Mohammad, M. (2017). Optical thermal and economic optimisation of a linear Fresnel collector. (Doctoral Dissertation). University of Pretoria. Retrieved from http://hdl.handle.net/2263/61313

Chicago Manual of Style (16^th Edition):

Ardekani, Mohammad, Moghimi. “Optical thermal and economic optimisation of a linear Fresnel collector.” 2017. Doctoral Dissertation, University of Pretoria. Accessed February 26, 2021. http://hdl.handle.net/2263/61313.

MLA Handbook (7^th Edition):

Ardekani, Mohammad, Moghimi. “Optical thermal and economic optimisation of a linear Fresnel collector.” 2017. Web. 26 Feb 2021.

Vancouver:

Ardekani, Mohammad M. Optical thermal and economic optimisation of a linear Fresnel collector. [Internet] [Doctoral dissertation]. University of Pretoria; 2017. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/2263/61313.

Council of Science Editors:

Ardekani, Mohammad M. Optical thermal and economic optimisation of a linear Fresnel collector. [Doctoral Dissertation]. University of Pretoria; 2017. Available from: http://hdl.handle.net/2263/61313

26. Μπακάλης, Παντελεήμων. Υπολογιστική επίλυση προβλημάτων μαγνητορευστοδυναμικής και θερμικής ροής υγρών μετάλλων εντός αγωγών.

Degree: 2012, University of Patras

URL: http://hdl.handle.net/10889/6147

►

Αντικείμενο της παρούσας διδακτορικής διατριβής αποτέλεσε η ανάπτυξη μιας ακριβούς υπολογιστικής μεθοδολογίας για τη μελέτη της μαγνητοϋδροδυναμικής και θερμικής ροής ενός ηλεκτρικώς αγώγιμου ρευστού υπό… (more)

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Αντικείμενο της παρούσας διδακτορικής διατριβής αποτέλεσε η ανάπτυξη μιας ακριβούς υπολογιστικής μεθοδολογίας για τη μελέτη της μαγνητοϋδροδυναμικής και θερμικής ροής ενός ηλεκτρικώς αγώγιμου ρευστού υπό την επίδραση ενός εξωτερικού μαγνητικού πεδίου, για μεγάλο φάσμα τιμών των παραμέτρων της ροής. Η μελέτη της διαμόρφωσης της μαγνητορευστοδυναμικής και θερμικής ροής των ηλεκτρικώς αγώγιμων ρευστών, όπως είναι τα υγρά μέταλλα, υπό την επίδραση της εφαρμογής ενός εξωτερικού μαγνητικού πεδίου, είναι ιδιαίτερα σημαντική για την εκτίμηση της μείωσης της αξονικής βαθμίδας της πίεσης, του συντελεστή μεταφοράς θερμότητας και άλλων φυσικών ποσοτήτων, σε μια σειρά προβλημάτων όπως είναι η σταθεροποίηση και ο περιορισμός του πλάσματος, η ψύξη των αντιδραστήρων σύντηξης με υγρά μέταλλα, η χύτευση μετάλλων με ηλεκτρομαγνητικά μέσα, η χρήση ηλεκτρομαγνητικών αντλιών για υγρά μέταλλα, στη γεωλογία, για τη μελέτη του εσωτερικού της Γης, και στην αστροφυσική όπου μελετώνται μεταξύ άλλων αστέρες, νεφελώματα και σχετικιστικά τζετ. Η ροή θεωρείται ασυμπίεστη και στρωτή, ενώ μελετάται για τις περιπτώσεις της πλήρως ανεπτυγμένης και της αναπτυσσόμενης ροή στην περιοχή μεταξύ δύο ομοαξονικών ευθύγραμμων ή καμπύλων αγωγών κυκλικής διατομής, υπό την επίδραση ισχυρού εξωτερικού μαγνητικού πεδίου. Τα τοιχώματα των αγωγών είναι ηλεκτρικώς μονωμένα και ανάλογα με το πρόβλημα βρίσκονται σε διαφορετικές σταθερές θερμοκρασίες ή σε διαφορετικές ροές θερμότητας. Από τα αποτελέσματα προέκυψε πως το μαγνητικό πεδίο έχει πολύ σημαντική επίδραση στην κατανομή της ταχύτητας και στην πτώση πίεσης, ενώ η επίδραση του στη μετάδοση θερμότητας στην περίπτωση των υγρών μετάλλων είναι μηδαμινή.

The aim of the present doctorate thesis was the development of an accurate και robust computational methodology for the study of the magnetohydrodynamic flow of an electrically conducting fluid under the effect of an external magnetic field, for large regions of values of the parameters of the flow. The study of the magnetohydrodynamic και thermal flow of an electrically conducting fluid, such as liquid metals, is very important for the estimation of the pressure drop, the heat transfer coefficient και other physical quantities in several engineering applications such as stabilization και control of plasma, fusion reactor blankets, metallurgy, electromagnetic pumps, geology for the study of the inner core of the earth και astrophysics where stars, nebula και relativity jets are studied. The flow is considered as incompressible και laminar και it is studied for the cases of the fully developed και the developing flow in the region between two homoaxial straight or curved ducts of circular cross-sections, under the effect of an external magnetic field. The duct walls are considered as electrically insulated και maintained at uniform temperatures or uniform heat fluxes. The results show that the magnetic field has a significant effect on the velocity distribution και the pressure drop και a minor effect on the heat transfer.

Advisors/Committee Members: Χατζηκωνσταντίνου, Παύλος, Bakalis, Panteleimon, Χατζηκωνσταντίνου, Παύλος, Περδίος, Ευστάθιος, Ντούσκος, Χρήστος, Μάργαρης, Διονύσιος, Σιακαβέλλας, Νικόλαος, Λουκόπουλος, Βασίλειος, Βαφέας, Παναγιώτης.

Subjects/Keywords: Υπολογιστική ρευστομηχανική; Μαγνητοϋδροδυναμική; 538.6; Computational fluid dynamics (CFD); Magnetohydrodynamics (MHD)

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

APA (6^th Edition):

Μπακάλης, �. (2012). Υπολογιστική επίλυση προβλημάτων μαγνητορευστοδυναμικής και θερμικής ροής υγρών μετάλλων εντός αγωγών. (Doctoral Dissertation). University of Patras. Retrieved from http://hdl.handle.net/10889/6147

Chicago Manual of Style (16^th Edition):

Μπακάλης, Παντελεήμων. “Υπολογιστική επίλυση προβλημάτων μαγνητορευστοδυναμικής και θερμικής ροής υγρών μετάλλων εντός αγωγών.” 2012. Doctoral Dissertation, University of Patras. Accessed February 26, 2021. http://hdl.handle.net/10889/6147.

MLA Handbook (7^th Edition):

Μπακάλης, Παντελεήμων. “Υπολογιστική επίλυση προβλημάτων μαγνητορευστοδυναμικής και θερμικής ροής υγρών μετάλλων εντός αγωγών.” 2012. Web. 26 Feb 2021.

Vancouver:

Μπακάλης �. Υπολογιστική επίλυση προβλημάτων μαγνητορευστοδυναμικής και θερμικής ροής υγρών μετάλλων εντός αγωγών. [Internet] [Doctoral dissertation]. University of Patras; 2012. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10889/6147.

Council of Science Editors:

Μπακάλης �. Υπολογιστική επίλυση προβλημάτων μαγνητορευστοδυναμικής και θερμικής ροής υγρών μετάλλων εντός αγωγών. [Doctoral Dissertation]. University of Patras; 2012. Available from: http://hdl.handle.net/10889/6147

Colorado State University

27. Barnett, Taylor C. Flow dynamics and scalar transport in drinking water contact tanks.

Degree: MS(M.S.), Civil and Environmental Engineering, 2013, Colorado State University

URL: http://hdl.handle.net/10217/79006

► The research and studies presented in this thesis focus on ways to improve the internal hydraulics of chlorine contact tanks used in drinking water disinfection… (more)

▼ The research and studies presented in this thesis focus on ways to improve the internal hydraulics of chlorine contact tanks used in drinking water disinfection systems. This was accomplished through the use of computational fluid dynamics (CFD) and physical tracer studies of a number of different systems. Three primary tank modifications were investigated in these studies: internal baffling; inlet modifications; and random packing material. The findings from these studies were then applied in a case study of the Jamestown chlorine contact tank. All of the studies presented in this thesis use the baffle factor (BF) designation as defined by the United States Environmental Protection Agency as the primary indicator of a system's disinfection efficiency. The CFD models used for the internal baffling study were first validated using a laboratory scale study of the Embsay chlorine contact tank in Yorkshire, England. This tank footprint was then modified to replicate a precast concrete tank that was installed in the Hydraulics Laboratory located at the Engineering Research Center (ERC) at Colorado State University. This concrete tank was used as the footprint for a parametric study in which the number and length of internal baffles were modeled in various configurations. The internal hydraulics of this baffle tank were optimized using only two dimensionless relationships namely: the baffle opening ratio L* and the baffle opening to channel width ratio Lbo/Wch. The resulting tank geometry from these two relationships yielded a BF of 0.80 and also maximized the length to width ratio of each channel within the concrete tank. The inlet modification study was performed to investigate how the BF of a 400-gallon doorway storage tank could be improved. Three different inlet types with two inlet sizes were modeled and simulated for six different flow rates. Three of these CFD simulations were then physically tested using both saline and lithium tracers to validate the computer models. Key findings from this study show that the size of the inlet and its orientation play a dominant role in the internal hydraulics of the system. For the random packing material study, three different packing material sizes, two tank sizes, and two different flow rates were tested. CFD models were not feasible due to the randomness of how the packing material would settle in these contact tanks. Over 64 saline tracer studies and 6 lithium tracer studies were conducted to complete this study. Key findings show that the initial BF of the system and the volume of the tank filled with the packing material were the dominant variables in the study. The tank size, flow rate, and packing material size had little to no impact on the performance. The Jamestown case study presented in this thesis used findings from both the internal baffle study and the inlet modification study. The BF of the contact tank would fluctuate annually between 0.52 and 0.63 due to a shift in flow regimes caused by a change in the system's flow rate. This turbulent to laminar flow… Advisors/Committee Members: Venayagamoorthy, Subhas Karan (advisor), Julien, Pierre Y. (committee member), Sakura, Hiroshi (committee member).

Subjects/Keywords: baffle; CFD; computational fluid dynamics; contact tank; packing material; water treatment

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

APA (6^th Edition):

Barnett, T. C. (2013). Flow dynamics and scalar transport in drinking water contact tanks. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/79006

Chicago Manual of Style (16^th Edition):

Barnett, Taylor C. “Flow dynamics and scalar transport in drinking water contact tanks.” 2013. Masters Thesis, Colorado State University. Accessed February 26, 2021. http://hdl.handle.net/10217/79006.

MLA Handbook (7^th Edition):

Barnett, Taylor C. “Flow dynamics and scalar transport in drinking water contact tanks.” 2013. Web. 26 Feb 2021.

Vancouver:

Barnett TC. Flow dynamics and scalar transport in drinking water contact tanks. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/10217/79006.

Council of Science Editors:

Barnett TC. Flow dynamics and scalar transport in drinking water contact tanks. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/79006

University of Toronto

28. Tse, Leonard. Computational Fluid Dynamics Modeling of Redundant Stent-graft Configurations in Endovascular Aneurysm Repair.

Degree: 2010, University of Toronto

URL: http://hdl.handle.net/1807/25830

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During endovascular aneurysm repair (EVAR), if the stent-graft device is too long for a given patient the redundant (extra) length adopts a convex configuration in… (more)

Subjects/Keywords: endovascular; aneurysm; computational fluid dynamics; CFD; EVAR; redundancy; stent-graft; 0541

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

APA (6^th Edition):

Tse, L. (2010). Computational Fluid Dynamics Modeling of Redundant Stent-graft Configurations in Endovascular Aneurysm Repair. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/25830

Chicago Manual of Style (16^th Edition):

Tse, Leonard. “Computational Fluid Dynamics Modeling of Redundant Stent-graft Configurations in Endovascular Aneurysm Repair.” 2010. Masters Thesis, University of Toronto. Accessed February 26, 2021. http://hdl.handle.net/1807/25830.

MLA Handbook (7^th Edition):

Tse, Leonard. “Computational Fluid Dynamics Modeling of Redundant Stent-graft Configurations in Endovascular Aneurysm Repair.” 2010. Web. 26 Feb 2021.

Vancouver:

Tse L. Computational Fluid Dynamics Modeling of Redundant Stent-graft Configurations in Endovascular Aneurysm Repair. [Internet] [Masters thesis]. University of Toronto; 2010. [cited 2021 Feb 26]. Available from: http://hdl.handle.net/1807/25830.

Council of Science Editors:

Tse L. Computational Fluid Dynamics Modeling of Redundant Stent-graft Configurations in Endovascular Aneurysm Repair. [Masters Thesis]. University of Toronto; 2010. Available from: http://hdl.handle.net/1807/25830

Delft University of Technology

29. Kunnen, Jeroen (author). Numerical study of adaptive mesh refinement applied to a third order minimum truncation error Active Flux method.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:6a757d43-1417-477c-8815-0b78eb0d4927

► In 2011 a relatively new type of numerical scheme has been introduced: Active Flux schemes. In this type of scheme an extra degree of freedom… (more)

Subjects/Keywords: Computational Fluid Dynamics (CFD); active flux; adaptive mesh refinement

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

APA (6^th Edition):

Kunnen, J. (. (2018). Numerical study of adaptive mesh refinement applied to a third order minimum truncation error Active Flux method. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6a757d43-1417-477c-8815-0b78eb0d4927

Chicago Manual of Style (16^th Edition):

Kunnen, Jeroen (author). “Numerical study of adaptive mesh refinement applied to a third order minimum truncation error Active Flux method.” 2018. Masters Thesis, Delft University of Technology. Accessed February 26, 2021. http://resolver.tudelft.nl/uuid:6a757d43-1417-477c-8815-0b78eb0d4927.

MLA Handbook (7^th Edition):

Kunnen, Jeroen (author). “Numerical study of adaptive mesh refinement applied to a third order minimum truncation error Active Flux method.” 2018. Web. 26 Feb 2021.

Vancouver:

Kunnen J(. Numerical study of adaptive mesh refinement applied to a third order minimum truncation error Active Flux method. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Feb 26]. Available from: http://resolver.tudelft.nl/uuid:6a757d43-1417-477c-8815-0b78eb0d4927.

Council of Science Editors:

Kunnen J(. Numerical study of adaptive mesh refinement applied to a third order minimum truncation error Active Flux method. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:6a757d43-1417-477c-8815-0b78eb0d4927

Delft University of Technology

30. De Jong, R.H. (author). A Numerical trimvariation study for ships operating in off-design conditions.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:de6e82b5-28f1-4a7d-a073-032620a88b60

► Fuel efficiency is an important factor for the shipping industry both regarding new build vessels and existing vessels. A method to reduce the fuel consumption… (more)

▼ Fuel efficiency is an important factor for the shipping industry both regarding new build vessels and existing vessels. A method to reduce the fuel consumption of existing vessels operating in off design conditions is to trim a vessel in the most optimum trim condition. The current approach to determine the most efficient trim condition is to perform propulsion tests under different trim conditions in a towing tank. To determine the usability of the CFD program PARNASSOS a trim variation study is performed on a vessel that is already tested in one of the tanks of MARIN. The trend of the propulsion from the tank tests is used to validate the trend of the resistance from the CFD calculations. Before validating the trend of the resistance with the trend of the propulsion it was checked whether or not the change of the resistance is dominant over the change in propulsive efficiency. It turned out that the change of the resistance is dominant over the change of the propulsive efficiency and therefore the trend of the propulsive power can be used to validate the trend of the resistance. The uncertainty of the CFD calculations is determined using a grid refinement study according to the method developed by Luis Eça and Martin Hoekstra [Eça andHoekstra, 2014]. According to this method the uncertainty of the performed calculations is estimated at 3.5%. The uncertainty of the tank tests is estimated at 0.9% according to Martijn van Rijsbergen [van Rijsbergen, 2014]. Unfortunately the uncertainty value obtained using the current method for estimating the uncertainty is not small enough to validate the trend of the resistance with the trend of the propulsion from the towing tank tests. The fact that the uncertainty determined is not small enough to validate the trend obtained from the CFD calculations doesn’t necessarily invalidate the assumption that the results of the CFD calculations are correct. It is expected that the uncertainty of the difference is smaller than the relative uncertainty, an expectation that is supported by the fact that the fits of the power series estimation for the resistance coefficients of the even keel condition and the 1.5m aft trim condition show the same trend and the two fits do not cross each other. There are at least two ways to further reduce the estimate of the uncertainty. The first one is to use finer grids. The second one is to further optimize the method to determine the uncertainty of these CFD calculations and reduce the influence of data scatter and non-similarity of the grids on the estimate of the uncertainty. The results of the CFD calculations are analyzed as if the data is validated. Trimming the vessel aft resulted in an increase of the total resistance. Trimming the vessel forward reduced the total resistance. The total resistance, the frictional resistance and the hydrodynamic pressure resistance increase when the vessel is trimmed aft while the hydrostatic pressure resistance reduces. These results show that the change in frictional resistance and the hydrodynamic pressure… Advisors/Committee Members: Veldhuis, H.J. (mentor).

Subjects/Keywords: CFD; Computational Fluid Dynamics; Trim Variation; Hull Flow; Physical explanation; Validation

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

APA (6^th Edition):

De Jong, R. H. (. (2015). A Numerical trimvariation study for ships operating in off-design conditions. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:de6e82b5-28f1-4a7d-a073-032620a88b60

Chicago Manual of Style (16^th Edition):

De Jong, R H (author). “A Numerical trimvariation study for ships operating in off-design conditions.” 2015. Masters Thesis, Delft University of Technology. Accessed February 26, 2021. http://resolver.tudelft.nl/uuid:de6e82b5-28f1-4a7d-a073-032620a88b60.

MLA Handbook (7^th Edition):

De Jong, R H (author). “A Numerical trimvariation study for ships operating in off-design conditions.” 2015. Web. 26 Feb 2021.

Vancouver:

De Jong RH(. A Numerical trimvariation study for ships operating in off-design conditions. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Feb 26]. Available from: http://resolver.tudelft.nl/uuid:de6e82b5-28f1-4a7d-a073-032620a88b60.

Council of Science Editors:

De Jong RH(. A Numerical trimvariation study for ships operating in off-design conditions. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:de6e82b5-28f1-4a7d-a073-032620a88b60

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