Dissertations / Theses on the topic 'CFD design'
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Vangbo, Petter Olav. "CFD in conceptual ship design." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15480.
Full textGraysmith, J. L. "Using CFD in engine design." Thesis, University of Warwick, 1995. http://wrap.warwick.ac.uk/4252/.
Full textThompson, Peter Mark. "Computation of CAD-based design velocities for aerodynamic design optimisation with adjoint CFD data." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675476.
Full textShi, Yijian. "Off-design waverider flowfield CFD simulation /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9717164.
Full textKing, Matthew Lee. "A CAD-centric Approach to CFD Analysis With Discrete Features." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd570.pdf.
Full textPulugundla, Gautam. "CFD design analysis of ventilated disc brakes." Thesis, Cranfield University, 2008. http://dspace.lib.cranfield.ac.uk/handle/1826/6578.
Full textMacchion, Olivier. "CFD in the design of gas quenching furnace." Doctoral thesis, Stockholm : Department of Mechanics, Royal Institute of Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-239.
Full textGuiza, Ghalia. "Reliable and Adaptive CFD Framework for Airship Design." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM021.
Full textThis thesis is devoted to the modeling and the numerical simulation of unsteady, turbulent flows relevant to external aerodynamic applications. The proposed study aims at developing methods suited to incompressible, monophase and multiphase flows around various slender and non-slender bodies. The latter rely on the Variational Multiscale (VMS) stabilized finite element method, that introduces an a priori decomposition of the solution into coarse and fine scale components. The general idea is that only the large scales are fully represented and resolved at the discrete level, while the effect of the small unresolved scales is taken into account by means of consistently derived source terms proportional to the residual of the resolved scale solution. An automatic procedure is used to build complex meshes combining a multilayer inner region structured according to the boundary layer theory, and an external non-structured region refined using a VMS error estimator under the constraint of a fixed number of nodes. For cases involving several immiscible phases, an advanced level-set method is used to accurately follow the interfaces while accounting for surface tension effects. The coupling between these various components into a unified formulation, and their implementation in a context of high performance computing, make for the novelty and the main objective of this thesis. Several test-cases in two and three dimensions are presented to assess the accuracy and the robustness of the proposed methods. The solver is then used to analyze the aerodynamics of the Stratobus, a stratospheric airship designed by Thalès Alenia Space for a wide range of civilian and military operations. In the permanent regime, a rigid envelope assumption allows predicting the forces exerted on the structure in good agreement with the experiments. The effect of a lighter-than-air ballonet slosh located in the hull is also simulated to characterize the airship dynamics during take-off
Lanchman, Troy J. "Using CFD to Improve Off-Design Throughflow Analysis." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1559828068015963.
Full textPoutiainen, Aaron. "Undertray Design and Development Procedure with CFD : An Optimization Study of Different UndertrayDesigns with CFD Computations." Thesis, KTH, Strömningsmekanik och Teknisk Akustik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301732.
Full textTävlingsbilars aerodynamik has spelat en viktig roll för att förbättra varvtiderna under åren inom motorsport. Att ha god väghäftning med 'slicks' däck och aerodynamisk nedåtkraft kommer att öka fordonets maximala sidokraft förmåga och därmed kan högre hastigheter i kurvor uppnås. Underredet och diffusern är den mest effektiva aerodynamiska komponenten på de flesta racerfordon och kan producera sex gånger mer nedåtkraft än dess bidrag till luftmotståndet och, om den optimeras korrekt, kan den avsevärt minska fordonets luftmotståndskoefficient. Syftet med detta projekt är att optimera en helt unik underredes design för KTH Formula Student lagets racingfordon DeV17. Underredet är inspirerat av Aston MArtin Valkyrie venturitunnel design och optimeras av iterativ förändring av CAD designparametrar för tre olika chassidesigner. Resultaten erhålls med CFD RANS-simuleringar med turbulensmodellen k-ω (SST) och programvaran Siemens Star-CCM+. Den optimala designen gav 530 N och 90 N nedåtkraft respektive luftmotstånd under en hastighet på 80 km/h. Venturitunnel designen har visat sig ge en förbättring på 29% nedåtkraft jämfört med en konventionell platt design, med starkare längsgående virvlar och lägre, mer utbredd, minimitryckfördelning. De viktigaste aspekterna som påverkar nedåtkraft i underredes designen dras som slutsats till att vara diffuser utloppets höjd, upphöjning vinkeln och fordonets markfrigång. Inga specifika aerodynamiska fördelar med att ha en konvergerande avsmalning av tunnelns tvärsnitt obververades, vilket innebär att underredet kan antas endast bestå av en expanderande diffuser. Tunneldesignen anser ge lovande bantestresultat och vara en gnista för ytterliga innovativa idéer inom aerodynamisk design för både bil- och racingindustrin.
McCormick, Daniel John. "An Analysis of Using CFD in Conceptual Aircraft Design." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33409.
Full textMaster of Science
Alexakis, Thanos. "CFD modelling of Stirling engines with complex design topologies." Thesis, Northumbria University, 2013. http://nrl.northumbria.ac.uk/26308/.
Full textMisra, John Satprim. "Considering value of information when using CFD in design." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1473234.
Full textOzden, Ender. "Detailed Design Of Shell-and-tube Heat Exchangers Using Cfd." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608752/index.pdf.
Full textBaten, Jasper Martijn van. "CFD: a design and scale-up tool for multiphase reactors." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/55357.
Full textKing, Philip Thomas. "CFD as a design tool for DLE gas turbine combustion." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535121.
Full textKalua, Amos. "Framework for Integrated Multi-Scale CFD Simulations in Architectural Design." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/105013.
Full textDoctor of Philosophy
The use of natural ventilation strategies in building design has been identified as one viable pathway toward minimizing energy consumption in buildings. Natural ventilation can also reduce the prevalence of the Sick Building Syndrome (SBS) and enhance the productivity of building occupants. This research study sought to develop a framework that can improve the usage of Computational Fluid Dynamics (CFD) analyses in the architectural design process for purposes of enhancing the efficiency of natural ventilation strategies in buildings. CFD is a branch of computational physics that studies the behaviour of fluids as they move from one point to another. The usage of CFD analyses in architectural design requires the input of wind environment data such as direction and velocity. Presently, this data is obtained from a weather station and there is an assumption that this data remains the same even for a building site located at a considerable distance away from the weather station. This potentially compromises the accuracy of the CFD analyses as studies have shown that due to a number of factors such the urban built form, vegetation, terrain and others, the wind environment is bound to vary from one point to another. This study sought to develop a framework that quantifies this variation and provides a way for translating the wind data obtained from a weather station to data that more accurately characterizes a local building site. With this accurate site wind data, the CFD analyses can then provide more meaningful insights into the use of natural ventilation in the process of architectural design. This newly developed framework was deployed on a study site at Virginia Tech. The findings showed that the framework was able to demonstrate that the wind flow field varies from one place to another and it also provided a way to capture this variation, ultimately, generating a wind flow field characterization that was more representative of the local conditions.
Litchwark, James Oliver. "Baghouse design for milk powder collection." Thesis, University of Canterbury. Chemical and Process Engineering, 2015. http://hdl.handle.net/10092/10208.
Full textTomac, Maximilian. "Adaptive-fidelity CFD for predicting flying qualities in preliminary aircraft design." Licentiate thesis, KTH, Aerodynamik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31400.
Full textQC 20110314
Fischer, Charles H. "Investigating the potential of CFD in sieve tray design and optimisation." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302168.
Full textNoor, Mohamed Sulfickerali. "Efficient CFD based aero-thermo-mechanical modelling for aircraft engine design." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813497/.
Full textKang, Guosheng. "Enhanced design for oxy-fuel fired batch tanks using CFD methods." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1551.
Full textTitle from document title page. Document formatted into pages; contains x, 153 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 150-153).
MARQUES, F. B. "INVESTIGAÇÃO DE DESIGN DE FILTRO MANGA ATRAVÉS DA TÉCNICA DE CFD." Universidade Federal do Espírito Santo, 2017. http://repositorio.ufes.br/handle/10/8448.
Full textAs técnicas de CFD foram aplicadas para o estudo de projeto de Filtro de Mangas. O intuito de utilizar essa ferramenta é devido ao seu baixo custo, em relação a testes experimen-tais, confiabilidade e tempo de respostas. Portanto, foi realizado um estudo para determinação da influência do design de entrada de ar, variação de velocidade de entrada e supressão de mangas para fazer uma análise de como essas variáveis influenciam na fluidodinâmica do filtro. Para avaliar o desempenho dos filtros de mangas foram simuladas três diferentes posições de alimentação, feita a variação da velocidade de entrada para avaliação do maior aproveitamento da área filtrante do meio e alteração na disposição das mangas do meio filtrante. Para tanto, utilizou-se o modelo de escoamento monofásico isotérmico e incompressível com a turbulência sendo tratada pelo modelo k-ε realizável. Pôde-se concluir que a alimentação Simples apresen-tou uma distribuição mais homogênea de velocidade, pressão e com um bom aproveitamento do meio filtrante, representando assim uma opção mais vantajosa de entrada quando comparada as demais propostas. No caso de supressão de mangas, a entrada Simples com configuração Alternada apresentou melhor desempenho, com uma redução de 43,9% da área originalmente proposta, proporcionando melhor aproveitamento do filtro, com menores velocidades de im-pactos e queda de pressão, e distribuição mais homogênea da velocidade no meio. Palavras-Chave: Filtro Manga, Filtração de Gás, CFD, Supressão.
Abhay, Srinivas. "Novel Compressor Blade Design Study." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439279520.
Full textSeemann, Patrick. "Design of 120cc Single Cylinder Experimental Engine for Analysis of Intake Swirl and Multiple Ignition Sites." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_theses/219.
Full textOkyay, Gizem. "Utilization Of Cfd Tools In The Design Process Of A Francis Turbine." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612452/index.pdf.
Full textErling, Fredrik. "Static CFD analysis of a novel valve design for internal combustion engines." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15521.
Full textKatea, Billy. "CFD Analysis of Air Flow Through a New Design For an Outlet Louver of a Cooling System : CFD Analys av luftflödet genom en ny design för utloppet i ett kylsystem." Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62647.
Full textHunter, William. "Actuator disk methods for tidal turbine arrays." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:bf8e95df-9e67-4c89-8d9d-1a608a8be0f4.
Full textKnill, Duane L. "Implementing Aerodynamic Predictions from Computational Fluid Dynamics in Multidisciplinary Design Optimization of a High-Speed Civil Transport." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29530.
Full textPh. D.
Shelley, Jonathan Knighton. "Incorporating Computational Fluid Dynamics Into The Preliminary Design Cycle." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd979.pdf.
Full textLee, Yeon-Seung. "Trend validation of CFD prediction results for ship design (based on series 60)." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96947587X.
Full textLapuh, Rok. "Mesh Morphing Technique used with Open-Source CFD Toolbox in Multidisciplinary Design Optimisation." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-348873.
Full textPettersson, Karl. "Scaling techniques using CFD and wind tunnel measurements for use in aircraft design." Licentiate thesis, Stockholm : Department of Aeronautical and Vehicle Engineering, Royal Institute of Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4122.
Full textPetrov, Todor P. "DEVELOPMENT OF INDUSTRY ORIENTED CFD CODE FOR ANALYSIS / DESIGN OF FACE VENTILATION SYSTEMS." UKnowledge, 2014. http://uknowledge.uky.edu/mng_etds/12.
Full textVarghese, Panthalookaran [Verfasser]. "CFD-assisted Characterization and Design of Hot Water Seasonal Heat Stores / Panthalookaran Varghese." Aachen : Shaker, 2007. http://d-nb.info/1166510077/34.
Full textPierson, S. R. "Application of commercial CFD to improve gasoline port fuel injector design and targeting." Thesis, Cranfield University, 2002. http://dspace.lib.cranfield.ac.uk/handle/1826/11426.
Full textPanthalookaran, Varghese [Verfasser]. "CFD-assisted Characterization and Design of Hot Water Seasonal Heat Stores / Panthalookaran Varghese." Aachen : Shaker, 2007. http://nbn-resolving.de/urn:nbn:de:101:1-2018090906162432057604.
Full textCogan, Donavan. "The aerodynamic design and development of an urban concept vehicle through CFD analysis." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2386.
Full textThis work presents the computational uid dynamics (CFD) analysis of a light road vehicle. Simulations are conducted using the lattice Boltzmann method (LBM) with the wall adapting local eddy (WALE) turbulence model. Simulations include and compare the use of a rolling road, rotating wheels, adaptive re nement as well as showing comparison with a Reynolds-averaged Navier-Stokes (RANS) solver and the Spalart- Allmaras (SA) turbulence model. The lift coe cient of the vehicle for the most part was seen to show a much greater di erence and inconsistencies when compared to drag from the comparisons of solvers, turbulence models, re nement and the e ect of rolling road. Determining the drag of a road vehicle can be easily achieved and veri ed using multiple solvers and methods, however, the lift coe cient and its validation require a greater understanding of the vehicle ow eld as well as the solvers, turbulence models and re nement levels capable of correctly simulating the turbulent regions around a vehicle. Using the presented method, it was found that the optimisation of vehicle aerodynamics can easily be done alongside the design evolution from initial low-drag shapes to the nal detail design, ensuring aerodynamic characteristics are controlled with aesthetic change.
Casoli, Paolo, Fabio Scolari, Carlo Rossi, and Manuel Rigosi. "A cfd design of engineered surface for tribological performance improvements in hydraulic pumps." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71104.
Full textMora, Pérez Miguel. "Computational fluid dynamics (CFD) applied to buildings sustainable design: natural ventilation. Case study." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/86208.
Full textDurante las últimas décadas los agentes involucrados en el diseño de edificios deben de utilizar estrategias fiables de diseño que les permitan aprovechar los recursos naturales del entorno con el objetivo de aumentar la eficiencia energética de los edificios así como promover el desarrollo sostenible y generar valor añadido para la sociedad. Esta tesis propone una estrategia de diseño fiable de edificios para mejorar su eficiencia energética mediante el uso de la ventilación natural (NV por sus siglas en inglés "natural ventilation"). La estrategia consiste en evaluar la solución arquitectónica más adecuada teniendo en cuenta las condiciones ambientales y el entorno de los edificios con el objetivo de maximizar el uso de la ventilación natural desde la fase inicial de su diseño. En esta tesis se aplica la estrategia de diseño a un caso de estudio real y particular. La estrategia de diseño se basa en el uso de un código numérico comercial que resuelve las ecuaciones de la mecánica de fluidos (CFD por sus siglas en inglés "computational fluid dynamics"). El software CFD simula las características que influyen en la ventilación natural y predice su comportamiento en los edificios antes de su construcción. Esta técnica numérica permite la visualización del flujo de aire en los edificios. Además, el software permite calcular parámetros que son analizados y comparados posteriormente para elegir la solución arquitectónica que suponga un mejor comportamiento de la ventilación natural. Con respecto a todas las decisiones arquitectónicas posibles, la investigación se centra en la selección de la ubicación del edificio y de la configuración de los huecos de su fachada. En primer lugar, se analiza la viabilidad de la estrategia de diseño en una región determinada: la zona costera Mediterránea de la Comunidad Valenciana. La región se caracteriza por las condiciones uniformes del viento predominante durante la estación cálida. A continuación, se utiliza una simulación de CFD validada para analizar cualitativamente y cuantitativamente la influencia de los edificios circundantes en los flujos del viento a través y alrededor de los edificios circundantes. El objetivo es comparar distintas posiciones de los huecos de la fachada para seleccionar la alternativa que mejor aproveche los recursos de ventilación natural disponibles. Además, se presenta en el marco de la selección de la configuración de la fachada una cuantificación general de la contribución de la fachada ventilada a la eficiencia energética de los edificios. En segundo lugar, se realizan dos simulaciones para analizar dos ubicaciones diferentes del edificio caso de estudio. La evaluación de la influencia de los edificios circundantes en el comportamiento de la ventilación natural del edificio caso de estudio se realiza mediante la utilización de modelos CFD validados. Se proponen distintos parámetros y visualizaciones para la evaluación cuantitativa y cualitativa de cada solución. A continuación se selecciona la mejor ubicación con respecto al comportamiento de la ventilación natural en el edificio caso de estudio. Finalmente, la investigación concluye con la construcción a escala real del edificio caso de estudio. Se valida con éxito la simulación CFD del interior del edificio utilizada desde la etapa de diseño. También se verifica con éxito el comportamiento de la ventilación natural del edificio. Además, se analizan las condiciones de confort interiores mediante la evaluación de los siguientes índices: riesgo de corrientes de aire (DR por sus siglas en inglés "draught risk"), voto promedio previsto (PMV por sus siglas en inglés "predicted mean vote") y el porcentaje previsto de personas insatisfechas (PPD por sus siglas en inglés "predicted percentage of dissatisfied people"). Los resultados muestran que el uso de la ventilación natural permite alcanzar, de manera más energéticamente eficiente, las
Durant les últimes dècades els agents involucrats en el disseny d'edificis utilitzen estratègies fiables de disseny que els permeten aprofitar els recursos naturals de l'entorn amb l'objectiu d'augmentar l'eficiència energètica dels edificis així com promoure el desenvolupament sostenible i generar valor afegit per la societat. Aquesta tesi proposa una estratègia fiable de disseny d'edificis per a millorar la seva eficiència energètica mitjançant l'ús de la ventilació natural (NV per les sigles en anglès "natural ventilation"). L'estratègia consisteix a avaluar la solució arquitectònica més adequada tenint en compte les condicions ambientals i l'entorn dels edificis amb l'objectiu de maximitzar l'ús de la ventilació natural des de la fase inicial del seu disseny. En aquesta tesi s'aplica l'estratègia de disseny a un cas d'estudi real i particular. L'estratègia de disseny es basa en l'ús d'un codi numèric comercial que resol les equacions de la mecànica de fluids (CFD per les sigles en anglès "computational fluid dynamics"). El programari CFD simula les característiques que influeixen en la ventilació natural i prediu el seu comportament en els edificis abans de la seva construcció. Aquesta tècnica numèrica permet la visualització del flux d'aire en els edificis. A més, el programari permet calcular paràmetres que són analitzats i comparats posteriorment per triar la solució arquitectònica que supose un millor comportament de la ventilació natural. Pel que fa a totes les decisions arquitectòniques possibles, la investigació es centra en la selecció de la ubicació de l'edifici i de la configuració de les obertures de la façana. En primer lloc, s'analitza la viabilitat de l'estratègia de disseny en una regió determinada: la zona costanera Mediterrània de la Comunitat Valenciana. La regió es caracteritza per les condicions uniformes del vent predominant durant l'estació càlida. A continuació, s'utilitza una simulació de CFD validada per analitzar qualitativament i quantitativament la influència dels edificis circumdants en els fluxos del vent a través i al voltant dels edificis circumdants. L'objectiu és comparar diferents posicions dels buits de la façana per seleccionar l'alternativa que millor aprofite els recursos de ventilació natural disponibles. A més, en el marc de la selecció de la configuració de la façana es presenta una quantificació general de la contribució de la façana ventilada a l'eficiència energètica dels edificis. En segon lloc, es realitzen dues simulacions per analitzar dues ubicacions diferents de l'edifici cas d'estudi. L'avaluació de la influència dels edificis circumdants en el comportament de la ventilació natural de l'edifici cas d'estudi es realitza mitjançant la utilització de models CFD validats. Es proposen diferents paràmetres i visualitzacions per a l'avaluació quantitativa i qualitativa de cada solució. A continuació es selecciona la millor ubicació pel que fa al comportament de la ventilació natural a l'edifici cas d'estudi. Finalment, la investigació conclou amb la construcció a escala real de l'edifici cas d'estudi. Es valida amb èxit la simulació CFD de l'interior de l'edifici utilitzada des de l'etapa de disseny. També es verifica amb èxit el comportament de la ventilació natural de l'edifici. A més, s'analitzen les condicions de confort interiors mitjançant l'avaluació dels següents índexs: risc de corrents d'aire (DR per les sigles en anglès "draught risk"), mitjana de vots previstos (PMV per les sigles en anglès "predicted mean vote") i el percentatge previst de persones insatisfetes (PPD per les sigles en anglès "predicted percentage of dissatisfied people"). Els resultats mostren que l'ús de la ventilació natural permet assolir, de manera més energèticament eficient, les condicions de confort.
Mora Pérez, M. (2017). Computational fluid dynamics (CFD) applied to buildings sustainable design: natural ventilation. Case study [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/86208
TESIS
Vollmer, Thees, and Ludger Frerichs. "Development of hydraulic tanks by multi-phase CFD simulation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199968.
Full textBay, Raymond James. "Improved Design Method for Cambered Stepped Hulls with High Deadrise." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90298.
Full textMaster of Science
Eugene Clement developed a new design method to improve the performance of ultra-fast planing crafts. A planing craft uses the force generated from the flow of water over the bottom to lift the vessel without the use of the static buoyancy force that classic boat designs rely on. Clement wanted to improve the performance of the planing vessel by reducing the total drag force caused by the flow of water on the bottom of the vessel. ClementâĂŹs design method involves reducing the wetted surface area which reduces drag. Reducing the wetted surface area would normally cause the lifting force on the vessel to reduce, but with the addition of curvature in the smaller wetted surface area, the lifting force would remain the same. ClementâĂŹs new design method requires multiple iterations to obtain an optimal design. The method limits the angle of the vessels bottom relative to horizontal to under 15 degree. The goal of this thesis is to create a new design method for planing vessels with bottoms that have an incline of 15 degrees or more relative to horizontal. The design method is created using Computational Fluid Dynamics (CFD) solver to model the planing surface moving through water. The CFD solver is validated with experimental test performed at the United States Naval Academy. The improved design method uses equations that can predict the forces and other design characteristics based on the desired vessel weight and seakeeping requirements.
Chadha, Raman. "Design of high efficiency blowers for future aerosol applications." Texas A&M University, 2005. http://hdl.handle.net/1969.1/5002.
Full textDiaconeasa, Mihai Aurelian. "CFD in support of development and optimization of the MIT LEU fuel element design." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95601.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (page 85).
The effect of lateral power distribution of the MITR LEU fuel design was analyzed using Computational Fluid Dynamics. Coupled conduction and convective heat transfer were modeled for uniform and non-uniform lateral power distributions. It was concluded that, due to conduction, the maximum heat flux ratio on the cladding surface is 1.16, compared to the maximum volumetric power generation ratio of 1.23. The maximum cladding temperature occurs roughly 0.5 inches from the edge of the support plate, while the peak volumetric power generation is located at the end of the fuel meat, about 0.1 inches from the edge of the support plate. Although the heat transfer coefficient is lower in the corner of the coolant channel, this has a negligible effect on the peak cladding temperature, i.e. the peak cladding temperature is related to heat flux only and a "channel average" heat transfer coefficient can be adopted. Moreover, coolant temperatures in the radial direction are reasonably uniform, which is indicative of good lateral mixing. Finally, a quasi-DNS study has been performed to analyze the effect of the fuel grooves on the local heat transfer coefficient. The quasi-DNS results bring useful insights, showing two main effects related to the existence of the grooves. First, the increased surface leads to an increase in the pressure drop and further, the flow aligned configuration of the grooves limits the ability of the near wall turbulent structures to create mixing, leading to a noticeable reduction in the local heat transfer coefficient at the base of the grooves. Overall, this leads to an effective decrease in the local heat transfer coefficient, but due to the increased heat transfer surface the global heat transfer is enhanced in comparison to the flat plate configuration. The improved understanding of the effects of grooves on the local heat transfer phenomena provides a useful contribution to future fuel design considerations. For example, the increase in pressure drop, together with the reduction in the local heat transfer coefficient indicated that the selection of a grooved wall channel instead of a smooth wall channel might not necessarily be optimal, particularly if fabrication issues are taken into account, together with the concern that grooved walls may promote oxide growth and crud formation during the life of the fuel.
by Mihai Aurelian Diaconeasa.
S.M.
Tan, Gang 1974. "Study of natural ventilation design by integrating the multi-zone model with CFD simulation." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/28747.
Full textIncludes bibliographical references (p. 150-154).
Natural ventilation is widely applied in sustainable building design because of its energy saving, indoor air qualify and indoor thermal environment improvement. It is important for architects and engineers to accurately predict the performance of natural ventilation, especially in the building design stage. Unfortunately, there is not any good public tool available to predict the natural ventilation design. The integration of the multi-zone model and the computational fluid dynamics (CFD) simulation provides a way to assess the performance of natural ventilation in whole buildings, as well as the detailed thermal environmental information in some particular space. This work has coupled the multi-zone airflow model with the thermal model. A new program, called MultiVent, has been developed with a web-server that can provide online calculation for the public. The MultiVent program can simultaneously simulate the indoor air temperature and airflow rate with known indoor heat sources for buoyancy dominated, buoyancy-wind combined and wind dominated cases. To properly apply the MultiVent program to the natural ventilation design, two configurations in naturally ventilated buildings should be carefully studied: the atrium and large openings between the zones. A criterion has been set up for dividing the large opening and the connected atrium space into at least two sub-openings and sub-zones. The results of the MultiVent calculation can provide boundary conditions to the CFD simulation for some particular zone. In order to correctly simulate the particular space with CFD, the location and conditions at the integrating surface (boundary surface) have been studied. This work suggested that the simulation zone should include part of the connected atrium space when
(cont.) the occupied room is simulated with CFD. There are two options to integrate the MultiVent and CFD simulation through different boundary conditions: velocity (mass) integration and pressure integration. The case studies of this work showed that both of them can generate good CFD simulation results.
by Gang Tan.
Ph.D.
Blanco, Mark Richard. "Design and Qualification of a Boundary-Layer Wind Tunnel for Modern CFD Validation Experiments." Youngstown State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1559237473563483.
Full textNarducci, Robert P. "Selected optimization procedures for CFD-based shape design involving shock waves or computational noise." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-152015/.
Full textChernysheva, Olga V. "Flutter in sectored turbine vanes." Doctoral thesis, KTH, Energy Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3737.
Full textIn order to eliminate or reduce vibration problems inturbomachines without a high increase in the complexity of thevibratory behavior, the adjacent airfoils around the wheel areoften mechanically connected together with lacing wires, tip orpart-span shrouds in a number of identical sectors. Although anaerodynamic stabilizing effect of tying airfoils together ingroups on the whole cascade is indicated by numerical andexperimental studies, for some operating conditions suchsectored vane cascade can still remain unstable.
The goal of the present work is to investigate thepossibilities of a sectored vane cascade to undergoself-excited vibrations or flutter. The presented method forpredicting the aerodynamic response of a sectored vane cascadeis based on the aerodynamic work influence coefficientrepresentation of freestanding blade cascade. The sectored vaneanalysis assumes that the vibration frequency is the same forall blades in the sectored vane, while the vibration amplitudesand mode shapes can be different for each individual blade inthe sector. Additionally, the vibration frequency as well asthe amplitudes and mode shapes are supposed to be known.
The aerodynamic analysis of freestanding blade cascade isperformed with twodimensional inviscid linearized flow model.As far as feasible the study is supported by non-linear flowmodel analysis as well as by performing comparisons againstavailable experimental data in order to minimize theuncertainties of the numerical modeling on the physicalconclusions of the study.
As has been shown for the freestanding low-pressure turbineblade, the blade mode shape gives an important contributioninto the aerodynamic stability of the cascade. During thepreliminary design, it has been recommended to take intoaccount the mode shape as well rather than only reducedfrequency. In the present work further investigation using foursignificantly different turbine geometries makes these findingsmore general, independent from the low-pressure turbine bladegeometry. The investigation also continues towards a sectoredvane cascade. A parametrical analysis summarizing the effect ofthe reduced frequency and real sector mode shape is carried outfor a low-pressure sectored vane cascade for differentvibration amplitude distributions between the airfoils in thesector as well as different numbers of the airfoils in thesector. Critical (towards flutter) reduced frequency maps areprovided for torsion- and bending-dominated sectored vane modeshapes. Utilizing such maps at the early design stages helps toimprove the aerodynamic stability of low-pressure sectoredvanes.
A special emphasis in the present work is put on theimportance for the chosen unsteady inviscid flow model to bewell-posed during numerical calculations. The necessity for thecorrect simulation of the far-field boundary conditions indefining the stability margin of the blade rows isdemonstrated. Existing and new-developed boundary conditionsare described. It is shown that the result of numerical flowcalculations is dependent more on the quality of boundaryconditions, and less on the physical extension of thecomputational domain. Keywords: Turbomachinery, Aerodynamics,Unsteady CFD, Design, Flutter, Low-Pressure Turbine, Blade ModeShape, Critical Reduced Frequency, Sectored Vane Mode Shape,Vibration Amplitude Distribution, Far-field 2D Non-ReflectingBoundary Conditions. omain.
Keywords:Turbomachinery, Aerodynamics, Unsteady CFD,Design, Flutter, Low-Pressure Turbine, Blade Mode Shape,Critical Reduced Frequency, Sectored Vane Mode Shape, VibrationAmplitude Distribution, Far-field 2D Non-Reflecting BoundaryConditions.
Olimstad, Grunde. "Characteristics of reversible-pump turbines." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19750.
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