Дисертації з теми "Menter Shear stress transport"
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Waliszewski, Matthias Werner. "Relationship between in vitro shear stress exposure and transendothelial transport /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487864986610768.
Повний текст джерелаMineault-Guitard, Alexandre. "Validation of Observed Bedload Transport Pathways Using Morphodynamic Modelling." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34587.
Повний текст джерелаHong, Dihui Barbee Kenneth A. Jaron Dov. "Role of transport dependent calcium signaling in nitric oxide production and endothelial shear stress responses /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1790.
Повний текст джерелаWang, Yung-Chieh (Becky). "Effects of physical properties and rheological characteristics on critical shear stress of fine sediments." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51723.
Повний текст джерелаSime, Louise C. "Reach-scale spatial variation of grain-size, shear stress, and bedload transport in gravel-bed rivers." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401128.
Повний текст джерелаValentine, Kendall. "Characterization of the bed, critical boundary shear stress, roughness, and bedload transport in the Connecticut River Estuary." Thesis, Boston College, 2015. http://hdl.handle.net/2345/bc-ir:104550.
Повний текст джерелаThis study characterizes the bed of the Connecticut River estuary in terms of grain size and bedforms, and relates these to river discharge, tidal currents, and sediment transport. Over four field excursions, sediment cores were collected, in addition to bathymetry surveys, and water column measurements. A three-dimensional circulation and sediment transport model calculated boundary shear stress over the same time. The bed of the estuary is composed mostly of sand, with small amounts of fine sediments. Deposition of fine sediments is limited by the landward extent of the salt intrusion. Large bedforms are oriented seaward. The critical shear stress for the median grain size is exceeded each tidal cycle. Bedload transport is dominantly seaward during high discharge conditions, but varies during low discharge. Bathymetry surveys from previous studies and this study show consistent bedform fields over 25 years. Bedforms observed in the field reflect typical conditions rather than extreme events
Thesis (MS) — Boston College, 2015
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences
Koyama, Tomofumi. "Stress, Flow and Particle Transport in Rock Fractures." Doctoral thesis, Stockholm : Mark- och vattenteknik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4485.
Повний текст джерелаKoyama, Tomofumi. "Numerical modelling of fluid flow and particle transport in rough rock fracture during shear." Licentiate thesis, Stockholm : Mark och vatten, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-512.
Повний текст джерелаPerret, Emeline. "Transport of moderately sorted gravels at low bed shear stress : impact of bed arrangement and fine sediment infiltration." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1223/document.
Повний текст джерелаThis PhD thesis aims to understand gravel dynamics in Alpine rivers at low bed shear stress using laboratory experiments. Alpine river beds are often poorly sorted and composed of sediments ranging from clay to pebble. To understand interactions between these classes is an issue for predicting bedload rate. Laboratory experiments were performed in a 18m long and 1m wide flume, under unsteady flows. Two types of bed were investigated: unimodal and bimodal beds. A particular attention was paid to the bed construction, which was conducted in order to obtain a nature-like bed 12with different bed arrangements and degrees of clogging. Unimodal beds were made of moderately sorted gravels with different bed surface arrangements. Bimodal beds were made of moderately sorted gravels in which fine sediments (sand or silt) were infiltrated. Gravel rate was found to be impacted by the bed arrangement degree, the fine sediment concentration within the bedload layer and the changes in bed properties due to fine sediment presence (bed cohesion, bed permeability). The more packed the bed is; the more difficult it is to move gravels. The more concentrated in fine sediment the bedload layer is; the easier the transport of gravels is. The shape of fine sediments can also be an important factor for modifying the gravel rate. The presence of cohesive fine sediments within the bed matrix reduces significantly the gravel rate. A conceptual model was developed to recap the different processes controlling gravel transport. It provides a phenomenological description of the overall bed responses to a hydrograph. This tool is designed to help understanding, estimating or interpreting gravel transport in Alpine rivers. The conceptual model was discussed and applied to a field case made on the Arc River. Using the model, we also suggest a new dimensionless analysis for the construction of a bedload predicting model involving parameters describing bed arrangement, bed properties and fine sediment presence
Mohammadi, Mirali. "Resistance to flow and the influence of boundary shear stress on sediment transport in smooth rigid boundary channels." Thesis, University of Birmingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551283.
Повний текст джерелаРезвая, Ксения Сергеевна, Виктор Эдуардович Дранковский та А. В. Дорошенко. "Выбор модели турбулентности при расчете потерь энергии в элементах проточной части гидромашины с использованием программного комплекса CFD". Thesis, НТУ "ХПИ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38339.
Повний текст джерелаChan, Tuck Leong. "A study of sediment transport in two-stage meandering channel." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/14029.
Повний текст джерелаFovet, Ophélie. "Gestion des développements d'algues benthiques dans les canaux de transport d'eau : modèles pour des stratégies de régulation hydrauliques." Thesis, Montpellier, SupAgro, 2010. http://www.theses.fr/2010NSAM0031.
Повний текст джерелаAlgae developments in open-channel networks induce strong constraints for the network management. The physical and chemical nuisances linked to these developments require alternative management strategies. The thesis proposes an original method for these algae management based on the hydraulic control of the system using flushing-flows. These flushes consist in detaching a part of the fixed algae by increasing the hydraulic shear stress exerted on the biomass fixed on the substratum. The re-suspension of algae in the water column induces a turbidity peak which also has to be controlled. The proposed approach aims at characterizing and modelling the processes of algae development, detachment and transport during the flushes. Experimental monitoring of the growth phase is conducted in experimental flumes. The biomass samples are used to calibrate a model of algal growth which integrates the hydrodynamic effect and the algae sensitivity in the Med iterranean region. A model of the fixed and drift algae dynamics in response to a flush is then developed and calibrated on the observerd turbidity plumes. Finally, a control framework based on a linear model is proposed for the turbidity control during a flush. An open-loop control is first developed, then an adaptative feedback controller is tested to estimate unknown parameters such as initial biomass
Ghoma, Mohamed I. "The Effect of Wall Jet Flow on Local Scour Hole." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5501.
Повний текст джерелаGhoma, Mohamed Ibrahem. "The effect of wall jet flow on local scour hole." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5501.
Повний текст джерелаDavey, Chad E. "Longitudinal trends in grain size, shear stress and sediment mobility along sedimentary links of a Canadian Shield river, Saguenay Region : a geomorphic perspective on assessing Atlantic salmon (Salmo salar) productivity in rivers." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82215.
Повний текст джерелаSpecifically, this study examines link-scale trends in surface grain size and channel slope. This study also uses the sedimentary link concept within an ecological context to explain the spatial organization and quality of Atlantic salmon spawning and rearing habitat. (Abstract shortened by UMI.)
Ismail, Zulhilmi. "A study of overbank flows in non-vegetated and vegetated floodplains in compound meandering channels." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/7905.
Повний текст джерелаLoyau, Hugues. "Etude numérique et modélisation algébrique des phénomènes d'anisotropie en turbulence statistique." Rouen, 1996. http://www.theses.fr/1996ROUES067.
Повний текст джерелаToniati, André Luis. "Escoamentos pulsantes com superfície livre : caracterização e sua ação em fundo de canais /." Ilha Solteira, 2018. http://hdl.handle.net/11449/155857.
Повний текст джерелаResumo: No contexto de Desastres "Naturais", as corridas de lama têm sido objeto de estudo devido ao seu poder erosivo e, muitas vezes, destrutivo, acarretando perdas materiais vultosas e ceifando vidas. Nestes escoamentos, quando em condições favoráveis de vazão, inclinação e reologia do fluido, podem surgir instabilidades que se propagam em forma de trem de ondas na superfície, denominadas roll waves. A literatura acerca do assunto trata, geralmente, dos critérios de geração, estabilidade, e determinação das características principais do fenômeno, como amplitude, comprimento e celeridade de onda. Nesta dissertação buscou-se estudar a tensão de cisalhamento no fundo na presença de roll waves, em duas vertentes: a primeira apresenta as roll waves em água limpa, baseando-se no trabalho clássico de Dressler (1949); a segunda, dando continuidade aos trabalhos do Grupo de Pesquisa de Reologia de Materiais Viscosos e Viscoplástcos (Grupo RMVP), focou no estudo de roll waves desenvolvendo-se em fluidos do tipo Herschel-Bulkley, em duas situações - canal de fundo impermeável e fundo com condição de permeabilidade, grande contribuição desta dissertação. Os modelos matemáticos foram desenvolvidos com base nas equações de águas rasas, cuja implementação numérica permitiu confrontar resultados experimentais e numéricos, que apresentaram boa aderência. Para o modelo com condição de permeabilidade no fundo, verificou-se a influência do fator de porosidade nas características das roll waves (ampli... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Mudflows have been the focus of studies because of their erosive ability and often destructive power, causing material losses and taking away lives. Under favorable conditions of discharge, slope, disturbance, and rheology, these flows can develop a specific type of instability that is propagated downstream as shock waves, called roll waves. Most of the roll waves literature provides information on generation criteria, stability, and information of amplitudes, wavelengths, and celerity. This works brings a study of bottom shear stress in pulsating flows (roll waves) in 2 parts. In the first part, we present roll waves in clean water, based on Dressler’s work. In the second part, we continue the works of research team about roll waves developing in Herschel-Bulkley fluid under 2 conditions: impermeable bottom and porous bed. The mathematical models developed were based on shallow water equations. The results of these models were compared to Fluent and experimental results, showing a good agreement. For the mathematical model with porous bed condition, we evaluated the effect of porosity factor in properties of roll waves, and we observed that the amplitude of the roll wave usually increases, whereas the length and the celerity decrease with the presence of this factor. Finally, considering an impermeable bottom, the bottom shear stress presented an increase of 12% to 27%, depending on nature (laminar-turbulent) and dynamics (Froude number) of flow. Taking in account a porous b... (Complete abstract click electronic access below)
Mestre
Chassagneux, François-Xavier. "Etude expérimentale des processus hydro-sédimentaires sous le déferlement de vagues irrégulières." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENI011.
Повний текст джерелаThis thesis presents a wave channel simulation of the hydrodynamic and sediment transportprocesses in the wave breaking region. The spatio-temporal analysis of the mean and instantaneousflow structure relies on a full set of high resolution data. The study focuses on processes related tothe wave boundary layer and to the impact of surface breaking on the mobile bed.A terraced beach profile is generated by the breaking of irregular wave sequences (JONSWAP) on amobile bed constituted of low density sediments (_ _ 1.19). In these conditions, the acoustic measurementof velocity profiles, concentration profiles and sediment flux profiles are synchronised withsequences of video images and wave heights. An analysis of the evolution of mean hydrodynamicand sediment transport quantities is undertaken across the entire wave breaking zone. An intra-waveanalysis on the flow structure below irregular breaking waves is carried out. Finally, bed shear stressbelow a breaking wave predicted by different physical models and direct measurements, are comparedand discussed
Navarro, Hernan Ricardo. "Flume Measurements of Erosion Characterstics of Soil at Bridge Foundations in Georgia." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7267.
Повний текст джерелаJanbakhsh, Setareh. "A Ventilation Strategy Based on Confluent Jets : An Experimental and Numerical Study." Doctoral thesis, Linköpings universitet, Energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-117442.
Повний текст джерелаAndersson, Harald. "Numerical and experimental study of confluent jets supply device with variable airflow." Licentiate thesis, Högskolan i Gävle, Energisystem och byggnadsteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29271.
Повний текст джерелаUnder senare tid har applikation av Confluent jets för design av tilluftsdon studerats. Många studier har även utförts över potentialen av att applicera variabelt luftflöde (VAV) för att minska energianvändningen i ventilationssystem. Denna studie undersöker möjligheten att kombinera Confluent jets-don med VAV, både med avseende på den lokala flödesbilden och dess påverkan på termisk komfort, luftkvalitet och energieffektivitet i en klassrumsmiljö där luftflödes varieras. Denna studie baseras dels på en experimentell fältstudie där tilluftsdon baserade på Confluents jets jämfördes med befintliga deplacerande tilluftsdon. Fältstudien utvärderade energieffektiviteten, den termiska komforten och luftkvaliteten för båda typerna av tillluftsdon. Confluent jets-donen testades under varierat luftflöde för att se påverkan av flödesvariationen på ventilationens prestation under de olika flödena. Utöver fältstudien testades Confluent jets-donen experimentellt och numeriskt i ett välisolerat test-rum för få den detaljerade flödeskarakteristiken för den här typen tilluftsdon vid varierat luftflöde. Resultaten från fältstudien visar på en jämn fördelning av den lokala luftsmedelåldern i vistelsezonen, även för fallen med relativt låga luftflöden. Luftflöden har ingen signifikant effekt på omblandningen. Den termiska komforten i klassrummet ökade när luftflödet anpassades efter värmelasten jämfört med de deplacerande donen. Slutsatsen från fältstudien är att kombinationen av VAV och Confluent jets-don kan användas för att minska energianvändningen på skolan och bevara luftkvaliteten och den termiska komforten i vistelsezonen. Resultaten från den experimental och numeriska studien visar luftflödet och lufthastigheten i varje enskild dysa är direkt beroende på det totala luftflödet genom donet. Dock är flödesfördelningen mellan dysorna oberoende av de tre olika luftflödena. Den numeriska undersökningen visar att flödesprofilen för varje dysa är konstant trots att flödet varieras, men amplituden för varje profil ökar med en höjning av luftflödet. Det betyder att tilluftsdon av den här typen kan användas med VAV för att producera Confluent jets för olika luftflöden. Resultaten från båda studierna visar att luftflöde inte påverkar fördelningen av luften vare sig längs luftdonen eller på rumsnivå. Fördelningen av luften är nästan helt jämn längs donen och på rumsnivå är omblandningen och luftkvalitet den samma för varje luftflöde. Det betyder att det finns potential för att kombinera det här två teknikerna för att designa luftdistribueringssystem med hög energieffektivitet och hög termisk komfort med god luftkvalitet.
Cantrell, William. "Method of Evaluation for Stream Bed Shear Stress and Sediment Transport Capacity in Urbanizing Watershed: Implications for Stream Restoration." 2009. http://trace.tennessee.edu/utk_gradthes/27.
Повний текст джерелаCantrell, William R. "Method of evaluation for stream bed shear stress and sediment transport capacity in urbanizing watershed implications for stream restoration /." 2009. http://trace.tennessee.edu/utk_gradthes/27.
Повний текст джерелаTait, Simon J., J. Heald, I. K. McEwan, M. Soressen, G. Cunningham, B. Willetts, and D. Goring. "Probabilistic modelling of bed-load composition." 2009. http://hdl.handle.net/10454/2850.
Повний текст джерелаThis paper proposes that the changes which occur in composition of the bed load during the transport of mixed-grain-size sediments are largely controlled by the distributions of critical entrainment shear stress for the various size fractions. This hypothesis is examined for a unimodal sediment mixture by calculating these distributions with a discrete particle model and using them in a probabilistic calculation of bed-load composition. The estimates of bed-load composition compare favorably with observations of fractional transport rates made in a laboratory flume for the same sediment, suggesting that the hypothesis is reasonable. The analysis provides additional insight, in terms of grain mechanics, into the processes that determine bed-load composition. These insights strongly suggest that better prediction methods will result from taking account of the variation of threshold within size fractions, something that most previous studies have neglected.
Allamaprabhu, Yaravintelimath. "Turbulence Modeling for Predicting Flow Separation in Rocket Nozzles." Thesis, 2014. http://hdl.handle.net/2005/3046.
Повний текст джерелаPéloquin-Guay, Mathilde. "Évaluation de l’effet des vagues de bateau sur les conditions hydrauliques près des berges en milieu fluvial." Thèse, 2013. http://hdl.handle.net/1866/10680.
Повний текст джерелаBoat induced waves generate additional stress on banks and should be included in bank erosion predictive models. The objective of this study is to investigate the role of boat generated waves on near bank flow in a fluvial environment. We used a longitudinal array of four bi-directional eletromagnetic current meters (ECMs) perpendicular to the bank and two optical backcattering sensors (OBSs) set back to back, one facing the river bank (inner looking) and the other towards the river (outer looking) to measure mean and turbulent properties of the horizontal and vertical flow velocities and suspended sediment fluxes generated by the waves. The waves were generated using a 16 ft long boat equipped with a 40hp motor. The effect of three different distances between the bank and sailing line (5, 10, 15 m) and of three different speeds of the vessel (5, 15 and 25 km/h) was evaluated. Five replicates of each combination of distance and speed were realized for a total of 45 passages. Variability of flows conditions, wave characteristics and turbidity properties were characterized and spectral analyses were performed to separate oscillatory and turbulent flow induced by boat generated waves. An important variability in suspended sediment response to the passages of boat wave is observed between replications and the effect of speed and distance of sailing line is nonlinear. It was often unbalanced between the inner and outer looking OBS suggesting that the bank changed its morphology. Cross-correlation between hydraulic and turbidity variables show the significance of the relation between shear stress and suspended sediment transport variables. This study provides quantitative relations between wave dynamics and plumes of suspended sediment that could help to develop mitigation measures in fluvial environments where vessel traffic represents a major issue for bank erosion and retreat.