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Rozprawy doktorskie na temat „Approach flow velocity”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Kim, Goo. "A vorticity-velocity approach for three-dimensional unsteady viscous flow over wings." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/12123.

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Thorburn, John M. "HYDRAULIC EFFECTS OF PERPENDICULAR WATER APPROACH VELOCITY ON METER GATE FLOW MEASUREMENT." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2190.

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Accurate flow measurement is required to effectively manage water resources. California Senate Bill X7-7 (SB X7-7), legislates this need by requiring agricultural water providers serving areas greater than 25,000 acres to develop an Agricultural Water Management Plan (AWMP) and adopt pricing based at least partly on volumetric water deliveries (DWR, 2009). This study focused on two of the most common flow measurement/flow control devices used in California open channel water conveyance systems: the circular meter gate and the rectangular meter gate. Testing was conducted on three Armco-type (r

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Roveda, Roberto. "A combined discrete velocity particle based numerical approach for continuum/rarefied flows /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004370.

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Soldati, Enrico. "Development of a new approach for the assessment of complex blood flow patterns in the left atrium from 4D flow MRI imaging." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Mitral valve regurgitation is a common disorder affecting 2-3% of the general population. The morphological and functional remodelling of the left atrium caused by this disease could favour blood stagnation and consequently stroke risk. Several clinical studies suggest that stroke risk stratification may be improved by using hemodynamic information on the left atrium. The goal of this study was therefore to develop a new approach for the assessment of complex blood flow patterns in the left atrium which could quantify the hemodynamic implications of the mitral valve regurgitation on sick patie

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5

De, Zan Cecilia. "Some new results on reaction-diffusion equations and geometric flows." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422529.

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In this thesis we discuss the asymptotic behavior of the solutions of scaled reaction-diffusion equations in the unbounded domain Rn × (0 + ∞), in the cases when such a behavior is described in terms of moving interfaces. As first class of asymptotic problems we consider the singular limit of bistable reaction-diffusion equations in the case when the velocity of the traveling wave equation depends on the space variable, i.e. cε = cε(x), and it satisfies, in some suitable sense, cε/ετ → α, as ε → 0+, where α is a discontinuous function and τ is an integer that can be equal to 0 or 1. The secon

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Núñez, Uribe Rodolfo Andrés. "Estimation of relative pressure from velocity measurements in blood flows: state-of-the-art and the approaches." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/139466.

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Magíster en Ciencias de la Ingeniería, Mención Matemáticas Aplicadas<br>Ingeniero Civil Matemático<br>El gradiente de presión a lo largo de vasos sanguíneos con estenosis es un índice clínico importante para el diagnóstico de la severidad de patologías cardiovasculares. Mientras el estándar clínico para su medida es una cateterización invasiva (medir directamente la presión introduciendo un catéter en los vasos sanguíneos), la resonancia magnética de contraste de fase ha emergido como una prometedora herramienta para permitir cuantificaciones no invasivas de la presión relativa, ligando las me

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7

Chang, Ze Zhou. "Etude de collisions interparticulaires en écoulement turbulent isotrope ou anisotrope par une approche lagrangienne à plusieurs trajectoires simultanées." Rouen, 1998. http://www.theses.fr/1998ROUES008.

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Une étude des interactions particule/particule est présentée suivant une simulation lagrangienne de plusieurs trajectoires simultanées et la simulation réelle des collisions entre les particules dans un écoulement turbulent donne. Un cas test en turbulence homogène isotrope, sans gravite, a ensuite été étudié et comparé à une simulation directe LES. On montre l'importance de conserver la corrélation V#PU#F globalement constante par une modification de la vitesse des particules fluides lors d'une collision. Cette modification a permis d'observer que pour un nuage distribué aléatoirement dans un

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8

Rigal, Claire. "Comportement de fluides complexes sous écoulement : approche expérimentale par résonance magnétique nucléaire et techniques optiques et simulations numériques." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0091/document.

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Cette thèse est une contribution à la fois expérimentale, théorique et numérique à l'étude des écoulements bidimensionnels de fluides complexes dans une conduite cylindrique présentant des singularités et dans une géométrie annulaire à cylindres excentrés. Le fluide utilisé est une solution de xanthane à différentes concentrations présentant un caractère non newtonien rhéofluidifiant. L'objectif principal de cette thèse est la caractérisation de l'influence des propriétés rhéofluidifiantes sur le comportement des zones de recirculation, en terme de morphologie, de positionnement et d'intensité

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Lassabatere, L., Jaan H. Pu, H. Bonakdari, C. Joannis, and F. Larrarte. "Velocity Distribution in Open Channel Flows: Analytical Approach for the Outer Region." 2012. http://hdl.handle.net/10454/11560.

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No<br>This paper presents an integration procedure for the Reynolds-averaged Navier-Stokes equations for the determination of the distribution of the streamwise velocity using the vertical component. This procedure is dedicated to the outer region and central part of channels. The proposed model is applicable to both rough and smooth flow regimes, provided the velocity at the inner-outer boundary has been properly defined. To generate a simplified expansion, a number of hypotheses are proposed, focusing in particular on the analytical modeling of the vertical component by adopting a neglig

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Barfett, Joseph. "Blood Velocity and Volumetric Flow Rate Calculated from Dynamic 4D CT Angiography using a Time of Flight Approach." Thesis, 2014. http://hdl.handle.net/1807/44003.

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Purpose: A time of flight approach to the analysis of 4D CT angiography is examined to calculate blood flow in arteries. Materials and Methods: Software was written to track contrast bolus TOF along a central vessel axis. Time density curves were analyzed to determine bolus time to peak at successive vessel cross-sections which were plotted against vessel path length. A line of best fit was plotted through the resulting data and 1/slope provided a measurement of velocity. Results: Validation was successful in simulation and in flow phantoms, though quality of results depended strongly on quali

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Pu, Jaan H. "Turbulent Rectangular Compound Open Channel Flow Study Using Multi-Zonal Approach." 2018. http://hdl.handle.net/10454/16744.

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Yes<br>In this paper, an improved Shiono-Knight model (SKM) has been proposed to calculate the rectangular compound open channel flows by considering a Multi-Zonal (MZ) approach in modelling turbulence and secondary flows across lateral flow direction. This is an effort to represent natural flows with compound shape more closely. The proposed model improves the estimation of secondary flow by original SKM model to increase the accuracy of depthaveraged velocity profile solution formed within the transitional region between different sections (i.e. between main-channel and floodplain) of

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12

Pu, Jaan H., M. Pandey, and P. R. Hanmaiahgari. "Analytical modelling of sidewall turbulence effect on streamwise velocity profile using 2D approach: A comparison of rectangular and trapezoidal open channel flows." 2020. http://hdl.handle.net/10454/17964.

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Yes<br>Natural earth-bounded channel flows usually subject to various sidewall turbulences, i.e. in the form of secondary currents, due to non-constant channel shapes at different sections. This paper investigates an improved Shiono-Knight model (SKM) by combining it with a Multi-Zonal (MZ) method (proposed by Pu, 2019) to represent lateral flow turbulence and secondary currents in different shapes of open channel, i.e. rectangular and trapezoidal. By applying the proposed analytical model to both rectangular and trapezoidal channel flows, we have inspected different streamwise velocity charac

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Huang, Yu-Jun. "Ultrasonic measurement for suspended sediment concentrations and flow velocity: An experimental validation of the approach using kaolin suspensions and reservoir sediments." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2101200816333100.

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Huang, Yu-Jun, and 黃裕君. "Ultrasonic measurement for suspended sediment concentrations and flow velocity: An experimental validation of the approach using kaolin suspensions and reservoir sediments." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85979829404400644344.

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博士<br>臺灣大學<br>工程科學及海洋工程學研究所<br>96<br>Multiphase suspension systems are extensively used in hydrology, biochemistry, and the food industry. Ultrasonic spectroscopy is a rapid, on-line, non-invasive measurement technique for suspension characterization of different particle sizes and wide-ranging concentrations. This study presents the design and fabrication of a novel experimental system to simultaneously measure the sediment concentration and flow velocity of ultrasound wave propagation in liquid at different temperatures. Experimental validation in a laboratory environment provides a series o

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15

Moruzzi, R. B., John Bridgeman, and P. A. G. Silva. "A combined experimental and numerical approach to the assessment of floc settling velocity using fractal geometry." 2020. http://hdl.handle.net/10454/17920.

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Yes<br>Sedimentation processes are fundamental to solids/liquid separation in water and wastewater treatment, and therefore a robust understanding of the settlement characteristics of mass fractal aggregates (flocs) formed in the flocculation stage is fundamental to optimized settlement tank design and operation. However, the use of settling as a technique to determine aggregates’ traits is limited by current understanding of permeability. In this paper, we combine experimental and numerical approaches to assess settling velocities of fractal aggregates. Using a non-intrusive in situ dig

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Rossi, Stefano, and Piero Tortoli. "Development and validation of novel approaches for real-time ultrasound vector velocity measurements." Doctoral thesis, 2021. http://hdl.handle.net/2158/1239650.

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Ultrasound imaging techniques have become increasingly successful in the medical field as they provide relatively low cost and totally safe diagnosis. Doppler methods focus on blood flow for the diagnosis and follow-up of cardiovascular diseases. First Doppler methods only measured the axial component of the motion. More recently, advanced methods have solved this problem, by estimating two or even all three velocity components. In this context, high frame rate (HFR) imaging techniques, based on the transmission of plane waves (PW), lead to the reconstruction of 2-D and 3-D vector maps of bloo

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