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Дисертації з теми "Channel Flow with Wall Transpiration"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

O'Dea, Enda. "Robust control of non-linear 2D and linear 3D disturbances in channel flow by surface transpiration." Thesis, University of Southampton, 2004. https://eprints.soton.ac.uk/47092/.

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The attenuation of perturbations in both periodic and non-periodic channel flow is attempted through wall-normal transcription and point wall-shear-stress measurements. The transcription is applied in both continuous harmonic form and a system based on discrete zero-net-mass-flux panel-pair form. For 2D flow it is demonstrated by means of a spectral Galerkin solver, that a simple classical controller with harmonic transpiration is capable of attenuating highly non-linear 2D perturbations. A multiple-input/multiple-output (MIMO) robust control scheme designed for the attenuation of perturbation

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2

Estejab, Bahareh. "AN INVESTIGATION OF THE REYNOLDS NUMBER DEPENDENCE OF THE NEAR-WALL PEAK IN CANONICAL WALL BOUNDED TURBULENT CHANNEL FLOW." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_theses/144.

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An experimental investigation into fully developed high aspect ratio channels was undertaken. A review of the literature reveals that there is a need for accurate measurement of the inner peak value of streamwise turbulence intensity despite the large number of studies already completed. The scattered data on this subject could be attributed either to insufficient channel size (aspect ratio or length) or to hot-wire spatial filtering. A new, high quality, channel flow facility was designed and constructed, considering the most recent geometric limitation provided in the literature. To obtain a

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3

Polanco, Juan Ignacio. "Lagrangian properties of turbulent channel flow : a numerical study." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1043/document.

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La perspective lagrangienne, décrivant un écoulement selon les trajectoires de traceurs fluides, est une approche naturelle pour étudier les phénomènes de dispersion dans les écoulements turbulents. En turbulence de paroi, le mouvement des traceurs est influencé par le cisaillement moyen et par une forte inhomogénéité et anisotropie en proche paroi. On étudie les propriétés lagrangiennes d’un écoulement de canal turbulent par simulation numérique directe à un nombre de Reynolds modéré. Les statistiques d’accélération lagrangienne sont comparées aux expériences de suivi de particules réalisées

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4

Tilton, Nils Guillaume. "The effects of wall permeability on the linear stability of channel flow and the asymptotic suction boundary layer." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86673.

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We investigate the effects of wall permeability on the linear stability of two classical wall-bounded shear flows. In the first part of this thesis, we consider pressure driven, incompressible, fully developed, laminar flow in a channel delimited by rigid, homogeneous, isotropic, porous layers. We consider porous materials of small permeability in which the flow velocity is small and for which the inertial effects can be neglected. We solve the fully coupled, temporal, linear stability problem arising from the adjacent flows in the channel and porous regions. We perform a parametric study in w

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5

Wang, Fei. "Gas-Solid Fluidization: ECVT Imaging and Mini-/Micro-Channel Flow." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1290390285.

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6

Alex, Alvisi, and Perez Adalberto. "Analysis of wall-mounted hot-wire probes." Thesis, KTH, Strömningsmekanik och Teknisk Akustik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289564.

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Flush-mounted cavity hot-wire probes have been around since two decades, but have typically not been applied as often compared to the traditional wall hot-wires mounted several wire diameters above the surface. While the latter suffer from heat conduction from the hot wire to the substrate in particular when used in air flows, the former is belived to significantly enhance the frequency response of the sensor. The recent work using a cavity hotwire by Gubian et al. (2019) came to the surprising conclusion that the magnitute of the fluctuating wall-shear stress τ+w,rms reaches an asymptotic val

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7

Choi, Hang Seok. "A Numerical Study on the Turbulent Flow and Heat Transfer in a Channel with a Wavy Undulated Bottom Wall." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147618.

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8

Claretti, Roberto. "Heat and fluid flow characterization of a single-hole-per-row impingement channel at multiple impingement heights." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5920.

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The present work studies the relationship between target and sidewall surfaces of a multi-row, narrow impingement channel at various jet heights with one impingement hole per row. Temperature sensitive paint and constant flux heaters are used to gather heat transfer data on the target and side walls. Jet-to-target distance is set to 1, 2, 3, 5, 7 and 9 jet diameters. The channel width is 4 jet diameters and the jet stream wise spacing is 5 jet diameters. All cases were run at Reynolds numbers ranging from 5,000 to 30,000. Pressure data is also gathered and used to calculate the channel mass fl

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9

Helvey, Jacob. "Experimental Investigation of Wall Shear Stress Modifications due to Turbulent Flow over an Ablative Thermal Protection System Analog Surface." UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/57.

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Modifications were made to the turbulent channel flow facility to allow for fully developed rough quasi-2D Poiseuille flow with flow injection through one surface and flow suction through the opposing surface. The combination of roughness and flow injection is designed to be analogous to the flow field over a thermal protection system which produces ablative pyrolysis gases during ablation. It was found that the additional momentum through the surface acted to reduce skin friction to a point below smooth-wall behavior. This effect was less significant with increasing Reynolds number. It was al

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10

Jana, Chandrima. "Numerical Study of Three-Dimensional Flow Through a Deep Open Channel - Including a Wire-Mesh Segment on One Side Wall." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321967296.

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11

Perkins, Richard Mark. "PIV Measurements of Turbulent Flow in a Rectangular Channel over Superhydrophobic Surfaces with Riblets." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5547.

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In this thesis I investigate characteristics of turbulent flow in a channel where one of the walls has riblets, superhydrophobic microribs, or a hybrid surface with traditional riblets built on a superhydrophobic microrib surface. PIV measurements are used to find the velocity profile, the turbulent statistics, and shear stress profile in the rectangular channel with one wall having a structured test surface. Both riblets and superhydrophobic surfaces can each provide a reduction in the wall shear stress in a turbulent channel flow. Characterizing the features of the flow using particle image

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12

Sebastian, Robin. "Numerical simulation of acoustic propagation in a turbulent channel flow with an acoustic liner." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2297/document.

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Les matériaux absorbants acoustiques, qui sont d’un intérêt stratégique en aéronautique pour la diminution passive du bruit des réacteurs d’avion, conduisent à une physique complexe où l’écoulement turbulent, des ondes acoustiques, et l’absorbant interagissent. Cette thèse porte sur la simulation de cette interaction dans le problème modèle d’un écoulement de canal turbulent avec des parois impédantes, par le biais de simulations numériques aux grandes échelles implicites, dans un contexte de calcul haute performance.Une étude est d’abord faite des grandes échelles dans un canal turbulent avec

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13

Sebastian, Robin. "Numerical simulation of acoustic propagation in a turbulent channel flow with an acoustic liner." Electronic Thesis or Diss., Poitiers, 2018. http://www.theses.fr/2018POIT2297.

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Les matériaux absorbants acoustiques, qui sont d’un intérêt stratégique en aéronautique pour la diminution passive du bruit des réacteurs d’avion, conduisent à une physique complexe où l’écoulement turbulent, des ondes acoustiques, et l’absorbant interagissent. Cette thèse porte sur la simulation de cette interaction dans le problème modèle d’un écoulement de canal turbulent avec des parois impédantes, par le biais de simulations numériques aux grandes échelles implicites, dans un contexte de calcul haute performance.Une étude est d’abord faite des grandes échelles dans un canal turbulent avec

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14

Krishnamurthy, Nagendra. "Investigation of Fouling in Wavy-Fin Exhaust Gas Recirculators." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32012.

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This dissertation presents a detailed account of the study undertaken on the subject of fouling of Exhaust Gas Recirculator (EGR) coolers. The fouling process in EGR coolers is identified to be due to two primary reasons â deposition of fine soot particles and condensation of hydrocarbons known as dry soot and wet soot fouling, respectively. Several numerical simulations are performed to study the fouling process. Preliminary analysis of the particle forces for representative conditions reveal that drag, thermophoresis and Brownian forces are the significant transport mechanisms and among th

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15

Alrahmani, Mosab. "A numerical study on the effects of surface and geometry design on water behaviour in PEM fuel cell gas channels." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16245.

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Water management is a serious issue that affects the performance and durability of PEM fuel cells. It is known, from previous experimental investigations, that surface wettability has influence on water behaviour and fuel cell performance. This finding has lead researchers to develop numerical tools for further investigation of the liquid water behaviour in gas channels. The Volume-of-Fluid (VOF) method has been used in a wide range of studies for its advantage of showing the multi-phase interface in a Computational Fluid Dynamics (CFD) simulation to understand liquid water behaviour in gas ch

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16

Mláděnka, Jakub. "Návrh přírodě blízkých opatření na vodním toku Bobrava." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391926.

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The aim of the diploma thesis is to describe and evaluate in detail the current state of the Bobrava river in the interest section – river kilometer 1,832-5,743. Part of the work is to assess the capacity of the river flow and the objects connected with it and find the class of an actual safety at village Zelesice. The calculation of the flow rate is performed by using the 1D mathematical model HEC-RAS for selected N-year flows. On the basis of the results of the flow rate, it is made the idea of natural freindly flood protection before the value of the 20-year flow. The result is two variants

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17

Bellec, Morgane. "Études du couplage entre turbulence et gradient de température pour l'intensification des transferts de chaleur dans les récepteurs solaires à haute température." Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0005/document.

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Une voie prometteuse pour améliorer le rendement des centrales solaires à tour consiste à chauffer de l'air pressurisé à haute température afin d'alimenter un cycle thermodynamique de Brayton. Pour cela, il est indispensable de concevoir des récepteurs solaires performants,permettant de forts transferts de chaleur vers le fluide. Le développement de tels récepteurs passe par une compréhension fine de leurs écoulements internes. Il s'agit d'écoulements complexes, combinant de hauts niveaux de turbulence et un fort gradient de température entre la paroi irradiée par le flux solaire concentré et

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18

Ulerich, Rhys David. "Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles." Thesis, 2014. http://hdl.handle.net/2152/26886.

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Turbulent boundary layers approximating those found on the NASA Orion Multi-Purpose Crew Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station have been studied by direct numerical simulation, with the ultimate goal of reducing aerothermodynamic heating prediction uncertainty. Simulations were performed using a new, well-verified, openly available Fourier/B-spline pseudospectral code called Suzerain equipped with a ``slow growth'' spatiotemporal homogenization approximation recently developed by Topalian et al. A first study aimed to reduce tu

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19

Jeng, Shih-Shiang, and 鄭世湘. "Effects of Particle-Wall Interaction in a Particle-Laden Turbulent Channel Flow." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/65338821497285210919.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>91<br>Particle-laden turbulent channel flow, loaded with glass and copper particles, respectively, at a mass flow ratio of 0.2, is studied numerically by the large eddy simulation (LES) coupled with Lagrangian particle tracking (LPT) method. The Smagorinsky model is employed to account for the contribution of subgrid scales. The particle motion is calculated using the four-way coupling approach. The effects of wall roughness on particle motion and turbulence modulation are investigated by incorporating two wall roughness models into the simulation. One is the vi

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20

Guo, Da-Ching, and 郭大慶. "Numerical analysis of the flow in a channel with a peristaltic wall." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/89498862412971238617.

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碩士<br>國立交通大學<br>機械工程學系<br>99<br>A 2-D channel flow with a peristaltic wall was solved by using unstructured moving grid and Finite Volume method. We calculate the flow when there are several peristaltic waves on the upper wall with different wave number and amplitude ratio under different back pressure and Reynolds number. And by the comparisons of numerical results and the experiments and theory, we found the differences between the numerical results and experiments are very small. In addition, we observed that the average flow rate is increased when we increase the amplitude ratio or wave nu

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21

Huang, Ying-Jui, and 黃盈瑞. "Entropy Generation Analysis of Channel Flow with Wall-Attached and -Detached Heated Blocks." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/84701799813096544226.

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碩士<br>國立成功大學<br>機械工程學系<br>89<br>Abstract This study main employ “Second Law of Thermodynamics (Entropy generation)“viewpoint and Local (Average) Nusselt number to analysis the effects of incompressible laminar channel flow fluid, wall heat transfer characteristics and friction coefficient with Wall-Attached and Wall-Detached Heated Blocks and staggered or in-line blocks. The governing equations are solved by a Finite-volume-based Finite-Element method .In this study, no-stagger grid or collocation are used to solve the Navier-Stokes equations. The parameters in

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22

Zhou, Dongmei Ball K. S. Bogard David G. "A direct numerical simulation of fully developed turbulent channel flow with spanwise wall oscillation." 2005. http://repositories.lib.utexas.edu/bitstream/handle/2152/2222/zhoud94913.pdf.

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23

Zhou, Dongmei. "A direct numerical simulation of fully developed turbulent channel flow with spanwise wall oscillation." Thesis, 2005. http://hdl.handle.net/2152/2222.

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24

Lu, Ching-Lin, and 呂景琳. "Simulation of the Molecular Gas Dynamics With Adiabatic Wall Boundary Condition in Micro-Channel Flow." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/05197285632617730307.

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碩士<br>國防大學中正理工學院<br>兵器系統工程研究所<br>96<br>In this study, the Direct Simulation Monte Carlo (DSMC) method is adopted to implement the simulation of the micro-channel flow with adiabatic walls. The major concern is to set up the proper boundary conditions for adiabatic channel walls. A novel gas-wall molecule collision rule for describing the adiabatic wall in DSMC simulation is proposed. This novel gas-wall collision rule keeps the molecule total velocity invariant and its normal velocity component reversed with the same magnitude before and after collision, while the other two components can vary

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25

Chang, Yu Hsiung, and 張幼軒. "Existence and Bifurcation of Similariy Solutions for Laminar Flow in a Channel with One Porous Wall." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/25092357686155772044.

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26

Liu, Keng-Hao, and 劉耿豪. "Transient Convection in Micropolar Fluid Flow Through a Wavy Wall Channel Including the Magnetic Field Effect." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/42790866147250540757.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>90<br>Forced and mixed convection of micropolar fluids through a periodic array of wavy-wall channel has been analyzed by a simple coordinate transformation method and the spline alternating-direction implicit method. The governing equations of system are derived from complete Navier-Stokes equations with theories of micropolar fluid, we can expand the applications from in Newtonian fluids to in non-Newtonian fluids. The transformed governing equations can expand the irregular boundary into a calculable regular plane, and then solve it by using the spline alternat

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27

Willie, Robert H. "Fully developed laminar natural convection in a vertical parallel plate channel with symmetric uniform wall temperature." Thesis, 1996. http://hdl.handle.net/1957/34268.

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Described in this thesis is an investigation of the fully developed natural convection heat transfer in a vertical channel formed by two infinitely wide parallel plates maintained at a uniform wall temperature. Closed-form solutions for the velocity and temperature profiles are developed along with local and averaged Nusselt numbers. The local Nusselt number based on bulk temperature is found to be 3.77. This result is an analog corresponding to 7.60 for fully developed laminar forced convection in a parallel plate channel with uniform wall temperature boundary condition. The local Nusselt num

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28

Mehdizadeh, Amirfarhang. "Direct Numerical Simulation, Lie Group Analysis and Modeling of a Turbulent Channel Flow with Wall-normal Rotation." Phd thesis, 2010. https://tuprints.ulb.tu-darmstadt.de/2092/2/MehdizadehDissertation.pdf.

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In this thesis laminar and turbulent channel flows with wall-normal rotation have been investigated by means of numerical and analytical approaches. Contrary to the streamwise and the spanwise rotating channel flow, channel flows with wall-normal rotation has been rarely studied. Since there is no possible experimental approach to the investigation of this flow, they can be studied only numerically and analytically. However, an analytical approach is only possible in the laminar case. In order to establish the effects of the wall-normal rotation on the turbulent channel flow and also to provid

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29

Ghoma, Mohamed Ibrahem, Khalid Hussain, and Simon J. Tait. "The experimental and numerical approach of two-phase flows by wall jets on rough beds in open channel flow." 2014. http://hdl.handle.net/10454/10642.

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Yes<br>This paper presents the results of investigations carried out to study the effect of horizontal wall jets on a fixed rough bed in an open channel. The study used both numerical and experimental approaches. The numerical and experimental studies are compared for validation. The main objective of this study is to understand the effect of wall jets on a horizontal fixed rough bed in an open channel. The experimental study investigated the effect of wall jets on a fixed horizontal bed, with a known roughness in an open channel flume. A sid-looking Acoustic Doppler Velocimetry (ADV

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30

Anika, Nisat Nowroz. "Can turbulence be maintained in a low Re channel flow?: A CFD analysis." Thesis, 2018. http://hdl.handle.net/1959.13/1390972.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Mixing is difficult to achieve in low Reynolds number channel or pipe flows. It can be achieved by generating turbulent motion, which is also important in the context of increasing momentum transport as well as heat and mass transfer phenomenon. A direct numerical simulation based on lattice Boltzmann method (LBM) was carried out in a laminar channel flow, aiming to investigate whether local ‘synthetic’ turbulence can be achieved and sustained for a period long enough at critical and subcritical Reynolds number. The range of Reynolds number (R

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31

(5930342), Shanmukeswar Rao Vankayala. "INVESTIGATION OF WALL-MODELED LARGE EDDY SIMULATIONS FOR JET AEROACOUSTICS." Thesis, 2019.

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In recent years, jet noise has been an active area of research due to an increase in the use of aircraft in both commercial and military applications. To meet the noise standards laid out by government agencies, novel nozzle design concepts are being developed with an aim to attenuate the noise levels. To reduce the high costs incurred by experiments, simulation techniques such as large eddy simulation (LES) in combination with a surface integral acoustic method have received much attention for investigating various nozzle concepts. LES is utilized to predict the unsteady flow in the nearfield

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32

Shih-HsinChien and 簡世欣. "Combined Effects of Thermophoresis and Electrophoresis on Particle Deposition from a Force Convection Flow in a Complex-Wavy Wall Channel." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/50111801669480878410.

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33

Mehdizadeh, Amirfarhang [Verfasser]. "Direct numerical simulation, Lie group analysis and modeling of a turbulent channel flow with wall-normal rotation / vorgelegt von Amirfarhang Mehdizadeh." 2010. http://d-nb.info/1001245741/34.

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34

Wei, Liang. "Direct Numerical Simulation of Compressible and Incompressible Wall Bounded Turbulent Flows with Pressure Gradients." Thesis, 2009. http://hdl.handle.net/1974/5366.

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This thesis is focused on direct numerical simulation (DNS) of compressible and incompressible fully developed and developing turbulent flows between isothermal walls using a discontinuous Galerkin method (DGM). Three cases (Ma = 0.2, 0.7 and 1.5) of DNS of turbulent channel flows between isothermal walls with Re ~ 2800, based on bulk velocity and half channel width, have been carried out. It is found that a power law seems to scale mean streamwise velocity with Ma slightly better than the more usual log-law. Inner and outer scaling of second-order and higher-order statistics have been analyze

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35

Srinivas, S. S. "Turbulence in Soft Walled Micro Channels." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2877.

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In comparison to the flow in a rigid channel, there is a multi-fold reduction in the transition Reynolds number for the flow in a micro channel when one of the walls is made sufficiently soft, due to a dynamical instability induced by the fluid-wall coupling. The flow after transition is characterized using Particle Image Velocimetry (PIV) in the x − y plane where x is the stream-wise direction and y is the cross-stream co-ordinate along the small dimension of the channel of height 0.2 − 0.3mm. For the two different soft walls of shear modulus 18 kPa and 2.19 kPaused here, the transition Reyno

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36

Srinivas, S. S. "Turbulence in Soft Walled Micro Channels." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2877.

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Анотація:

In comparison to the flow in a rigid channel, there is a multi-fold reduction in the transition Reynolds number for the flow in a micro channel when one of the walls is made sufficiently soft, due to a dynamical instability induced by the fluid-wall coupling. The flow after transition is characterized using Particle Image Velocimetry (PIV) in the x − y plane where x is the stream-wise direction and y is the cross-stream co-ordinate along the small dimension of the channel of height 0.2 − 0.3mm. For the two different soft walls of shear modulus 18 kPa and 2.19 kPaused here, the transition Reyno

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37

Chang, Henry 1976. "Modeling turbulence using optimal large eddy simulation." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-4988.

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Most flows in nature and engineering are turbulent, and many are wall-bounded. Further, in turbulent flows, the turbulence generally has a large impact on the behavior of the flow. It is therefore important to be able to predict the effects of turbulence in such flows. The Navier-Stokes equations are known to be an excellent model of the turbulence phenomenon. In simple geometries and low Reynolds numbers, very accurate numerical solutions of the Navier-Stokes equations (direct numerical simulation, or DNS) have been used to study the details of turbulent flows. However, DNS of high Reynolds n

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