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Dissertations / Theses on the topic 'Shear (Mechanics)'

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Published: 4 June 2021

Last updated: 29 July 2024

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1

Babarutsi, Sofia. "Modelling quasi-two-dimensional turbulent shear flow." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70223.

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A two-length-scale turbulence model is introduced in this thesis for the computation of quasi-two-dimensional turbulent shear flow with two distinct length scales of motion. In the model, the turbulence motions of the two distinct length scales are computed separately. The small-scale turbulence is treated as a background component locally in equilibrium while the large-scale turbulence is simulated using a second-order closure procedure. The development of the turbulent shear flows depends on the rate of energy transfer from the large-scale to the small-scale turbulence. Two mechanisms are identified to have a significant effect on the rate of this energy transfer. On one hand, the rate is reduced due to the confinement of the large-scale turbulence to two-dimensional motion, since the nonlinear energy cascade process is less efficient in two-dimensional turbulent motion. On the other hand, the rate is enhanced due to the work done by the large-scale turbulent motion against the friction forces. The energy transfer rate due to friction is derived in the model using a two-step averaging procedure, whereas the transfer rate due to nonlinear cascade process is determined using a model equation. The data from a number of experimental investigations of quasi-two-dimensional turbulent shear flows are analyzed. These data support the notion of the two-length-scale turbulence model, that (i) the maintenance of the turbulent motion depends on the transfer of energy from the large-scale turbulence to the small-scale turbulence, and (ii) the transfer rate is subjected to confinement and friction influences as specified in the model. Numerical computations are conducted using the two-length-scale model and a single-length-scale model. The results are compared with the experimental data. The two-length-scale model is superior in performance compared with the single-length-scale model, particularly in the intermediate region of the flow where both length scales of the turbule

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2

Douglas, Kurt John Civil &amp Environmental Engineering Faculty of Engineering UNSW. "The shear strength of rock masses." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2002. http://handle.unsw.edu.au/1959.4/19138.

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The first section of this thesis (Chapter 2) describes the creation and analysis of a database on concrete and masonry dam incidents known as CONGDATA. The aim was to carry out as complete a study of concrete and masonry dam incidents as was practicable, with a greater emphasis than in other studies on the geology, mode of failure, and the warning signs that were observed. This analysis was used to develop a method of very approximately assessing probabilities of failure. This can be used in initial risk assessments of large concrete and masonry dams along with analysis of stability for various annual exceedance probability floods. The second and main section of this thesis (Chapters 3-6) had its origins in the results of Chapter 2 and the general interests of the author. It was found that failure through the foundation was common in the list of dams analysed and that information on how to assess the strength of the foundations of dams on rock masses was limited. This section applies to all applications of rock mass strength such as the stability of rock slopes. Methods used for assessing the shear strength of jointed rock masses are based on empirical criteria. As a general rule such criteria are based on laboratory scale specimens with very little, and often no, field validation. The Hoek-Brown empirical rock mass failure criterion was developed in 1980 for hard rock masses. Since its development it has become virtually universally accepted and is now used for all types of rock masses and in all stress regimes. This thesis uses case studies and databases of intact rock and rockfill triaxial tests collated by the author to review the current Hoek-Brown criterion. The results highlight the inability of the criterion to fit all types of intact rock and poor quality rock masses. This arose predominately due to the exponent a being restrained to approximately 0.5 to 0.62 and using rock type as a predictor of mi. Modifications to the equations for determining the Hoek-Brown parameters are provided that overcome these problems. In the course of reviewing the Hoek-Brown criterion new equations were derived for estimating the shear strength of intact rock and rockfill. Empirical slope design curves have also been developed for use as a preliminary tool for slope design.

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3

Anandarajah, Arumugam. "Fracture mechanics of adhesive joints in shear." Thesis, University of Dundee, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357160.

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4

Park, Jin Young. "Pultruded composite materials under shear loading." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/32865.

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5

Mansfield-Williams, H. D. "Mode 11 fracture mechanics in solid wood and fracture mechanics in laminated veneer lumber." Thesis, Brunel University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390815.

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6

Dunham, David. "Unsteady fluid mechanics of annular swirling shear layers." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8483.

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The vast majority of gas turbine combustor systems employ swirl injectors to produce a central toroidal recirculation zone (CTRZ) which entrains and recirculates a portion of the hot combustion gases to provide continuous ignition to the incoming air-fuel mix. In addition to these primary functions, swirl injectors often generate multiple aerodynamic instability modes which are helical in nature with characteristic frequencies that can differ by many orders of magnitude. If any of these frequencies are consistent with prevalent acoustic modes within the combustor there is a potential for flow-acoustic coupling which may reinforce acoustic oscillations and drive combustion instabilities via the Rayleigh criterion. The aerodynamic performance of the swirl injector is thus of great practical importance to the design and development of combustion systems and there is a strong desire within industry for reliable computational methods that can predict this highly unsteady behaviour. This assessment can be made under isothermal conditions which avoids the complex interactions that occur in reacting flow. The goal of the present work was to compare and contrast the performance of Unsteady Reynolds- Averaged Navier-Stokes (URANS) and Large-Eddy Simulation (LES) CFD methodologies for a combustion system equipped with a derivative of an industrial Turbomeca swirl injector as this exhibits similar unsteady aerodynamic behaviour under reacting and isothermal conditions. The influence of the level of swirl, SN = 0.51−0.8, was first investigated experimentally using Particle Image Velocimetry (PIV) by varying the inlet swirl vane angle. Based on a qualitative assessment of instantaneous velocity data, and a range of coherent structure eduction techniques, it was found that ®1 = 30± (SN ¼ 0.8) would be the most challenging test case for LES and URANS as this contained near and far-field instability modes that differ in frequency by around two orders of magnitude and the highest levels of normal Reynolds-stress anisotropy. Based on extensive simulations performed with both in-house (LULES and Delta) and commercial (Fluent) CFD codes it was found that, despite the relative modest computational cost of URANS which is between one-third (RST) to an order of magnitude (k−²) less than that demanded by LES, only LES captures the all-important frequency content in accordance with experimental evidence and, thus, only LES can be recommended for use in swirl injector flows. The increased cost is believed to be an absolutely worthwhile expense because of the high fidelity of the predicted results in the important area of flow instabilities.

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7

Lyons, John C. "Strength of welded shear studs." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06102009-063157/.

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8

Stonebraker, Derek. "Iosipescu shear strength of reinforced concrete." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1654493741&sid=3&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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9

Yung, See Yuen. "Determination of shear wave velocity and anisotropic shear modulus of an unsaturated soil /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20YUNG.

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10

Szymakowski, Jerry. "Direct shear testing of jointed soft rock masses." Monash University, Dept. of Civil Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9573.

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11

Minnaar, Karel. "Comparison and analysis of dynamic shear failure behavior of structural metals." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16340.

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12

La, Vecchia Miriam. "Bacterial chemotaxis in non-homogeneous shear flow." Thesis, KTH, Mekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36075.

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13

Feng, Yanhua. "Stably stratified shear flow over complex terrain." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264359.

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14

Daish, N. C. "Shear dispersion problems in open-channel flows." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372648.

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15

Buckley, Margaret M. "Conditioning for shear in sludge dewatering." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09052009-040620/.

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16

LeBlanc, David N. "Beam shear connections to HSS composite columns." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63273.

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17

Hellum, Aren. "Intermittency and the viscous superlayer in a single stream shear layer." Diss., Connect to online resource - MSU authorized users, 2006.

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18

Hogg, Andrew J. "Particle migration and sediment transport in shear flows." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363288.

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19

Kaneko, Yoshio. "Modelling of shear-off failure of concrete : fracture mechanics approach." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13200.

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20

Yeganeh-Bakhtiary, Abbas. "Computational mechanics of bed-load transport at high bottom shear." Kyoto University, 1999. http://hdl.handle.net/2433/181776.

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21

Van, Bergen Barry. "The effect of mechanical shear on brewing yeast /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33036.

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The effect of mechanical shear on brewing yeast was investigated with a focus on losses incurred through cell rupture and viability loss. The influence of various environmental conditions was studied with regards to the influence on Saccharomyces cerevisiae's ability to resist mechanical shear. Further investigation was performed in order to locate a structure within the yeast cell that contributes to mechanical shear resistance.
It was found that yeast cells grown anaerobically in limited glucose media were more prone to losses in cell viability than cells grown aerobically in the same media, when subjected to mechanical shear. Cells grown anaerobically in high glucose concentrations and allowed to ferment the media to exhaustion were slightly more resistant to mechanical shear compared to cells grown anaerobically without fermentation in minimal glucose media. Higher ethanol concentrations lead to marginally decreased resistance to mechanical shear.
Cell walls of S. cerevisiae were partially digested or extracted using enzymatic treatment or chemical attack. It was found that while the outer mannoprotein layer does not contribute significantly, the inner beta-(1 → 3)-glucan structure plays a significant role in resistance to mechanical shear.

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22

Bergström, Jonathan, and Christoffer Åhman. "Shear strain rate dependency of expanded polystyrene foam." Thesis, KTH, Hållfasthetslära (Inst.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254623.

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23

Cheng, Pei-fen Caral. "Project report on direct shear tests for rock joints." Click to view the E-thesis via HKUTO, 2002. http://sunzi.lib.hku.hk/hkuto/record/B42576659.

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24

Tika, Theodora Michael. "The effect of rate of shear on the residual strength of soil." Online version, 1989. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.286384.

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25

Li, Yao. "Shear behaviour of sand in bi-directional direct simple shear tests." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37279/.

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In geotechnical engineering, soil is subject to shear stress, as well as normal stress. In many cases, soil is sheared along multiple directions, such as an embankment under earthquake loading and foundation soil of a structure under a complex loading. In recent years, significant research has been devoted to understanding the static and cyclic shear behaviour of sand under complex stress conditions. To investigate the shear behaviours of soils, a few testing devices have been specifically developed. The most commonly used apparatuses are direct shear, direct simple shear, and hollow cylinder apparatuses. While each has its own merits, they share one common limitation. That is the soil specimens are sheared along only one direction in these devices, making it impossible to study the soil responses under multiple shear stresses encountered in many geotechnical engineering problems. It is widely acknowledged that testing stress path has a significant effect on shear stress, so specimens must be examined under a stress path similar to in-situ. In many cases, a simple shear apparatus closely duplicates the stress conditions in soil elements, and a bi-directional direct simple shear apparatus can create complex stress conditions. To investigate the shear behaviour of soils subject to complex loading conditions, several studies of multidirectional simple shear testing were performed on the first commercially available Variable Direction Dynamic Cyclic Simple Shear (VDDCSS) system. In the VDDCSS, the secondary shear actuator acting at 90 degrees to the primary shear actuator enables it to add shear stress in any horizontal direction. Various previously unexplored complex stress paths were tested in this study using the VDDCSS. Sand samples of Leighton Buzzard sand (Fraction B) were first subjected to consolidation shear stresses under drained conditions along different directions (from 0° to 180° to the X direction of the apparatus), followed by monotonic or cyclic secondary shear stresses along 0° until failure occurs. The magnitude and direction of the consolidation shear stress on the static and cyclic secondary shear behaviours of sand were systematically studied. In undrained static tests, soil strength was the lowest when the angles between the two shears stresses were near 90°, and the strength was the highest at 0°. In addition, a smaller angle produced a more brittle response, and a greater angle led to a more ductile response. The effect of stress path (the direction of consolidation shear stresses) was found to be more significant in tests with a greater magnitude of consolidation shear stresses, and the relationship between the angles (between the first shear stresses and secondary shear stresses) and shear behaviours was much more complex when the magnitude of consolidation shear stresses was increased. In drained static tests, the evidence of non-coaxiality was obtained. The non-coaxiality was the greatest at the initial stage of shearing, and it decreased to zero at higher shear strains. The degree of non-coaxiality was affected by the relative density of the specimen, vertical stress, level and direction of consolidation shear stress. In addition, the non-coaxiality was significantly affected by the consolidation shear stress, and the effect increased at a greater magnitude of consolidation shear stresses. The non-coaxiality increased as the angle was increased. In stress-controlled undrained dynamic tests, there was no significant difference in pore water generation rate among samples with consolidation shear stresses in different directions. However, samples with different directions of consolidation shear stresses failed at different numbers of cycles and in different directions. Liquefaction resistance was decreased by the increased magnitude of consolidation shear stress. In most of the tests with consolidation shear stress, the levels of liquefaction resistances were lower than that without consolidation shear stress. In strain-controlled undrained dynamic tests, liquefaction resistance (shear strength) was decreased from 0° to 90°, and increased from 90° to 180°. Liquefaction resistance in tests with consolidation shear stresses were lower than those without consolidation shear stress.

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26

Oljaca, Miodrag. "Optical phase distortions in a plane shear layer." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/18178.

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27

Zhang, Yanhong. "An investigation of shear response of composite material systems." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-10042006-143846/.

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28

Kwan, Herman Ho Ming. "Multilayer beam analysis including shear and geometric nonlinear effects." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26711.

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This thesis presents an analysis and experimental verification for a multilayer beam in bending. The formulation of the theoretical analysis includes the combined effect of shear and geometric nonlinearity. From this formulation, a finite element program (CUBES) is developed. The experimental tests were done on multilayer, corrugated paper beams. Failure deflections and loads are thus obtained. The experimental results are reasonably predicted by the numerical results. Based upon this comparison, a maximum compressive stress is determined for the tested beam. Finally, design curves for the tested beam are drawn using the determined maximum compressive stress and the finite element program.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate

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29

Cheng, Pei-fen Caral, and 鄭佩芬. "Project report on direct shear tests for rock joints." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42576659.

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30

Jiang, Feng. "The development of linear wave packets in unbounded shear flows." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385425.

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31

Broughton, William Richard. "Shear properties of unidirectional carbon fibre composites." Thesis, University of Cambridge, 1990. https://www.repository.cam.ac.uk/handle/1810/250965.

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32

Ramirez, Amanda Christine. "Microstructural properties associated with adiabatic shear bands in Ti-6A1-4V deformed by ballistic impact." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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33

Pearce, Helen A(Helen Annette) 1971. "Experimental and analytical investigation into the shear behaviour of rock joints." Monash University, Dept. of Civil Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/8267.

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34

Cho, Gye Chun. "Unsaturated soil stiffness and post-liquefaction shear strength." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/21010.

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35

Zhou, Guolin, and 周國林. "Complete stress-strain behavior for shear failure of rocks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B42575679.

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36

Zhou, Guolin. "Complete stress-strain behavior for shear failure of rocks." Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/hkuto/record/B42575679.

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37

Lacoul, Sriranjan. "Consolidated-drained shear-strength of unsaturated soil." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66044.

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38

Huber, U. A. "Reliability of reinforced concrete shear resistance." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/50435.

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Thesis (MScEng)--University of Stellenbosch, 2005.
ENGLISH ABSTRACT: The lack of a simple rational mechanical model for the shear resistance behaviour of structural concrete members results in the use of simplified empirical methods in codified shear design methods with a limited range of applicability. This may lead on the one hand to insufficient reliability for members on the boundary of the range of applicability and on the other hand to over-conservative designs. Comparison of the provision for shear resistance design of the South African code of practice for the design of concrete structures SANS 10100: 2003 with other related codes shows differences in the design variables taken into account and procedures specified to calculate shear resistance. The thesis describes a systematic evaluation of the reliability performance of the shear performance of reinforced concrete sections subjected to shear only, and in combination with flexural moments, designed with SANS 10100: 2003. Both sections with and without provision for shear reinforcement are considered. A representative range of parametric conditions are considered in the evaluation. Punching shear is not considered in the present review. Shear design as specified by SANS 10100 is compared to the provisions of the closely related British code for the structural use of concrete BS 8110, Eurocode 2 for the design of concrete structures EN 1992 and the American bridge design code AASHTO LRFD. The reliability performance of the shear design method for beams of SANS is considered in terms of a probabilistic shear resistance model, uncertainties in the basic variables such as material properties, geometry and modelling uncertainty. Modelling uncertainty is determined by comparing predicted values with published experimental results. Keywords: structural concrete; shear resistance; shear design; reliability; design codes; code companson
AFRIKAANSE OPSOMMING: Die tekortkoming van eenvoudige rasionele modelle vir skuif gedrag van strukturele gewapende beton lei tot die gebruik van vereenvoudigde empiriese metodes in gekodifiseerde skuif ontwerp met 'n beperkte omvang van gebruik. Dit mag lei tot onvoeldoende betroubaarheid vir ontwerp situasies, maar ook tot oorkonserwatiewe ontwerpe. Vergelyking van voorsienings vir skuifweerstand ontwerp in die SANS beton kode, SANS 10100: 2003 en ander verwante kodes toon verskille in ontwerp veranderings en metodes aan vir die berekening van skuifweerstand. Hierdie tesis beskryf die stelselmatige bepaling van betroubaarheids prestasie van die skuifgedrag van gewapende beton snitte ontwerp volgens SANS. Beide snitte met en sonder skuifbewapening word behandel. 'n Verteenwoordigende bestek van skuif ontwerp parameters word in ag geneem in die beoordeling van die betroubaarheid. Pons skuifword nie hier in ag geneem nie. Skuif ontwerp soos voorgeskryf deur SANS 10100 word verlyk met die ontwerp methodes van die Britse beten kode, BS 8110, die Europese beton kode, Euronorm Eurocode 2 en die Amerikaanse brug kode AASHTO LRFD. Die betroubaarheids prestasie van die skuif ontwerp metode vir SANS word bepaal deur middel van 'n probablistiese skuif ontwerp model. Modelonsekerheid is vir die doeleindes bepaal deur vergelyking met gepubliseerde eksperimentele resultate. Sleutelwoorde: strukturele beton; skuifweerstand; skuif ontwerp; betroubaarheid; ontwerp kodes; kode vergelyking.

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39

Loulizi, Amara. "Comparison of design methods for shear in reinforced concrete beams." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09052009-040428/.

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40

Conklin, Brian Scott. "The effects of fluid shear stress on endothelial cell barrier function." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/17221.

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41

Aydemir, Murat E. "Moment shear interaction in HPS hybrid plate girders." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20968.

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42

Shang, Qinjiang. "Shear Behaviour of Engineered Cement-based Composites." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1201.

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43

Cunningham, Mark Robert. "The mechanical behaviour of a reconstituted, unsaturated soil." Thesis, Imperial College London, 2000. http://hdl.handle.net/10044/1/8699.

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44

Graham, Drew Abram. "Performance of log shear walls and lag screw connections subjected to monotonic and reverse-cyclic loading." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/d%5Fgraham%5F030607.pdf.

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45

Murphy, Justin James. "Kinematics, partitioning and the relationship between velocity and strain in shear zones." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Summer2007/j_murphy_061907.pdf.

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46

Zhang, Qinghe. "Development of skew correction factors for live load shear and reaction distribution in highway bridge design a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1707210441&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268938179&clientId=28564.

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47

Ansari, Kamran. "Boundary shear stress distribution and flow structures in trapezoidal channels." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/13006/.

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The commercially available Computational Fluid Dynamics (CFD) software ANSYS-CFX version 11 (2008) is employed to predict the distribution of the bed and sidewall shear stresses in trapezoidal open channels. The investigation includes computation of wall shear stress (1) directly, using CFD for a range of channels layouts (straight, turning, with ridges), and (2), building on the division line concept initially formulated by Leighly in 1932 and later by Einstein in 1942, through the evaluation of the Guo and Julien (2005) equations, as proposed by Cacqueray et al. (2009). These equations include the two complex integral terms II and III, pertaining to viscous and secondary current effects, have been analysed for each cross section, for straight channels. The CFD predictions are validated first against the experimental results of Tominaga et al. (1989) to ensure that the models used are appropriate. Once this is done, the impact of (1) the variation of the slant angle of the sidewalls, (2) the channel aspect ratio and (3) the composite roughness on the shear stress distribution in straight prismatic channels is analysed directly based on the CFD predictions. In wide open channels the lines of boil, consisting of low speed streaks, periodically in the transverse direction, is believed to be due to the initiation of sand ridges on the bed; in other words due to the coupled interaction between moving bed and flow. A numerical analysis on the flow structures created and the distribution of shear stresses on the bed and sidewalls of channel sections having ridges on its bed is therefore carried out to clarify this point and assess the potential consequences on our predictions. Finally, because of obvious practical relevance, as most rivers follow a winding course, numerical simulations on the distribution of shear on the boundaries inside a channel bend is also presented.

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48

Sivapuratharasu, Mithilan. "Inertial effects on thin-film wave structures with imposed surface shear." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/42569/.

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This thesis provides a depth-averaged analytical and numerical approach to the mathematical simulation of thin-film flow on a flat inclined plane relevant to gravity-driven flows subject to high surface shear. Motivated by modelling thin-film structures within an industrial context, wave structures are investigated for flows with moderate inertial effects and small film depth aspect ratio e. Approximations are made assuming a Reynolds number, Re ~O (1/e) and a depth-averaged approach used to simplify the governing Navier-Stokes equations. A classical, parallel, Stokes flow is expected in the absence of any wave disturbance based on a local quadratic profile; in this work a generalised approach, which includes inertial effects, is solved. Flow structures are identified and compared with studies for Stokes flow in the limit of negligible inertial effects. Both two-tier and three-tier wave disturbances are constructed to study film profile evolution subject to shear at the free surface. An evaluation of film profiles is given from a paramet- ric study for wave disturbances with increasing film Reynolds number. An evaluation of standing wave and transient film profiles is undertaken which identifies new profiles not previously predicted when inertial effects are neglected. A revised integral boundary layer model incorporating a more general cubic velocity profile is also introduced, to better capture fluid re- circulation associated with a capillary region, and is developed to provide a better understanding of the internal flow dynamics within the thin-film layer. Notably, the wavelength and amplitude of the capillary ripples are analysed. The effect of the boundary conditions between the fluid and the plane is undertaken to simulate slip properties of various substrates over which the fluid may flow. A Navier slip condition is proposed at this boundary and its effect on the wave structure is examined both with and without the inclusion of inertia. The corresponding film dynamics are analysed with increased slip at the fluid-plane boundary and the effect on the wave structures formed are discussed. In a subsequent chapter solitary wave structures are investigated through a study of gravity-driven flow structures as associated with an oscillating inlet. The effects of increasing the film Reynolds number of these flows is evaluated together with an investigation of the stability characteristics relevant to inlet frequency and inertial effects. The effect of surface shear on solitary waves is examined, both as a stabilising and a destabilising factor on perturbations introduced at the inlet. A final section provides an overview of the outcomes from this study.

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Budiman, Haryanto Tiara. "An assessment of subscale notched specimens for composites shear property measurement." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-09052009-040300/.

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50

Zsurka, Mark Stefan. "Enhancement of the diffusion of a passive scalar by the introduction of a particulate phase in microfluidic channels." Diss., Online access via UMI:, 2007.

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