subject:(free surface waves)

University of New South Wales

1. Saket, Arvin. Breaking for 2D and 3D gravity wave groups in deep and transitional water.

Degree: Civil & Environmental Engineering, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/58026 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45318/SOURCE02?view=true

► Water wave breaking is a dominant dynamical process of the upper ocean,inducing strong flow-turbulence-wave interactions and air-sea exchanges. Afundamental and long-standing gap in the understanding… (more)

▼ Water wave breaking is a dominant dynamical process of the upper ocean,inducing strong flow-turbulence-wave interactions and air-sea exchanges. Afundamental and long-standing gap in the understanding of wave breaking ishow to characterise and predict the onset of breaking.The threshold for the onset of breaking proposed by Barthelemy et al.(arXiv:1508.06002v1, 2015) has been investigated intensively in thelaboratory for different classes of two- and three-dimensional wave groups indeep and transitional water in the absence and presence of wind. ThermalImage Velocimetry was used to compare measurements of the wave crestsurface water particle velocity with the wave crest speed determined by anarray of closely-spaced wave gauges.For the first time, a threshold crest point surface energy flux ratio (Bx) thatdistinguishes maximum group recurrence from marginal group breaking hasbeen established for gravity waves. The critical value of Bx was found to be0.835 ± 0.005 with an experimental uncertainty of each data point of ±0.020.The breaking threshold is robust for different types of unidirectional anddirectional wave groups. Very weak dependence on wind forcing andgroup bandwidth is demonstrated. No dependence on relative water depthwas observed. If there is a dependence on peak spectral wavenumber, it isweak and negligible for the scales achievable in a large-scale laboratory.This study provides more robust and universal characterisation of breakingin transitional water than the empirical non-dimensionalisation of Nelson(1994). The effect of wave grouping can generate marginally breaking wavesin shallower water that are at least 30 % greater than the limit proposed byNelson. The study supports use of a limit at least that recommended byMcCowan (1894)/Miche (1944) for coastal engineering design in transitionaland shallow water until it is demonstrated that there is negligible riskof strongly breaking group waves achieving higher breaker indices. Advisors/Committee Members: Peirson, William, Civil & Environmental Engineering, Faculty of Engineering, UNSW, Banner, Michael, Mathematics & Statistics, Faculty of Science, UNSW.

Subjects/Keywords: Waves/free-surface flows; Surface gravity waves; Wave breaking

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APA (6^th Edition):

Saket, A. (2017). Breaking for 2D and 3D gravity wave groups in deep and transitional water. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58026 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45318/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Saket, Arvin. “Breaking for 2D and 3D gravity wave groups in deep and transitional water.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 28, 2021. http://handle.unsw.edu.au/1959.4/58026 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45318/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Saket, Arvin. “Breaking for 2D and 3D gravity wave groups in deep and transitional water.” 2017. Web. 28 Jan 2021.

Vancouver:

Saket A. Breaking for 2D and 3D gravity wave groups in deep and transitional water. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 28]. Available from: http://handle.unsw.edu.au/1959.4/58026 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45318/SOURCE02?view=true.

Council of Science Editors:

Saket A. Breaking for 2D and 3D gravity wave groups in deep and transitional water. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/58026 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45318/SOURCE02?view=true

University of Maryland

2. Masnadi, Naeem. Dynamics of Nonlinear Gravity-Capillary Waves in Deep Water Near Resonance.

Degree: Mechanical Engineering, 2016, University of Maryland

URL: http://hdl.handle.net/1903/19033

► The minimum phase speed of linear gravity-capillary waves in deep water (c_min) is known to be the bifurcation point of three-dimensional solitary waves (``lumps"). In… (more)

▼ The minimum phase speed of linear gravity-capillary waves in deep water (c_min) is known to be the bifurcation point of three-dimensional solitary waves (``lumps"). In the present thesis, various aspects of unsteady gravity-capillary lumps are investigated in the context of three sets of experiments. In the first set, cinematic shadowgraph and refraction-based techniques are utilized to measure the temporal evolution of the free surface deformation pattern downstream of a surface pressure source as it moves along a towing tank, while numerical simulations using a model equation are used to extend the experimental results. The focus of this study is on exploring the characteristics of the observed periodic shedding of lump-like depressions for towing speeds close to c_min. From the experiments, it is found that the speed-amplitude characteristics and the shape of the depressions are nearly the same as those of the freely propagating gravity-capillary lumps of inviscid potential theory. The periodic behavior is found to be analogous to the periodic generation of two-dimensional solitary waves in shallow water by a source moving at trans-critical speeds of pure gravity waves. In the second set of experiments, the effect of viscous dissipation on freely propagating lumps is examined. A steady forced lump is first generated by applying appropriate forcing and towing speed. The forcing is then removed suddenly and the change in shape and speed of the lump is measured as it propagates freely under the action of viscosity. It is found that the localized structure of the lump is maintained during the decay and the first measurement of the decay rate of gravity-capillary lumps is reported. In the third set of experiments, the interactions of state III lumps generated by two pressure sources moving in parallel straight lines are investigated. The sources are adjusted to produce nearly identical periodic responses. The first lump generated by each source, collides with the lump from the other source in the center-plane of the two sources. It was observed that a steep depression is formed during the collision but breaks up soon after and radiates energy away in the form of small-amplitude radial waves. After the collision, a quasi-steady pattern is formed with several rows of localized depressions that are similar to lumps but exhibit periodic oscillations in depth. Advisors/Committee Members: Duncan, James H (advisor).

Subjects/Keywords: Mechanical engineering; Bifurcation; Free surface flows; Gravity-capillary waves; Nonlinear waves; Solitary waves; Water waves

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APA (6^th Edition):

Masnadi, N. (2016). Dynamics of Nonlinear Gravity-Capillary Waves in Deep Water Near Resonance. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/19033

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Masnadi, Naeem. “Dynamics of Nonlinear Gravity-Capillary Waves in Deep Water Near Resonance.” 2016. Thesis, University of Maryland. Accessed January 28, 2021. http://hdl.handle.net/1903/19033.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Masnadi, Naeem. “Dynamics of Nonlinear Gravity-Capillary Waves in Deep Water Near Resonance.” 2016. Web. 28 Jan 2021.

Vancouver:

Masnadi N. Dynamics of Nonlinear Gravity-Capillary Waves in Deep Water Near Resonance. [Internet] [Thesis]. University of Maryland; 2016. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/1903/19033.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Masnadi N. Dynamics of Nonlinear Gravity-Capillary Waves in Deep Water Near Resonance. [Thesis]. University of Maryland; 2016. Available from: http://hdl.handle.net/1903/19033

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Adelaide

3. Keeler, Jack Samuel. Free surface flow over bottom topography.

Degree: 2018, University of Adelaide

URL: http://hdl.handle.net/2440/115164

► This thesis explores flow in a channel over a bottom topography. In particular, the problem of finding the shape of the unknown free-surface if the… (more)

▼ This thesis explores flow in a channel over a bottom topography. In particular, the problem of finding the shape of the unknown free-surface if the bottom topography is prescribed forms the main problem of this thesis. In chapter 2 the forced Korteweg De- Vries equation is derived from first principles as a model partial differential equation that determines the shape of the unknown free-surface profile in terms of the topogra- phy. A discussion of the steady solution space when the forcing is highly localised is also presented. In chapter 3 flow over bottom topography at critical Froude number (when F = 1) is examined. For large amplitude negative Gaussian forcing, asymptotic solutions are constructed using boundary layer theory; one point of interest here is an internal layer away from the origin which mediates a change from exponential decay away from the central dip to algebraic decay in the far-field. Intriguingly, solutions with different numbers of waves trapped around the central dip are also found for large amplitude topography but these cannot be captured by the boundary-layer analysis. In fact a seemingly infinite sequence of solution branches is uncovered using numerical methods and a nonlinear multiple-scales technique, and in general the solution for any given topography amplitude is non-unique. In addition to these results the stability of the steady solutions is examined using numerical simulations, linear stability analysis and formal stability analysis. In chapter 4 the issue of existence of steady solutions is analysed for an algebraically decaying topography at critical flow speed. For this topography the analysis is subtle and numerical solutions have to be treated with care. In chapter 5 the solution space is studied for varying Froude number for flow over a corrugated topography where a rich solution space is discovered. Finally, preliminary work on the three-dimensional analogue of the fKdV equation, namely the fKP equa- tion is presented, including a novel result regarding three-dimensional solitary waves that decay in all spatial directions. Advisors/Committee Members: Binder, Benjamin (advisor), School of Mathematical Sciences (school).

Subjects/Keywords: fluid mechanics; non-linear waves; free-surface flows; asymptotic expansions

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APA (6^th Edition):

Keeler, J. S. (2018). Free surface flow over bottom topography. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/115164

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Keeler, Jack Samuel. “Free surface flow over bottom topography.” 2018. Thesis, University of Adelaide. Accessed January 28, 2021. http://hdl.handle.net/2440/115164.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Keeler, Jack Samuel. “Free surface flow over bottom topography.” 2018. Web. 28 Jan 2021.

Vancouver:

Keeler JS. Free surface flow over bottom topography. [Internet] [Thesis]. University of Adelaide; 2018. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/2440/115164.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Keeler JS. Free surface flow over bottom topography. [Thesis]. University of Adelaide; 2018. Available from: http://hdl.handle.net/2440/115164

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

4. Sosa Jones, Giselle. Space-time hybridizable discontinuous Galerkin methods for free-surface wave problems.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/16192

► Free-surface problems arise in many real-world applications such as in the design of ships and offshore structures, modeling of tsunamis, and dam breaking. Mathematically, free-surface… (more)

▼ Free-surface problems arise in many real-world applications such as in the design of ships and offshore structures, modeling of tsunamis, and dam breaking. Mathematically, free-surface wave problems are described by a set of partial differential equations that govern the movement of the fluid together with certain boundary conditions that describe the free-surface. The numerical solution of such problems is challenging because the boundary of the computational domain depends on the solution of the problem. This implies that there is a strong coupling between the fluid and the free-surface, and the domain must be continuously updated to track the changes in the free-surface. In this thesis we explore and develop space-time hybridizable discontinuous Galerkin (HDG) methods for free-surface problems. First, we focus on a linear free-surface problem in which the amplitude of the waves is assumed to be small enough so that the domain can remain fixed. We initially consider a traditional approach for the numerical discretization of time-dependent partial differential equations: we discretize in space using, in this case, an HDG method to obtain an ordinary differential equation. Then, we use a second order backward differentiation formula to discretize in time. We see that in comparison to an interior penalty discontinuous Galerkin discretization, this HDG discretization results in smaller linear systems (in general), and produces better approximations to the velocity of the fluid. Next, we consider the solution of the same linear free-surface problem with a space-time hybridizable discontinuous Galerkin method. Unlike previous finite element discretizations of this problem, we consider a mixed formulation in which the velocity of the flow can be approximated with an optimal order of convergence. We develop a set of space-time analysis tools that allow us to obtain a priori error estimates in which the dependency on the spatial mesh size and the time step is explicit. This is in contrast to previous space-time error analyses in which the error bounds depend on the size of the space-time elements. Finally, we move on to incompressible nonlinear free-surface flow. We consider the two-fluid (gas and liquid) Navier-Stokes equations and use a level set method in which the flow and the level set equations are solved subsequently until a certain stopping criterion has been met. The flow equations are solved with a space-time HDG method which is exactly mass conserving. Furthermore, a space-time embedded discontinuous Galerkin method is employed for the solution of the level set equation. This discretization possesses the same conservation and stability properties as discontinuous Galerkin methods, but produces a continuous approximation to the free-surface elevation. When a discontinuous approximation to the free-surface elevation is obtained, smoothing techniques have to be applied in order to move the mesh and track the interface. It has been shown in the past that such techniques can lead to instabilities and…

Subjects/Keywords: free-surface waves; space-time methods; hybridizable discontinuous Galerkin methods

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APA (6^th Edition):

Sosa Jones, G. (2020). Space-time hybridizable discontinuous Galerkin methods for free-surface wave problems. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sosa Jones, Giselle. “Space-time hybridizable discontinuous Galerkin methods for free-surface wave problems.” 2020. Thesis, University of Waterloo. Accessed January 28, 2021. http://hdl.handle.net/10012/16192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sosa Jones, Giselle. “Space-time hybridizable discontinuous Galerkin methods for free-surface wave problems.” 2020. Web. 28 Jan 2021.

Vancouver:

Sosa Jones G. Space-time hybridizable discontinuous Galerkin methods for free-surface wave problems. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/10012/16192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sosa Jones G. Space-time hybridizable discontinuous Galerkin methods for free-surface wave problems. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

5. Meijer, Moos (author). Isogeometric Potential Flow Analysis of Linear Surface Waves.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:0e0fc9c8-6c42-465e-9fb5-41342aa04f84

► In numerical methods, correct geometry description and mesh refinement are a challenge. By using a more geometrically based Finite Element Analysis (FEA) type method called… (more)

▼ In numerical methods, correct geometry description and mesh refinement are a challenge. By using a more geometrically based Finite Element Analysis (FEA) type method called ‘Isogeometric Analysis’ (IGA), exact geometry description can be attained, even on coarse meshes. Furthermore, mesh refinement is relatively easy, since no communication with a geometry description is necessary. From a maritime perspective, this method seems to be very interesting. Therefore, a first step towards an all-inclusive IGA framework for potential flow problems of ships and offshore structures is made by using IGA to solve linear free surface waves in a bounded 2D and 3D domain. The goal of this thesis is twofold. The first goal is finding out which of three weak formulations is best suited for further development. The second goal is testing the advantages of IGA in a potential frame work. A secondary goal is testing MFEM, the C++ finite element library that was used. These goals were reached by testing the three formulations on (1) a sloshing wave, (2) an airy wave and (3) a step wave in a square tank of 1 square m and (4) a sloshing wave in a cubic tank of 1 cubic m3with a cylinder in the middle. The first two have analytical solutions that can be used for verification and validation, the last two are used to compare standard FEA with IGA. The three weak formulations are formed by transforming the strong problem definition into three different weak forms. The main difference between these three being the way the boundary conditions are implemented. The first, reduced formulation is formed by combining the free surface boundary conditions, the second, mixed formulation by implementing all three boundary conditions directly and the third decoupled formulation by decoupling the problem into a free surface and an interior part. The first formulation is the simplest, but is hard to extend towards more complicated problems and is therefore used as a reference solution. The mixed and decoupled formulations are more complicated but can be extended. The first two tests showed that the reduced and mixed formulations have identical results. These results were very accurate: the wave period could be calculated accurately for coarse meshes and, very important, energy was conserved perfectly. The results for the decoupled formulation were significantly worse: more refined meshes were needed to calculate the wave period accurately and the energy showed periodic behaviour. The last two tests demonstrated that IGA offers results comparable to FEA for less degrees of freedom. The more difficult geometry of the fourth problem was much better represented by IGA. Advisors/Committee Members: Akkerman, Ido (mentor), ten Eikelder, Marco (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Hydromechanics; isogeometric analysis; Finite Element Analysis; Linear; Free Surface; Waves

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APA (6^th Edition):

Meijer, M. (. (2018). Isogeometric Potential Flow Analysis of Linear Surface Waves. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0e0fc9c8-6c42-465e-9fb5-41342aa04f84

Chicago Manual of Style (16^th Edition):

Meijer, Moos (author). “Isogeometric Potential Flow Analysis of Linear Surface Waves.” 2018. Masters Thesis, Delft University of Technology. Accessed January 28, 2021. http://resolver.tudelft.nl/uuid:0e0fc9c8-6c42-465e-9fb5-41342aa04f84.

MLA Handbook (7^th Edition):

Meijer, Moos (author). “Isogeometric Potential Flow Analysis of Linear Surface Waves.” 2018. Web. 28 Jan 2021.

Vancouver:

Meijer M(. Isogeometric Potential Flow Analysis of Linear Surface Waves. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 28]. Available from: http://resolver.tudelft.nl/uuid:0e0fc9c8-6c42-465e-9fb5-41342aa04f84.

Council of Science Editors:

Meijer M(. Isogeometric Potential Flow Analysis of Linear Surface Waves. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:0e0fc9c8-6c42-465e-9fb5-41342aa04f84

Victoria University of Wellington

6. Kortink, Megan. Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach.

Degree: 2020, Victoria University of Wellington

URL: http://hdl.handle.net/10063/8928

► Seismic velocity changes before and after large magnitude earthquakes carry information about damage present within the faults in the surrounding region. In this thesis, temporal… (more)

▼ Seismic velocity changes before and after large magnitude earthquakes carry information about damage present within the faults in the surrounding region. In this thesis, temporal velocity changes are measured before and after the 2016 Kaikōura earthquake using ambient noise interferometry between 2012 - 2018. This period contains the Mw 7.8 2016 Kaikoura earthquake as well as the 2013 Cook Strait earthquake sequence and a few deep large magnitude earthquakes in 2015 - 2016. Three primary objectives are identified: (1) investigate seismic velocity changes in the Kaikōura region and their connection to the 2016 Kaikōura earthquake to try and determine if there was a change before/after the earthquake, (2) determine how this change varied across the region, and (3) consider if ambient noise can lead to improved detection and understanding of geological hazard. The primary approach used to measure velocity changes in the Kaikōura region involved cross correlating noise recorded by seismic stations across the region. Velocity changes are sought by averaging the best result from multiple onshore station pairs. A secondary approach was also used, in which specific station pairs were averaged to determine if there were more localised velocity changes over more specific regions. This was to determine if the velocity changes observed following the 2016 Kaikōura earthquake occurred over the entire ruptured region. Following the 2016 Kaikōura earthquake a velocity decrease of 0.24±0.02% was observed on the average of the vertical-vertical components for eight stations. The remaining eight cross-component pairs showed a smaller seismic decrease with an average value of 0.22±0.05%. After the decrease following the Kaikōura earthquake, there is a steady velocity increase of 0.13±0.02% over a one-and-a-half-year period. This indicates that prior to the earthquake, seismic velocity was at a steady state until it was perturbed by the Kaikōura earthquake, and seismic velocities rapidly decreased over all stations. Across the region, stations with a longer interstation distance and further away from ruptured faults had a smaller decrease in velocity than station pairs with a smaller interstation distance that were closer to ruptured faults. We interpret the velocity decrease following the Kaikōura earthquake as a result of cracks opening during the earthquake. The velocity increase following the earthquake is indicative of the cracks slowly healing. The Cook Strait earthquake sequence that occurred in 2013 did not cause any velocity changes at the stations used in this thesis. This has been interpreted to be because the changes were too small compared to the background noise or the stations were not recording during the time of the earthquake sequence. Two other decreases were also observed in the region following two deep earthquakes in April 2015 (Mw 6.2, depth = 52km) and February 2016 (Mw 5.7, depth = 48km). Both of these events resulted in a small seismic decrease of 0.1±0.02%. Although these earthquakes were close to seismic… Advisors/Committee Members: Savage, Martha.

Subjects/Keywords: Seismic noise; Surface waves and free oscillations; New Zealand; Wave propagation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kortink, M. (2020). Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8928

Chicago Manual of Style (16^th Edition):

Kortink, Megan. “Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach.” 2020. Masters Thesis, Victoria University of Wellington. Accessed January 28, 2021. http://hdl.handle.net/10063/8928.

MLA Handbook (7^th Edition):

Kortink, Megan. “Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach.” 2020. Web. 28 Jan 2021.

Vancouver:

Kortink M. Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach. [Internet] [Masters thesis]. Victoria University of Wellington; 2020. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/10063/8928.

Council of Science Editors:

Kortink M. Effect of the Kaikōura Earthquake on Velocity Changes In and Around the Ruptured Region: A Noise Cross-Correlation Approach. [Masters Thesis]. Victoria University of Wellington; 2020. Available from: http://hdl.handle.net/10063/8928

Brno University of Technology

7. Kajánková, Dominika. Šíření vln na otevřené hladině: The propagation of the open surface waves.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/178866

► Water covers majority of planet, waves, forming on its surface, are without any doubt part of it. The aim of this work is to make… (more)

Subjects/Keywords: povrchové vlny; voľná hladina; tsunami; protipovodňová ochrana; surface waves; free surface; tsunami; flood protection

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APA (6^th Edition):

Kajánková, D. (2019). Šíření vln na otevřené hladině: The propagation of the open surface waves. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/178866

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kajánková, Dominika. “Šíření vln na otevřené hladině: The propagation of the open surface waves.” 2019. Thesis, Brno University of Technology. Accessed January 28, 2021. http://hdl.handle.net/11012/178866.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kajánková, Dominika. “Šíření vln na otevřené hladině: The propagation of the open surface waves.” 2019. Web. 28 Jan 2021.

Vancouver:

Kajánková D. Šíření vln na otevřené hladině: The propagation of the open surface waves. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/11012/178866.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kajánková D. Šíření vln na otevřené hladině: The propagation of the open surface waves. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/178866

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

8. Russell, Aaron Stephen. Frictional Hysteresis in Granular Avalanches.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322853

► Geophysical mass flows often occur on inclines covered by a static layer of erodible granular material, which once disturbed initiates a flow downslope that grows… (more)

▼ Geophysical mass flows often occur on inclines covered by a static layer of erodible granular material, which once disturbed initiates a flow downslope that grows in size as it erodes additional material, posing a hazard to the local population. If the slope is sufficiently steep, material upslope of the disturbance can also be eroded via an upslope-propagating erosion wave, or retrogressive failure, which increases the volume of the flow, posing an increased hazard. This thesis aims to gain an insight into this complex phenomenon using a combination of continuum models, small-scale laboratory experiments and numerical simulations. Shallow dry granular flows over a rough plane inclined at an angle ζ to the horizontal exhibit a wide range of hysteretic behaviour, the simplest of which is that when a steady uniform granular flow is brought to rest it leaves a deposit of thickness hstop(ζ), but this layer will not start to flow spontaneously unless it is inclined to a greater angle ζstart. This frictional hysteresis is directly responsible for flows with co-existing regions of solid-like and fluid-like behaviour such as retrogressive failures, self channelised flows with static levees and erosion-deposition waves. This thesis proposes a new non-monotonic friction law for granular materials, consisting of static, intermediate and dynamic friction regimes, that when combined with a depth-averaged avalanche model can capture all the hysteretic phenomena observed as well as predicting the correct deposit depths left behind by steady uniform flows. Retrogressive failures can be observed in small-scale dry granular flow experiments by creating a static layer of thickness hstop(ζ), which due to frictional hysteresis can remain static when inclined to a steeper angle. If the increase in angle is small, a perturbation to the layer results in only a downhill propagating avalanche, but if the increase in angle is large enough an additional upward retrogressive failure is observed. These retrogressive failure experiments give indirect measurements of the functional form of the inherently unstable intermediate friction regime. This thesis shows that a simple depth-averaged avalanche model combined with the hysteretic non-monotonic friction law proposed here is sufficient to capture the observed planar retrogressive failures. An investigation into the stability of the downstream flow produced by retrogressive failures provides further constraints on the functional form of the friction law. Advisors/Committee Members: JOHNSON, CHRISTOPHER CG, Gray, Nico, Johnson, Christopher.

Subjects/Keywords: Geophysical and geological flows; Granular flow; Shallow water flows; Waves/free-surface flows

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APA (6^th Edition):

Russell, A. S. (2019). Frictional Hysteresis in Granular Avalanches. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322853

Chicago Manual of Style (16^th Edition):

Russell, Aaron Stephen. “Frictional Hysteresis in Granular Avalanches.” 2019. Doctoral Dissertation, University of Manchester. Accessed January 28, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322853.

MLA Handbook (7^th Edition):

Russell, Aaron Stephen. “Frictional Hysteresis in Granular Avalanches.” 2019. Web. 28 Jan 2021.

Vancouver:

Russell AS. Frictional Hysteresis in Granular Avalanches. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Jan 28]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322853.

Council of Science Editors:

Russell AS. Frictional Hysteresis in Granular Avalanches. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322853

Delft University of Technology

9. Krishnan, Vinayak (author). A novel technique for interface reconstruction in transparent media.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:eeb96c4a-2f9b-4deb-8b75-cac2d3626717

►

A novel technique for measuring capillary/gravity waves travelling on air/water interfaces is investigated. The main motivation is to measure the free surface deformations of an… (more)

▼

A novel technique for measuring capillary/gravity waves travelling on air/water interfaces is investigated. The main motivation is to measure the free surface deformations of an air cavity used for air lubrication of ship hulls. Due to limitations in the available techniques, two novel methods are proposed, out of which the Stereo Particle Image Velocimetry synthetic Schlieren (Stereo-PIV-SS) technique is found to be more promising. This technique uses the input of random dot pattern images captured with and without an interface by two cameras mounted in a Stereo configuration. These images are processed to generate "pseudo" particle motion vectors using a Stereo-PIV code. An analytical study is conducted to find a simple linear relation between the pseudo vectors and interface height. Two sets of experiments are conducted to test this technique. One with defined transparent solid Plexiglas and glass profiles and another on small amplitude and slope water waves. For the experiments on water waves, the Free Surface Synthetic Schlieren (FS-SS) technique is used as validation data. In addition to experiments, a synthetic image reconstruction study is conducted to test the quality of the images generated by an in-house code. The investigation reveals that the Stereo-PIV-SS technique is capable of capturing the flat interface height with sub millimeter precision for all interface heights tested in the range of 5 to 60 mm. Nevertheless, the technique can capture a wave profile with sub millimeter precision only for a limited range of wave parameters. The exact limits can only be defined by understanding more about the interplay of various wave parameters, which include the wave orientation, influencing the reconstruction. However, this technique can capture the profiles of waves having wavelength of the order of 1 cm and amplitude of the order of 1 mm, without requiring information about the mean interface height. Moreover, it is low cost, easy to use and apply since it requires only a standard PIV setting. The first attempt to study this new technique has been promising and it can be applied to specified wave regimes. The method can be developed further by understanding how to remove the effect of wave orientation on the reconstruction and including other wave parameters in the interface height correlation.

Mechanical Engineering

Advisors/Committee Members: Westerweel, Jerry (mentor), Charruault, Florian (mentor), Wellens, P.R. (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: free surface measurement; Interface Reconstruction; stereo camera; PIV; Synthetic Schlieren; water waves

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Krishnan, V. (. (2018). A novel technique for interface reconstruction in transparent media. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:eeb96c4a-2f9b-4deb-8b75-cac2d3626717

Chicago Manual of Style (16^th Edition):

Krishnan, Vinayak (author). “A novel technique for interface reconstruction in transparent media.” 2018. Masters Thesis, Delft University of Technology. Accessed January 28, 2021. http://resolver.tudelft.nl/uuid:eeb96c4a-2f9b-4deb-8b75-cac2d3626717.

MLA Handbook (7^th Edition):

Krishnan, Vinayak (author). “A novel technique for interface reconstruction in transparent media.” 2018. Web. 28 Jan 2021.

Vancouver:

Krishnan V(. A novel technique for interface reconstruction in transparent media. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Jan 28]. Available from: http://resolver.tudelft.nl/uuid:eeb96c4a-2f9b-4deb-8b75-cac2d3626717.

Council of Science Editors:

Krishnan V(. A novel technique for interface reconstruction in transparent media. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:eeb96c4a-2f9b-4deb-8b75-cac2d3626717

University of Maryland

10. Washuta, Nathan John. Air Entrainment in the Turbulent Ship Hull Boundary Layer.

Degree: Mechanical Engineering, 2016, University of Maryland

URL: http://hdl.handle.net/1903/18640

► Turbulent fluctuations in the vicinity of the water free surface along a flat, vertically oriented surface-piercing plate are studied experimentally using a laboratory-scale experiment. In… (more)

Subjects/Keywords: Mechanical engineering; Naval engineering; Air Entrainment; Boundary Layer; Fluid Mechanics; Free Surface Waves; Hydrodynamics; Turbulence

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Washuta, N. J. (2016). Air Entrainment in the Turbulent Ship Hull Boundary Layer. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/18640

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Washuta, Nathan John. “Air Entrainment in the Turbulent Ship Hull Boundary Layer.” 2016. Thesis, University of Maryland. Accessed January 28, 2021. http://hdl.handle.net/1903/18640.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Washuta, Nathan John. “Air Entrainment in the Turbulent Ship Hull Boundary Layer.” 2016. Web. 28 Jan 2021.

Vancouver:

Washuta NJ. Air Entrainment in the Turbulent Ship Hull Boundary Layer. [Internet] [Thesis]. University of Maryland; 2016. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/1903/18640.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Washuta NJ. Air Entrainment in the Turbulent Ship Hull Boundary Layer. [Thesis]. University of Maryland; 2016. Available from: http://hdl.handle.net/1903/18640

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

11. Russell, Aaron. Frictional hysteresis in granular avalanches.

Degree: PhD, 2020, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/frictional-hysteresis-in-granular-avalanches(49df39aa-0a52-4f7e-b2b5-a3d7d9010b49).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799463

► Geophysical mass flows often occur on inclines covered by a static layer of erodible granular material, which once disturbed initiates a flow downslope that grows… (more)

▼ Geophysical mass flows often occur on inclines covered by a static layer of erodible granular material, which once disturbed initiates a flow downslope that grows in size as it erodes additional material, posing a hazard to the local population. If the slope is sufficiently steep, material upslope of the disturbance can also be eroded via an upslope-propagating erosion wave, or retrogressive failure, which increases the volume of the flow, posing an increased hazard. This thesis aims to gain an insight into this complex phenomenon using a combination of continuum models, small-scale laboratory experiments and numerical simulations. Shallow dry granular flows over a rough plane inclined at an angle ζ to the horizontal exhibit a wide range of hysteretic behaviour, the simplest of which is that when a steady uniform granular flow is brought to rest it leaves a deposit of thickness hstop(ζ), but this layer will not start to flow spontaneously unless it is inclined to a greater angle ζstart. This frictional hysteresis is directly responsible for flows with co-existing regions of solid-like and fluid-like behaviour such as retrogressive failures, self channelised flows with static levees and erosion-deposition waves. This thesis proposes a new non-monotonic friction law for granular materials, consisting of static, intermediate and dynamic friction regimes, that when combined with a depth-averaged avalanche model can capture all the hysteretic phenomena observed as well as predicting the correct deposit depths left behind by steady uniform flows. Retrogressive failures can be observed in small-scale dry granular flow experiments by creating a static layer of thickness hstop(ζ), which due to frictional hysteresis can remain static when inclined to a steeper angle. If the increase in angle is small, a perturbation to the layer results in only a downhill propagating avalanche, but if the increase in angle is large enough an additional upward retrogressive failure is observed. These retrogressive failure experiments give indirect measurements of the functional form of the inherently unstable intermediate friction regime. This thesis shows that a simple depth-averaged avalanche model combined with the hysteretic non-monotonic friction law proposed here is sufficient to capture the observed planar retrogressive failures. An investigation into the stability of the downstream flow produced by retrogressive failures provides further constraints on the functional form of the friction law.

Subjects/Keywords: Shallow water flows; Waves/free-surface flows; Geophysical and geological flows; Granular flow

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Russell, A. (2020). Frictional hysteresis in granular avalanches. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/frictional-hysteresis-in-granular-avalanches(49df39aa-0a52-4f7e-b2b5-a3d7d9010b49).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799463

Chicago Manual of Style (16^th Edition):

Russell, Aaron. “Frictional hysteresis in granular avalanches.” 2020. Doctoral Dissertation, University of Manchester. Accessed January 28, 2021. https://www.research.manchester.ac.uk/portal/en/theses/frictional-hysteresis-in-granular-avalanches(49df39aa-0a52-4f7e-b2b5-a3d7d9010b49).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799463.

MLA Handbook (7^th Edition):

Russell, Aaron. “Frictional hysteresis in granular avalanches.” 2020. Web. 28 Jan 2021.

Vancouver:

Russell A. Frictional hysteresis in granular avalanches. [Internet] [Doctoral dissertation]. University of Manchester; 2020. [cited 2021 Jan 28]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/frictional-hysteresis-in-granular-avalanches(49df39aa-0a52-4f7e-b2b5-a3d7d9010b49).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799463.

Council of Science Editors:

Russell A. Frictional hysteresis in granular avalanches. [Doctoral Dissertation]. University of Manchester; 2020. Available from: https://www.research.manchester.ac.uk/portal/en/theses/frictional-hysteresis-in-granular-avalanches(49df39aa-0a52-4f7e-b2b5-a3d7d9010b49).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.799463

Delft University of Technology

12. Cardinale, Lorenzo (author). Experimental Measurements of Wave Impacts in a Breaking Dam Flow: An Application of Computer Vision for Quantitative Reconstruction of the Free Surface in Breaking Waves.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:46aa2f04-b3d7-4559-b33d-1e00724a3095

► Breaking water waves still represent a very active research area, as they are involved in a broad spectrum of situations ranging from safety at sea… (more)

▼ Breaking water waves still represent a very active research area, as they are involved in a broad spectrum of situations ranging from safety at sea to climate change. The detailed knowledge of the location of the free surface in case of breaking waves or wave impacts could prevent structural damages, increase the efficiency of ship hulls and improve the understanding of gas exchanges between the ocean and the atmosphere. Several state-of-the-art numerical and experimental studies rely on qualitative or intrusive, punctual evaluation of the free surface location. Agreement is found in the relevant literature regarding the need for alternative, quantitative methods in free surface measurements. With the intention of filling this gap, the goal of this thesis consists in the dense, two- and three-dimensional, experimental measurement and reconstruction of the free surface during a large-scale breaking dam flow impact with a vertical wall. The breaking wave event is recreated in a purposely designed acrylic 821 x 130 x 280 mm tank with a sliding gate system and recorded in multiple locations by a pair of identical and synchronized sensors in stereo configuration, and an additional side camera. The experimental campaign of this project consists of 71 runs in which different aspects of the breaking dam event are recorded and different initial conditions and fluid properties are tested. A repeatability analysis of the main flow structures is carried out successfully. A preliminary numerical study supports the comparison between the results obtained with the present setup and data taken from the literature. All the cameras are calibrated with standard procedures and sub-pixel accuracy in the root-mean-square directional reprojection error is achieved. Computer vision techniques are adopted for the quantitative measurements. The two-dimensional free surface profile is obtained applying a combination of motion saliency and contour detection on the frames extracted from the side camera's recordings. The dense point clouds representing the three-dimensional free surface in the impact region are reconstructed from the stereo pairs in the common metric reference system using WASS, an open-source stereo processing pipeline. Dense and quantitative data regarding the location of the free surface in space and time is successfully obtained. Agreement is found comparing the 2D and 3D experimental measurements. Furthermore, the numerical method ComFLOW is used for the numerical simulation of the same breaking dam flow and is validated with the experimental results obtained in this project. The numerical and experimental results agree overall, though differences can be observed in the shape of the free surface during the breaking of the impact wave and the consequent formation of the secondary wave. Additionally, good agreement is found comparing the present results with punctual (numerical and experimental) free surface measurements taken from the relevant literature. The results obtained are unique as similar continuous, quantitative,… Advisors/Committee Members: Wellens, P.R. (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Free Surface; Measurement; Experimental; Numerical; 2D; 3D; Breaking Dam; Breaking waves; Computer Vision

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cardinale, L. (. (2020). Experimental Measurements of Wave Impacts in a Breaking Dam Flow: An Application of Computer Vision for Quantitative Reconstruction of the Free Surface in Breaking Waves. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:46aa2f04-b3d7-4559-b33d-1e00724a3095

Chicago Manual of Style (16^th Edition):

Cardinale, Lorenzo (author). “Experimental Measurements of Wave Impacts in a Breaking Dam Flow: An Application of Computer Vision for Quantitative Reconstruction of the Free Surface in Breaking Waves.” 2020. Masters Thesis, Delft University of Technology. Accessed January 28, 2021. http://resolver.tudelft.nl/uuid:46aa2f04-b3d7-4559-b33d-1e00724a3095.

MLA Handbook (7^th Edition):

Cardinale, Lorenzo (author). “Experimental Measurements of Wave Impacts in a Breaking Dam Flow: An Application of Computer Vision for Quantitative Reconstruction of the Free Surface in Breaking Waves.” 2020. Web. 28 Jan 2021.

Vancouver:

Cardinale L(. Experimental Measurements of Wave Impacts in a Breaking Dam Flow: An Application of Computer Vision for Quantitative Reconstruction of the Free Surface in Breaking Waves. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 28]. Available from: http://resolver.tudelft.nl/uuid:46aa2f04-b3d7-4559-b33d-1e00724a3095.

Council of Science Editors:

Cardinale L(. Experimental Measurements of Wave Impacts in a Breaking Dam Flow: An Application of Computer Vision for Quantitative Reconstruction of the Free Surface in Breaking Waves. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:46aa2f04-b3d7-4559-b33d-1e00724a3095

University of California – Irvine

13. Adas, Enver. Mode-Free Radiating Electromagnetic Bandgap Materials and Their Applications to Microstrip Phased Arrays.

Degree: Electrical and Computer Engineering, 2016, University of California – Irvine

URL: http://www.escholarship.org/uc/item/9nc746wn

► In addition to radiation, microstrip phased arrays excite substrate waves. These substrate waves are not desired since they keep energy, in the substrate, that is… (more)

▼ In addition to radiation, microstrip phased arrays excite substrate waves. These substrate waves are not desired since they keep energy, in the substrate, that is supposed to be radiated. Thus, array elements couple to each other through the substrate waves, and eventually radiation performance of the array degrades. Depending on the elements' excitation phase, or along certain radiation directions, almost all of the power at the array input couples to the substrate waves and radiating array fails to function as a radiator, instead it behaves as a guiding structure; this phenomenon is known as scan blindness, and it must be solved for an array to function properly. Electromagnetic bandgap (EBG) materials are engineered composite materials and capable to forbid wave propagation at frequencies within their bandgap. This thesis is focused on the integration of EBG materials and microstrip phased arrays. To be more specific, a multifunctional structure, which can be considered as a bandgap material, an antenna element, or a phased array consisted of the elements of the proposed structure, has been designed, fabricated, and measured. Numerical eigenmode and two port transmission methods are used for the bandgap investigation. Radiation properties of the structure has been improved using an impedance matching network. Scan analyses of both infinite and finite arrays have been studied. A prototype of 3 elements linear phased array of the proposed multifunctional structure has been fabricated and its active element pattern has been measured.The proposed multifunctional bandgap-antenna structure suppresses both bound and radiating substrate waves. Therefore, it provides complete elimination of scan blindness along all directions. In addition, unit element of the multifunctional structure has similar radiation characteristics, such as radiation pattern, gain, and polarization, as a conventional microstrip antenna; whereas, its scan behavior is the key achievement over the conventional microstrip arrays. Different from conventional arrays, this structure does not support any mode propagating along the lateral directions in the array structure; therefore, power entering to the array structure will radiate to free space.

Subjects/Keywords: Electrical engineering; Electromagnetics; Electromagnetic Bandgap; leaky waves; microstrip phased arrays; mode-free; scan blindness; Surface waves

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adas, E. (2016). Mode-Free Radiating Electromagnetic Bandgap Materials and Their Applications to Microstrip Phased Arrays. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/9nc746wn

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Adas, Enver. “Mode-Free Radiating Electromagnetic Bandgap Materials and Their Applications to Microstrip Phased Arrays.” 2016. Thesis, University of California – Irvine. Accessed January 28, 2021. http://www.escholarship.org/uc/item/9nc746wn.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Adas, Enver. “Mode-Free Radiating Electromagnetic Bandgap Materials and Their Applications to Microstrip Phased Arrays.” 2016. Web. 28 Jan 2021.

Vancouver:

Adas E. Mode-Free Radiating Electromagnetic Bandgap Materials and Their Applications to Microstrip Phased Arrays. [Internet] [Thesis]. University of California – Irvine; 2016. [cited 2021 Jan 28]. Available from: http://www.escholarship.org/uc/item/9nc746wn.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Adas E. Mode-Free Radiating Electromagnetic Bandgap Materials and Their Applications to Microstrip Phased Arrays. [Thesis]. University of California – Irvine; 2016. Available from: http://www.escholarship.org/uc/item/9nc746wn

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. Damarnegara, Anak. Scour at the foot of seawalls : L'affouillement au pied des digues.

Degree: Docteur es, Mécanique des fluides, 2019, Lyon

URL: http://www.theses.fr/2019LYSEC008

► L'affouillement au pied des digues est l'un des principaux facteurs de l’endommagement structurel des digues, impliqué dans 12% des cas documentés. Pour les applications pratiques,… (more)

▼ L'affouillement au pied des digues est l'un des principaux facteurs de l’endommagement structurel des digues, impliqué dans 12% des cas documentés. Pour les applications pratiques, l'affouillement au pied des digues est souvent modélisé avec une approche empirique simple qui a ses limites. Bien que des observations sur le terrain et des travaux expérimentaux soient utiles, il existe des limites dans l'approche. La pertinence des expériences en laboratoire est limitée par des problèmes de similitude et les expériences en vraie grandeur coûtent cher, et ne permettent pas une maîtrise des conditions expérimentales. Les simulations numériques nous offrent une alternative intéressante mais posent aussi quelques défis. La première difficulté est la modélisation correcte de la dynamique de la surface libre, y compris le processus de déferlement de la vague. Le deuxième problème est la modélisation de l’érosion des sédiments du lit, et l’influence de l’évolution du profil du lit sur l’écoulement. Enfin, pour être utile, la méthode doit être robuste, ne nécessitant que des ressources de calcul raisonnables de calcul pour effectuer la simulation d’un domaine d’une taille pertinente.Cette thèse décrit le développement d’un modèle numérique intégré basé sur OpenFOAM – une plate-forme CFD open source – qui comprend la dynamique de surface libre, le transport des sédiments et le processus de déformation du lit. La dynamique de surface libre est modélisée à l'aide de la méthode Volume of Fluid (VOF) avec des zones de relaxation pour la génération et l’absorption de la houle. Le processus de transport des sédiments est modélisé avec un transport par charriage et un transport des sédiments en suspension et l’échange avec le lit est calculé avec la méthode des Surfaces Finies. La déformation du lit est calculée avec l'équation de continuité des sédiments, et le maillage est déformé pour tenir compte du changement de lit.Plusieurs essais d'étalonnage ont été effectués pour caractériser les capacités du modèle. Premièrement, l’influence de la résolution spatiale et des schémas numériques sur la propagation de la houle ont été étudiés. Puis, plusieurs méthodes pour éliminer la réflexion de la houle ont été implémentées et comparées. La dérive de Stokes dans un canal fermé a été calculée et comparée avec les résultats théoriques et expérimentaux. Il est montré que le modèle surestime la dérive de Stokes près de la surface, parce que la pression à la surface libre n’est pas calculée correctement, et ceci induit une vitesse négative trop importante à l’intérieure du fluide. Quatrièmement, le calcul de la contrainte de cisaillement du lit a été testé avec le cas d’une couche limite oscillatoire. Deux méthodes pour le calcul de la contrainte de cisaillement au lit ont été testées avec différentes résolutions spatiales. Enfin, tous ces éléments ont été testés ensemble, dans la simulation d’une rupture de barrage sur fond mobile, avec comparaison des résultats avec une expérience en laboratoire. Le transport solide est créé principalement par… Advisors/Committee Members: Perkins, Richard (thesis director), Vincens, Eric (thesis director).

Subjects/Keywords: Digues; Vagues; Affouillement; Écoulement à surface libre; Transport de sédiments; Seawalls; Waves; Scour; Free-surface flow; Sediment transport

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Damarnegara, A. (2019). Scour at the foot of seawalls : L'affouillement au pied des digues. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2019LYSEC008

Chicago Manual of Style (16^th Edition):

Damarnegara, Anak. “Scour at the foot of seawalls : L'affouillement au pied des digues.” 2019. Doctoral Dissertation, Lyon. Accessed January 28, 2021. http://www.theses.fr/2019LYSEC008.

MLA Handbook (7^th Edition):

Damarnegara, Anak. “Scour at the foot of seawalls : L'affouillement au pied des digues.” 2019. Web. 28 Jan 2021.

Vancouver:

Damarnegara A. Scour at the foot of seawalls : L'affouillement au pied des digues. [Internet] [Doctoral dissertation]. Lyon; 2019. [cited 2021 Jan 28]. Available from: http://www.theses.fr/2019LYSEC008.

Council of Science Editors:

Damarnegara A. Scour at the foot of seawalls : L'affouillement au pied des digues. [Doctoral Dissertation]. Lyon; 2019. Available from: http://www.theses.fr/2019LYSEC008

University of Oxford

15. Lustri, Christopher Jessu. Exponential asymptotics in unsteady and three-dimensional flows.

Degree: PhD, 2013, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:9fe9517a-1733-496f-914b-b6739b2dce59 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581252

► The behaviour of free-surface gravity waves on small Froude number fluid flow past some obstacle cannot be determined using ordinary asymptotic power series methods, as… (more)

Subjects/Keywords: 519; Fluid mechanics (mathematics); Approximations and expansions; Partial differential equations; Exponential asymptotics; Stokes Phenomenon; Water waves; Free-surface flow

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lustri, C. J. (2013). Exponential asymptotics in unsteady and three-dimensional flows. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:9fe9517a-1733-496f-914b-b6739b2dce59 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581252

Chicago Manual of Style (16^th Edition):

Lustri, Christopher Jessu. “Exponential asymptotics in unsteady and three-dimensional flows.” 2013. Doctoral Dissertation, University of Oxford. Accessed January 28, 2021. http://ora.ox.ac.uk/objects/uuid:9fe9517a-1733-496f-914b-b6739b2dce59 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581252.

MLA Handbook (7^th Edition):

Lustri, Christopher Jessu. “Exponential asymptotics in unsteady and three-dimensional flows.” 2013. Web. 28 Jan 2021.

Vancouver:

Lustri CJ. Exponential asymptotics in unsteady and three-dimensional flows. [Internet] [Doctoral dissertation]. University of Oxford; 2013. [cited 2021 Jan 28]. Available from: http://ora.ox.ac.uk/objects/uuid:9fe9517a-1733-496f-914b-b6739b2dce59 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581252.

Council of Science Editors:

Lustri CJ. Exponential asymptotics in unsteady and three-dimensional flows. [Doctoral Dissertation]. University of Oxford; 2013. Available from: http://ora.ox.ac.uk/objects/uuid:9fe9517a-1733-496f-914b-b6739b2dce59 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.581252

Delft University of Technology

16. Sprong, Geert (author). An investigation of numerical analysis for modeling free-surface elevation from flow over a shallowly submerged 2D naca0012 hydrofoil.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:58d1eaa7-f37f-40d2-980f-cd98b6905795

► The bulbous bow is a common feature for large displacement vessels. The purpose of the bulbous bow is to reduce the bow wave, hereby making… (more)

▼ The bulbous bow is a common feature for large displacement vessels. The purpose of the bulbous bow is to reduce the bow wave, hereby making use of wave cancellation theory. The main drawback of these type of bows is that the drag reduction effect is only present for a limited range of sailing speeds. If the transit velocity is altered, the effect of the bulbous bow can even result in an increase of wave making drag. Due to this sensitivity to the sailing speed it is important to be able to predict the location of the waves generated by the protruding bulb. Computational fluid dynamics is gaining interest in commercial marine industries. The size and transit velocity at which the previously mentioned vessels that employ the protruding bulb operate, results in the common use of Reynolds averaged Navier Stokes (RANS) models. To investigate the accuracy of these RANS models, a 2D model is presented in this thesis. The bulbous bow is modeled as a shallowly submerged 2D naca0012 hydrofoil. The justification for this simplification is that the geometry and flow over a bulbous bow is too complex for the duration of this project. A submerged 2D hydrofoil can still capture the important flow dynamics for free-surface waves. In this thesis we focused on evaluating the accuracy of RANS models for simulating the wave dynamics that arise when a shallowly submerged 2D naca0012 hydrofoil moves through water. The main objective is to find which geometrical and fluid dynamic properties have an effect on the free surface wave profile. Apart from questioning if these properties have an influence on the wave profile, we also want to know how the wave profile changes by altering these properties. The interFoam package from OpenFoam was used for simulating the flow. InterFoam adopts the volume of fluid (VOF) approach proposed by Weller (Weller, 2008) for simulating multiphase flows. Turbulence modeling was done using the k-ωSST two equationmodel from Menter et al. (Menter, 1992). In 1983 Duncan and his colleagues published a paper on the free surface wave dynamics generated by a towed naca0012 hydrofoil (Duncan, 1983). The results from their experiments are used as a benchmark for the present study. From a single phase test we found that the experiments from Duncan where performed in the regime where transition of the boundary layer from laminar to turbulent is present. The presence of this transition is expected to be one of the reasons for the disagreement in literature on wave elevation, wavelength zero point crossings and lift and drag coefficients. It is shown that the relatively small gap between the basin floor and the hydrofoil of 0.86 chord lengths has a significant impact on the wave profile and the flow at the hydrofoil. Reynolds independence is found to be at Re ¸ 2•10⁵ for a towed hydrofoil submerged at h/c = 0.955 with the basin floor located 10 chord lengths below the hydrofoil. Below this value a reduction in Reynolds number results in an decrease of the wave amplitude and an increase in the wavelength. The… Advisors/Committee Members: Pourquie, Mathieu (mentor), Wellens, Peter (mentor), Westerweel, Jerry (graduation committee), de Koning Gans, Henk (graduation committee), van der Heiden, Kasper (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: fluid dynamics; hydrofoil; free-surface; multiphase; VOF; RANS; k-omega sst; javafoil; waves; breaking; non-breaking; OpenFOAM; interFoam; CFD; naca0012; transition

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APA (6^th Edition):

Sprong, G. (. (2019). An investigation of numerical analysis for modeling free-surface elevation from flow over a shallowly submerged 2D naca0012 hydrofoil. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:58d1eaa7-f37f-40d2-980f-cd98b6905795

Chicago Manual of Style (16^th Edition):

Sprong, Geert (author). “An investigation of numerical analysis for modeling free-surface elevation from flow over a shallowly submerged 2D naca0012 hydrofoil.” 2019. Masters Thesis, Delft University of Technology. Accessed January 28, 2021. http://resolver.tudelft.nl/uuid:58d1eaa7-f37f-40d2-980f-cd98b6905795.

MLA Handbook (7^th Edition):

Sprong, Geert (author). “An investigation of numerical analysis for modeling free-surface elevation from flow over a shallowly submerged 2D naca0012 hydrofoil.” 2019. Web. 28 Jan 2021.

Vancouver:

Sprong G(. An investigation of numerical analysis for modeling free-surface elevation from flow over a shallowly submerged 2D naca0012 hydrofoil. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 28]. Available from: http://resolver.tudelft.nl/uuid:58d1eaa7-f37f-40d2-980f-cd98b6905795.

Council of Science Editors:

Sprong G(. An investigation of numerical analysis for modeling free-surface elevation from flow over a shallowly submerged 2D naca0012 hydrofoil. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:58d1eaa7-f37f-40d2-980f-cd98b6905795

17. Schmedding, J.P.P. (author). Numerical harbour simulations with the model TRIWAQ - NH: With an emphasize on the present reflective properties.

Degree: 2011, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8820bbf6-6236-4978-9d59-9d822b0cfe7a

►

The focus is on the numerical flow model TRIWAQ. It is developed as a hydrostatic free-surface flow model, which is currently being used by the… (more)

▼

The focus is on the numerical flow model TRIWAQ. It is developed as a hydrostatic free-surface flow model, which is currently being used by the KNMI and Rijkswaterstaat for predictions of water levels in the North Sea and Dutch estuaries. TRIWAQ has successfully been extended to the realm of nonhydrostatic modeling, TRIWAQ-NH, this allows the use of full Navier-Stokes equations. It has been validated to perform well for multiple processes such as dispersion and propagation. The goal is to assess the ability of TRIWAQ-NH for harbour problems. This has not been attemptedbefore and poses a new challenge. Before an attempt is made to simulate a harbour, methods of imposing reflection are tested. For that matter, the thesis is split in two parts. The current use of the model TRIWAQ-NH holds practical restrictions to the implementation of open boundary conditions. When such a definition spawns a length of more than grid cell, it needs to comply with the edges of the grid. For instance, a boundary under the angle of 77 degrees is only possible by creation of a multitude of smaller open boundaries, leading to human error. The thesis results in two recommendations. The first part covered reflections, from that segment of the thesis, it is recommended to further explore the option of a stronger and smaller grid sized sponge layer with either an open or closed boundary condition for future development as method for partial reflections. The second recommendation is of a more practical nature and does not emerge in the work. However, the current tools available for non-hydrostatic modelling are insufficient. The smaller wave lengths require smaller time frames then the current tools provide, which is in the order of hours, days and months.

Environmental Fluid Dynamics

Hydraulic Engineering

Civil Engineering and Geosciences

Advisors/Committee Members: Stelling, G.S. (mentor), Huijsmans, R.H.M. (mentor), Van Vledder, G.P. (mentor), Zijlema, M. (mentor), De Schipper, M.A. (mentor).

Subjects/Keywords: non-hydrostatic; simulations; free-surface gravity waves; boundary conditions

…in its basin. On a smaller scale; consider a propagating free-surface wind wave, travelling… …predictions in harbours. It is a free-surface flow model, which is part of SIMONA (SImulatie… …the surface elevations at the lee side. Once waves are in the basin, they will meet quay… …consider hydrostatic flow, fundamental assumptions for a free-surface gravity wave (Battjes… …dependent on the gravitational acceleration , the distance between the free-surface and the…

10 more images…

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APA (6^th Edition):

Schmedding, J. P. P. (. (2011). Numerical harbour simulations with the model TRIWAQ - NH: With an emphasize on the present reflective properties. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8820bbf6-6236-4978-9d59-9d822b0cfe7a

Chicago Manual of Style (16^th Edition):

Schmedding, J P P (author). “Numerical harbour simulations with the model TRIWAQ - NH: With an emphasize on the present reflective properties.” 2011. Masters Thesis, Delft University of Technology. Accessed January 28, 2021. http://resolver.tudelft.nl/uuid:8820bbf6-6236-4978-9d59-9d822b0cfe7a.

MLA Handbook (7^th Edition):

Schmedding, J P P (author). “Numerical harbour simulations with the model TRIWAQ - NH: With an emphasize on the present reflective properties.” 2011. Web. 28 Jan 2021.

Vancouver:

Schmedding JPP(. Numerical harbour simulations with the model TRIWAQ - NH: With an emphasize on the present reflective properties. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Jan 28]. Available from: http://resolver.tudelft.nl/uuid:8820bbf6-6236-4978-9d59-9d822b0cfe7a.

Council of Science Editors:

Schmedding JPP(. Numerical harbour simulations with the model TRIWAQ - NH: With an emphasize on the present reflective properties. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:8820bbf6-6236-4978-9d59-9d822b0cfe7a

18. Xing, Guangchi. Effects of shallow density structure on the inversion for crustal shear wave speeds in surface wave tomography.

Degree: MS, Natural Sciences, 2016, Rice University

URL: http://hdl.handle.net/1911/95994

► Surface wave tomography routinely uses empirically scaled density model in the inversion of dispersion curves for shear wave speeds of the crust and uppermost mantle.… (more)

Subjects/Keywords: Interferometry; Surface waves and free oscillations; Seismic tomography; Computational seismology

…2 Traditional surface wave tomography based on seismic interferometry generally consists… …analysis has been widely employed in surface wave studies at various local or regional scales… …x28;Lin et al., 2007; Bensen et al., 2009; Yang et al., 2012). Surface wave phase or… …proportional to β for crustal and mantle rocks. Therefore most of the the surface wave studies only… …As mentioned above, traditional surface wave tomography requires intermediate steps of…

7 more images…

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APA (6^th Edition):

Xing, G. (2016). Effects of shallow density structure on the inversion for crustal shear wave speeds in surface wave tomography. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/95994

Chicago Manual of Style (16^th Edition):

Xing, Guangchi. “Effects of shallow density structure on the inversion for crustal shear wave speeds in surface wave tomography.” 2016. Masters Thesis, Rice University. Accessed January 28, 2021. http://hdl.handle.net/1911/95994.

MLA Handbook (7^th Edition):

Xing, Guangchi. “Effects of shallow density structure on the inversion for crustal shear wave speeds in surface wave tomography.” 2016. Web. 28 Jan 2021.

Vancouver:

Xing G. Effects of shallow density structure on the inversion for crustal shear wave speeds in surface wave tomography. [Internet] [Masters thesis]. Rice University; 2016. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/1911/95994.

Council of Science Editors:

Xing G. Effects of shallow density structure on the inversion for crustal shear wave speeds in surface wave tomography. [Masters Thesis]. Rice University; 2016. Available from: http://hdl.handle.net/1911/95994

Virginia Tech

19. Lowery, Kristen Mary. Dynamic Analysis of an Inflatable Dam Subjected to a Flood.

Degree: MS, Aerospace and Ocean Engineering, 1997, Virginia Tech

URL: http://hdl.handle.net/10919/35802

► A dynamic simulation of the response of an inflatable dam subjected to a flood was carried out to determine the survivability envelope of the dam… (more)

▼ A dynamic simulation of the response of an inflatable dam subjected to a flood was carried out to determine the survivability envelope of the dam where it can operate without rupture, or overflow. A fully nonlinear free-surface flow was applied in two dimensions using a mixed Eulerian-Lagrangian formulation. An ABAQUS finite element model was used to determine the dynamic structural response of the dam. The problem was solved in the time domain which allows the prediction of a number of transient phenomena such as the generation of upstream advancing waves, and dynamic structural collapse. Stresses in the dam material were monitored to determine when rupture occurs. An iterative study was performed to find the service envelope of the dam in terms of the internal pressure and the flood Froude number for two flood depths. It was found that the driving parameter governing failure of the dam was the internal pressure. If this pressure is too low, the dam overflows; if this pressure is too high, the dam ruptures. The fully nonlinear free-surface flow over a semi-circular bottom obstruction was studied numerically in two dimensions using a similar solution formulation as that used in the previous study. A parametric study was performed for a range of values of the depth-based Froude number up to 2.5 and non-dimensional obstacle heights up to 0.9. When wave breaking does not occur, three distinct flow regimes were identified: subcritical, transcritical and supercritical. When breaking occurs it may be of any type: spilling, plunging or surging. In addition, for values of the Froude number close to 1, the upstream solitary waves break. A systematic study was undertaken, to define the boundaries of each type of breaking and non-breaking pattern, and to determine the drag and lift coefficients, free surface profile characteristics and transient behavior. Advisors/Committee Members: Liapis, Stergios I. (committeechair), Neu, Wayne L. (committee member), Johnson, Eric R. (committee member), Plaut, Raymond H. (committee member).

Subjects/Keywords: ABAQUS; free surface flow; FEM; wave breaking; Inflatable dam; waves; flood; CFD

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APA (6^th Edition):

Lowery, K. M. (1997). Dynamic Analysis of an Inflatable Dam Subjected to a Flood. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/35802

Chicago Manual of Style (16^th Edition):

Lowery, Kristen Mary. “Dynamic Analysis of an Inflatable Dam Subjected to a Flood.” 1997. Masters Thesis, Virginia Tech. Accessed January 28, 2021. http://hdl.handle.net/10919/35802.

MLA Handbook (7^th Edition):

Lowery, Kristen Mary. “Dynamic Analysis of an Inflatable Dam Subjected to a Flood.” 1997. Web. 28 Jan 2021.

Vancouver:

Lowery KM. Dynamic Analysis of an Inflatable Dam Subjected to a Flood. [Internet] [Masters thesis]. Virginia Tech; 1997. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/10919/35802.

Council of Science Editors:

Lowery KM. Dynamic Analysis of an Inflatable Dam Subjected to a Flood. [Masters Thesis]. Virginia Tech; 1997. Available from: http://hdl.handle.net/10919/35802

Luleå University of Technology

20. Lindqvist, Sandra. An Experimental Study of the Vortical Flow Induced by a Free-surface Piercing Plate.

Degree: 2013, Luleå University of Technology

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46156

►

In this thesis the vortical flow induced by a free-surface piercing plate is investigated using several methods. The plate has a beveled edge and… (more)

Subjects/Keywords: Technology; Teknik; vortical flow; vertical plate; water channel; free surface; experimental; Froude number; Reynolds number; waves; recirculation; separation; reattachment; surface deformation; flow visualisation; particle image velocimetry; proper orthogonal decomposition; frequency; surface level; rotation; shear deformation; laser; hydrogen bubbles

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APA (6^th Edition):

Lindqvist, S. (2013). An Experimental Study of the Vortical Flow Induced by a Free-surface Piercing Plate. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46156

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lindqvist, Sandra. “An Experimental Study of the Vortical Flow Induced by a Free-surface Piercing Plate.” 2013. Thesis, Luleå University of Technology. Accessed January 28, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46156.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lindqvist, Sandra. “An Experimental Study of the Vortical Flow Induced by a Free-surface Piercing Plate.” 2013. Web. 28 Jan 2021.

Vancouver:

Lindqvist S. An Experimental Study of the Vortical Flow Induced by a Free-surface Piercing Plate. [Internet] [Thesis]. Luleå University of Technology; 2013. [cited 2021 Jan 28]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46156.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lindqvist S. An Experimental Study of the Vortical Flow Induced by a Free-surface Piercing Plate. [Thesis]. Luleå University of Technology; 2013. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46156

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Maryland

21. Diorio, James Daniel. Experimental Investigations of Capillary Effects on Nonlinear Free-Surface Waves.

Degree: Mechanical Engineering, 2010, University of Maryland

URL: http://hdl.handle.net/1903/10282

► This thesis presents the results of three experiments on various aspects of the effects of surface tension on nonlinear free-surface waves. The first two experiments… (more)

▼ This thesis presents the results of three experiments on various aspects of the effects of surface tension on nonlinear free-surface waves. The first two experiments focus on capillary effects on the breaking of short-wavelength gravity waves, a problem of interest in areas of physical oceanography and remote sensing. The third experiment is concerned with the bifurcation of solitary capillary-gravity waves, a problem that is relevant in the study of nonlinear, dispersive wave systems. In the first set of experiments, streamwise profile measurements were made of spilling breakers at the point of incipient breaking. Both wind-waves and mechanically generated waves were investigated in this study, with gravity wavelengths in the range of 10 – 120 cm. Although it has been previously argued that the crest shape is dependent only on the surface tension, the results reported herein are to the contrary as several geometrical parameters used to describe the crest change significantly with the wavelength. However, the non-dimensional crest shape is self-similar, with two-shape parameters that depend on a measure of the local wave slope. This self-similarity persists over the entire range of wavelengths and breaker conditions measured, indicating a universal behavior in the near-crest dynamics that is independent of the method used to generate the wave. The measured wave slope is found to be related to the wave growth rate and phase-speed prior to breaking, a result that contributes towards the development of a breaking criterion for unsteady capillary-gravity waves. The second set of experiments examines the cross-stream surface structure in the turbulent breaking zone generated by short-wavelength breakers. Waves in this study were generated using a mechanical wedge and ranged in wavelength from 80 – 120 cm. To isolate the effects of surface tension on the flow, the important experimental parameters were adjusted to produce Froude-scaled, dispersively-focused wave packets. The results show the development of ``quasi''-2D streamwise ripples along with smaller cross-stream ripples that grow as breaking develops and can become comparable in amplitude to the streamwise ripples for larger breakers. It is found that the amplitude of the cross-stream surface ripples scale as &lambda̅³, where &lambda̅ is the average wavelength of the wave packet. The cross-stream ripple activity appears to be highest in the ``troughs'' of the larger streamwise ripples, with the appearance of persistent ``scar''-like features. Based on these observations, a simple model for the coupling between the vorticity and capillary structure in the breaking zone is conjectured. The third set of experiments focuses on the generation of capillary-gravity waves by a pressure source moving near the minimum phase speed c_min. Near this minimum, nonlinear capillary-gravity solitary waves, or ``lumps'', have been shown to exist theoretically. We identify an abrupt transition to a wave-like state that features a localized solitary wave that… Advisors/Committee Members: Duncan, James H (advisor).

Subjects/Keywords: Physics, Fluid and Plasma; Engineering, Mechanical; Engineering, Marine and Ocean; Capillarity; Free surface waves; Solitary Waves; Wave Breaking

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Diorio, J. D. (2010). Experimental Investigations of Capillary Effects on Nonlinear Free-Surface Waves. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/10282

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Diorio, James Daniel. “Experimental Investigations of Capillary Effects on Nonlinear Free-Surface Waves.” 2010. Thesis, University of Maryland. Accessed January 28, 2021. http://hdl.handle.net/1903/10282.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Diorio, James Daniel. “Experimental Investigations of Capillary Effects on Nonlinear Free-Surface Waves.” 2010. Web. 28 Jan 2021.

Vancouver:

Diorio JD. Experimental Investigations of Capillary Effects on Nonlinear Free-Surface Waves. [Internet] [Thesis]. University of Maryland; 2010. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/1903/10282.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Diorio JD. Experimental Investigations of Capillary Effects on Nonlinear Free-Surface Waves. [Thesis]. University of Maryland; 2010. Available from: http://hdl.handle.net/1903/10282

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

22. Duz, B. Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086

► The PhD study focused on two topics. The first topic was energy dissipation in wave propagation. The wave dissipation can be caused by physical and/or… (more)

Subjects/Keywords: generating and absorbing boundary condition; volume of fluid method; wave damping; free surface modeling; free surface water waves; wave propagation; wave impact on structures

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APA (6^th Edition):

Duz, B. (2015). Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086

Chicago Manual of Style (16^th Edition):

Duz, B. “Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows.” 2015. Doctoral Dissertation, Delft University of Technology. Accessed January 28, 2021. http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086.

MLA Handbook (7^th Edition):

Duz, B. “Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows.” 2015. Web. 28 Jan 2021.

Vancouver:

Duz B. Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows. [Internet] [Doctoral dissertation]. Delft University of Technology; 2015. [cited 2021 Jan 28]. Available from: http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086.

Council of Science Editors:

Duz B. Wave Generation, Propagation and Absorption in CFD Simulations of Free Surface Flows. [Doctoral Dissertation]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; urn:NBN:nl:ui:24-uuid:e204277d-c334-49a2-8b2a-8a05cf603086 ; http://resolver.tudelft.nl/uuid:e204277d-c334-49a2-8b2a-8a05cf603086

23. Schweighofer, Juha. Investigation of Two-Dimensional Transom Waves Using Inviscid and Viscous Free-Surface Boundary Conditions at Model- and Full-Scale Ship Reynolds Numbers.

Degree: 2003, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2003/isbn9512266482/

►

Two-dimensional transom waves are computed using inviscid and viscous free-surface boundary conditions at model- and full-scale ship Reynolds numbers. The computations are carried out solving… (more)

Subjects/Keywords: FINFLO; transom waves; free-surface boundary conditions; Reynolds-averaged Navier-Stokes equations; Euler equations; full scale; scaling

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APA (6^th Edition):

Schweighofer, J. (2003). Investigation of Two-Dimensional Transom Waves Using Inviscid and Viscous Free-Surface Boundary Conditions at Model- and Full-Scale Ship Reynolds Numbers. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2003/isbn9512266482/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schweighofer, Juha. “Investigation of Two-Dimensional Transom Waves Using Inviscid and Viscous Free-Surface Boundary Conditions at Model- and Full-Scale Ship Reynolds Numbers.” 2003. Thesis, Helsinki University of Technology. Accessed January 28, 2021. http://lib.tkk.fi/Diss/2003/isbn9512266482/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schweighofer, Juha. “Investigation of Two-Dimensional Transom Waves Using Inviscid and Viscous Free-Surface Boundary Conditions at Model- and Full-Scale Ship Reynolds Numbers.” 2003. Web. 28 Jan 2021.

Vancouver:

Schweighofer J. Investigation of Two-Dimensional Transom Waves Using Inviscid and Viscous Free-Surface Boundary Conditions at Model- and Full-Scale Ship Reynolds Numbers. [Internet] [Thesis]. Helsinki University of Technology; 2003. [cited 2021 Jan 28]. Available from: http://lib.tkk.fi/Diss/2003/isbn9512266482/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schweighofer J. Investigation of Two-Dimensional Transom Waves Using Inviscid and Viscous Free-Surface Boundary Conditions at Model- and Full-Scale Ship Reynolds Numbers. [Thesis]. Helsinki University of Technology; 2003. Available from: http://lib.tkk.fi/Diss/2003/isbn9512266482/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Papoutsellis, Christos. Nonlinear water waves over varying bathymetry: theoretical and numerical study using variational methods.

Degree: 2016, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/39679

► The understanding of the motion of water waves is of fundamental importance for manyapplications related to disciplines such Naval and Marine Hydrodynamics, Coastaland Environmental Engineering,… (more)

▼ The understanding of the motion of water waves is of fundamental importance for manyapplications related to disciplines such Naval and Marine Hydrodynamics, Coastaland Environmental Engineering, and Oceanography. Even under the simplifyingassumptions that fluid is ideal and the flow irrotational, the complete mathematicalformulation of the free-boundary problem of water waves is very complicated and itstheoretical and numerical study comprises a contemporary direction of research.In the first part of this thesis, a new system of two Hamiltonian equations is derived,governing the evolution of free-surface waves. This system is coupled with a time independent Coupled Mode System (CMS), called the substrate problem, that accountsfor the internal fluid kinematics. The derivation is based on the use of Luke’svariational principle in conjunction with an appropriate series representation of thevelocity potential. The critical feature of this approach, initiated in (Athanassoulis &Belibassakis 1999, 2000), is the use of an enhanced vertical modal expansion thatserves as an exact representation of the velocity potential in terms of horizontal modalamplitudes. Herein, we study further and justify this expansion. In particular, it isproved that under appropriate smoothness assumptions, the modal amplitudes exhibitrapid decay, ensuring that the infinite series can be termwise differentiated in the nonuniformfluid domain, including its physical boundaries. This justifies the variationalprocedure and proves that the resulting system, called Hamiltonian/Coupled-ModeSystem (HCMS), is an exact reformulation of the complete hydrodynamic problem,and therefore it is valid for fully nonlinear waves and significantly varying seabeds.In fact, it is a modal version of Zakharov/Craig-Sulem Hamiltonian formulation(Zakharov 1968, Craig & Sulem 1993) with a new, versatile and efficient representationof the Dirichlet to Neumann operator (DtN) operator, needed for the closure of thenon-local evolution equations. No smallness assumptions are made, that is, thepresent approach is a non-pertubative one. In HCMS, the DtN operator is definedin terms of one of the unknown modal amplitudes, namely, the free-surface modalamplitude. Its computation avoids the numerical solution of the Laplace equation inthe whole fluid domain, required in direct numerical methods, and the evaluationof higher-order horizontal derivatives, required in Boussinesq or other higher-orderpertubative methods. Instead, a system of horizontal second order partial differentialequations needs to be solved.In the second part of the thesis, our theoretical results are exploited for the numericalsolution of various nonlinear water wave problems. The backbone of our numericalmethod is the computation of the DtN operator through its modal characterizationwhich is achieved by a fourth-order finite-difference method. The accuracy andconvergence of the new characterization of the DtN operator is assessed in test casesof highly non-uniform domains and our theoretical findings concerning the…

Subjects/Keywords: Πλήρως μη-γραμμικά υδάτινα κύματα; Ελεύθερη επιφάνεια; Τελεστής Dirichlet to Neumann; Ανάπτυγμα ιδιοσυναρτήσεων; Αριθμητικό κυματικό μοντέλο; Αλληλεπίδραση κύματος-πυθμένα; Fully nonlinear water waves; Free surface; Dirichlet to Neumann operator; Eigenfunction expansion; Numerical wave model; Wave-bottom interaction

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APA (6^th Edition):

Papoutsellis, C. (2016). Nonlinear water waves over varying bathymetry: theoretical and numerical study using variational methods. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/39679

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Papoutsellis, Christos. “Nonlinear water waves over varying bathymetry: theoretical and numerical study using variational methods.” 2016. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed January 28, 2021. http://hdl.handle.net/10442/hedi/39679.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Papoutsellis, Christos. “Nonlinear water waves over varying bathymetry: theoretical and numerical study using variational methods.” 2016. Web. 28 Jan 2021.

Vancouver:

Papoutsellis C. Nonlinear water waves over varying bathymetry: theoretical and numerical study using variational methods. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2016. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/10442/hedi/39679.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Papoutsellis C. Nonlinear water waves over varying bathymetry: theoretical and numerical study using variational methods. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2016. Available from: http://hdl.handle.net/10442/hedi/39679

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Jennings, Geri Izbicki. Efficient Numerical Methods for Water Wave Propagation in Unbounded Domains.

Degree: PhD, Applied and Interdisciplinary Mathematics, 2012, University of Michigan

URL: http://hdl.handle.net/2027.42/91536

► In models of water waves, solutions are often sought on an unbounded domain. To generate computer simulations of such models, the finiteness of computer memory… (more)

▼ In models of water waves, solutions are often sought on an unbounded domain. To generate computer simulations of such models, the finiteness of computer memory demands that the domain must first be truncated to finite size. This is done by introducing an artificial boundary at an arbitrary distance from the region of interest. To complete the description of the computational problem, boundary conditions must be prescribed on the artificial boundary. In order to effectively model the unbounded domain, the boundary conditions should make the artificial boundary invisible to outgoing waves. This type of boundary condition is often called an "absorbing" boundary condition (ABC), and they are non-trivial to formulate. The focus of this work is the derivation and numerical implementation of ABCs for the water wave equation (WWE), which describes linearized two-dimensional incompressible, irrotational, inviscid free surface flow in deep water. We derive a one-way version of the water wave equation (OWWWE), which supports the propagation of water waves essentially only in the outgoing direction. The OWWWE takes the form of a fractional partial differential equation involving a nonlocal operator corresponding to half a derivative. Properties on the one way water wave equation are given. We develop a hierarchy of efficient numerical methods of increasing order for numerically simulating solutions to the OWWWEs. We view the OWWWE as a conservation law with linear nonlocal flux, and use solution cell averages to compute a conservative polynomial reconstruction of the solution in each computational cell. The flux at cell interfaces is computed by evaluating exactly the convolution integral of the approximating polynomial interpolants. Time integration uses Runge-Kutta schemes of matching order. We analyze the stability of the resulting schemes, study the convergence of the numerical solution, and present numerical results. For the absorbing boundary, we solve the WWE in a central domain but use the OWWWEs in layers near the artificial boundary. As waves leave the central domain, they are picked up by the OWWWEs and propagated outward toward the edge of the computational domain. Numerical results are presented. In addition, techniques for damping the equations are provided along with numerical examples. Advisors/Committee Members: Beck, Robert F. (committee member), Karni, Smadar (committee member), Nwogu, Okey (committee member), Rauch, Jeffrey B. (committee member), Smereka, Peter S. (committee member).

Subjects/Keywords: Absorbing Boundary; Free Surface Flow; Water Waves; Fractional Derivative; Numerical Methods; Mathematics; Science

…waves in free surface flow is to add a pressure disturbance at the surface, which creates a… …linearized two-dimensional incompressible, irrotational, inviscid free surface flow in deep water… …brief review of commonly used artificial boundary conditions (ABCs) for free surface… …conditions. 1.1.1 Sommerfeld radiation condition In the free surface flow literature… …2D free surface flow problems, but it assumes that the wave speed may be well approximated…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jennings, G. I. (2012). Efficient Numerical Methods for Water Wave Propagation in Unbounded Domains. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/91536

Chicago Manual of Style (16^th Edition):

Jennings, Geri Izbicki. “Efficient Numerical Methods for Water Wave Propagation in Unbounded Domains.” 2012. Doctoral Dissertation, University of Michigan. Accessed January 28, 2021. http://hdl.handle.net/2027.42/91536.

MLA Handbook (7^th Edition):

Jennings, Geri Izbicki. “Efficient Numerical Methods for Water Wave Propagation in Unbounded Domains.” 2012. Web. 28 Jan 2021.

Vancouver:

Jennings GI. Efficient Numerical Methods for Water Wave Propagation in Unbounded Domains. [Internet] [Doctoral dissertation]. University of Michigan; 2012. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/2027.42/91536.

Council of Science Editors:

Jennings GI. Efficient Numerical Methods for Water Wave Propagation in Unbounded Domains. [Doctoral Dissertation]. University of Michigan; 2012. Available from: http://hdl.handle.net/2027.42/91536

University of Oxford

26. Trinh, Philippe H. Exponential asymptotics and free-surface flows.

Degree: PhD, 2010, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:e87b1f22-2569-4c0f-86a2-5bde76f34953 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526426

► When traditional linearised theory is used to study free-surface flows past a surface-piercing object or over an obstruction in a stream, the geometry of the… (more)

Subjects/Keywords: 519; Fluid mechanics (mathematics); Ordinary differential equations; Approximations and expansions; Ocean and coastal engineering; exponential asymptotics; asymptotic approximations; free-surface flows; water waves; gravity-capillary waves; ship hydrodynamics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Trinh, P. H. (2010). Exponential asymptotics and free-surface flows. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:e87b1f22-2569-4c0f-86a2-5bde76f34953 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526426

Chicago Manual of Style (16^th Edition):

Trinh, Philippe H. “Exponential asymptotics and free-surface flows.” 2010. Doctoral Dissertation, University of Oxford. Accessed January 28, 2021. http://ora.ox.ac.uk/objects/uuid:e87b1f22-2569-4c0f-86a2-5bde76f34953 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526426.

MLA Handbook (7^th Edition):

Trinh, Philippe H. “Exponential asymptotics and free-surface flows.” 2010. Web. 28 Jan 2021.

Vancouver:

Trinh PH. Exponential asymptotics and free-surface flows. [Internet] [Doctoral dissertation]. University of Oxford; 2010. [cited 2021 Jan 28]. Available from: http://ora.ox.ac.uk/objects/uuid:e87b1f22-2569-4c0f-86a2-5bde76f34953 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526426.

Council of Science Editors:

Trinh PH. Exponential asymptotics and free-surface flows. [Doctoral Dissertation]. University of Oxford; 2010. Available from: http://ora.ox.ac.uk/objects/uuid:e87b1f22-2569-4c0f-86a2-5bde76f34953 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526426

Université Catholique de Louvain

27. d'Oreye de Lantremange, Nicolas. Inclinomètre à niveaux hydrostatiques de haute résolution en géophysique / High Resolution Water-Tube Tiltmeter in Geophysics.

Degree: 2003, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/5368

► Nous avons développé, et évalué en détail, un nouveau prototype d'inclinomètre longue base à niveaux hydrostatiques appelé " wth2o ". Ce système, aux principes particulièrement… (more)

▼ Nous avons développé, et évalué en détail, un nouveau prototype d'inclinomètre longue base à niveaux hydrostatiques appelé " wth2o ". Ce système, aux principes particulièrement simples grâce à l'absence de pièces mécaniques mobiles, présente une grande fiabilité et une excellente stabilité (dérive linéaire de 0.05 µrad par mois). Sa haute résolution jusque dans la gamme des ondes sismiques longues périodes (où, par exemple, la résolution est meilleure que 0.001 masec, soit 5. 10-12 rad), et son niveau de bruit très bas, ont permis d'obtenir des résultats d'analyses harmoniques de marées terrestres (5 ans d'enregistrements) en excellent accord avec les modèles, et dont les écarts quadratiques moyens sont les plus bas de toutes les mesures inclinométriques réalisées au Laboratoire de Géodynamique de Walferdange (Luxembourg). A titre d'exemple, l'amplitude de l'onde M2 est déterminée avec une incertitude de seulement 0.003 masec, tandis que sa phase est déterminée avec un EQM de 0.028°, ce qui correspond à une incertitude de seulement 3.3 secondes. Cet instrument permit également d'observer des phénomènes rarement mesurés avec ce type d'appareil, tel les modes sphéroïdaux et toroïdaux les plus graves des oscillations libres de la Terre excitées par le séisme du Dénali (Mw 7.9) en novembre 2002, ou les passages successifs des ondes de Love jusqu'à G7, correspondant à 3 révolutions de ces ondes de surface autour du globe. Il fut également possible de séparer pour la première fois dans une analyse harmonique de marée terrestre inclinométrique, les constituants des groupes ter- et quater-diurnes. Ces très petites ondes enregistrées sont vraisemblablement liées aux ondes de marées océaniques propres aux eaux peu profondes présentes en Mer du Nord. Les modèles théoriques détaillés de cet appareil (comprenant des composantes relatives à l'amortissement produit par l'écoulement des fluides entre les électrodes des capteurs capacitifs) ont permis de dériver les solutions des équations du mouvement en composante inclinométrique et accélérométrique. De ces solutions furent tirées les formes théoriques des fonctions de transfert de l'appareil. Ces fonctions de transferts furent comparées avec succès aux mesures expérimentales de la réponse en fréquence. Grâce aux formes analytiques des fonctions de transfert en composante inclinométrique et accélérométrique qui sont données dans le présent travail, il est possible de calculer les caractéristiques géométriques optimales pour la construction d'un prototype devant répondre aux besoins particuliers d'une nouvelle application. Une étude originale des effets de ménisques (déformations de l'interface des fluides au contact de la paroi solide des pots) a montré que, s'ils n'ont pas d'influence sur les mesures en mode différentiel, ils peuvent par contre introduire des erreurs de plusieurs pour-cent sur l'estimation de la sensibilité par déplacement d'une quantité de liquide supposée connue. Cette erreur, ne dépendant que des propriétés physico-chimiques des fluides et matériaux en… Advisors/Committee Members: UCL - SC/PHYS - Département de physique, Schayes, Guy, Bilham, Roger, Antoine, Jean-Pierre, van Ruymbeke, Michel, Zuern, Walter, Ducarme, Bernard, Melchior, paul.

Subjects/Keywords: Float-Less Water-Tube; Instrumentation; Géophysique; Geophysics; Instrumentation; Meniscus; Ménisque; Inclinomètre longue base; Calibration; Etalonnage; Fonction de transfert; Transfer Function; Earth tides; Marées terrestres; Oscillations libres; Shallow-; Free Oscillations; Modes toroidaux; Surface (Love) Waves; Toroidal Modes; Ondes de surface (de Love); Marées océaniques en eaux peu profondes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

d'Oreye de Lantremange, N. (2003). Inclinomètre à niveaux hydrostatiques de haute résolution en géophysique / High Resolution Water-Tube Tiltmeter in Geophysics. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/5368

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

d'Oreye de Lantremange, Nicolas. “Inclinomètre à niveaux hydrostatiques de haute résolution en géophysique / High Resolution Water-Tube Tiltmeter in Geophysics.” 2003. Thesis, Université Catholique de Louvain. Accessed January 28, 2021. http://hdl.handle.net/2078.1/5368.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

d'Oreye de Lantremange, Nicolas. “Inclinomètre à niveaux hydrostatiques de haute résolution en géophysique / High Resolution Water-Tube Tiltmeter in Geophysics.” 2003. Web. 28 Jan 2021.

Vancouver:

d'Oreye de Lantremange N. Inclinomètre à niveaux hydrostatiques de haute résolution en géophysique / High Resolution Water-Tube Tiltmeter in Geophysics. [Internet] [Thesis]. Université Catholique de Louvain; 2003. [cited 2021 Jan 28]. Available from: http://hdl.handle.net/2078.1/5368.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

d'Oreye de Lantremange N. Inclinomètre à niveaux hydrostatiques de haute résolution en géophysique / High Resolution Water-Tube Tiltmeter in Geophysics. [Thesis]. Université Catholique de Louvain; 2003. Available from: http://hdl.handle.net/2078.1/5368

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Baghalian, Amin. Detecting Structural Defects Using Novel Smart Sensory and Sensor-less Approaches.

Degree: PhD, Mechanical Engineering, 2017, Florida International University

URL: https://digitalcommons.fiu.edu/etd/3560 ; 10.25148/etd.FIDC004006 ; FIDC004006

► Monitoring the mechanical integrity of critical structures is extremely important, as mechanical defects can potentially have adverse impacts on their safe operability throughout their… (more)

▼ Monitoring the mechanical integrity of critical structures is extremely important, as mechanical defects can potentially have adverse impacts on their safe operability throughout their service life. Structural defects can be detected by using active structural health monitoring (SHM) approaches, in which a given structure is excited with harmonic mechanical waves generated by actuators. The response of the structure is then collected using sensor(s) and is analyzed for possible defects, with various active SHM approaches available for analyzing the response of a structure to single- or multi-frequency harmonic excitations. In order to identify the appropriate excitation frequency, however, the majority of such methods require a priori knowledge of the characteristics of the defects under consideration. This makes the whole enterprise of detecting structural defects logically circular, as there is usually limited a priori information about the characteristics and the locations of defects that are yet to be detected. Furthermore, the majority of SHM techniques rely on sensors for response collection, with the very same sensors also prone to structural damage. The Surface Response to Excitation (SuRE) method is a broadband frequency method that has high sensitivity to different types of defects, but it requires a baseline. In this study, initially, theoretical justification was provided for the validity of the SuRE method and it was implemented for detection of internal and external defects in pipes. Then, the Comprehensive Heterodyne Effect Based Inspection (CHEBI) method was developed based on the SuRE method to eliminate the need for any baseline. Unlike traditional approaches, the CHEBI method requires no a priori knowledge of defect characteristics for the selection of the excitation frequency. In addition, the proposed heterodyne effect-based approach constitutes the very first sensor-less smart monitoring technique, in which the emergence of mechanical defect(s) triggers an audible alarm in the structure with the defect. Finally, a novel compact phased array (CPA) method was developed for locating defects using only three transducers. The CPA approach provides an image of most probable defected areas in the structure in three steps. The techniques developed in this study were used to detect and/or locate different types of mechanical damages in structures with various geometries. Advisors/Committee Members: Ibrahim Nur Tansel, Cesar Levy, Dwayne McDaniel, Yiding Cao, Igor Tsukanov.

Subjects/Keywords: Structural Health Monitoring; SHM; Sensor-less SHM; SSHM; Sensor-free SHM; Heterodyning Effect; Guided Waves; Defect Detection; Loose Bolt Detection; Crack Detection; Beam Forming; Phased Array; Monitoring of Pipes; Nonlinear Guided Waves; Nonlinear Wave Modulation Spectroscopy; NWMS; Surface Response to Excitation; SuRE; Acoustics, Dynamics, and Controls; Electro-Mechanical Systems; Signal Processing

…propagation [32]. Bulk waves are generally produced by surface tapping. These waves have a… …cylindrical structures using guided waves. The Surface Response to Excitation (SuRE)… …to structural damage. The Surface Response to Excitation (SuRE) method is a broad… …11 2. Surface Response to Excitation Method (SuRE)… …82 5.2.1 Lamb waves…

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APA (6^th Edition):

Baghalian, A. (2017). Detecting Structural Defects Using Novel Smart Sensory and Sensor-less Approaches. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/3560 ; 10.25148/etd.FIDC004006 ; FIDC004006

Chicago Manual of Style (16^th Edition):

Baghalian, Amin. “Detecting Structural Defects Using Novel Smart Sensory and Sensor-less Approaches.” 2017. Doctoral Dissertation, Florida International University. Accessed January 28, 2021. https://digitalcommons.fiu.edu/etd/3560 ; 10.25148/etd.FIDC004006 ; FIDC004006.

MLA Handbook (7^th Edition):

Baghalian, Amin. “Detecting Structural Defects Using Novel Smart Sensory and Sensor-less Approaches.” 2017. Web. 28 Jan 2021.

Vancouver:

Baghalian A. Detecting Structural Defects Using Novel Smart Sensory and Sensor-less Approaches. [Internet] [Doctoral dissertation]. Florida International University; 2017. [cited 2021 Jan 28]. Available from: https://digitalcommons.fiu.edu/etd/3560 ; 10.25148/etd.FIDC004006 ; FIDC004006.

Council of Science Editors:

Baghalian A. Detecting Structural Defects Using Novel Smart Sensory and Sensor-less Approaches. [Doctoral Dissertation]. Florida International University; 2017. Available from: https://digitalcommons.fiu.edu/etd/3560 ; 10.25148/etd.FIDC004006 ; FIDC004006

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