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Dissertations / Theses on the topic 'Research Subject Categories – TECHNOLOGY – Engineering mechanics'

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Published: 6 September 2023

Last updated: 31 July 2025

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1

Majumder, Rudrashis. "Resource Allocation for Natural Disasters using a Game-theoretic Framework." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6001.

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The occurrence of a severe natural disaster causes loss of life and destruction of properties. The overall criticality of the disaster depends on the nature of the disaster and the physical characteristics of the affected locations. In the aftermath of a natural disaster, multiple emergencies often evolve at different geographical locations with casualties and infrastructure damage. In post-disaster scenarios, responsible authorities should initiate relevant disaster management activities to mitigate the devastating effects of natural disaster. Resource allocation is an integral part o

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2

Karmakar, Anindya. "A phenomenological one-dimensional model for elastic ribbons." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4787.

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Ribbons exhibit fascinating buckling-dominated behavior under mechanical loading because of a unique combination of geometric dimensions. The recent interest in examining engineering applications of ribbon-like structures underscores the need for dedicated structural mechanics models to predict their complex behavior. In this thesis, we deal with ribbons that have at unstressed con figurations. Due to their physical appearance, such ribbons are typically modeled either as rods with highly anisotropic cross-sections (width of the cross-section is much larger than the thickness) or narro

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3

Gowdham, Prabhakar P. G. "Interaction Design and Distraction Detection of Drivers in Automobiles." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4924.

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In recent times, usage of electronic devices inside cars while driving has increased due to the introduction of new technologies to keep drivers comfortable and entertained. Systems like satnav ease out the navigation by offering optimised traffic plans at times of complex traffic and road conditions. Though technologies like music, radio and phone facilitate onboard communication and entertainment, they have potential in distracting drivers. The interaction with such technologies while driving takes the attention of drivers away from driving. As distraction of drivers leads to car crashes and

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4

Gupta, Kishan Kumar. "Measuring Three-dimensional Deformations of Elastic Ribbons." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5586.

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Experimental techniques to measure and visualize kinematics in structural and solid mechanics range from humble strain gage rosettes to sophisticated digital image correlation methods. This thesis develops a stereo visionbased optical measurement technique and evaluates its efficacy for measuring three-dimensional elastic deformations of slender structures. Our motivation to develop the technique stems from the need to quantify/digitize the kinematics of slender elastic structures undergoing large displacements and rotations within the small strain regime. As devices composed of highly

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5

Anoop, A. M. "Structural acoustics of perforated panels." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4993.

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In this work, radiation and transmission of sound through flexible perforated panels set in infinite rigid baffles are investigated. The treatment is largely analytical using Fourier transforms and contour integrations. Numerical calculations are only used occasionally. The work is largely divided into three parts: the first part involves radiation and transmission studies using the one-way coupled formulation, the second part investigates the same problems using the two-way coupled (or the fully-coupled) formulation and the third part involves derivations of closed form expressions for the mo

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6

Siva, MS. "Integrated Relative Position and Attitude Control of Distributed Spacecraft Formation For High Resolution Imaging." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4184.

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One of the major challenges in space technology is to achieve high resolution imaging of the intended area on demand to meet civilian and military applications. Spacecraft formation flying with coordinated control of smaller satellites offers improvement in image resolution using distribution of payloads across the formation group. Quick revisit and stereo coverage, as well as provision of modularity and redundancy, are other benefits achieved by formation flying. The thesis addresses spacecraft formation flying with coordinated control of smaller satellites in realizing this high resolutio

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7

Pramanik, Santanu. "Experimental and Numerical Studies on Low Emission Syngas Combustion." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4791.

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The present study concerns experimental and numerical investigation of the combustion of low-calorific value syngas in an optically accessible reverse flow combustion chamber. Several modes of operation are investigated to identify the best strategy for stable operation with low emissions of NOx and CO. The first part of the study investigates the combustion dynamics in the chamber and establishes the range of parameters for stable operation using OH* chemiluminescence (5 kHz), noise (50 kHz), and exhaust emissions measurements (NOx and CO). The combustion dynamics have been investigated as a

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8

Abinesh, M. "Turbulence-Premixed Flame Interactions." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4660.

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The interaction between premixed flames and turbulence is an inherently non-linear phenomenon. Understanding such interactions has profound practical implications towards the development of better combustion devices and turbulent combustion models. To this end, three statistically planar, freely propagating, turbulent premixed lean H2-air flames with varying turbulence intensities are generated using Direct Numerical Simulations (DNS). A newly developed backward tracking technique is applied to identify the source locations of iso-scalar surfaces of the turbulent premixed flames. In this techn

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9

Ghosh, Prasenjit. "Discrete particulate description of elastic structures undergoing geometrically nonlinear deformation and dynamic particle interaction." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5765.

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The mechanical behaviour of deformable bodies in a particulate environment has been an area of increasing interest across a wide spectrum of systems and scale. A composite ensemble of deformable structures and discrete particles involves coupling of component responses, large displacements of structures, and multiple dynamic interactions that lead to inherent contact nonlinearity. To describe these structures and their interactions with particles, we apply a particle simulation approach based on the discrete element method (DEM). There exist alternative frameworks too such as continuum modelli

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10

Gnanendra, P. M. "Experimental Studies on Co-current downdraft Biomass Gasifier." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4188.

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The main theme of the work carried out and reported in this thesis is to understand the processes involved in a co-current downdraft biomass gasification reactor and to analyse the data obtained with an attempt to provide a consistent and rational scientific reasoning of the behaviour and processes studied. The work carried out largely comprises of experiments involving parametric and investigative studies on an experimental setup built specifically for this purpose. The background for this study is based on the IISc design for the biomass gasifier where the technology developed at CGPL, II

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11

Mitra, Abhijit. "Dynamics of Laminar Separation Bubbles on Low Reynolds Number Airfoils." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4991.

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This is a detailed study on the aerodynamics of low Reynolds number airfoils. E387 airfoil that comes under the category of trailing-edge stall is used extensively in this study. The reduction in lift due to low Reynolds number effects can be modeled by the so-called viscous decambering of airfoils. In particular, we show this viscous decambering effect can be subsumed in the zero-lift angle term. It is further demonstrated that leading-edge camber angle plays an important role in explaining the stall characteristics of different airfoils. An attempt has been made to heuristically illust

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12

Javvaji, Brahmanandam. "Plasmon Phonon Coupled Dynamics of Nanocrystalline Structures." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4185.

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This thesis is an attempt to understand the characteristics and responses of plasmon phonon coupled dynamics in nanocrystalline structures. An energy based Lagrangian formulation is developed with fundamental field quantities like displacement, charge, electric and magnetic field as variables. Governing differential equations of motion are derived from variational calculus. A new computational framework is implemented to solve for system degrees of freedom, which involve energy and force exchanges between atomic and continuum representation of the system. The developed simulation framework is

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13

Pothnis, Jayaram. "Electric Field-Guided Alignment of Carbon Nanotubes in Polymer Matrix Composites for Structural Applications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5115.

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Carbon nanotubes (CNTs) have been extensively researched for diverse applications in recent years. In the present work, the use of low frequency non-uniform alternating electric fields to manipulate the alignment behavior of CNTs in an epoxy matrix has been explored for use in structural applications. CNT alignment was accomplished based on the dielectrophoresis (DEP) principle. The alignment methodology was developed and CNT alignment effectiveness was assessed through in-situ current measurements and polarized Raman spectroscopy data in addition to optical microscopy. Electrical and mechanic

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14

More, Chaitali Pannalal. "Structural sensitivity of the precessing vortex core instability in swirled jets." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5581.

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This thesis performs an LES study of the flow through a swirling nozzle. The nozzle has one single stream with swirl being generated by vanes mounted on an axially aligned centrebody. The end face of the centrebody coincides with the nozzle exit. The nominal Reynolds number based on the jet diameter and bulk flow velocity is 82,000 and the swirl number is 0.8. Two simulations are performed at this condition for a nominal end face diameter, Dc = 10mm (LES85A) and Dc = 5mm (LES85B). An additional test case for an Re ∼ 50, 000(LES50) was performed to validate the LES method against experim

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15

Khivsara, Sagar D. "Development of Tubular Solar Receiver with Supercritical Carbon Dioxide as Working Fluid." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4907.

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Over the past decade, solar powered supercritical carbon dioxide (s-CO2) based Brayton cycle has been identified as a promising candidate due to its potentially high cycle efficiency (50%, for turbine inlet temperatures of ~ 1000 K). Materialization of this cycle requires development of solar receivers capable of heating s-CO2 by over 200 K, to a receiver outlet temperature of about 1000 K. Due to the extreme outlet conditions (~1000 K, 20 MPa), tubular solar receivers which typically employ panels consisting of metallic circular tubes for transfer of the incident concentrated solar radi

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16

Sharma, Deepan. "Steady Sedimentation of Particles in Long Vertical Tube and Effect of End Boundary Conditions on Convective Motion." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5637.

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Sedimentation – settling of particles in a fluid- is observed in nature like rain droplets and dust particles in the atmosphere, and in a variety of industrial processes, like to clarify liquid as well as separate particles of different size and density. The simplest system is the sedimentation of mono-disperse particles in a vast stationary fluid. The main parameters are Particle Reynolds Number (〖Re〗_p based on terminal velocity), ratio of particle density to fluid density (ρ_p/ρ_f ), particle volume fraction (φ), and container dimensions for experimental and numerical methods. Two main que

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17

Bhole, Krishnakant. "Comprehensive Study on Synthesis and Characterization of Nanocellulose Reinforced Green Composites." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6011.

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Environmental issues caused by the non-biodegradability of synthetic thermoplastics have increased interest in more environmentally friendly alternatives that should be derived from renewable resources. This work focuses on producing green composites and biofilms by synthesizing nanocellulose (NC) from readily available natural and renewable sources like cellulose. The term NC refers to cellulose that has been reduced to the nanoscale. NC is used to describe a variety of cellulose nanostructures, including Micro Crystal Cellulose (MCC), Cellulose Micro Fibrils (CMF), Cellulose nano

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18

Ranjan, B. S. C. "Development of Support for Assessment of Creativity, Novelty and Requirement Satisfaction in Designing." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4956.

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The topic of this research in this thesis is creativity assessment of solutions developed in the engineering design process as a means of aiding designers to focus their creative effort during the process. Both engineering design process and creative process are planned, and occur, together in practice. Engineering design is a complex process involving both problem finding and problem solving, broadly divided into four stages: task clarification, conceptual design, embodiment design and detailed design. Literature on design models, theories and approaches is studied to understand the nature o

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19

Yogeshwaran, G. "On Flow Physics of Spinning Samaras." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5332.

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A particular form of winged seed (samara) dispersal technique adopted by nature uses autorotative (unpowered rotation of the wing generating thrust force against gravity) descent; for eg. in Maple and Mahagony trees. This technique provides the lowest descent velocities among various seed dispersal techniques found in nature ensuring the safety of the delicate seeds. Bio-mimicked solutions to important engineering problems in aerospace as well as in disaster management - air dropping of life-saving packages during floods can be inspired from the samara. The samara is a complex structure

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20

Panthi, Niraj. "Shock Dynamics due to Downstream Pressure Perturbations: Idealization of Transonic Unstarted Cascade Flutter." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4723.

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Shock wave unsteadiness is an important phenomenon in high-speed aerodynamics. This phenomenon is observed in many locations of high-speed vehicles, such as supersonic inlets, ramjet engines, transonic airfoils, high-speed fans, and compressors. In supersonic inlets and ramjet engines, unsteady shock motions can lead to large undesirable local fluctuations in properties such as pressure and heat transfer rate, besides overall thrust fluctuations. Shock unsteadiness in transonic airfoils can induce structural vibrations known as buffeting, while in gas turbine fans/compressors, shock osci

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21

Paandey, Keshav. "Insights of Evaporation Dynamics of an Interacting Linear Array of Droplet System." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4462.

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Manipulation of an array of sessile droplets organized in an ordered structure turns out to be of immense consequence in a wide variety of applications ranging from photonics, near field imaging and inkjet printing on one hand to bio-molecular analysis and DNA sequencing on the other. While evaporation of a single isolated sessile droplet has been well studied, the collective evaporative dynamics of an ordered array of droplets on a solid substrate remains elusive. Physically, the closed region between the centre and side droplets in the ordered array reduces the mobility of the diffusing vapo

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22

Prabhu, Akhilesh. "Torque transport, mean velocity profiles and turbulent statistics of a wide-gap Taylor Couette flow." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4604.

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Wall-bounded turbulent flows that possess finite curvature of the mean flow streamlines are known to be starkly different from their plane counterparts. One of the primary distinguishing features of such flows is the existence of a distinct mechanism of instability (centrifugal instability) that is altogether absent in planar flows. This fact is seen to have deep consequences with regards to flow dynamics and coherent structures and begs further inquiry into the underlying physics. With this as the primary motivation, we have chosen a wide-gap Taylor-Couette (TC) configuration with rotating

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23

Dev, Narendra. "Interaction behavior and droplet characteristics of multi-injector sprays." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4483.

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The injector faceplate of a liquid propellant rocket engine is comprised of numerous single-element atomizers to inject propellants into the engine thrust chamber. The sprays from these single-element atomizers interact and mix, and then develop a combined spray. The present study investigates the characteristics of combined spray from a multi-injector assembly discharging three identical hollow cone swirl sprays arranged in an equilateral triangular configuration. The experiments are carried out in a spray test facility using water as the experimental liquid for different values of pressure d

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24

Mukherjee, Sushovan. "Phononic bandgap engineering in cellular periodic structures and mechanical metamaterials." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5285.

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A methodology has been developed for the computation of phononic band structure of cellular periodic structures, structures with spatially repetitive patterns, using Frequency domain Spectral Finite Element Method along with Bloch Theorem. Band structures depict the nature of wave propagation in periodic structures and are characterized by the presence of banded frequency zones where wave may or may not propagate. These zones are known as 'Pass Bands' and 'Stop Bands' respectively. Bloch theorem is conventionally used for such band structure computation in order to reduce computation of an inf

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25

Kumar, Arun. "Studies on modeling the mechanics of slender elastic ribbons." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5689.

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Ribbons are slender structures characterized by three disparate geometric dimensions: length >> width >> thickness. Such a dimensional disparity enables ribbons to bend, buckle, twist and crease response to simple loading conditions. Their nonlinear deformation behavior, once considered a hindrance, is now routinely exploited in engineering applications related to stretchable electronics and flexible robotics. Such applications demand a systematic understanding of the mechanics of elastic ribbons using experiments, modeling, and simulations. This thesis is a step in this direction. Experime

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26

Chatterjee, Aritra. "Role of Fiber Orientations in the Mechanobiology of Cells under Stretch." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5632.

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Fiber reinforcement plays an important role in the structure and function of biological materials. Soft connective tissues in human body like artery, heart tissues, skin etc. exhibit anisotropic material responses due to the orientation of fibers along specific directions. At a cellular level, stress fibers in the cytoskeleton play an important role in maintaining cellular shape and influence cell adhesion, migration, and contractility. Cells respond to changes in their mechanical milieu and drive biochemical processes which induce growth and remodeling of the underlying material properties. T

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27

Hebbale, Deepthi. "Prospects of Bioethanol from Estuarine Macroalgae." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/5017.

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Burgeoning dependence on fossil fuels for transport and industrial sectors has been posing challenges such as depletion of fossil fuel reserves, enhanced greenhouse gas (GHG) footprint, and imminent changes in the climate, etc. Fossil fuels are regarded as unsustainable and questionable from economic, ecology and environmental point of view. Therefore, the pursuit for an environmentally benign and sustainable source of energy started with the advent of oil crisis in 1970, major focus of energy policies shifted to biofuel production from renewable resources. Biofuels minimizes the fossil fuel b

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28

Geetha, Ganesh Kolappan. "Structural Health Monitoring with Laser Doppler Imaging of Ultrasonic Guided Waves." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4690.

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This thesis deals with ultrasonic guided wave based non-destructive inspection and health monitoring of aircraft structural components using a non-contact sensing scheme based on laser Doppler scanning imaging technique. Ultrasonic guided waves are elastic waves which travel relatively long distance and are guided by the geometry of thin structures with minimal loss in amplitude. Experiments are conducted using piezoelectric actuator and a 3D scanning Laser Doppler Vibrometer (LDV). The piezoelectric actuators bonded on the structure excite ultrasonic guided waves. The laser beam from the LDV

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29

Venkateswarlu, Nitish M. R. D. S. "Fate and Remediation of Ammonium-n In Pit Toilet Blackwater." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5002.

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Pit toilets satisfy the sanitation requirement in regions with no access to piped sewerage facilities. Black water discharged from pit toilets is a major source of groundwater pollution. The primary focus of the thesis is to understand the fate of ammonium-N in blackwater generated in pour flush pit toilets, in blackwater contaminated soils in vicinity of leach pits that are subject to moisture evaporation and lastly develop a methodology to reduce nitrate contamination of aquifers by blackwater released from leach pits of pour flush toilets. In the first part of the study, the characteristics

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30

Vedam, Narayani. "From Particles to People: Vicsek-Inspired Behavioural Modelling Frameworks." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5757.

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In this thesis, we develop different modelling frameworks to capture the processes of opinion formation and disease spread. The common theme binding them is a nearest-neighbour-based interaction rule; while the closeness of opinions fosters inter-personal interactions, physical proximity facilitates disease spread. Since the nearest-neighbour rules with dynamic local interactions have been shown to enable consensus about the heading of self-propelled particles in a non-equilibrium system, we adapt the Vicsek model. In the first part of the thesis, we discuss two modelling frameworks that are

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31

Bhat, Maanasa. "Experimental Investigation of Fuel Drop Impact on Unheated and Heated Solid." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4720.

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The modelling of spray-wall interaction encountered in engine combustors relies heavily on studies of single drop impact on heated solid surfaces. In the present thesis, the impact of a single fuel drop on a hot, smooth stainless-steel surface is experimentally examined using high speed visualization. Four different fuels of significantly varying physical properties (heptane, decane, Jet A-1 and diesel) are considered. The condition of impacting fuel drop, characterized in terms of Weber number (We), is varied in the range 27-903. The temperature of the solid surface (Ts) is varied in the rang

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32

Prasad, Akhilesh B. "Investigations on Impinging Shock Wave and Boundary Layer Interactions in Hypersonic Flow." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4792.

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Shock boundary layer interactions (SBLIs) rank among the most fundamental problems in high-speed aerodynamics and are a primary concern in hypersonic flows. Shocks at hypersonic speeds are typically strong enough to separate the boundary layer, which can lead to dramatic changes in the entire flowfield structure with the formation of strong vortices and complex shock patterns characteristic of the SBLI phenomenon. Their presence in the systems in which they occur results in large-scale unsteadiness and high aerodynamic heating loads which curtail the performance of these systems and in many ca

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33

Kuchana, Vinayender. "Design of Curved Aggressive Annular Diffusers." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5196.

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For economical air transportation, aero engines with lower specific fuel consumption, lower emissions and lower noise levels are required. To this end, the use of turbofan engine with high bypass ratio is an option. With the increase in bypass ratio of a turbofan engine, the flow path of the inter turbine duct (ITD) which connects the high pressure turbine and low pressure turbine, becomes more aggressive in terms of slope and curvature distribution. Further, ITD offer the potential advantage of reducing the flow coefficient (with the increased area ratio of the duct) in the following stages,

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34

Parambil, Nithin Kaliyath. "A Unified Framework For Micromechanical Damage Modeling In Laminated Polymer Matrix Composites." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5404.

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A unified numerical framework for progressive damage analysis in polymer matrix composite (PMC) laminates has been developed by explicitly accounting for damage progression at the micro-level. A three-dimensional repeating unit cell (3D-RUC) at the micro-scale considering plasticity-based matrix damage, maximum stress based fiber failure, and a traction separation based interface failure has been developed. Images of the micro-structure of unidirectional long fiber reinforced plastic (UD-FRP) laminates have been used to develop the random micro-structure for the 3D-RUC. Coupling of macr

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35

Reddy, Swathi S. R. "Efficient Finite Element-Based Approaches for Solving Potential Flow Problems in Fluids." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5915.

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For many years, fluid flows have been modeled, starting from basic potential flow equations to full Navier-Stokes equations. The complexity of the flow increases as viscous effects, boundary layer, and flow separation are included in the fluid flow problem. However, at the preliminary design level, a simple technique to solve fluid flow problems becomes necessary for the quick assessment of 2-D aerodynamic concepts. Conventional panel methods have been popular in solving potential flow problems due to their ease of implementation for simple geometries such as circular bodies, airfoils, and 3-D

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Gowtham, Srinivas R. B. "An advection velocity correction scheme for interface tracking using the level-set method." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5377.

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An advection velocity correction (AVC) scheme for interface tracking using the level-set method is presented in this thesis. The key idea is to apply a correction to the interface advection velocity at points adjacent to the zero level-set, so as to enforce the preservation of the signed distance function property at these points. As such, the AVC scheme eliminates the need for explicit sub-cell x approaches, as reinitialization at points adjacent to the zero level-set is not needed. This ap- proach of correcting the advection velocity eld near the interface and computing the signed d

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37

Murdande, Raghvendra Mratyunjay. "Design and Development of Force Sensor for measurement of Tactile Friction." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5615.

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The sense of touch, along with the other senses, decides the perception of world around us. We touch, grip, and wear various products in our day-to-day life, be it the constant interaction we have with our mobile phones, the interaction with various machinery at our workplace or the clothes we wear all the time. It is necessary to quantify these interactions between skin and the product surfaces to be able to design the products for comfortable and desirable experience. Coefficient of friction (CoF) can be a good indicator of frictional characteristics and touch-feel perception of a surface. F

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38

Venkitachalam, Narayan. "Spherical Indentation Response of Bulk and Thin Film Shape Memory Alloys." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5379.

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Shape memory alloys (SMAs) have the ability to recover large strains upon undergoing a thermomechanical cycle. In addition to being used as structural elements, they can be patterned as thin films which can be employed in MEMS devices where high activation force needs to be generated. SMAs typically exist in two phases, viz., a high-temperature austenite (A) and a low-temperature martensite (M) phase. This work is focused on the phenomenon of superelasticity, which occurs due to stress induced martensite phase transformation (SIMT) from the parent A-phase. While instrumented indentation is a u

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Simha, Ashutosh. "Global control of mechanics on Riemannian manifolds, and applications to under-actuated aerial vehicles." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4389.

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We consider the problem of designing trajectory tracking feedback control laws for La- grangian mechanical systems in a Riemannian geometric framework. Classical nonlinear control techniques that rely on Euclidean parameterizations of nonlinear confguration manifolds, severely restrict the region of operation of the system due to singularities of local coordinate charts. The primary focus of our study is to develop a generic, con- structive and intrinsic (coordinate independent) procedure for global control design such that the closed loop operational envelop is signifcantly enhanced. An

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Dey, Suvakash. "Mechanics of collective cell migration on substrates of different stiffness." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5645.

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Collective cell migration is characteristic in many physiological processes such as wound closure, morphogenesis, and cancer tumour metastasis. Experiments on cell monolayers demonstrated the formation of finger-like patterns that are guided by leader cells at their tips which help advance the edge during migrations. Recent studies also showed that the substrate stiffness was a critical factor in altering cell migrations on different substrates which were quantified based on areal expansion of the monolayer and peripheral speed of the cells in the edge. These differences correlated with the pr

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Kurade, Rajan Bharat. "Control of shock-induced vortex breakdown in Transonic regime on a slender delta wing body configuration using blowing." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5121.

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Modern high speed aircrafts feature highly swept and low aspect ratio wings, mainly to increase the critical Mach number and reduce the wave drag. A special case of swept wings is wings with triangular planform commonly known as delta wings. The delta wings provide advantageous aerodynamic characteristics such as small lift curve slope, non-linear lift and a higher stalling angle due to it’s ability to form two counter rotating leading edge vortices. These vortices are strong and are a source of high energy which enables higher suction on the lee-ward side of wing and results into an inc

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42

Sasidharan, Sayuj. "Studies on Pressurized Solar Thermal Receiver and Thermal Energy Storage System." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5658.

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High-efficiency power cycles for concentrating solar power (CSP) technology such as air or supercritical carbon-dioxide (s-CO2) based Brayton cycle require high-pressure high-temperature conditions at the gas turbine inlet. This requires heating of the heat transfer fluid (HTF) to those conditions (~3-35 bar, 900-1600 K for air and ~200 bar, 1000 K for s-CO2) using a solar thermal receiver. Thus, the design and analysis of the pressurized receiver system form an important part towards the development of such solarized power plants. A coupled optical and thermal model is developed for an

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Verma, Krishna Kamlesh. "Development of a wrought Mg‒7Sn‒3Zn alloy with improved strength and ductility." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4674.

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The current focus of research in Mg alloys is to develop wrought alloys suitable for the automotive industry. The challenges to be overcome are low strength, poor ductility, and high cost associated with wrought Mg‒based alloys. With this objective, wrought Mg‒7Sn‒3Zn (TZ73) alloy was developed in the present work, which does not contain expensive rare‒earth (RE) elements and has much higher strength than the most commonly used commercial AZ31 alloy, with a reasonable ductility. The alloy was prepared by squeeze casting, followed by homogenization at 300°C for 24 h to dissolve the low‒temperat

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Jagannathan, N. "Matrix cracking in polymer matrix composites under static and fatigue loading." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4339.

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Matrix cracking is the first and most dominant mode of damage in polymer matrix composite (PMC) laminates resulting in significant stiffness degradation under static and fatigue loading. Matrix crack evolution and its effect on stiffness degradation in cross-ply laminates under static loading have been studied extensively in the past three decades. Various analytical framework based on energy and strength-based approaches have been used to predict the matrix cracking in composite laminates. However, there have been limited studies on multi-directional (MD) symmetric laminates. In the present

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Deshmukh, Rohan L. "Lattice Boltzmann Relaxation Schemes for High Speed Flows." Thesis, 2016. https://etd.iisc.ac.in/handle/2005/4480.

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The lattice Boltzmann method (LBM) has emerged as a highly efficient model for the simulation of incompressible flows in the last few decades. Its extension to compressible flows is hindered by the fact that the equilibrium distributions rep- resent truncated Taylor series expansions in Mach number, limiting the strategy to low Mach number flows. Numerous efforts have been undertaken to extend this method to compressible flows recently. Some of these approaches have resulted in complicated or expensive equilibrium distribution functions. A few approaches are limited to subsonic

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Gagan, Versha. "Two Problems on the Parametric Resonances and Bifurcations in Rotating Beams." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4199.

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The current research work addresses two interesting systems related to rotating beams. The first dynamical system under consideration is an articulated uniform beam rotating in vacuum under vertical hub excitation along the axis of rotation. The study considers the ensuing parametric instabilities in the considered system. Parametric excitation manifests in the form of time-varying parameters of a dynamical system. Interestingly, more often than not, these time-varying parameters are time periodic in nature and possess inherent frequency/frequencies of oscillation. In an externally forced syst

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Markandeya, Saurabh. "Experimental studies on Soot and Particulate reduction in Heavy Fuel Oil Combustion." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4737.

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Heavy fuel oil (HFO) is extensively used in industrial burners and marine engines. HFO droplet combustion gives rise to carbon particulates generated by pyrolysis, which are called cenospheres. There is a current hypothesis that ‘one HFO droplet generates one cenosphere’, though there is no strong experimental evidence in support of this hypothesis. The present research deals with experimental study of HFO droplet combustion and investigates effect of HFO spray characteristics on carbon particulate emission in a spray combustion environment. A new research burner is designed to study combustio

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Badhuk, Pabitra. "Experimental and Numerical Studies on Chemically Active Flame Inhibitors." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5624.

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Fire hazards pose an increasingly potent threat to modern societies. Early identification and mitigation of fire hazards are crucial to avoid the loss of human lives and property. Recent research suggests that finely-atomized water spray consisting of droplets with a Sauter Mean Diameter (SMD) of less than 100 µm is a superior fire-suppressant compared to traditional water sprinklers (SMD  0.1 – 1 mm). The addition of chemical inhibitors further improves the effectiveness of water mist as cooling, dilution, and chemical modes of fire suppression are combined. In the present thesis, the effect

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Rangwala, Aliasgar H. "Structure of Turbulent, Swirling Round Jets." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/6008.

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The present study deals with the numerical analysis of the effect of the swirl in the self-preservation region of the turbulent round jet. However, a large number of literature exists for the analysis of near-exit regions—very few deals with the self-preservation region of the jets far downstream. The present study attempts to provide insights into the effect of swirl on the turbulent mixing and jet spread rate by examining the self-similar solution in the far-field region of the jet. The study is divided into two main portions: a comparison of the turbulent swirling and non- swirling jets and

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Singh, Manish Kumar. "Implicit Gradient Reconstruction for Unstructured Mesh Finite Volume Method." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5934.

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In the present work, an Implicit Gradient Reconstruction (IGR) method is proposed in the context of Finite Volume Methodology (FVM). There are three computationally intensive steps involved in a typical finite volume framework for a spatially second-order accurate upwind scheme. These are solution reconstruction, solution limiting and flux finding. Solution re- construction involves determination of gradients while solution limiting requires comparison of double precision numbers. Further, computation of gradient and solution limiting is cell based procedure while flux finding is edge/fa

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