Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 107 for “"Drag force"”.
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Hydrodynamic drag force in liquids
… falling at constant velocity, the hydrodynamic drag force, D, is equal to the weight of the sphere, and the drag coefficient, CD, in the formula for the drag force, D = CD( 12rv2 )A could be evaluated as a function of Reynolds number, NR = rvah , and ball radius, a. In these formulas D is the …
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Vortex Induced Vibrations of cylinders : experiments in reducing drag force and amplitude of motion
… explores the experimental minimization of the drag force and the disruption of vortex formation by utilizing VIV suppression devices. Two series of tests are conducted-both utilizing separate testing designs. The first tests are the flexible cylinder experiments, detailed in Chapter 2, which …
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Analysis of hydrodynamic drag forces acting on suspended fine particle in porous media
… The simulations results are used to compute the drag forces experienced by suspended fine particles. The drag force distributions experienced by suspended fine particles of different sizes in various compact granular porous media – ordered (simple cubic (SC), body-centered cubic (BCC), …
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Flow through and around fish farming nets
… attack. The CFD method was able to reproduce the drag- and lift coefficients of the net panel and the velocity reduction behind the net panel with satisfactory accuracy.</p><p>The approach was validated for a small size gravity cage by comparing CFD predictions with tow tank measurements of drag …
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Properties of quark gluon plasma at weak and strong coupling
… enough k1. In the second part of the thesis the drag force acting on a heavy quark propagating through the matter which is far from or close to equilibrium in a strongly coupled gauge theory that can be analyzed holographically is computed and studied. It is found that fluid velocity and …
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Investigation of Hydrodynamic and Depletion Interactions in Binary Colloidal Dispersions
… material induces both depletion and structural forces on the dispersion, which can dramatically affect both colloidal stability and near-contact hydrodynamics. This project focused on expanding our understanding of the effects of such negatively adsorbing materials on both equilibrium and …
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Deep Learning Methods for Predicting Fluid Forces in Dense Particle Suspensions
… etc. Accurate modelling of the fluid-particle forces is essential for lab-scale and industry-scale simulations. Fluid-particle system solutions can be obtained using various techniques including the macro-scale TFM (Two fluid model), the meso-scale CFD-DEM (CFD - Discrete Element Method) and …
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THE EFFECTS OF CURRENT BLOCKAGE ON OFFSHORE STRUCTURES
This thesis revisits the problem of hydrodynamic forces on fixed space-frame structures in combined waves and an in-line steady current. Because of current blockage, the actual drag force experienced by such structures is over-predicted by the standard Morison equation and the present industry …
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Boat-shaped Buoy Optimization of an Ocean Wave Energy Converter Using Neural Networks and Genetic Algorithms
… wave energy capture ratio and for the current drag force. In this work, a new approach to optimize the shape of the point absorber buoy is developed to reduce the ocean current drag force on the buoy while capturing more energy from ocean waves. A specific parametric modeling is constructed to …
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Probes of strongly interacting plasma
… we start with the novel contributions to the drag force acting on a heavy quark moving through the strongly coupled holographic plasma. The new terms are proportional to the coefficient of the axial anomaly and to the chiral asymmetry in the medium. These chiral contributions to the drag force …
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Modeling and Analysis of a Thermospheric Density Measurement System Based on Torque Estimation
… yet present air perturbs their orbits via the drag force. The drag force is poorly characterized and has a significant effect at LEO altitudes relative to other forces, making this perturbation force one of the greatest uncertainties in LEO orbit propagation. A steadily increasing number of …
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Shedding of Multiple Sessile Droplets
… is exposed to an airflow, can be shed, if the drag force overcomes the droplets adhesion force. Presence of other sessile droplets, in proximity, changes the drag force, so the minimum airflow velocity required to shed the droplets (Ucr) can vary. In this thesis, an experimental study on …
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Optimized Engine Out Procedures to Extend the Range of Jet Transport Airplanes
… optimum amount of bank angle that will minimize drag resulting from asymmetric thrust in a multiengine airplane experiencing an engine failure, can be determined. By banking the airplane into the operative engines by that optimum bank angle, the range of the airplane can be improved …
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Measurement of flow in a microfluidic channel in response to application of voltage
… in an electric field, aligning themselves with a force that is proportional to the gradient of the electric field. The drag force equally opposes the dipole force and can entrain fluid and force it to move along the length of a channel. The dipole force was estimated using a MATLAB simulation, and …
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Magnetic iron oxide nanoparticles: synthesis, characteristics, magnetic behavior, and biomedical applications
… is created in this thesis, and only the magnetic force and the drag force are taken into consideration. The magnetization of the particle is calculated by using the Langevin function, and the fluid drag force is calculated by using the Navier-Stokes equation. The trajectory function for this model …
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Characterizing drag and velocity within model mangrove forests of ordered and random tree arrangement
Changes in velocity and drag force on model mangrove trees within 13 different simulated mangrove forest segments in a flume were investigated. The simulated forests were composed of 1/12 scale model Rhizophora mangrove trees placed at three densities: low (3.42 trees/m²), medium (6.34 trees/m²), …
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An investigation into the effect of longitudinal micro-striations and their profiles, on the drag of flat plates
… grooves as a means of reducing the drag force experienced by a flat plate. V-grooves of specific dimensions are machined onto the surface of a smooth plate, in a streamwise direction. The effect of these surface modifications on the drag force of a smooth plate is examined. The use …
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The role of vortices in the formation of the solar system
… interact with the gas through the Stokes drag force, with the relaxation time specifying how quickly the particle velocity approaches the gas velocity. The particles tend to converge in high pressure vortices and drift out of low pressure systems. The convergence time is dependent on the …
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Hydrodynamic and Mass Transport Properties of Microfluidic Geometries
… using simplified transport equations and static force balances. This is possible because the length scales of these geometries ensure low Re conditions approaching the Stokesian limit, where the flow profile is laminar, viscous forces are dominant and inertial forces are negligible. This work …
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An Experimental Investigation into the Passive Reconfiguration of Flexible Plates Near a Free Surface
… its area perpendicular to the flow, to reduce drag. Decreasing the flexural rigidity of human-made structures can lead to improved designs that operate at higher propulsive efficiencies. The work presented in this thesis examines the physics surrounding a flexible plate under prescribed …
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