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 28 for “"Velocity Potential"”.
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The velocity potential of an hyperbolic horn
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1937.
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Horizontal and vertical structure of velocity, potential vorticity and energy in the Gulf Stream
… construct a horizontal and vertical profile of velocity in the Gulf Stream, from which a cross-section of the mean potential vorticity can be produced. The latter shares many common feature with cross-sections from past work for a nearby site, as well as analogous data from a three-layer …
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Horizontal and vertical structure of velocity, potential vorticity and energy in the gulf stream
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1985.
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A Climatological Analysis of Upper-Tropospheric Velocity Potential Fields using Global Weather Reanalysis, 1958-2020
Upper-tropospheric (200 hPa) velocity potential is useful in identifying areas of rising or sinking atmospheric motions on varying temporal scales (e.g., weekly, seasonal, interannual) especially in the global tropics. These areas are associated with enhancement (rising motion) or suppression …
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Vapor Bubble Detachment in Subcooled Pool Boiling at Zero Gravity
… the time integral of the force. The liquid velocity is derived from the velocity potential. Heat and mass transfer across the interface are governed by a nonequilibrium model. The liquid temperature on the interface is regarded as a parameter. By introducing explicit forms for the velocity …
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Acoustic scattering in waveguides with smoothly-varying or discontinuous elastic boundaries
… equation, the solution to which enables fluid velocity potential to be written as an explicit integral transform. The two main problems to which the method is applied are a two-dimensional waveguide with a varying impedance condition and an elastic-walled waveguide with varying bending …
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A Mathematical Model of Horizontal Wells Productivity and Well Testing Analysis
… well as a uniform line source, this thesis finds velocity potential formula and the productivity formulae for a horizontal well in an ellipsoid of revolution drainage volume by solving analytically the involved three-dimensional partial differential equations. These formulae can account for the …
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Gas forces during the rapid opening of disc valves
… is based on two-dimensional or axisymmetric potential fluid flow and uses the Finite Element method. The method employs the velocity potential Ø as the primary unknown and 8-node quadrilateral elements of arbitrary shape to represent the region of flow under study. This method is equally …
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Modulation of South African summer rainfall by global climatic processes
… mass overturnings are investigated through the velocity potential and derived parameters (the Zonal Circulation and Meridional Circulation Indices). The results suggest that the vertical tropospheric cells are among the important associated components which modulate climate across southern …
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Analytical and Numerical Studies of the Generation and Propagation of Nonlinear Water Waves by a Wavemaker
… a series of high-order normal derivatives of the velocity potential. To guarantee accuracy and convergence we must: (a) solve for these derivatives in integral form through recursive use of Green third identity, while (b) imposing a 𝐶¹-continuity condition on the velocity potential at the …
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Analysis of the vibrations of inflatable dams under overflow conditions
… of the membrane’s equations of motion and the velocity potential problem is formulated by the boundary element method. After the eigenvalue problem is solved, the eigenvalues and eigenvectors obtained are employed to describe the vibrations of the dam. The effects of the dam‘s density and …
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Theoretical modelling of two wave-power devices
… flow, we develop a linear theory for the velocity potential for the case of a coastline of arbitrary apex angle. Scattering and radiation problems are solved separately using eigenfunctions expansions, and are then combined to study the energy extraction rate. Numerical simulations for a …
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Three-Dimensional Analysis of Moored Cylinders Used as Breakwaters
… to be inviscid and incompressible, so that the velocity field can be written as the gradient of the velocity potential. A boundary integral method is used to solve the integral equations that define the external fluid flow. Free vibrations of the cylinder in both air and water are considered and …
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Computation of nonlinear hydrodynamic loads on floating wind turbines using fluid-impulse theory
… of temporal and spatial gradients of the velocity potential in the Bernoulli equation and the discretization of the nonlinear free surface. The module computes linear and nonlinear loads - including hydrostatic, Froude-Krylov, radiation and diffraction, as well as nonlinear effects known …
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Adjoint-based optimization for hyperbolic balance laws in the presence of discontinuities
… problem for the volume fraction, where the velocity is given by a velocity potential instead of the Navier-Stokes equations. This allows us to specifically study the formulation of the cost functional and the viability of using a Heaviside function as a representation of the interface (as …
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Variability of summer rainfall over southwestern Madagascar
… with ENSO indices, SIOD index, SST, 850 hPa geopotential height, zonal and meridional winds at the surface. Composite anomalies of moisture flux and moisture flux convergence at 850 hPa, 500 hPa omega and velocity potential at .995 sigma level, using NCEP/NCAR reanalysis data, associated with El …
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A nonlinear wave load model for extreme and fatigue responses of offshore floating wind turbines
… hydrodynamic forces on floating bodies which is potentially applicable in a wide range of problems in ocean engineering. The total fluid force acting on a floating body is obtained by the time rate of change of the impulse of the velocity potential flow around the body. This new model called …
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Wave loads on offshore wind turbines
… hydrodynamic forces on floating bodies which is potentially applicable in a wide range of problems in ocean engineering. The total fluid force acting on a floating body is obtained by the time rate of change of the impulse of the velocity potential flow around the body. This new model called …
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Satellite derived rainfall over tropical Africa : its pattern variability and calibration
… by a few pentads. Hovmoller plots for OLR and velocity potential reveal that the intra-seasonal oscillations over tropical Africa are dominated by eastward propagation. However, standing and westward propagation are also observed. Propagation is weak over east African coast due to strong …
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