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 1673 for “"Numerical Simulations"”.
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Numerical Simulations in Electro-osmotic Flow
… induced by wall motion, has been modeled numerically. This type of flow simulates the physical driving mechanism that exists in electro-osmotically generated flow with large channel diameter-to-Debye length ratios (Z). The physics of the flow field were compared between the moving wall …
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Numerical simulations of x-ray clusters
We describe efforts to model the formation and evolution of X-ray clusters. After summarizing the current state of cluster observations, we describe the computational method used to model both the hot gas as well as the dark, collisionless component that observations imply. This code employs a …
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Hydrodynamics of Cyclogenesis from Numerical Simulations
… model has been very effective and widely used in numerical simulations and by experimentalists to understand complex geophysical flows. Therefore in this work, the same RRBC model is used to carry out 3D numerical experiments in a shallow cylindrical domain filled with Boussinesq fluid. In …
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Numerical Simulations of Iced Airfoils and Wings
A numerical study was conducted to understand the effects of simulated ridge and leading-edge ice shapes on the aerodynamic performance of airfoils and wings. In the first part of this study, a range of Reynolds numbers and Mach numbers, as well as ice-shape sizes and ice-shape locations were …
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Numerical Simulations of a Midlatitude Squall Line
… cloud model was used in attempts to numerically replicate the observed structure of a typical midlatitude squall line. The basic simulations described in this report were made using common temperature and moisture profiles in the vertical, and emphasis was placed on varying the …
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Numerical simulations of instabilities in general relativity
… This thesis presents our efforts to use numerical relativity to investigate some of these questions. We present a complete picture of the end points of black ring instabilities in five dimensions. Fat rings collapse to Myers-Perry black holes. For intermediate rings, we discover a …
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Numerical simulations of lobed mixer flow fields
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Numerical simulations of wings in unsteady flows
… close agreement with the experimental data. The numerical results obtained from a lifting-surface approximation are also in close agreement with the experimental data for a wing as thick as 18%. The lift and moment coefficients are affected by the thickness of a wing in oscillation and this …
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Numerical Simulations of Supercavitating Propellers and Hydrofoils
A systematic investigation is conducted to compare and evaluate the hydrodynamic performance and cavitation pattern prediction capabilities of URANS and BEM solvers for supercavitating propellers (SCPs) and hydrofoils (SCHs) with non-conventional sectional profiles. The previously developed BEM at …
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Numerical simulations of neutron star - black hole mergers
… and modifications to it were often used for numerical simulations of collisions of mixed binary systems. However, near to such objects, the gravitational forces are so strong, that the use of General Relativity is necessary for accurate predictions. There are a lot of problems in general …
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Direct numerical simulations and experimental investigation of dielectrophoresis
This dissertation deals with the numerical and experimental studies of the phenomenon of dielectrophoresis, i.e., the motion of neutral particles in nonuniform electric fields. Dielectrophoresis is the translatory motion of neutral particles suspended in a dielectric medium when they are subjected …
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Temporal Numerical Simulations of Turbulent Coanda Wall Jets
In a novel application of the temporal numerical simulation, an investigation ofturbulence modeling techniques is carried for the turbulent wall jet over aconvex surface (Coanda wall jet.) The simultaneous presence of multipleinstability mechanisms and the interaction with the turbulence dynamics …
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Numerical Simulations on the Formation of Massive Star Clusters
Die Entstehung von massereichen gebundenen Sternhaufen in Molekülwolken ist ein Wettrennen zwischen effizienter Sternentstehung und energetischen Rückkopplungsprozessen massereicher Sterne. Diese unterbinden den Sternentstehungsprozeß und treiben das Restgas aus dem System. Der Einfluß des …
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Numerical simulations of mass outflows from star-forming regions
… in a new covariant formalism which facilitates simulations in any orthogonal coordinate system. The recently developed constrained transport (CT) algorithm is implemented for the numerical evolution of the components of a magnetic field for MHD simulations. This algorithm guarantees the …
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Four-dimensional anisotropic mesh adaptation for spacetime numerical simulations
… are increasingly relying on high-fidelity numerical simulations. Within these simulations, mesh adaptation is useful for obtaining accurate predictions of an output of interest subject to a computational cost constraint. In the quest for accurately predicting outputs in problems with …
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Numerical simulations in nuclear magnetic resonance : theory and applications
Exact numerical simulations of NMR experiments are commonly required for the engineering of new techniques and for the extraction of structural and dynamic parameters from the spectra. The calculations can be very demanding, especially in the case of solid-state problems. We propose a number of new …
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Optimizing beer distribution game order policy using numerical simulations
… policy is robust, practical, and generated by numerical simulations. The model is applied in a number of experiments involving deterministic and random demand and lead time. The simulation results of my work are compared with two other artificial agent algorithms, and the improvements brought …
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Numerical simulations of vortices near free and solid surfaces
… solid surfaces has been examined using direct numerical simulation (DNS). A computer code was developed which solves the unsteady, three-dimensional Navier-Stokes equations for incompressible flow. A critical element of the numerical scheme is the efficient solution of Poisson's equation. A …
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Reliable numerical simulations of problems for pricing real estate derivatives
The globalisation of nancial systems has presented new challenges to investing in real estate assets. For example, any crisis occurring in one real estate market will have an adverse e ect on other markets regardless of them being vastly geographically distant from each other. This …
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