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 61 for “"Moving boundary"”.
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New results in stochastic moving boundary problems
Moving boundary problems arise in many areas of science and engineering and they are of great importance in the areas of partial differential equations (PDEs) since they characterize phase change phenomena where a system has two phases such as solid and liquid. However, unlike other PDEs in a …
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On a Moving Boundary Problem of Transitional Ballistics
<p>A major problem which arises in computer simulation of the firing of a gun weapon is the development of numerical schemes which effectively account for the physics of projectile motion. The chief difficulty is that away from the projectile the calculation is ordinarily accomplished on a fixed …
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A sharp interface isogeometric strategy for moving boundary problems
… any point on the interface, allowing for complex boundary conditions dependent on curvature or normal to be naturally imposed. Thus, the enriched approximation naturally captures the interfacial discontinuity in temperature gradient and enables the imposition of Gibbs-Thomson condition during …
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Optimization of an airfoil's performance through moving boundary control
The boundary-layer behavior over an airplane's wings is of great importance in take-off and landing of the airplane. If its angle of attack is increased past a critical value, the flow separates from the lifting surface, resulting in a drastic loss of lift and a major increase in drag. In response …
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Algebraic level sets for CAD/CAE integration and moving boundary problems
<p>Boundary representation (B-rep) of CAD models obtained from solid modeling kernels are commonly used in design, and analysis applications outside the CAD systems. Boolean operations between interacting B-rep CAD models as well as analysis of such multi-body systems are fundamental operations on …
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Boundary element and finite element methods for moving boundary electrochemical problems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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A Study of the Volume of Fluid Method for Moving Boundary Problems
<p>Moving boundary problems are often encountered in engineering and science. One of the methods to solve such problems numerically is the volume of fluid (VOF) method. The VOF method uses an additional field variable/to track the interface using the Eulerian fixed grid. In this work, the VOF …
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Numerical Modeling of Synthetic Jets in Quiescent Air with Moving Boundary Conditions
… in optimizing the performance of any vehicle moving through fluids. Particularly, in aerodynamics there are many potential benefits for implementing synthetic jets to achieve aircraft designs with less moving parts, uper- maneuverability, and separation control for fuel economy. Piezoelectric …
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Control of constrained moving-boundary process with application to steel continuous casting
… control techniques for coping with the nonlinear moving boundary problem dynamics. The present work provides several key building blocks towards a comprehensive solution of the continuous steel casting feedback control problem. In the first part of this dissertation, a mathematical model of the …
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Electro-deformation of a moving boundary: a drop interface and a lipid bilayer membrane
This dissertation focuses on the deformation of a viscous drop and a vesicle immersed in a (leaky) dielectric fluid under an electric field. A number of mathematical tools, both analytical and numerical, are developed for these investigations. The dissertation is divided into three parts. First, a …
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Arbitrary Lagrangian-Eulerian form of flowfield dependent variation (ALE-ADV) method for moving boundary problems
… to extend FDV method into the application of moving boundary problems where an object experiences motion and deformation in the flow. With the main objective to develop a robust numerical scheme that is applicable for wide range of flow problems involving moving boundaries, in this study, FDV …
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The relation of the temperature of the triple point of water to the ice point ; A study of the moving boundary method for the determination of transference number
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1935.
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DEVELOPMENT OF GAS KINETIC FLUX SOLVERS AND THEIR APPLICATIONS
… the extensions of the GKFSs to study complex and moving boundary problems have also been built. A GKFS-based solver combined with the immersed boundary method (IBM) has been proposed for incompressible flows. Moreover, a diffuse-interface IBM is further developed for the simulation of compressible …
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Método dos elementos de contorno aplicado a propagação de ondas gravitacionais não lineares
This work presents a boundary element method formulation in two-dimensions, to be applied either to moving boundary problems, or to problems with non moving boundaries. Isoparametric quadratic elements have been implemented to discretize the boudary. The procedure developed for non moving boundary …
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Dynamic modeling, validation, and control for vapor compression systems
… at every stage. Both finite volume and switched moving boundary approaches for nonlinear control-oriented heat exchanger modeling are presented, illustrating the key differences in the method of discretization between these approaches. Practical considerations for the numerical implementation of …
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A stabilized finite element dynamic overset method for the Navier-Stokes equations
… and interaction that may occur during unsteady moving boundary simulations. Additionally, overset grid techniques when utilized within a finite element setting mitigate many of the difficulties encountered in finite volume implementations. This research presents the development of an overset …
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A stabilized finite element dynamic overset method for the Navier-Stokes equations
… and interaction that may occur during unsteady moving boundary simulations. Additionally, overset grid techniques when utilized within a finite element setting mitigate many of the difficulties encountered in finite volume implementations. This research presents the development of an overset …
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Mathematical Modeling and Scanning Electron Microscopic Study of Biofilm on Adsorptive Media (Orthogonal Collocation Method)
… substrate diffuses in a growing biofilm (moving boundary problem); the reaction term is nonlinear; and substrate diffuses in a layered-media. An advanced numerical technique, the Global Orthogonal Collocation Method, was employed to solve the model.
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Convective mass transport for viscous flow past an evolving boundary
"A Boundary Integral-Spectral Element method is developed that solves two-dimensional Helmholtz equations. This high order technique is shown to be adaptable to a variety of boundary conditions and solves elliptic partial differential equations efficiently such that it is applicable to moving …
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