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.
Results
Showing 1 to 20 of 28 for “"Moving boundaries"”.
-
Elastic Mesh Deformation for Internal Flows with Moving Boundaries
… to control the element's distortion near the moving boundaries, Jacobian-based stiffening modification and the distance criterion method. Verification of the scheme was performed by conducting the same test as described in a journal and comparing the obtained results. The project focused on …
-
Error Assessment in FEM Calculations of Flows with Moving Boundaries
… and time dependent domains with rigid moving objects or boundaries. This method falls under the general category of Arbitrary Lagrangian Eulerian methods. In this method the global mesh is fixed and adaptations are made locally in both space and time to describe interface movement. …
-
Residual-based turbulence models for incompressible flows in domains with moving boundaries
… turbulence models for problems with moving boundaries and interfaces. The method is derived employing the Variational Multiscale (VMS) framework, which gives rise to several modeling options that are exploited to obtain accurate turbulence models. To accommodate problems with moving …
-
High Order Immersed Finite Difference Methods for Complex Domains with Moving Boundaries and Interfaces
Moving domain boundaries and material interfaces are a hallmark of multiphysics systems such as fluid-structure interaction, alloy solidification, and multiphase flows. Simulating moving interfaces with traditional techniques requires a moving mesh that continuously adapts to the interface, which …
-
Moving boundaries: civic surgeons and medical practice in the eighteenth-century Austrian Low Countries, 1700-1794
… society. Accordingly, the professional medical boundaries between surgeons and physicians were more permeable than in some other places in Europe. The emancipation of the surgeons was the biggest change in the medical landscape of the eighteenth-century Austrian Low Countries. More surgeons …
-
A Spatial Stefan Problem Modified by Natural Convection: Melting Around a Horizontal Cylinder
… terms, involve very irregularly shaped boundaries which move with time. Such problems require that the position of the boundaries be determined as part of the solution. Obvious examples can be found in the growth of crystals, in phase-change, bubble dynamics, and in cavitation problems. …
-
Moving mesh methods for solving parabolic partial differential equations
… partial differential equations with fixed or moving boundaries, using a moving mesh with continuous finite elements. The evolution of the mesh within the interior of the spatial domain is based upon conserving the distribution of a chosen monitor function across the domain throughout time, …
-
Método dos elementos de contorno aplicado a propagação de ondas gravitacionais não lineares
… 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 problems can be applied to study the hidraulic …
-
Quantitative Analysis of Microstructural Evolution in Polycrystalline Metal Matrix with Embedded Second Phase Particle
The ubiquitous motion of grain boundaries is responsible for determining the unique microstructural patterns and stability of polycrystalline materials. By employing the versatile multi-phase field modeling methodology, the role of inert, secondary particles on the dynamics of grain boundaries …
-
Nonlinear dynamics of three dimensional fluid flow separation
… three-dimensional fluid flows on no-slip curved moving boundaries. The theory provides analytic criteria for locating the separation line and approximating the shape of separation surface. Based on nonlinear dynamical systems techniques, the criteria identify separation line and separation …
-
Response Of Plasma Facing Components In Tokamaks Due To Intense Energy Deposition Using Particle-In-Cell(pic) Methods
… in the vapor-plasma cloud. In addition the moving boundaries problem has to be considered and solved at the material surface. Considering the carbon divertor as target, the moving boundaries are two since for the given conditions, carbon doesn't melt: the plasma front and the moving eroded …
-
Fluctuation-induced phenomena in non-equilibrium systems
… the dynamical Casimir effect in the presence of moving boundaries, and non-contact friction between objects in relative motion. In both cases, photons are created due to the coupling of the motion and zero-point fluctuations in the vacuum, resulting in dissipation and radiative loss. We introduce …
-
SPH modeling of the vertical flow structure and turbulence in the swash
… of tracking free surfaces with discontinuities, moving boundaries, and large deformations; such as those in plunging waves and hydraulic jumps that occur when a swash backwash collides with the following uprush. The model is initialized with a flat sea surface and the measured beach profile and …
-
A Partitioned Approach for Computing Fluid-Structure Interaction, With Application to Tumor Modeling and Simulation
… to the complex structures involved and freely moving boundaries. We propose a partitioned approach to compute FSI that integrates the direct forcing technique with the Immersed Boundary Method which is able to handle complex rigid, moving, solid and elastic structures. We then propose and …
-
Wall shear measurements in arterial flows
… in order to achieve higher-order estimation. For moving boundaries an edge detection cross-correlation algorithm has been developed and characterized, yielding sub-pixel accuracy in measuring dynamic wall position prior to estimating WSS. An original microelectromechanical system (MEMS) WSS sensor …
-
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 …
-
Methodologies for electromagnetic field modeling for computer aided analysis of multi-domain physical interactions
… propagation in geometries involving curved and moving boundaries. This methodology provides for the definition of an equivalent electromagnetic boundary value problem over a domain with fixed boundaries. A modified time-dependent operator is derived for the Lagrangian formulation, operating on a …
-
Compositional modifications in alloys under irradiation
… were applied to accommodate for the moving boundaries of the precipitate layer appearing during irradiation. The growth of the $\gamma$-Ni$\sb3$Si precipitate formed during 100 keV Si$\sp{+}$ irradiation of Ni-Si alloys was studied. Predictions of the behavior of the layer under …
-
Features of nonlinear wave-wave and wave-body interactions
… are involved: high-order nonlinear effects, moving boundaries, wavestructure interactions and complicated geometries. In this dissertation, a high-order spectral-element (HOSE) method is developed to investigate problems about nonlinear waves. An exponentially converging algorithm, it is able …
-
Development of a Virtual Scientific Visualization Environment for the Analysis of Complex Flows
… near-wall wall TRDPIV on compliant, dynamically moving boundaries. As a result, false flow-field vectors due to reflections from the boundary walls were eliminated, and allowing measurement of wall shear stress, wall shear rate, and oscillating shear index within as little as fifty microns of the …
Page 1 of 2