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 29 for “"Diffuse interface"”.
-
Capillary forces and wetting dynamics by diffuse-interface modeling
… line are studied within the framework of the diffuse interface theory. The key to understanding the dynamics of interfacial systems lies in an accurate description of the capillary forces. In this work, we combine the diffuse interface theory with a multiphase lattice Boltzmann algorithm to …
-
Multi-physics Diffuse Interface Methods For Computational Material Modelling
… this work uses an Eulerian finite-volume diffuse interface scheme to examine high-Mach-number flows in a range of materials, including fluids, elastoplastic solids and multi-phase mixtures. This is achieved by both amalgamating existing separate diffuse interface methods for multi-phase …
-
Simulations of interfacial dynamics of complex fluids using diffuse interface method with adaptive meshing
A diffuse-interface finite-element method has been applied to simulate the flow of two-component rheologically complex fluids. It treats the interfaces as having a finite thickness with a phase-field parameter varying continuously from one phase to the other. Adaptive meshing is applied to produce …
-
A diffuse interface model of transport limited electrochemistry in two-phase fluid systems with application to steelmaking
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
-
Regularization methods on solving Poisson’s equation and Poisson Boltzmann equation with singular charge sources and diffuse interfaces
… and the surrounding solvent with ions. For diffuse interface models in which solute and solvent are separated by a smooth boundary, no effective algorithm for singular charges has been developed, because the fundamental solution with a space dependent dielectric function is intractable. In …
-
DEVELOPMENT OF GAS KINETIC FLUX SOLVERS AND THEIR APPLICATIONS
… proposed for incompressible flows. Moreover, a diffuse-interface IBM is further developed for the simulation of compressible moving boundary flows. This is the first time that the diffuse-interface IBM is successfully applied to simulate compressible moving boundary flows.
-
Thermodynamic and morphological transitions in crystalline and soft material interfaces
Interfaces are defects present in all materials. Interface transitions are characterized by abrupt changes in interface structure, chemistry and/or morphology under suitable conditions. They exist in many material systems and often produce profound changes in material properties. Several interface …
-
Numerical Methods for Compressible Multi-phase flows with Surface Tension
… numerical methods for resolving the phase interface, as well as the simulation of the phenomena occurring at the interface, such as surface tension effects, heat transfer and friction. This is because of the interactions of the fluids at the phase interface and its complex geometry. So the …
-
Adaptive Spline-based Finite Element Method with Application to Phase-field Models of Biomembranes
<p>Interfaces play a dominant role in governing the response of many biological systems and they pose many challenges to traditional finite element. For sharp-interface model, traditional finite element methods necessitate the finite element mesh to align with surfaces of discontinuities. …
-
Numerical modeling of interface dynamics and transport phenomena in transport-limited electrolysis processes
… contributes to predicting and controlling such interface instability phenomena by developing a computational model that captures them. Successful application of the model to emerging metal extraction processes demonstrates its usefulness. A phase field model of electrochemical interface is …
-
An analytic solution for magnetization distribution in multigrain ferromagnetic materials in an applied magnetic field
… model the change in magnetic properties at the interface, and boundary conditions are imposed on the direction of magnetization deep within the grains and at the interface. The effects due to the diffuse interface are included using perturbation theory. The sum of the exchange, anisotropy and …
-
Numerical modeling of resonant internal seiche triggered by unsteady withdrawal
… in an end wall. Two-layered fluid with a sharp interface and two-layered fluid with a diffuse interface are investigated. Two-layered fluid with a sharp interface approximates conditions of lakes and reservoirs in late summer or early autumn when the thermocline is quite thin, while two-layered …
-
Analysis of hairy-rod polyimides for photoalignment
… electron density at the surface and a less diffuse interface following UV exposure. Bragg features in the reflectivity curve suggested a periodical internal film morphology, which was confirmed by grazing incidence X-ray diffraction (GIXRD). Models of chain orientations are proposed for …
-
LATTICE BOLTZMANN SIMULATION OF BINARY DROP COALESCENCE AT LOW WEBER NUMBER
… binary fluid based on the Cahn-Hilliard diffuse interface approach to investigate the early-time coalescence dynamics of two liquid drops. The two drops approach each other at a very low Weber number (We) and the coalescence process is driven by surface tension. When the two drops come …
-
Oblique Shock Wave Effects on Impulsively Accelerated Heavy Gas Column
… mixing for a simple three-dimensional interface. The interface studied consists of a gravity stabilized SF6-based heavy gas jet that produced a circular column with a diffuse interface into the surrounding air. The effects of density gradient (Atwood number, A), shock strength (Mach …
-
Ab initio thermodynamics of phase-separating and cation-disordered cathodes for Li-ion batteries
… state in a single particle is not a sharp interface but rather a diffuse interface with an intermediate solid-solution region that occupies a significant fraction of the particle volume. Our results not only explain the persistence of solid-solution regions at low to moderate C-rates in …
-
A phase-field study of ternary multiphase microstructures
A diffuse-interface model for microstructures with an arbitrary number of components and phases was developed from basic thermodynamic and kinetic principles and applied to the study of ternary eutectic phase transformations. Gradients in composition and phase were included in the free energy …
-
Computational Analysis of Asphalt Binder based on Phase Field Method
… is modeled as the surface energy stored in the diffuse interface between the intact solid and crack void. To account for the growth of cracks, a non-conserved Allen-Cahn equation is adopted to evolve the phase-field variable. The energy based formulation of the phase-field method handles the …
-
On convection and stability of some welding and solidification processes
… problem with flow is used to compare a sharp interface Stefan model and a diffuse interface phase-field model. Firstly a Stefan model that includes a disparity between the density of the solid and liquid phases is derived and solved numerically. This model is compared with a recent phase-field …
Page 1 of 2