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 20 for “"Interface Tracking"”.
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Interface-Tracking by the Face-Offsetting Method for Martensitic Transformation Simulations
… enhancements to the recently developed front-tracking scheme called the face-offsetting method (FOM) In explicitly model phase interfaces. Results not only demonstrate the effectiveness of the FOM for resolving lenticular twinned microstructure with cusp-like tips but also question (a) the …
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Simulation of liquid entrainment in BWR annular flow using an interface tracking method approach
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2012.
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Computational analysis of viscoelastic free surface flows
… algorithm has also been coupled with two interface tracking techniques one of which includes surface tension effects. These techniques are the Scalar Equation Algorithm (SEA) and the Level Set Method (LSM). With both techniques the algorithms are able to take into account flow effects from …
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Sharp interface schemes for multi-material computational fluid dynamics
… governed by the Euler equations and the material interface may be considered to be a perfect discontinuity separating macroscopic pure-material regions. Working in the framework of Godunov-type finite volume methods, we develop numerical algorithms for tracking the material interface and evolving …
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Capillary-driven shape evolution in solid-state micro- and nano-scale systems
… stability analyses, analytical models, explicit interface-tracking simulations, and phase-field simulations reveal the underlying driving forces and mass flows, explain observed morphologies and instabilities, and offer insights into how to manipulate the final structure. These pathways to …
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Direct computations of marangoni driven flows using a volume of fluid method
The volume of fluid (VoF) interface tracking methods have been used for simulating a wide range of interfacial flows. An improved accuracy of the surface tension force computation has enabled the VoF method to become widely used for simulating flows driven by the surface tension force. A general …
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A Volume of Fluid (VoF) based all-mach HLLC Solver for Multi-Phase Compressible Flow with Surface-Tension
… Volume of Fluid (VoF) method: Compressive Interface Capturing Scheme for Arbitrary Meshes (CICSAM). This novel combination yields a scheme with both HLLC shock capturing as well as accurate liquid-gas interface tracking characteristics. To ensure compatibility with VoF, the Monotone …
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Numerical simulation of fragmentation and spalling and parallelization of a spacetime finite element code
… complexity, powerful dynamic adaptive meshing, interface tracking, preservation of characteristic structure and suitability for large-scale parallel computing. The interfacial damage model and dynamic adaptive meshing allow free nucleation and propagation of cracks that are located and oriented …
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Theoretical And Experimental Investigation Of The Cascading Nature Of Pressure-Swirl Atomization
… imaging allowed for both visualization and interface tracking of the swirling conical film which emanated from each nozzle. Moreover, this allowed for the measurement of the radial fluctuations, film length, cone angle and maximum wavelength. Radial fluctuations are found to be maximum near …
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Unstructured Nodal Discontinuous Galerkin Method for Convection-Diffusion Equations Applied to Neutral Fluids and Plasmas
… prevent negative densities and pressure. A new interface tracking method, mass of fluid (MOF), along with its bound limiter has been proposed in this work to compute the mass fractions of different fluids over time. Hydrodynamic models, such as Euler and Navier-Stokes equations, and plasma …
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Numerical investigation into the effects of multiple bubbles in microchannel flow boiling
… and was used to retain the leading bubbles. An interface-tracking mesh refinement method was used in all the cases. This method refined the liquid-vapour interface and a set distance around the interface, reducing the computational cost of the simulations. The results from Magnini, Pulvirenti & …
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A study of Taylor bubbles in vertical and inclined slug flow using multiphase CFD with level set
… models assuming idealized geometry of the interface, thus they carry the highest uncertainties in the mechanistic models. In this work, sensitivity analysis has determined that Taylor bubble velocity in slug flow is one such closure relation which significantly affects the calculation of …
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Development and application of Lattice Boltzmann and accurate volume of fluid numerical techniques on graphics processing units
… technique where continuity, momentum, and interface tracking equations are solved. The volume of fluid (VOF) method is used for accurate representation and tracking of the interface, and a pressure balance method is used for pressure gradient and other discontinuous body forces in the …
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Modelling and computational analysis of heat-transfer in multi-geometry and multi-phase flow of Newtonian and non-Newtonian fluids in pipes and channels
… the volume-of-fluid (VOF) methods for liquid-gas interface tracking as well as the volume-fraction methods to account for the concentration of embedded solid nano-particles in the liquid phase. Water is used as the base-liquid and the solid phase is modelled via metallic nano particles, both …
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Multiphysics Model of Hypervelocity Impact and Impact Induced Plasma Formation
… The framework addresses challenges such as interface tracking under large deformation and discontinuities in state variables and material models. Each of the three material subdomains — metallic projectile, silicate target, and gaseous environment — is modeled using a distinct equation of …
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Development of optimized core design and analysis methods for high power density BWRs
… Boiling (DNB) and dryout using the two phase interface tracking method was proposed and initial results are presented. It is shown that the twist of the HCF rods promotes detachment of a vapour bubble along the elbows which indicates no possibility for an early DNB for the HCF rods and in fact …
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Spray Freeze-Drying as a Solution to Continuous Manufacturing for Preserving Macromolecules
L'abstract è presente nell'allegato / the abstract is in the attachment
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Modelling of the liquid slag behaviour in the continuous casting mould
… the transient behaviour of the steel/slag interface. The research was carried out in collaboration with ArcelorMittal Research (AMR), based in Maizieres-les-Metz in France. The industrial objective of the thesis was to understand the factors affecting the transient behaviour of the liquid …
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Numerical Flow Modeling of Artificial Upwelling
Pathways towards limiting global warming to well below 2°C, as internationally determined in the 2015 Paris Agreement, typically include active Carbon Dioxide Removal (CDR) from the atmosphere in addition to fast and drastic reduction of greenhouse gas emissions. Artificial upwelling of …