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 21 for “"In-house code"”.
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Design of compact intermediate heat exchangers for gas cooled fast reactors
Two aspects of an intermediate heat exchanger (IHX) for GFR service have been investigated: (1) the intrinsic characteristics of the proposed compact printed circuit heat exchanger (PCHE); and (2) a specific design optimizing economic and technical efficiency while coupling a supercritical CO2 …
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Numerical Investigations of Magnetohydrodynamic Hypersonic Flows
… (MHD) hypersonic flow are presented for both laminar and turbulent flow over a cylinder and flow entering a scramjet inlet. ANSYS CFX is used to carry out calculations for steady flow at hypersonic speeds (Mach number > 5). The low magnetic Reynolds number (<<1) calculated based on the velocity …
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Probing the dynamic scaling hypothesis in 1-D coarsening particle systems
… provide the reader with an idea of what coarsening is and when and where it may occur. The concise definition of coarsening that we employ is that characteristic length scales grow in time. The Dynamic Scaling Hypothesis which asserts that upon suitable scaling of space, features of latetime …
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Investigation of a Highly Loaded, High Pressure Ratio Axial Turbine Stage for Industrial Applications
<p>The turbine component of a gas turbine engine is the most costly component due to its complexity, and life requirements, given the harsh environment in which it is required to operate. Minimizing the number of stages can lead to significant savings in terms of development efforts, materials, and …
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A Proper Orthogonal Decomposition-based inverse material parameter optimization method with applications to cardiac mechanics
We are currently witnessing the advent of a revolutionary new tool for biomedical research. Complex mathematical models of "living cells" are being arranged into representative tissue assemblies and utilized to produce models of integrated tissue and organ function. This enables more sophisticated …
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Droplet Drag Modeling on Spray Conditions
Numerical approaches have been conducted to investigate the effect of droplet deformation and internal circulation on droplet dynamics. Although droplet drag is a classical area of study, there are still theoretical gaps in understanding the motion of large droplets. In applications such as spray …
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Research in CO2 reduction by carbonation
… slip model has been developed and tested in the CFD software suite PHYSICA, for the simulation of gas-solid flow. It has been combined with reaction code and used to simulate a carbonator and a calciner as part of a carbonation cycle for carbon capture in two and three dimensions. Carbon …
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Partition density functional theory
… functional theory (PDFT) is a method for dividing a molecular electronic structure calculation into fragment calculations. The molecular density and energy corresponding to Kohn Sham density-functional theory (KS-DFT) may be exactly recovered from these fragments. Each fragment acts as an …
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Development and application of a steady state code for supercritical carbon dioxide cycles
… supercritical CO2 power conversion system is of interest for advanced nuclear reactor applications because the same efficiencies are obtained as for the most developed of the closed gas-turbine cycles (helium-Brayton), but at lower temperatures and higher pressures. The original in-house code, …
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An evolutionary fuel assembly design for high power density BWRs
… fuel assembly design was studied as a means to increase the power density of current and future BWR cores. The new assembly concept is based on replacing four traditional assemblies and large water gap regions with a single large assembly. The traditional BWR cylindrical UO2-fuelled Zr-clad fuel …
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Analysis of Composites using Peridynamics
Since the last century a lot of effort has been spent trying to analyze damage and crack evolution in solids. This field is of interest because of the many applications that require the study of the behavior of materials at the micro- or nanoscale, i.e. modeling of composites and advanced aerospace …
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Local maximum entropy approximation-based modelling of the canine heart
… property which allow the solutions to be continuous and smooth as compared to the Moving Least Square method (MLS) which is used in the Element Free Galerkin method (EFG). The method is based on a convex optimisation scheme where a non-linear equation is solved with the help of a Newton …
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Methods Development and Validation for Large Scale Simulations of Dense Particulate Flow systems in CFD-DEM Framework
… Discrete Element Method (CFD-DEM) is widely used in simulating a large variety of particulate flow system. This Eulerian-Lagrangian technique tracks all the particles included in the system by the application of point mass models in their equation of motion. CFD-DEM is a more accurate (and more …
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An ab-initio study of bilayer graphene using higher order quantum chemical methods
… methodologies aimed at accurately describing van der Waals interactions at the nanoscale. In this context, Density Functional Theory (DFT)71,90 has played a key role when describing the ground-state properties of a wide variety of molecular systems, under local and semi-local …
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Computational Modeling and Impact Analysis of Textile Composite Structutres
This study is devoted to the development of an integrated numerical modeling enabling one to investigate the static and the dynamic behaviors and failures of 2-D textile composite as well as 3-D orthogonal woven composite structures weakened by cracks and subjected to static-, impact- and …
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Hybrid Opto-Electrokinetic Technique For Micro/nanomanipulation: Towards Application Of A Novel Non-Invasive Manipulation Technique In Microbiological Assay
… various physical mechanisms of the Rapid Electrokinetic Patterning (REP) technique suggested for rapid and precise on-chip manipulation of colloids and fluids, and bio-compatibility of the technique for biological applications. REP is a hybrid opto-electrokinetic technique that is driven by the …
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Análise numérica de escavação em rochas salinas com possibilidade de reativação de falhas via técnica de descontinuidades fortes
… a apresentar um comportamento tensão deformação inelástico que pode se mostrar complexo, envolvendo processos de fluência, com endurecimento ou abrandamento podendo levar à ruptura. No processo de escavação de evaporitos submetidos a tensão constante ocorre o fenômeno de fluência que pode …
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Modeling transient multiphase flow and mold top surface behavior in steel continuous casting
… and applies a system of computational models to investigate transient multiphase turbulent flow physics in the mold region and mold top surface behavior during continuous casting of steel slabs. Each model can be used independently or combined together as a comprehensive system to gain insights …
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Mechanical Properties of Cellular Core Structures
… technology for light weight structures in the aerospace industry. In an aerospace product, sandwich panels with cellular core represent the primary structural component as a given aerospace product may contain a large number of sandwich panels. This reveals the necessity of understanding …
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Multiscale Peridynamics Analysis of Nanocomposites and Energetic Materials Using Nonlocal and Local Interface Models
Interface modeling is a critical aspect in any multi-material system modeling. Even a small change in the interface model may lead to significant changes in material behavior of the microscale, and these changes may transfer up to higher scales influencing the strain and stress fields, and damaging …
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