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 222 for “"Complex Geometries"”.
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Wave Tracking in Complex Geometries
A new equation of state (EOS) for a reactive, non-ideal explosive was developed to be used in the explosive applications. The new EOS was based on the earlier work of W. C. Davis, who developed equations of state for the reactants and products separately. The new EOS presents a plausible way to …
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Nonlinear fluid dynamics in complex geometries
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Nonlinear dynamics of viscoelastic flows in complex geometries
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1991.
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An adaptive hybrid mesh generation method for complex geometries
An adaptive hybrid mesh generation method is described to automatically provide spatial discretizations suitable for computational fluid dynamics or other 2D solver applications. This method employs a hierarchical grid generation technique to create a background mesh, an extrusion-type method for …
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CFD-based erosion modelling of simple and complex geometries
… erosion modelling method for simple and complex geometries. Erosion testing has been carried out on a range of choke valve materials to provide the fundamental data required in constructing equations that relate erosion rate to particle impact velocity and angle. These equations have in …
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Large Eddy Simulation and Analysis of Shear Flows in Complex Geometries
… investigate two types of shear flows in complex geometries, (i) a novel momentum driven countercurrent shear flow in dump geometry and (ii) a film cooling flow (inclined jet in crossflow). Verification of subgrid scale model is done through comparisons with measurements for a turbulent …
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Phononic metamaterials based on complex geometries : "a new kind of metamaterial"
… is included in the framework since fractal geometries shows structures at all scales (usually discrete and finite in physical world). We developed our framework using metamaterials since it enable us to design "atoms" or "molecules" and their relative arrangement with greater freedom (i.e. …
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The large-eddy simulation of incompressible flows in simple and complex geometries
… physics of an incompressible flow in simple and complex geometries. The Cartesian form of the governing equations was first verified, and then later used to investigate a three-dimensional shear-driven cavity flow. The investigation involved Reynolds numbers of 2000, 3200, 5000 and 10000 and …
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Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries
… the non-linear elastic propagation in parts with complex geometry. Cellular Automata is introduced as a new simulation method, in order to develop new analysis on quadratic non-linearities. An existing linear code was progressively modified to take into account a different constitutive law. Also …
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Tools for Analysis of Complex Geometries for a Combined Cycle SCRAM Jet / Rocket
… made to the CFD code to accommodate the complex geometries that necessarily were incorporated in the grid. Results are discussed at the end.</p>
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Strategy development for object-oriented multiblock grid generation and adaptation to complex geometries
… for multiblock structured grid generation to complex geometries. Based on the grid generation practices over years, a set of grid construction rules is developed to provide the CFD engineer an object-oriented method for grid design. The essential core of the object-oriented method is to …
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JUSTGrid: a pure Java HPCC grid architecture for multi-physics solvers using complex geometries
… for high performance computing dealing with complex 3D geometries. The framework should also take care of all the advantages and behaviours of modern multi-core/multi-threaded hardware architectures. In view of the increasing complexity of modern hardware, working on solutions of …
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Initiated chemical vapor deposition of fluoropolymer coatings for the surface modification of complex geometries
Initiated chemical vapor deposition (iCVD) is a one-step, soventless process that can be used to produce polymeric thin films. The iCVD technique has been used to polymerize a wide variety of vinyl monomers such as glycidyl methacrylate (adhesive) and 2-hydroxyethyl methacrylate (hydrophilic). The …
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3D FE simulation of the welding process to optimise residual stress profiles in complex geometries
Welded, thick-walled, tee branch junctions are complex piping components commonly used in the nuclear power and petrochemical industries. Owing to the relatively large wall thickness, weldments are often constructed in several passes. Each successive pass alters the stresses caused by previous …
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Application of the Fekete spectral element method in stress analysis of plates involving holes and complex geometries
… of our code is shown by solving solutions with complex geometry and holes.
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Modelling and analysis of complex electromagnetic problems using FDTD subgridding in hybrid computational methods. Development of hybridised Method of Moments, Finite-Difference Time-Domain method and subgridded Finite-Difference Time-Domain method for precise computation of electromagnetic interaction with arbitrarily complex geometries
… of this research is to model and analyse complex electromagnetic problems by means of a new hybridised computational technique combining the frequency domain Method of Moments (MoM), Finite-Difference Time-Domain (FDTD) method and a subgridded Finite-Difference Time-Domain (SGFDTD) method. …
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SURFACE SCIENCE APPROACH TO ATOMIC LAYER DEPOSITION CHEMISTRY
… of solid thin films with high conformality on complex geometries such as heterogeneous catalysts and microelectronic devices. In this work, surface sensitive characterization techniques have been employed to investigate initial precursor-substrate reactions and ALD surface chemistry.
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Design, Analysis and Fabrication of Complex Structures using Voxel-based modeling for Additive Manufacturing
… (AM) is the opportunity to design and fabricate complex structures that cannot be made via traditional means. However, this potential is significantly constrained by the use of a facet-based geometry representation (e.g., the STL and the AMF file formats); which do not contain any volumetric …
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Modeling of Electromagnetic and Elastic Wave Fields in Complex Geophysical Sensing Environments
… domain. The new code can be used to model very complex geometries with high medium contrast. Interesting simulation results are obtained for the NMR antenna.
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Investigation of the Body Segment Inertial Properties and Long Bone Geometries of a Mid-Sized Male Finite Element Model
Simulations of complex blunt trauma events have become possible due to advances in computational human body modeling via finite element analysis.[3-8] These models have the potential to elucidate previously unknown injury mechanisms and can inform regulatory agencies directed at public health and …
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