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 23 for “"Numerical Validation"”.
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Experimental and numerical validation of ion extractor grids
… through the beam. This thesis focuses on the validation of so-called extractor grids, which are electrostatic components that can alter the potential pro le inside the system, and therefore enable the escape of heavier particles towards the preferred exit direction that would otherwise be …
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Numerical Validation and Refinement of Empirical Rock Mass Modulus Estimation
… is a necessary input parameter for many numerical analysis methods to describe the constitutive behavior of a rock mass. Tests for determining this parameter directly by in situ test methods are inherently difficult, time consuming and expensive, and these challenges are more problematic …
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Additive and subtractive laser-pulsed nano/micro machining of metal alloys for enhanced material properties, and numerical validation
… results. The experimental, analytical and numerical analyses show very good agreement with each other and validates the hypothesis. The initial sintering results show the successful fabrication of a sintered single layer metallic powder structure with controlled porosity, using pulse period …
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A Comprehensive Numerical Investigation of Heat Transfer Dynamics in Supercritical Carbon Dioxide Cooling
… point. However, experimental studies and numerical modeling of sCO<sub>2</sub> face significant challenges, such as high-pressure environments and accurate temperature measurements. This work addresses these challenges by examining the influence of reference temperatures on numerical model …
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Multi-Resolution Techniques Based on Shape-Optimization for the Solution of Inverse-Scattering Problems
… when dealing with one or multiple scatterers a numerical validation of the proposed implementations is carried out by processing both synthetic and laboratory-controlled scattering data."
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Complex fluid dynamical computations via the Finite Volume Method
Numerical simulations of the complex flows of viscoelastic fluids are investigated. The viscoelastic fluids are modelled, primarily, via the Johnson-Segalman constitutive model. Our Numerical approach is based on finite volume method, based on the Johnson-Segalman constitutive model and implemented …
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Computational Solutions of the Forward and Adjoint Euler Equations with Application to Duct Aeroacoustics
… period. Theoretical analysis as well as numerical validation are performed in this study. In addition, the adjoint equations for the linearized Euler equations in the time domain are formulated for the Cartesian coordinates Analytical solution for adjoint equations is derived by using …
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Innovative Combinatorial Strategies for the Synthesis of Radar Tracking Antenna Systems
… of a quadratic programming procedure. In the numerical validation, a set of representative examples concerned with both pattern matching problems and pattern-feature optimization are reported in order to assess the effectiveness and flexibility of the proposed approach. Comparisons with …
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Innovative strategies for the synthesis of Time-modulated antenna systems
… by means of sub-arrayed feed network. In the numerical validation, a set of representative examples concerned with the reduction of the sideband levels and the power of the harmonic radiations are reported in order to assess the effectiveness and the flexibility of the proposed approach. …
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Fluid-structure interaction of metallic and composite plates subjected to dynamic loading
… a series of experiments and non-linear numerical analysis using the finiteelement technique. To verify the accuracy of this method for investigating impactproblems, several numerical validation studies have been conducted using publishedresults.An instrumented low velocity impact rig was …
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Finite element approximations for fluid flows governed by nonlinear slip boundary conditions of friction type: from theory to computations
… and convergence of the procedure is shown, and numerical validation tests are achieved. Chapter 2 is concerned with the finite element approximation for the stationary power law Stokes equations driven by slip boundary conditions of “friction type”. It is shown that by applying a variant of …
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Numerical Modeling and Simulation of Mineral Dissolution in Fractured Carbonate Formations
… dissolution. We have developed and implemented a numerical procedure that solves the Stokes-Brinkman equation and the reactive transport equations in a sequential fashion. In the proposed numerical procedure, the Stokes-Brinkman equation is solved by a mixed finite element method for the 2-D flow …
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Predicting Tolerance Effects on The Radiation Pattern of Reflectarray Antennas Through Interval Analysis
… is used to eliminate the wrapping effect. In numerical validation, a set of representative results, show the power bounds computations with Interval Cartesian method (IA − CS), a modified Interval Cartesian method (IA − CS*), Interval Enumerative method (IA − ENUM) and Interval Enumerative …
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Adaptive control for enhanced performance of devices and algorithms
… control-based continuation paradigm applies a numerical continuation algorithm to a reference input of the control block that ensures that the family of periodic orbits of the original plant persists and is stabilized by the presence of control feedback. Provided that such a reference input can …
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Simulation of blood flows in a stenosed and bifurcating artery using finite volume methods and OpenFOAM
Numerical simulations of the complex flows of complex (viscoelastic) fluids are investigated. The primary fluid investigated in this thesis is human blood, a complex fluid which can be modelled via viscoelastic constitutive models. The most commonly used constitutive models for viscoelastic fluids …
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Degradation behaviour of the mechanical properties of bovine cortical bone
… testing. An intermediate stage would provide validation data for a nuanced understanding of material behaviour while mitigating computational expense associated with full bone simulations. To address these gaps, this thesis develops solutions that enhance the accuracy and reliability of the …
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Modeling, Approximation, and Control for a Class of Nonlinear Systems
… of the unknown function in RKHS. Lastly, a numerical validation of this framework is presented, which could have potential applications in terrain mapping algorithms. The second topic delves into estimation and control of history dependent differential equations. This study is motivated by …
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A Multiplicative Regularisation for Inverse Problems
… in a straightforward manner. The derivation and numerical validation or this formula is presented in Chapter 4. This parameter μ supplements Abubakar’s multiplicative method, and plays an important role in the model: it enables the multiplicative model to reach its full potential, without adding …
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