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 24 for “"mesh-free"”.
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Mesh-free modeling of spatially inhomogeneous aerosols in arbitrary geometries
… inhomogeneous aerosol modeling. To do so, a mesh-free DSMC alternative was used that takes advantage of Euclidian distance in its clustering algorithm. Deposition, coagulation, and condensation cases were addressed for aerosols inside several fundamental and complex geometries. The first …
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Physically Based Mesh-free Deformation Framework and Techniques for Computer Graphics
In this thesis, we introduce a mesh-free deformation framework. Four different applications are presented based on it. Among them, a technique of mesh-free deformations and a technique ofreusable deformations are to model the deformations in two different ways, while the hyper-twist and the force …
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Development of mesh-free methods and their applications in computational fluid dynamics
… decade has witnessed a research boom on the mesh-free methods. It is well-known that the mesh-free method has a few clear advantages over the mesh-based method such as the requirement of node generation instead of mesh generation and easy deletion/insertion of new nodes. Up to date, a lot of …
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NOVEL NUMERICAL PROCEDURES FOR LIMIT ANALYSIS OF STRUCTURES: MESH-FREE METHODS AND MATHEMATICAL PROGRAMMING
… procedure. In this research, the Element-Free Galerkin (EFG) discretisation strategy is used to approximate the displacement and moment fields in plate and slab problems, and second-order cone programming (SOCP) is used to solve the resulting discretised formulations. A numerical procedure …
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Combining numerical simulation and machine learning - modeling coupled solid and fluid mechanics using mesh free methods
The prediction and understanding of physical systems is largely divided into two camps, those based on data, and those based on the numerical models. These two approaches have long been developed independently of each other. This work shows further improvements of the modeling of physical systems …
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DEVELOPMENT OF HIGH-ORDER FINITE VOLUME METHODS ON UNSTRUCTURED GRIDS AND THEIR APPLICATIONS
… existing high-order methods, two straightforward mesh-free scheme-based high-order finite volume (FV) methods on unstructured grids are developed in this thesis for simulation of various flow problems. Under the basic framework of the unstructured finite volume method, a high-order polynomial …
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Accelerating a Coupled SPH-FEM Solver through Heterogeneous Computing for use in Fluid-Structure Interaction Problems
… presents a partitioned approach to simulating free-surface flow interaction with hyper-elastic structures in which a smoothed particle hydrodynamics (SPH) solver is coupled with a finite-element (FEM) solver. SPH is a mesh-free, Lagrangian numerical technique frequently employed to study …
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Computational methods for two-phase flow with soluble surfactant
… transition layer equation is first solved by a mesh-based numerical method that has a spectrally accurate equal arc length frame for discretization of the interface and a second order time-step. Results of numerical simulations are presented for a range of different physical parameters. An …
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Solution of the Fokker-Planck Equation by Sequentially Optimized Meshfree Approximation
… by applica- tion of the Sequentially Optimized Meshfree Approximation (SOMA) method. It is well known that numerical solution of the Fokker-Planck equation is made di cult by the challenges of positivity enforcement, in nite domain, and high dimensionality. Through the use of optimization, …
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Option pricing with physics-informed neutral networks (PINNS)
… initial/terminal conditions of the PDE. They are mesh-free to an extent and compute the derivatives of the PDE through backward-propagation. We construct a PINN toy example to solve the Black-Scholes-Merton PDE for a vanilla European option. The numerical solutions from the PINN are compared …
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Smoothed Particle Hydrodynamics method and flow dynamics: the case of lava numerical modeling and simulation
… Particle Hydrodynamics è un metodo Lagrangiano mesh-free che sta riscuotendo interesse nel campo della fluidodinamica computazionale. Grazie alla sua natura, il metodo SPH è in grado di gestire fluidi complessi caratterizzati da reolgie non-Newtoniane, superfici libere, dipendenze dalla …
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High-Fidelity Numerical Simulation of Shallow Water Waves
… available three-dimensional results obtained by mesh-free smoothed particle hydrodynamics and volume of fluid methods. My results suggest that depth-integrated equations, given the current hardware computational capacities and the large scales of the problems in hand, can produce results as …
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SPH modeling of the vertical flow structure and turbulence in the swash
… obtained near La Jolla, CA in fall 2003. The mesh-free model is based on the Lagrangian description of fluid particle motion, and is capable of tracking free surfaces with discontinuities, moving boundaries, and large deformations; such as those in plunging waves and hydraulic jumps that occur …
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Smoothing Particle Hydrodynamics parallel implementation for numerical modelling of solid-fluid interactions
… effcient parallel implementation of a Lagrangian mesh-free method based on the Smoothing Particle Hydrodynamics technique to analyse the behaviour of solids and fluids. The proposed solution makes use of different techniques to improve the computational complexity of the simulation. To improve the …
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Semi-analytic time-domain solutions to wave-scattering problems
… late-time solutions. The method is entirely mesh-free, allowing evaluation of the solution anywhere in the space-time domain.
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A WC-MPS Model for Viscous Free Surface Flows
… In hydrodynamics simulations, the tradition mesh-based methods have been the dominant methods for decades, but they will fail in the simulation of free surface flow problems due to the large deformation and fragmentation, and they suffer from some problems whose objects are a set of discrete …
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Quasi-Monte Carlo and Picard Iteration Algorithms for the Nonlinear Hydrodynamics, Dynamics and Controls of Wave Energy Converters
… compatible with the fluid force impulses. A mesh-free geometric representation using signed distance functions circumvents the numerically sensitive mesh-mesh surface intersection at each time step, and a continuously differentiable boundary blur accelerates the QMC convergence. These …
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Numerical modelling of hydrodynamic and solute transport processes in shallow water environment
… results. In the solute transport modelling, a mesh-free, depth-averaged and highly robust random walk model has been developed for simulating the two-dimensional solute transport processes. The development of the random model consists of two stages. In the first stage, extensive parametric …
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Sampling, non-linearities and scales: rethinking convolutional neural networks from a signal processing perspective
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Simulation of free-surface flows and development of an improved particle method
Undergoing development for decades, the mesh-free methods, both Smoothed Particle Hydrodynamics (SPH) and the Moving Particle Semi-implicit method (MPS), have become useful numerical tools for studying free-surface flows in various engineering problems. They are able to easily simulate complicated …
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