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 “"Coupled Flow"”.
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Coupled flow/deformation analysis of jointed rock with the distinct-element method
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1987.
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Computer-aided optimal design for laminar and turbulent fluid-thermal systems
… and energy-conservation equations for strongly coupled flow problems. Then the design sensitivities of the system response are computed and used in a numerical optimization algorithm to minimize pressure drop in flow through contractions. Both laminar and turbulent flows are considered. In the …
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Integration of micro- and macroscopic models for pedestrian evacuation simulation
… simulator and procedurally generate macroscopic flow graph models of building space, integrating micro- and macroscopic approaches to simulation of the same emergency space. By “coupling” flow graph parameters to microscopic simulation results, the graph model captures some of the higher detail …
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Cost-optimal design of a household batch electrodialysis desalination device
… selection of a batch architecture, for which a coupled flow-mass transport model to predict desalination rate was developed, and validated using a lab-scale ED stack. The effects of varying the production rate (9-15 L/hr) and product concentration (100-300 mg/L) requirements on optimal selection …
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Analysis of Ship Airwakes Using Modal Decomposition
… The funnel wake above the superstructure, the flow recirculation region lee of the hangar door, and the flight deck vortices near the ship's stern were examined. Insights into their large-scale motions were provided, including the effects of the bistable flow recirculation region, and the …
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Contributions to Ship-Airwake-Rotor Coupling Characterization Using Controlled Forcing
… as the dynamic interface (DI), encompassing the coupled effects of the ship airwake, rotor wake, flight dynamics, and pilot response. A central aspect of the DI is the aerodynamic interaction between the ship airwake and the rotor wake, which degrades handling qualities and increases pilot …
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Modeling the transport of sand and mud in the Minnesota River
… To achieve this, we developed a one-dimensional, coupled flow, sediment transport, and channel bed/floodplain morphodynamics model and derived model inputs from field parameters where possible. We show that sediment output from the system is predominantly wash load, and that changes in bed …
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Numerical Modelling of Wind-driven Hydrodynamics in Shallow Wastewater Ponds and Coastal Estuaries
… wind-driven, with smaller contributions from outflows, and circulation patterns were classified into four hydraulic regimes. Vertical temperature differences of up to 8.0°C over the 1.7 m depth between the surface and bed were observed during an 8-month monitoring period, inhibiting mixing …
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Complex flow and transport phenomena in porous media
… partial differential equations related to the coupled surface and subsurface flows and develops efficient high order discontinuous Galerkin (DG) methods to solve them numerically. Specifically, the coupling of the Navier-Stokes and the Darcy's equations, which is encountered in the …
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Application of the Variational Fracture Model to Hydraulic Fracturing in Poroelastic Media
… rock deformation, fracture propagation and fluid flow in the both the fracture and reservoir. In this dissertation, a fully coupled hydraulic fracturing simulator is developed by coupling reservoir-fracture flow models with a mechanical model for reservoir deformation. Reservoir-fracture …
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Computational stress analysis using finite volume methods
… • Formulation of an integrated CFD solver for coupled flow, heat transfer and stress calculations. Comparison with a 2-solver approach: - Integrated approach is much faster and substantially less memory intensive than 2-solver approach. Comparisons between the new formulation and traditional …
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Numerical modeling, uncertainty analyses, and machine learning for decision support in the geosciences.
… waste repository site in Texas. For this, MODFLOW and MODPATH were used to simulate hydraulic head and particle/tracer travel times. Later, linear and nonlinear uncertainties were quantified for model parameters (hydraulic conductivities) and prediction of particle travel times along with …
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NAPL (Non Aqueous Phase Liquid) source characterization based on dissolved contaminant concentrations
… of this research we developed a two-dimensional coupled flow/dissolution/transport model for a spatially distributed residual NAPL source. We modeled the distributed NAPL as a first order gradient driven source term of the dissolved phase transport equation. Since this model was specifically …
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Numerical modeling of river migration incorporating erosional and depositional bank processes
… nonlinear depth-averaged iterative scheme with coupled flow and in-channel bed morphodynamics is developed and implemented so as to capture width variation. Both the migration model and the in-channel morphodynamics model have been coupled adopting a slow planform evolution approximation i.e. …
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Geomechanical Reservoir Model Calibration and Uncertainty Assessment from Microseismic Data
… to carry information about the underlying coupled flow, geomechanics, and thermal processes and hence rock hydraulic and geomechanical property distributions. We develop a probabilistic framework called stochastic seismicity-based reservoir characterization (SSBRC) to integrate microseismic …
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Analysis of large deformation offshore geotechnical problems in soft clay
… clay and proposes a methodology for performing coupled flow and deformation analyses with advanced effective stress models. The first part of the research focuses on realistic 3-D finite element analyses (using AbaqusTM Standard) of a conductor (steel pipe pile) embedded within soft marine clay …
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FINITE ELEMENT METHODS AND MACHINE LEARNING FOR SOME MULTI-PHASE PROBLEMS
… on computational models for complex interface coupled flow problems. The problem is studied both numerically and analytically. More specifically, an unfitted finite ele- ment approach for the simulation of a two-phase flow with an immersed material viscous interface is studied in the first and …
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Coupled non-linear diffusion under periodic boundary conditions
… analytically intractable for any generality of coupled flow. On the contrary, simulation indicates that a phenomenon of coupled entrainment occurs in which initial profiles are subsumed into the periodicity of the dominant input variation. The propensity of the system to establish quickly such …
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Efficient algorithms for flow models coupled with geomechanics for porous media applications
The coupling between subsurface flow and reservoir geomechanics plays a critical role in obtaining accurate results for models involving reservoir deformation, surface subsidence, well stability, sand production, waste deposition, hydraulic fracturing, CO₂ sequestration, and hydrocarbon recovery. …
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Structure-Preserving High Performance Computational Methods for Transport in Porous Media
… need for improving the performance of subsurface flow and transport simulations has become an area of active research. Two of the most well known numerical deficiencies that the pop- ular formulations and existing simulation packages suffer from are the inability to meet the non-negative …
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