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 81 for “"flow modeling"”.
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Geochemical Flow Modeling
… model assumes thermodynamic equilibrium between flowing electrolyte solutions and stationary mineral assemblages, and solves for the mineral identities and compositions and aqueous compositions as a function of both time and position. The development considers both dissolution and precipitation …
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Numerical Flow Modeling of Artificial Upwelling
… options for artificial upwelling, a numerical modeling toolbox for studies on the techno-economic feasibility and effectiveness of artificial upwelling is developed. The numerical methods are based on the open-source framework OpenFOAM® and aim to be generally applicable to studies of buoyant …
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Physics-based, reduced-order combustor flow modeling
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Integrated multiphase flow modeling in wellbore for downhole pressure predictions
… of various disciplines that pertain to the flow of fluids within a conduit, knowing the bottomhole flowing pressure (P_wf) and pressure profile in the wellbore are of undeniable significance. One would ask why not deploy downhole pressure gauges to obtain P_wf readings. Unfortunately, it is …
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Advancement of closure relations for annular flow modeling in CFD
… ability to model the complex three-dimensional flow structures in annular flow regime [1], while physics-based constitutive equations are needed to accurately represent the phase interactions, particularly at the liquid film interface. The development of closure relations for droplet deposition …
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Product development timing and cost analysis using information flow modeling
In product development processes. coupled tasks are mutually dependent for information. and there is not a clear sequence in which these tasks should be performed. In this thesis we set to answer the following questions (I) what is the proper ordering in which the tasks should be started and (2) …
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Constraints on mantle convection from seismic tomography and flow modeling
… high resolution seismic tomography and realistic flow modeling to constrain mantle convection. The bulk of the data used in the tomographic imaging are millions of P, pP and pwP travel time residuals, read from high frequency seismic records. The distribution of earthquakes and stations results in …
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Mitigating the Problem of Non-uniqueness in Fluid-flow Modeling
Modeling fluid flow in porous media is a valuable and essential tool for developing underground resources such as hydrocarbon reservoirs, groundwater aquifers, or CO₂ sequestration projects. The modeling, if done accurately, can provide a reliable forecast of future fluid behavior. However, the …
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Cyber-security Aware Traffic Flow Modeling and Data Processing Power Optimization
… and macroscopic traffic variables such as delay, flow, and speed. Numerical experiments reveal critical trade-offs, as malicious message share increases, the system must prioritize defensive processing at the cost of responsiveness, leading to changes in traffic efficiency. Our findings emphasize …
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Microscopic description of the granular fluidity field in nonlocal flow modeling
A recent granular rheology based on an implicit 'granular fluidity' field has been shown to quantitatively predict many nonlocal phenomena. However, the physical nature of the field has not been identified. Here, the granular fluidity is found to be a kinematic variable given by the velocity …
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Multiphase flow modeling and deposition of hydrates in oil and gas pipelines
Multiphase flow is a ubiquitous feature of oil and gas production and hence, all flow assurance issues involve multiphase flow. The risk of plugging due to gas hydrate formation remains one of the most prevailing flow-assurance problems in deepwater subsea oil and gas operations. Due to the …
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Conical flow modeling for polygonal cross section bodies at off design conditions.
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1977
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An effective medium approximation and Monte Carlo simulation in subsurface flow modeling
… procedure for solving the stochastic groundwater flow problem are presented. The effective medium approximation permits one to solve the stochastic groundwater flow problem in a single run to generate the expected pressure head field. The proposed effective hydraulic conductivity expression for …
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Conduction Plus Convection Heat Flow Modeling for the Linga Complex, Peruvian Coastal Batholith
… petrography, geochemistry data, and computer modeling. Field work and petrography involved collecting samples for geochemical analysis and documenting widespread propylitic and potassic hydrothermal alteration. Major element geochemistry was used to estimate rock density, viscosity, liquidus …
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Recovery Strategies and Flow Modeling in Fractured Grosmont Carbonates with High Permeability Conduits
… its possibility to describe the multi-physical flow in both free flow fractures and porous matrix. The application range and validity of Brinkman-Stokes multi-physical flow on karstified carbonates are discussed.
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Temperature and heat flow modeling of three-dimensional bodies in a two-layered half space
… was made of steady-state temperature and heat flow anomalies in the earth's crust caused by contrasts in heat production and thermal conductivity. Exact expressions were derived for the temperature and heat flow anomalies caused by polygonal prism heat sources in a half space overlain by a …
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Dynamics of the North American Plate: Numerical Development, Mantle Flow Modeling, and Receiver Function Analysis
… potential to build a multi-scale global mantle flow model with a local high-resolution focus beneath the North America plate. Given the immature state of this new code for mantle flow modeling in 3-D spherical shell geometry at the beginning of my doctoral study, I first developed a new geoid …
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Geomorphic Assessment and Flow Modeling of Pearl Darter (Percina aurora) Habitat in the Pascagoula River Watershed
… River watershed. I then used HEC-RAS, a flow modeling program, to assess quantitative characteristics of Pearl Darter reproductive habitat, including sandbar morphology. We found that sandbar morphology differed between rivers of the same watershed, and Pearl Darter occurrence, and …
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