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Boeije, C.S. (author), Verweij, C.B. (author), Zitha, P.L.J. (author), Pluymakers, Anne (author)The long-term performance of the reservoir is essential in order to ensure competitive life-cycle cost of the geothermal installations. Geothermal fluids are often saturated with gasses such as CO2 and N2. With their extraction from the reservoir, pressure and temperature decrease towards the extraction well. This disturbs the state of...conference paper 2022
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Zitha, P.L.J. (author), Guo, H. (author)Capillary forces result in the trapping of the oleic phase in porous media even after extensive flushing with brine. Alkali-surfactant-polymer formulations drastically diminish capillary forces, whereas adding polymer to the water phase increases viscous forces, resulting in highly efficient extraction of the residual oil. However, by virtue...journal article 2022
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Vural, Asya (author)The porous medium equation $\dv{t}u=\dv{x}(k(u)\dv{x}u)$ is a non-linear degenerate parabolic partial differential equation. Consequently, existence and uniqueness of its solutions is not immediately evident.<br/>This bachelor thesis presents a detailed discussion of Atkinson's and Peletier's 1971 article ``Similarity profiles of flows through...bachelor thesis 2021
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Teruna, C. (author), Manegar, F.A. (author), Avallone, F. (author), Ragni, D. (author), Casalino, D. (author), Carolus, T. (author)Open-cell porous materials have been reported as a promising concept for mitigating turbulent boundary-layer trailing-edge noise. This manuscript examines the aeroacoustics of a porous trailing edge to study its noise reduction mechanisms. Numerical investigations have been carried out for a NACA 0018 aerofoil with three different types of...journal article 2020
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Tang, J. (author), Castañeda, Pablo (author), Marchesin, Dan (author), Rossen, W.R. (author)Understanding the interplay of foam and non-aqueous phases in porous media is key to improving the design of foam for enhanced oil recovery and remediation of aquifers and soils. A widely used implicit-texture foam model predicts phenomena analogous to cusp catastrophe theory: the surface describing foam apparent viscosity as a function of...journal article 2019
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Sokolova, Irina (author)We propose a multiscale finite volume method (MSFV) for simulation of coupled flow-deformation in heterogeneous porous media under elastic deformation (i.e., poroelastic model). The fine-scale fully resolved system of equations is obtained based on a conservative finite-volume method in which the displacement and pore pressure unknowns are...master thesis 2018
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De, S. (author), Koesen, S. P. (author), Maitri, R. V. (author), Golombok, M. (author), Padding, J.T. (author), van Santvoort, J. F.M. (author)We compare the flow behavior of viscoelastic surfactant (VES) solutions and Newtonian fluids through two different model porous media having similar permeability: (a) a 3D random packed bed and (b) a microchannel with a periodically spaced pillars. The former provides much larger flow resistance at the same apparent shear rate compared to the...journal article 2018
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Boitcov, Dmitrii (author)Existing multiscale solvers use a sequence of aggressive restriction, coarse-grid correction and prolongation operators to handle low-frequency modes on the coarse grid. High-frequency errors are resolved by employing a smoother on the fine grid. Deflation preconditioning improves matrix properties, i.e., damps slowly varying errors,...master thesis 2017
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Postma, T.J.W. (author)Over the past decade, a steep increase in the number of seismic events has been observed in the Groningen gas producing region of the Northern Netherlands. It is generally accepted that these are induced by compaction of the reservoir rock due to extensive field depletion, causing a buildup of strain energy which may be released seismically when...master thesis 2017
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Kaltsas, D. (author)The pressuremeter test is one of the most popular in-situ soil testing methods. Developed in the 1950s in France, the test has evolved throughout the past decades and was built into a cone resulting in a cone pressuremeter device (CPM). A proposed extension of the test involves time dependent pressurisation of the device resulting in wave...master thesis 2016
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Farajzadeh, R. (author), Bedrikovetsky, P. (author), Lotfollahi, M. (author), Lake, L. W. (author)Physical adsorption and mechanical entrapment are two major causes of polymer retention in porous media. Physical adsorption is considered an equilibrium process and is often modeled by assuming a Langmuir isotherm. The outcome is a steady state pressure response because the permeability reduction is also accounted for by adsorption. However,...journal article 2016
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Castelletto, N (author), Hajibeygi, H. (author), Tchelepi, HA (author)The demand for accurate and efficient simulation of geomechanical effects is widely increasing in the geoscience community. High resolution characterizations of the mechanical properties of subsurface formations are essential for improving modeling predictions. Such detailed descriptions impose severe computational challenges and motivate the...journal article 2016
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Wang, Y. (author), Hajibeygi, H. (author), Tchelepi, H.A. (author)The MultiScale Finite Volume (MSFV) method is known to produce non-monotone solutions. The causes of the non-monotone solutions are identified and connected to the local flux across the boundaries of primal coarse cells induced by the basis functions. We propose a monotone MSFV (m-MSFV) method based on a local stencil-fix that guarantees...journal article 2015
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Van der Neut, E.M. (author)When designing a rubble mound breakwater, one would like to predict the stability of the armour layer of the breakwater. For this purpose several armour layer stability formula are developed. The most reliable is considered to be the stability formula of Van der Meer (1988). With this method, the armour layer stability is predicted based on...master thesis 2015
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Blokker, N.C.M. (author)Alginate-like exopolysaccharides (ALE) can be extracted from granular sludge, which is produced during aerobic granular sludge waste water treatment as a waste product. Processing the waste is a costly operation. It is believed that ALE consist mostly of alginates. The chemical and mechanical properties of alginates are potential for the...master thesis 2014
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Khoshnevis Gargar, N. (author)Using conventional production methods, recovery percentages from oil reservoirs range from 5% for difficult oil to 50% for light oil in highly permeable homogeneous reservoirs. To increase the oil recovery factor, enhanced oil recovery (EOR) methods are used. We distinguish EOR that uses chemical methods, (partially) miscible methods and thermal...doctoral thesis 2014
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Fan, H. (author)Natural or hydraulic fractures are of major importance for the productivity of hydrocarbon reservoirs. Besides fracture detection, also the aperture and extension of the fractures are essential for a correct reservoir productivity estimate. There are many ways to detect and measure fractures, such as borehole televiewers and electrical borehole...doctoral thesis 2014
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Ukrainczyk, N. (author), Koenders, E.A.B. (author)Coupled reactive-transport processes in cementitious materials play a crucial role in the aging process pf building materials. Up to now, the effect of aging on microstructure and evolution of it’s properties, in three dimensions, was studied only by dissolution of certain phases at random locations. In this paper we present a new 3D reactive...conference paper 2014
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Eftekhari, A.A. (author)This thesis evaluates the possibility of using underground coal gasification with a low CO2 footprint. The thesis consists of two parts. In the first part, by using the concept of exergy, a framework was constructed through which the practicality (feasibility) of an energy conversion/extraction method can be systematically evaluated. This...doctoral thesis 2013
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Janmahomed, F.R. (author)The Stochastic Bubble Population (SBP) model invented in 2006 by Prof. Dr. Zitha has been improved to take in account for the oil presence in the porous medium through which foam flows. The assumptions of the SBP model are that foam flow in porous media is a complex fluid and bubble generation is a stochastic process. The SBP model is a simple...bachelor thesis 2013