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Alen Krunić, 2020, master's thesis

Abstract: Nowadays, traditional sources are mostly used for energy production, such as fossil and nuclear fuels. Such energy sources have a negative impact on the environment. As a result, trends in energy production are increasingly focused on renewable energy sources. These energy sources are available everywhere and their environmental impact is minimal. Nonetheless, these energy sources cannot be exploited with the same efficiency during the day (the Sun is not present the whole day, in winter, the sunlight days are shorter, the wind is not constant, etc.) or during different periods of the year. The variable amount of energy, produced from these sources and the integration with energy distribution systems, must not be overlooked. This is especially important in power plants, where it is necessary to ensure high energy reserves at excess load, which can be achieved by incorporating an improved energy storage system and higher efficiency of produced electricity. This process contributes to a significant reduction in costs. Direct energy storage systems, described in this master's thesis, are used in applications that require many fast charging and discharging cycles instead of a long-term energy storage in cars, buses, trains and lifts, where they are used for regenerative braking, short-term energy storage or as a primary source of electricity. Supercapacitors are electrochemical double-layer capacitors with low energy density and high power density. They have low series resistance, so they have the ability to emit high current, allowing them to charge quickly and a long lifespan. The goal of the thesis is to determine experimental parameters of supercapacitors and to compare them with theoretical parameters and batteries. With the simulation method of charge and discharge we have proven, that differences in results exists.
Keywords: storage, supercapacitor, application, modelling
Published: 02.03.2020; Views: 859; Downloads: 105
.pdf Full text (3,97 MB)

Numerical simulations of full-scale vehicles using PANS turbulence model
Jan Viher, 2019, master's thesis

Abstract: External aerodynamics plays an important role in improving road vehicles efficiency. In the field of computational fluid dynamics (CFD), relatively basic and often inaccurate turbulence models are typically used in the industry. In this work, the Partially-Averaged-Navier-Stokes (PANS) method is used to show its applicability for industrial purposes. An air flow past two distinct geometrical models has been simulated using AVL FIRE and results have been compared with available measurements. The results show that the accuracy is vastly improved in comparison with conventional turbulence models. In modern external aerodynamics applications, the PANS model has the potential to be more widely used.
Keywords: aerodynamics, PANS, full-scale, advanced modelling
Published: 28.11.2019; Views: 344; Downloads: 48
.pdf Full text (3,61 MB)

Analytical modelling of achieving energy efficiency with green walls
Dejan Tasić, 2019, master's thesis

Abstract: In the last years, energy efficiency has become an important issue for the EU and Slovenia, who both strive for more sustainable use of energy in buildings. As an innovative approach to such matter, green walls are vertical structures that can serve both as a façade or an insulation layer as well as an aesthetic design for building application. This thesis contains calculated annual heat (transmission) losses through different wall assemblies with and without a constructed green wall in front of them. The goal is to compare values of heat losses between those wall assemblies and the explanation of such results which will determine if green walls present a viable energy-efficient structure for buildings.
Keywords: energy efficiency, green wall, heat losses, modelling
Published: 18.11.2019; Views: 714; Downloads: 67
.pdf Full text (3,83 MB)

Raziskava buildingSMART IFC Bridge in evalvacija AllPlan Bridge na primeru informacijskega modela mostu Marija Gradec
Sebastijan Kelc, 2019, master's thesis

Abstract: V magistrskem delu je predstavljen projekt buildingSMART IFC Bridge, katerega rezultat je podatkovna shema IFC 4x2 Draft1. Osredotočili smo se na konceptualne sklope za mostove in preverili skladnost funkcionalnosti aplikacij Allplan in Allplan Bridge s shemo. V ta namen je bil izdelan informacijski model mostu M1 v Marija Gradcu. V zaključnem delu magistrske naloge so predstavljeni predlogi za izboljšave aplikacij Allplan Bridge in Allplan.
Keywords: IFC Bridge, bridges, Allplan Bridge, parametric modelling
Published: 11.10.2019; Views: 473; Downloads: 111
.pdf Full text (4,71 MB)

Systems methodology for strategic decision-making in complex healthcare system
Tadeja Jere Lazanski, 2017, original scientific article

Abstract: Systems methodology as a support for strategic decision- making will be discussed in the paper. A society will be presented as a complex system, which is comprised of many smaller, complex systems as its component parts. The healthcare system is one of them. The support to the strategic decision-making in a healthcare system will be shown through systems thinking and systems modelling. We will develop models of a healthcare system in frame of a systems dynamics; a qualitative causal loop diagram (CLD), which helps us to discuss the challenges categorically and a quantitative model, which is a simulation model. Both models illustrate the discussed methodology.
Keywords: systems methodology, healthcare system, strategic decision-making, systems thinking, modelling
Published: 09.10.2018; Views: 618; Downloads: 51
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Implementation and verification of a geosynthetic-soil interface constitutive model in the Geogrid element of FLAC$^{3D}$
Wu Haimin, Shu Yiming, Dai Linjun, Teng Zhaoming, 2015, original scientific article

Abstract: Due to the complexity of geosynthetic-soil interactions, the simple interface constitutive models embedded in the geosynthetic elements of general computing software cannot satisfy the requirements for a numerical simulation of different geosynthetic-soil interface behaviours. Based on the direct shear test results of a composite geomembrane (CGM) and polyurethane (PUR) mixed crushed stones interface, a nonlinear elastic, perfectly plastic model was used to describe the interface behaviours. The method of incorporating an interface constitutive model into the Geogrid element of a fast Lagrange analysis of continua in three dimensions (FLAC3D) procedure was presented in detail through a user-defined program in the FISH environment. Then the incorporated model of the Geogrid element was used to simulate the direct tests of the CGM-PUR mixed crushed stones interface. The results of the numerical tests confirmed the validity and reliability of the incorporated model. The method and program flowchart for implementing the nonlinear elastic, perfectly plastic interface constitutive model into the Geogrid element can provide a reference for users who want to simulate other geosynthetic-soil interface behaviours with FLAC3D.
Keywords: geosynthetic-soil interface, constitutive model, numerical modelling, FLAC3D, geogrid element
Published: 14.06.2018; Views: 571; Downloads: 38
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Lessons learnt from field tests in some potentially unstable slopes in Switzerland
Sarah Springman, Armin Askarinejad, Francesca Casini, Sven Friedel, Peter Kinzler, Philipp Teysseire, Andrea Thielen, 2012, original scientific article

Abstract: Rain-induced slope instability is a significant natural hazard in Switzerland, Slovenia and elsewhere in Europe. This contribution was prepared especially for the 12th Šuklje Symposium, and recognises that landslides occur both in mountain regions as well as in lowland regions during and following extreme-rainfall conditions. The Institute (and Professorship) for Geotechnical Engineering at the Swiss Federal Institute of Technology (ETH Zürich) has been engaged over several years in projects concerned with the characterisation, monitoring and modelling behaviour of slopes in mainly granular porous media across the full range of altitudes in Switzerland. A link is made to the doyen of the Šuklje day and then three case histories are presented and discussed to demonstrate the principal reactions to seasonal rainfall. A small slip was released in two of these cases and the “triggering” factors have been investigated and are discussed in this contribution. It transpires that the mode of inslope drainage influences the way in which the ground saturates and hence the volume of the potentially unstable ground. Simple stability analyses using limit equilibrium and soil parameters that have been amended to account for unsaturated soil behaviour were found to function well for slopes in largely granular media.
Keywords: rain-induced landslides, slope stability, case histories, monitoring, characterisation, modelling
Published: 13.06.2018; Views: 381; Downloads: 41
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A coupled thermo-hydro-mechanical model of expansive clays subjected to heating and hydratation
Nadia Laredj, Hanifi Missoum, Karim Bendani, Mustapha Maliki, 2011, original scientific article

Abstract: The focus of this work is to provide a numerical formulation for coupled thermo-hydro-mechanical processes in unsaturated expansive clays, especially in compacted bentonite, with a multiphase fluid flow. The model is characterized by the presence of a deformable solid matrix filled with two fluid phases (liquid water and air). In the proposed model, both pore-water and air transfers are assumed to be governed by the generalized Darcy’s law. Fully coupled, nonlinear partial differential equations are established and then solved by using a Galerkin weighted residual approach in the space domain and an implicit integrating scheme in the time domain. The model has been validated against an experimental test from the literature, which involves bentonite under laboratory conditions. The calculated relative errors between the experimental and numerical results are 3% for the temperature and 7% for the stresses. Consequently, the developed numerical model predicts satisfactory results, when compared to the experimental test measures. The model is applicable to two-dimensional problems with various initial and boundary conditions; non linear soil parameters can be easily included in this model.
Keywords: thermo-hydro-mechanical process, unsaturated bentonite, finite element, numerical modelling, expansive clays
Published: 13.06.2018; Views: 369; Downloads: 32
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Prediction of the pile behaviour under dynamic loading using embedded strain sensor technology
Andrej Štrukelj, Mirko Pšunder, Helena Vrecl-Kojc, Ludvik Trauner, 2009, original scientific article

Abstract: A standard dynamic loading test of the pile was performed on the highway section Slivnica - Hajdina near Maribor, Slovenia. Parallel to standard testing procedures the new monitoring technology based on specially developed strain sensors installed inside the pile body along the pile axis was introduced. On the basis of the measured results the normal strains along the pile axis were measured. Taking into consideration the elastic modulus of the concrete the normal stresses in the axial direction of the pile were also calculated and afterwards the shear stresses along the pile shaft have been estimated as well as the normal stresses below the pile toe. The estimation was made by considering a constant value for the pile diameter. The measured results were also compared with the computer simulation of the pile and the soil behaviour during all the successive test phases. The strain measurements inside the pile body during the standard dynamic loading test in present case did not have the purpose of developing an alternative method of pile loading tests. The presented monitoring technology proved itself as a very accurate and consistent. It gave in the first place the possibility of a closer look at the strains and stresses of the most unapproachable parts of different types of concrete structure elements especially piles and other types of deep foundations.
Keywords: piles, deep foundations, dynamic loading test, strain measurement technologies, elasto-plastic modelling, finite-element method
Published: 06.06.2018; Views: 448; Downloads: 47
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