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Numerical modelling of radiative heat transfer and tabulated chemical kinetics in multiphase reactive processes
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Filip Jurić Radiative heat transfer plays a significant role in total heat transfer in industrial systems
that operate at high temperatures. Therefore, this research aims to develop and implement a
new model for calculating the radiative absorption coefficient that considers the radiative
spectral properties of the medium. The discrete ordinates model for control volumes will be
applied to solve the radiative transfer equation. The proposed model will be validated using
analytical results...
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Numerical modelling of spray and combustion processes using the Euler Eulerian multiphase approach
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Zvonimir Petranović The goal of this thesis is to develop advanced engineering method for numerical modelling of highly turbulent multiphase combustion processes. The first objective was to use the commercial 3D Computational Fluid Dynamics (CFD) code FIRE® and model real engineering system by changing various combustion parameters. In this section, the spray process was modelled by employing the widely used Euler Lagrangian discrete Droplet Method (DDM). The focus was to gain insight into advantages and...
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Numerical modelling of the effects of biofouling on ship resistance and propulsion characteristics
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Andrea Farkas The effect of biofouling on the hydrodynamic characteristics of ship resistance and propulsion
in calm water is very important from both an economic and environmental point of view.
Hydrodynamic performance of a ship is disrupted because of the presence of biofouling
organisms, which results in increased fuel consumption, ship speed reduction and increased
emission of harmful gases. Presently, there is no comprehensive procedure, which could
reliably predict the effect of biofouling on...
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Numerical modelling of turbulent premixed jet flames in large eddy simulation framework
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Luka Perković The main topic of this work's research is obtaining the methodological framework for large eddy simulation of turbulent premixed combustion. Obtaining this framework implies good knowledge of the state-of the-art in LES combustion, understanding the sub-grid scale (SGS) modelling of combustion and turbulent transport, proper definition of boundary conditions, quality mesh generation and proper numerical setup. In this work two different approaches have been used for SGS modelling of...
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Numerical phase-field modeling of damage in heterogeneous materials
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Karlo Seleš Material failure is still one of the central issues in modern engineering. Its prediction and prevention are being tackled early in the product design stage. Materials used in modern engineering often exhibit significant microstructural heterogeneity. The size, shape, distribution and properties of microconstituents considerably influence the heterogeneous material properties. Nowadays, numerical simulations play an essential role in component design and material development, gradually...
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Numerical phase-field modelling and experimental validation of sintered steel fracture and fatigue behaviour
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Zoran Tomić In order to achieve reliable behaviour assessment of heterogeneous materials on
macroscale it is necessary to numerically and experimentally model material behaviour on the
microscale. The porosity and heterogeneity in fracture mechanics are often considered as
defects which decrease the mechanical properties. Usually, such defects are micro-, or even
nanoscopic, but significantly decrease material properties, depending on their amount and
location.
In recent decade, the powder...
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Numerical simulation of lubricated wire rolling and drawing
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Vanja Škurić A numerical framework for simulation of lubricated contact between two rough
surfaces in metal forming simulations is presented in this work. The framework
is implemented as a contact condition for the hyperelastoplastic finite volume
deformation solver within the foam–extend software package, a community driven
fork of the open source OpenFOAM software.
The main features of the model are: calculation of film thickness, hydrodynamic
pressure and shear stress of the lubricant,...
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Numerical simulation of metal materials quenching by applying Eulerian two-fluid model
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Alen Cukrov A novel approach for the solution of mass transfer within the framework of the multi-fluid model supplemented with the Volume of Fluid (VOF) method, i.e. two-fluid VOF, is presented in this thesis. The governing equation set is comprised of mass, momentum, and energy conservation equations, written on a per-phase basis and supplemented with closure models via the source terms. In our method, the heat and mass transfer are calculated from the heat transfer coefficient, which has a fictitious...
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Numerically efficient modelling of turbulent non-premixed flames
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Mario Baburić A pre-tabulated chemistry approach, based on premixed and non-premixed laminar flamelets, was developed and implemented in this work. A devoted software application was developed in order to perform the chemistry calculations and tabulations in the preprocessor step. The combustion modelling in CFD procedure consisted of calculating the field distribution for a set of tracking scalars – mixture fraction and reaction progress variable – while the chemistry composition space was...
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Numerička i eksperimentalna studija sunčevog kolektora s valovitim apsorberom
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Damir Dović U prvom dijelu rada dani su izrazi i postupak proračuna izmjene topline u pločastom kolektoru sunčevog zračenja s cijevnim registrom i u pločastom kolektoru bez cijevi. Koristeći taj proračun provedene su simulacije rada ispitanih cijevnih kolektora varirajući rane konstrukcijske parametre. Temeljem tim putem dobivenog uvida u utjecaj pojedinog parametra na toplinske karakteristike, razvijeni su razni numerički modeli za simulaciju izmjene topline u cijevnom i kolektoru bez cijevi....
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Numerička metoda za analizu strujanja fluida na nestruktuiranoj mreži
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Ivo Džijan U radu je razvijen računalni program za analizu dvodimenzijskog turbulentnog strujanja fluida. Program se temelji na metodi konačnih volumena na lokalno ortogonalnoj nestrukturiranoj geometrijskoj mreži u kojoj se brzine i tlakovi računaju u istim čvorovima (nepomaknuta mreža). U korištenoj lokalno ortogonalnoj mreži je svaka stranica konačnog volumena okomita na spojnicu susjednih čvorova i dijeli ju na dva jednaka dijela. Definirane su dvije varijante metode konačnih volumena. U...
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