National Repository of Grey Literature 6 records found  Search took 0.01 seconds. 
Development of CFD solver for four-way coupled particle-laden flows
Šourek, M. ; Isoz, Martin
Computational uid dynamics (CFD) simulations containing freely moving bodies are still a challenging topic. More so, if the bodies are large enough to a_ect the uid ow and distributed\ndensely enough to come in contact both with the boundaries of the computational domain and with each other. In this work, we concentrate on the topic of simulation of (i) irregular bodies\nwith ow-induced movement and contact with computational domain boundaries taken into account, and (ii) bodies entrained by the uid and coming in contact not only with the domain\nboundaries but also with each other. The developed modeling approach is based on the hybrid _ctitious domain-immersed boundary method extended by the discrete element method. The\npresent contribution is focused on presentation of simulation principles and results of initial benchmark cases.
POD-DEIM-based model order reduction for four-way coupled fluid-solid flows
Isoz, Martin ; Šourek, M.
Proper orthogonal decomposition (POD) and discrete empirical interpolation method (DEIM) have become established tools for model order reduction in simulations of fluid flows. However, including moving solid bodies in the computational domain poses additional issues with respect to the fluid-solid coupling and to the solution of the movement of the solids. Still, it seems that if the hybrid ctitious domain-immersed boundary method is used to include the solids in the flow domain, POD-DEIM based approaches may be extended for four-way coupled particleladen flows. The present work focuses on the construction of POD-DEIM based reduced order models for the aforementioned flows.
Geometrically realistic macro-scale model for multi-scalesimulations of catalytic filters for automotive gasaftertreatment
Hlavatý, Tomáš ; Isoz, Martin ; Plachá, M. ; Šourek, M. ; Kočí, P.
This paper is part of a research focused on simulating (i) the catalytic conversion of environment endangering gases, and (ii) trapping of the particulate matter in automotive exhaust gas aftertreatment. Historically, the catalytic conversion and the filtration of soot particles were performed in independent devices. However, recent trend is to combine the catalytic converter and soot filter into a single device, the catalytic filter. Compared to the standard two-device system, the catalytic filter is more compact and has lower heat losses. Nevertheless, it is highly sensitive to the catalyst distribution. This study extends our recently developed methodology for pore-scale simulations of flow, diffusion and reaction in the coated catalytic filters. The extension consists of enabling data transfer from macro- to pore-scale models by preparing geometrically realistic macro-scale CFD simulations. The simulation geometry is based on XRT scans of real-life catalytic filters. The flow data from the newly developed macro-scale model are mapped as boundary conditions into the pore-scale simulations and used to improve the estimates of the catalytic filter filtration efficiency.
Logics transforming the urban waterfront in Bratislava unravelling the decision-making dynamics behind urban development
Machala, Branislav ; Sýkora, Luděk (advisor) ; Šuška, Pavel (referee) ; Šourek, Michal (referee)
Extended Abstract This thesis addresses the globalizing urban waterfront in Bratislava. It aims to unravel the key logics driving the decision-making processes behind waterfront re- development in the Slovak capital. I investigate the infiltration of the capitalist logics into a transforming institutional environment unfolding from the post-socialist transition. This is being done through a distinction between the capitalist and the territorial logics of power (Jessop, 1999; Harvey, 2005). Across the globe, waterfront re-development has become the urban response to inner-city decline, and the increasing inter-urban competitiveness in today's neoliberal capitalism. The origins of waterfront transformations are here framed as an urban manifestation of geographically uneven logics of capital put into motion by the crisis of Atlantic Fordism (Smith, 1990; Jessop, 2000). The capital switching into the build-up environment (Harvey, 1978; 2005), is temporarily fixed on urban waterfronts through decisions made on multiple scales (Brenner, 2001). Various types of 'extraverted' strategies such as the Ecosystem approach (Laidley, 2007), a construction of megaprojects & an organisation of mega-events (Orueta & Fainstein 2009), or localization of transnational circulations of stararchitects (Alaily-Mattar et.al. 2018),...
DEM-CFD study of flow in a random packed bed
Šourek, M. ; Isoz, Martin
Most catalytic surface reactions as well as other industrial applications take advantage of fixed packed bed reactors. Designers of these reactors rely mostly on empirical formulas derived for various simplifying assumptions, e.g. uniformly distributed porosity. The made simplifications and especially the assumption of uniformly distributed porosity fail if the tube to particle diameter ratio goes under 10 and the „wall effect“ becomes more significant. In such a case, the complete three-dimensional structure of the packed bed has to be considered. Thanks to ongoing improvements in numerical mathematics and computational power, the methods of computational fluid dynamics (CFD) have become a great tool for comprehensive description of the packed beds with low tube to particle diameter ratio. Three-dimensional simulations of the flow through two fixed beds differing in the type of the used particle are presented and compared with available experimental and empirical results. To generate the random fixed beds, we propose a custom approach based on the discrete element method (DEM) code implemented in open-source software Blender. Thereafter, OpenFOAM tools (snappyHexMesh, simpleFoam) are used for creation of the computational mesh and solution of the governing equations describing a single-phase flow in the packed bed.
Creating 3D training network.
ŠOUREK, Martin
Graduation theses is called Creating 3D Training Network. The thesis is divided into two main parts. The first part is theoretical and speaks about the creating of new 3D network and its surveying. Considering thesis{\crq}s size the theory is worked up factual for needfulness of that thesis. The theoretical knowledge were extract from accessible literature. The other part is practical. At this part I described the methodology of single works along with used machines and summary of calculations and outcomes of surveying. Concrete records of calculations, topography of new created points, overview of new created training network etc. are parts of appendices. The practical knowledge were obtained from literature, my knowledge and above all from the conslutations with the graduation theses{\crq}s supervisor. Graduation theses is aimed to creating of new 3D training network intended for education of Geodesy 1 and Geodesy 2 of branch Land Adjustment and Real Estate Trade.

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1 ŠOUREK, Martin
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