This thesis deals with mathematical modelling of water flow through the safety object. It explains the principle of mathematical modelling and its laws. There is also present-ed the mathematical models used by numerical modelling. The results of mathemati-cal model Koryčany are included in this thesis compared with hydraulic calculations and physical model.

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This research extends the capabilities of Non-oscillatory Forward-in-Time (NFT) solvers operating on unstructured meshes to allow for accurate simulation of incompressible turbulent flows. This is achieved by the development of Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) turbulent flow methodologies and the development of parallel option of the flow solver. The effective use of LES and DES requires a development of a subgrid-scale model. Several subgrid-scale models are implemented and studied, and their efficacy is assessed. The NFT solvers employed in this work are based on the Multidimensional Positive Definite Advection Transport Algorithm (MPDATA) that facilitates novel implicit Large Eddy Simulation (ILES) approach to treating turbulence. The flexibility and robustness of the new NFT MPDATA solver are studied and successfully validated using well established benchmarks and concentrate on a flow past a sphere. The flow statistics from the solutions are compared against the existing experimental and numerical data and fully confirm the validity of the approach. The parallel implementation of the flow solver is also documented and verified showing a substantial speedup of computations. The proposed method lays foundations for further studies and developments, especially for exploring the potential of MPDATA in the context of ILES and associated treatments of boundary conditions at solid boundaries.

Submitted by Liliane Ferreira (ljuvencia30@gmail.com) on 2018-07-09T15:51:41Z No. of bitstreams: 2 Dissertação - Jeferson Silva Martins - 2018.pdf: 4962348 bytes, checksum: 7da8c895b4929a650a07c2381fc59290 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-07-10T11:07:38Z (GMT) No. of bitstreams: 2 Dissertação - Jeferson Silva Martins - 2018.pdf: 4962348 bytes, checksum: 7da8c895b4929a650a07c2381fc59290 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-07-10T11:07:38Z (GMT). No. of bitstreams: 2 Dissertação - Jeferson Silva Martins - 2018.pdf: 4962348 bytes, checksum: 7da8c895b4929a650a07c2381fc59290 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-05-17 / This paper presents the Mixed-Model Flow Line problem for Production Scheduling. Production problems have been vastly studied given their usability in all kind of assembly lines and its production in the industry worldwide. The problem processes jobs grouped by families in stations of machines seeking for the best sequencing the families can provide to be produced in the processing time (Makespan). In this work, a bibliographic review was performed to support the study, looking different methods and problems that encompass the Mixed-Model Flow Line in the literature showing its importance towards the industrial and scientific environment. The Mixed-Model Flow Line problem was solved through optimization techniques: An integer lienar programming inGUROBI, Lagrangian Relaxation and Genetic Algorithm. The processing times and demands are randomly generated for each instance. Finally, the results obtained in the techniques used for the problem were compared to each other. / Este trabalho apresenta o problema de Flow Line Misto para a Programação da Produção em Scheduling. Problemas da produção tem sido vastamente estudado dada sua usabilidade em todo o tipo de linha de montagem e produção na indústria mundial. O problema em estudo considera o processamento de tarefas em conjuntos por meio de estações de máquinas buscando um bom sequenciamento das tarefas a serem produzidas melhorando o tempo de processamento (Makespan). Neste trabalho, uma revisão bibliográfica foi realizada para fundamentar o estudo encontrando diferentes métodos e problemas que englobam o Flow Line Misto mostrando a importância deste estudo no meio industrial e científico. O problema do Flow Line Misto foi resolvido por meio de técnicas de otimização, sendo elas um modelo de programação linear inteira resolvido pelo GUROBI, no Lagrangeano Relaxado e no Algoritmo Genético com tempos de processamento e demandas gerados aleatoriamente para as instâncias criadas. Por fim, os resultados obtidos nas técnicas analisadas para o problema foram comparados entre si.

Significant maldistribution negatively influences performance of equipment containing dense tube bundles and, moreover, it can cause a wide range of operating issues. This thesis therefore focuses on analysis of fluid flow in complete distribution systems via computational fluid dynamics (CFD). Data obtained from simulations carried out using the software ANSYS Fluent were also statistically analysed. Influence of system arrangement, tube bundle parameters and operating parameters on flow distribution non-uniformity and pressure drop was investigated. According to the results, system arrangement is the crucial differentiating parameter in terms of flow distribution as well as pressure drop. Additionally, data obtained via the classical CFD approach were compared with those yielded by a simplified CFD model for three selected distribution systems. Simplified CFD approach can - given its low computational demand - be utilised in optimization algorithms as well as in the course of the initial stage of equipment design process. Furthermore, this thesis discusses a simulation tool which is based on the simplified CFD approach. Although this tool is still being developed, the results it yields are very promising.

The purpose of the dissertation thesis is to prepare transport techno-economic models which will be able to estimate the transportation cost for selected scenarios. The main goal is to describe the complex transport chains in waste management, using different types of transportation (road, rail) and transport different types of waste. The key element of preparing techno-economic models is the identification of input parameters which are important for estimating the cost of transport. At the same time, it is necessary to correctly identify the processing facilities that will be part of complex transport chains. The total outputs will be presented in the form of a feasibility study.

This thesis deals with the solution of numerical modeling. Consequently problems associated with the flow of the water over spillway of the specific water structure. In this case numerical modeling means modeling of fluid movement, which is described by mathematical means. Especially nowadays, when a lot of spillways need to be recalculated, whether it meets the capacity demands, or there is no need to tackle reconstruction. With today's software capabilities there is a wide range of commercial and freeware resources. The numerical model, compared to physical model is less accurate which is, on the otherhand, physical model is usually financially and time-consuming. The following work simulates the behavior of water on the edge of the spillway, in the trough and then behind the trough. The result is a comparison of the water depth in the trough calculated by the numerical and the physical model.

<p>U okviru ovog rada je razvijen ravanski model koji sadrži sve važne aspekte interakcije vode, nanosa i zagađivača u prirodnim vodotocima. Model obuhvata procese<br />strujanja vode, oba oblika kretanja nanosa (suspendovani i vučeni), mehanizme<br />razmene mase između nanosa u suspenziji i nanosa u aktivnom sloju, deformacije korita usled erozije i deponovanja nanosnog materijala, mehanizme razmene<br />mase između nanosa u aktivnom sloju i aktivnom stratumu, kao i procese transporta nekonzervativne zagađuju&acute;ce materije koja je u interakciji sa nanosom preko<br />procesa adsorpcije/desorpcije. Formulisane jednačine transporta zagađivača obuhvataju njegovu pojavu u rastvorenom i adsorbovanom obliku. Razmena između<br />dva vida pojave zagađivača (rastvoreni i adsorbovani) je opisana preko kinetickih<br />procesa prvog reda, pri cemu je modelisanje koeficijenata razmene usko povezano<br />sa dostupnom povrˇsinom za adsorpciju. Sa druge strane, razmena između materije<br />adsorbovane na suspendovani nanos, odnosno materije adsorbovane na nanos u aktivnom sloju je neposredno vezana za nanosne procese uvlačenja zrna u suspenziju i<br />deponovanja istih iz suspenzije. Početni &scaron;ematski testovi su podrazumevali proveru<br />razvijenog algoritma za re&scaron;avanje advektivnih članova jednačina. Druga grupa &scaron;ematskih testova je podrazumevala implementaciju razvijenog modela transporta<br />zagađujuće materije, pri čemu su testirani i kvalitativno ocenjeni mehanizmi<br />razmene i interakcije. Za testiranje modela na primerima aluvijalnih vodotokova<br />izabrane su dve deonice reke Dunav. Prva lokacija se nalazi u pograniˇcnoj zoni<br />između Mađarske i Srbije gde su testirani aspekti modela koji se odnose na<br />proracun tečenja i pona&scaron;anje nanosa. Druga deoncia se nalazi kod Beograda<br />gde je, pored proračuna strujanja i nanosa, vr&scaron;ena analiza modela transporta zagađujuće materije obuhvatajući sve relevantne mehanizme i aspekte izučavanih<br />procesa. Upoređivanjem terenskih merenja i rezultata proračuna je konstatovano<br />da razvijeni model može simulirati interakciju vode, nanosa i zagađivača u prirodnim vodotocima sa zadovoljavajucom tačno&scaron;ću i pouzdano&scaron;ću.<br />&nbsp;</p> / <p>This work presents the development of a two-dimensional model for flow, sediment<br />and pollutant interaction in natural watercourses. The model incorporates water<br />flow computation, both aspects of sediment transport (suspended and bed-load),<br />the mechanisms of exchange between suspended and bed sediment, bed evolution<br />due to erosion and deposition, the mechanisms of exchange between active layer<br />and active stratum sediment, as well as the processes of nonconservative pollutant<br />transport including its interaction with sediment particles by adsorption/desorption.<br />Deriving the governing equations for pollutant transport included the dissolved and<br />adsorbed pollutant. The exchange between the dissolved and adsorbed pollutant<br />was described using a first order kinetic process, while the modeling of the exchange<br />coefficients remained closely related to the sediment surface available for adsorption.<br />On the other hand, the exchange between the pollutant adsorbed on suspended sediment and the pollutant adsorbed on active layer sediment was directly related<br />to the sediment processes of entrainment and deposition. Numerical tests included<br />the evaluation of the developed algorithm for advection terms. The second group<br />of numerical tests targeted the pollutant transport model, with the emphasis on<br />the mechanisms of exchange and interaction. For field test cases two reaches of the<br />Danube River were used. The first reach was located in the border area between<br />Hungary and Serbia. Field data collected there was used to analyze the developed<br />model&rsquo;s ability to simulate flow and sediment transport. Data collected on the second reach near Belgrade was used to perform flow, sediment and pollutant transport<br />simulations, taking into account all the relevant mechanisms of the studied processes.<br />Comparing the computed and measured values, it was concluded that the developed<br />model is able to simulate the interaction of flow, sediment and pollutant in natural<br />watercourses with acceptable precision and reliability.</p>

The work deals with mathematical modeling of wind waves on water reservoirs and their effects on different types of slopes. The research work was carried out using a vast array of available literature written on this topic in the Czech Republic and partly abroad. And we also deal with the hydrodynamics problems, creating mathematical and numerical model Further simulations were created in two numerical models. Simulations were created in two programs FLOW-3D and DualSPHysics. Vast variety of situations was created in DualSPHysics program because it seems more appropriate for modeling of this situation. It was created twenty-seven simulations and their results are compared with results coming from valid Czech standard ČSN 75 0255.