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Numerical modeling of free ions movement
Sukup, Luboš ; Steinbauer, Miloslav (referee) ; Fiala, Pavel (advisor)
This work deals of movement free ions in environment, which is affected by acting of electric field, magnetic field and their interacting. In first part is work focused on numerical methods, which solve exemplars situations. Here is important to properly choose adequate numerical method. Second part of this work interprets influence of these fields on the ions and influence of environment on final motion. The last experimental part is focused on model of cylindrical capacitor as a sensor, which models nonuniform electric field.
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Numerical Modelling of Flow over Spillway
Holinka, Matouš ; Hodák,, Jiří (referee) ; Jandora, Jan (advisor)
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.
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Static analysis of arch bridge structure
Farkasová, Zuzana ; Zídek,, Rostislav (referee) ; Hradil, Petr (advisor)
The main task of the Bachelor´s thesis is to do a static analysis of arch bridge construction with two span and bridge deck hanged on pulled cables. My task was to construct numerical model of bridge construction, to make load solution and to evaluate results. I have learned about ANSYS programme during processing this thesis, especially about its working environment WORKBENCH.
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Mathematical modelling of wind waves
Bendová, Gabriela ; Golík, Pavel (referee) ; Jandora, Jan (advisor)
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.
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Design and assessment of the timber dome
Hušek, Martin ; Zídek, Rostislav (referee) ; Brdečko, Luděk (advisor)
The subject of the bachelor thesis is design and assessment of the timber dome. The opening chapters are devoted to design geometry of dome itself with focus on its modification for the purpose of the shape and structure optimizing. The following chapters describe the structural design details and overall attitude to the issue. The final chapters value custom design structures, compare alternatives and provide answers to questions formed in the thesis.
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Shear bearing capacity of composite slabs
Holomek, Josef ; prof. Ing. Alois Materna, CSc., MBA (referee) ; Keršner, Zbyněk (referee) ; Bajer, Miroslav (advisor)
The subject of the submitted work is the experimental and theoretical investigation of composite slabs. The work also deals with creation of numerical models of composite slabs. The design of a new type of steel sheeting for composite slab according to nowadays standards requires full scale laboratory bending tests. An alternative to the bending tests are the small scale shear tests. The small scale shear tests as well as corresponding design methods have already been investigated by many researchers. Therefore several test arrangements and corresponding design methods can be found in literature but none of them is included in standards yet. The submitted thesis describes three of the alternative design methods: Slip- Block Test, Simplified Method and Built-up Bars. The test arrangement is proposed to be usable in all these methods. The small scale shear test have been performed in laboratory in several modifications. The results were used to calculate the bending resistance of the slab by the alternative design methods. The calculated bending resistances were mutually compared, compared with the performed bending tests resistances and the resistances by the methods described in Eurocode: m-k method and partial connection method. A sensitivity studies of the input parameters in alternative design methods are presented as well. The optimal design method for use in practice was searched and recommended based on the performed studies, accuracy and laboriousness of the methods. The shear tests were used also to measure longitudinal shear resistance of the additional shear anchors. The alternative design methods were used to predict bending resistance of the slab using these anchors and the results were compared. The numerical simulation of the composite action of the slab by the finite element methods is modelled in Atena software. The models serves to perform parametrical studies and to better understand of the behaviour of the slab in partial composite action.
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Analysis of precast walls made of plain concrete and lightly reinforced concrete
Janda, Miloslav ; Lavický, Miloš (referee) ; prof. ing. Jan L. Vítek, CSc. (referee) ; Zich, Miloš (advisor)
This dissertation analyses precast walls made of plain concrete and lightly reinforced concrete. The main focus is on evaluating the concrete and the reinforcement of precast concrete wall panels in relation to manufacturing, handling, and final phases. The dynamic load component of panels during handling was measured in controlled tests. Shrinkage measurement was implemented during the maturing process of the concrete used for panel manufacturing. The value of cohesion was observed between the reinforcement and the concrete that had matured for 20 hours. It was also looked at the value of adhesive strength between the panel surface and the casting table. The experimental study checked the panel strain during removal from the casting table, the panel compression during a truck ride over an obstacle, and the tension in the carriage strap during panel transportation to the building site. Mathematical formulas were drawn up to validate the concrete and reinforcement of wall panels made of lightly reinforced concrete. Those mathematical formulas were applied in a specific panel wall design and the results were verified by nonlinear numerical models.
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Effect of an exhaust opening location on air quality in an apartment
Charvát, Tomáš ; Forman, Matěj (referee) ; Krejčí, Vladimír (advisor)
This thesis deals with the influence of the location of exhaust outlets on the air quality. The study examines the performance of the hybrid ventilation system installed in an experimental house. The central point of this work is a numerical model of a bedroom with heat and carbon dioxide sources. The temperature, speed and concentration fields have been solved for, from which further quantities of thermal comfort PMV, PPD and DR were evaluated. Finally, the impact of changes in the quality of the microclimate using these quantities and in the energy efficiency ventilation is assessed.
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Verification of interaction between the foundation plate and the pile
Kozáková, Marcela ; Hrubešová,, Eva (referee) ; Turček,, Peter (referee) ; Horák, Vladislav (advisor)
The doctoral thesis deal with the interaction between the foundation plate and deep foundation in the form of bored piles in the case of skeleton construction. The issue of tension redistribution from the column between the plate and the pile is investigated on specific object – „Shopping and entertainment center Fórum Nová Karolina”. On this object were selected columns monitored and load tests of the piles was executed. Values of the axial loading of the piles and the actual deformation of the construction have been derived from measurements and tests. They were compared with the results of structural behavior by numerical modeling.
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