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Numerical Modelling of Flow over Spillway in Small Dams
Vaněk, Jakub ; Roth, Tomáš (referee) ; Jandora, Jan (advisor)
The master´s thesis deals with the numerical modeling of flow in the emergency spillways of small dams. It is solved the flow rate capacity of a weir and of spillway called „duckbill-type“. Sharp crested weirs and long crested weirs are modeled using numerical simulations in ANSYS. Hydraulically complex spillway called „duckbill-type“ was modeled in the Flow-3D. The results of the discharge coefficients are compared with data in the hydraulic literature.
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Analysis of rear wing elements for Formula student
Kaspar, Štěpán ; Hájek, Tomáš (referee) ; Popela, Robert (advisor)
Main objective of this bachelor thesis is to perform analysis of rear wing of the Formula student car and based on these information create design of new wing. The beginning of the thesis deals with Formula student competition rules, usage of rear wing in motorsport with main aim within this competition. Analysis and following optimization based on response surface methodology using CFD simulations in Ansys Fluent software, for which was performed calibration of computational model and mesh independence study.
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Optimizing of a hydraulic part of a cooling system of a hot-air slide valve
Melecký, Josef ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
Master´s thesis deals with hydraulic optimisation of a hot blast gate valve. The valve must be cooled down, because of very high temperature that is exposed to. The existing cooling system is oversized and uneffective. This gave opportunity to create a brand new system, that would lower operating expenses. The first part of the thesis is dedicated to comparsion between both systems from the point of the total pressure loss. The second part of the thesis deals with hydraulic optimisation of the new system. Computations are modelled in CFD.
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Bladeless fan cooling module
Šišpera, Adam ; Vacula, Jiří (referee) ; Bazala, Jiří (advisor)
Tato diplomová práce se zaměřuje na prozkoumání možností implementace bezlopatkového modulu ventilátoru založeného na Coanda efektu v chladícím systému osobního vozidla. Jejím cílem je prozkoumat proveditelnost takového řešení, jeho provozní charakteristiky a stanovit soubor doporučení pro návrh konkrétního designu. Vhodný chladící modul je navržen, následně hlouběji testován a jeho funkčnost je ověřena také reálným experimentem.
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Numerical investigation of transport and deposition of fibrous aerosol in simplified model of respiratory system
Masood, Usman ; Bělka, Miloslav (referee) ; Elcner, Jakub (advisor)
Rigid particles such as fiber particles, asbestos or MMMFs (man-made mineral fibers) are harmful to human health when inhaled because of their abundance in the atmosphere, composition, and ability to penetrate deep into human lungs. It can cause lung cancer and numerous other diseases according to the severity of the exposure. To address this inhalation phenomenon and complex maneuvers of these hazardous particles, it is vital to monitor their behaviour such as the nature of their transport, deposition, and trajectory which they attain during the inhalation conditions. Many previous studies regarding particle transport and deposition in human respiratory airways involved spherical particles, however, this research includes non-spherical thin and elongated particles in computational domain. Therefore, STAR CCM+ software is used to conduct this research and initial boundary conditions are taken from the preliminary experiments done by Lizal Frantisek and other researchers at Brno University of Technology, they assembled a test rig to visualize the motion of glass fibers through a replica of human airways. Fibers exhibit different aerodynamic behavior than spherical particles, causing different deposition patterns. To investigate this phenomenon, a computational fluid dynamics simulation setup is constructed in Simcenter STAR CCM+ using a model of the human airway. The discrete element method (DEM) is used because this is an extension of lagrangian approach (LA), which deals with discrete particle parcels and solves the equation of motion to determine the trajectory as they move through time and space as well as it deals with particle shape and collision behaviour. Based on the simulations, particle deposition in the respiratory tract model is studied and its results are analyzed.
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Study of the Gas Blow-by through the Turbocharger Sealing System
Požár, Vladimír ; Novotný, Pavel (referee) ; Vacula, Jiří (advisor)
The work focuses on the investigation of gas flow within the sealing system of a turbocharger, specifically in the compressor section. The sealing „piston” ring located here is the main subject of the study, primarily examining the influence of the ring's geometry and its positioning in the shaft groove on gas leakage into the bearing housing. Furthermore, the behavior of this flow under various boundary conditions is assessed by testing different flow types.
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CFD analysis of Formula student in turn motion
Derka, David ; Hostinský, Vladimír (referee) ; Popela, Robert (advisor)
Formula Student is a student competition, where there are new racing cars developed each year. The goal is to minimize lap time which can be done by well developed aerodynamic packet, which allows to generate downforce and allows the car to go faster through corners. This thesis analyzes steady-state cornering of specific car using CFD. First, the cornering theory is described and then the process of CFD simulation. Results show imperfections of the current aerodynamic packet and possible solutions are proposed.
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Analysis of rear wing elements for Formula student
Kaspar, Štěpán ; Hájek, Tomáš (referee) ; Popela, Robert (advisor)
Main objective of this bachelor thesis is to perform analysis of rear wing of the Formula student car and based on these information create design of new wing. The beginning of the thesis deals with Formula student competition rules, usage of rear wing in motorsport with main aim within this competition. Analysis and following optimization based on response surface methodology using CFD simulations in Ansys Fluent software, for which was performed calibration of computational model and mesh independence study.
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Optimizing of a hydraulic part of a cooling system of a hot-air slide valve
Melecký, Josef ; Kárník, Jan (referee) ; Štigler, Jaroslav (advisor)
Master´s thesis deals with hydraulic optimisation of a hot blast gate valve. The valve must be cooled down, because of very high temperature that is exposed to. The existing cooling system is oversized and uneffective. This gave opportunity to create a brand new system, that would lower operating expenses. The first part of the thesis is dedicated to comparsion between both systems from the point of the total pressure loss. The second part of the thesis deals with hydraulic optimisation of the new system. Computations are modelled in CFD.
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Numerical Modelling of Flow over Spillway in Small Dams
Vaněk, Jakub ; Roth, Tomáš (referee) ; Jandora, Jan (advisor)
The master´s thesis deals with the numerical modeling of flow in the emergency spillways of small dams. It is solved the flow rate capacity of a weir and of spillway called „duckbill-type“. Sharp crested weirs and long crested weirs are modeled using numerical simulations in ANSYS. Hydraulically complex spillway called „duckbill-type“ was modeled in the Flow-3D. The results of the discharge coefficients are compared with data in the hydraulic literature.
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