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Quantitative comparison of used mesh for CFD software ANSYS Fluent
Koudelková, Kateřina ; Klas, Roman (referee) ; Štefan, David (advisor)
Creating a good computational mesh is one of the crucial activities in any CFD calculation. CFD software aim to make a mesh generation as simple and automated as possible, due to its time-demanding nature. ANSYS Fluent has introduced a tool for partially automatic mesh generation, a method called Mosaic mesh, which should ensure that the best type of mesh element is used in each part of the geometry for optimal results. Polyhexcore is the latest computational mesh generation method used by Mosaic mesh technology. This thesis aims to compare the Polyhexcore mesh with other types of computational meshes on an aerodynamic test problem.
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Modelling of Flow over Spillway of the Letovice Dam
Škrach, Mikuláš ; Holomek, Petr (referee) ; Jandora, Jan (advisor)
The thesis is concerned on numerical modeling of a scheduled spillway on water structure Letovice. The goal of the thesis is to verify hydraulic calculation using numerical modeling and to verify the capacity of the spillway. The spacial model was created in SketchUp program and the numerical modeling was implemented in Flow-3D program. The reason to recalculate the spillway is its reconstruction and extension in order to make high a capacity of it in the final project of Letovice water structure whole reconstruction.
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Parametric Generator of Heat Exchanger Tube Bundle Mesh for OpenFOAM
Petrů, Martin ; Juřena, Tomáš (referee) ; Turek, Vojtěch (advisor)
This thesis deals with the basics of computational fluid dynamics (CFD), the reasons for its use, and the related necessity to create computational meshes. The next part of the thesis focuses on assessing the quality of computational meshes and, briefly, on computational methods of CFD. The available mesh generators are also compared, and an overview of meshing capabilities is provided. The following is basic information about the OpenFOAM software and its capabilities, in particular the creation of meshes using the blockMesh application. The following part of the thesis is focused on the description of the developed application and its functions for generating a high-quality computing mesh of a tube bundle heat exchanger for the OpenFOAM software. In conclusion, a steady flow simulation verifies the correctness of the created mesh and its sufficient quality.
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Flow modelling for applications in process industry
Bialožyt, Michal ; Jegla, Zdeněk (referee) ; Hájek, Jiří (advisor)
Tato diplomová práce se zabývá vlivem zjednodušené geometrie na výpočet pomocí počítačového modelování proudění. Konkrétně se jedná o možnost náhrady části trubky porézní vrstvou, která má odpovídající tlakovou ztrátu jako nahrazený úsek. Řešen je také přestup tepla a jeho vliv na proudění a tlakovou ztrátu. Jako nejúčinnější řešení se ukázalo zakomponování vlivu přestupu tepla na tlakovou ztrátu do porézní vrstvy. Toto řešení nevyžaduje použití rovnice energie a je tudíž nejméně výpočetně nákladné. Získané poznatky jsou poté testovány na modelu reálného výměníku tepla, který má problémy se zanášením a distribucí proudu. Náhrada porézní vrstvou se ukázala jako spolehlivé řešení. Dalším bodem práce je testování závislosti výpočtu turbulentního difúzního spalování na jemnosti výpočetní sítě. K tomuto účelu byl využit model spalovací komory. Po prvním výpočtu byla výpočetní síť, na základě výsledků, zjemněna v oblasti vířiče a v oblasti plamene, kde dochází k největším gradientům. Po adaptaci výpočetní sítě bylo dosaženo téměř dvojnásobného počtu buněk a výpočet byl opakován. Výpočet s adaptovanou výpočetní sítí se ukázal být mnohokrát časově náročnější a byl proto zastaven jelikož přesahuje rámec této práce. Předběžné výsledky byly zpracovány.
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CFD simulation flow of steam in the unregulated extraction of steam turbine
Filip, Patrik ; Pospíšil, Jiří (referee) ; Fiedler, Jan (advisor)
Diploma thesis named CFD simulation of the steam flow in the unregulated extraction of the steam turbine is about an analysis of the balance piston impact on the area of the steam turbine, where the extraction is located. First part describes basic knowledge of the steam turbine in general. At the end of this chapter, there is a description of the solved steam turbine. Next chapter is about introduction to the CFD. Practical part deals with a construction of 3D models, meshing and setting of the boundary conditions in the program ANSYS CFX. The main part of this thesis summarizes the results of the CFD simulation and stipulates the temperature range on the extraction pipe. In conclusion, there is a recommendation how to determine design temperature of the extraction pipe influenced by the balance piston.
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Simplified computer models of elements for an air distribution
Mishuk, Aliaksandra ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
The goal of this master thesis is to create a simplified model of an actual swirl diffuser using CFD (Computational Fluid Dynamics) simulation, so that it would be easy to calculate (would have a simple geometry, a proper mesh and would enable quick definition of the model’s boundary conditions) and would also create an airflow pattern in space as close to reality as possible. In the process a CFD model with a certain geometry was created. Subsequently, various model settings were tested. Calculation results were compared with the results of the experimental measurement done using the PIV method.
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