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Vortical structures with cavitating core
Švaňhal, Radek ; Štigler, Jaroslav (referee) ; Rudolf, Pavel (advisor)
The master's thesis focuses on vortical structures with cavitating core, which might develop in Francis turbines at non-optimal discharges in a form of unstable vortex cord. The cavitating vortex core is to be generated in a lab by flow rotation and a convergent nozzle. The objective of this thesis is to compare experimental results with mathematical model of pressure drop in vortical flow and with numerical calculation in Fluent based on finite volumes method. Other objective is to messure high frequency pressure vibrations generated by cavitating vortex core and spectrally analyze the data.
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Design systems used in the field of electrical apparatuses
Stejskal, Jiří ; Krejčí, Jan (referee) ; Valenta, Jiří (advisor)
Bachelor´s thesis is engaged on the base of submitter´s requests company OEZ, s.r.o. and is divided into two parts. The first part of work deals with the most often used 2D CAD systems that are used by designers according to their answers in the area of suggestion of electric switchboards low voltage. In the work are described main possibilities of these systems, then what kinds of data format are supported by them. In the second part of the work are described programs established on calculation of warming switchboards. It goes about programs, which supply concrete producer of switchboard case, and further programs based on method of final elements and method of final volume, which enable graphic representation of results.
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Simulation and determination of permanent pressure loss for the normalized orifice plate
Šimberský, Michal ; Uher, Miroslav (referee) ; Šedivá, Soňa (advisor)
This master’s thesis deals with the simulation of flow through the normalized orifice plate. There is described flow measurement with flowmeters, which reduces the cross-section of the pipe and causes the pressure difference before and after the flowmeter. Following is a description methods of modeling of turbulent flow and a description of software for the simulation of flow from the company Ansys. The theoretical part is followed a practical part, which is focused on determining the permanent pressure loss caused by the orifice plate and the verification of straight pipeline lengths between orifice and obstacle.
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CFD analysis of the airflow for the different types of flowmeters
Drexler, Pavel ; Štohl, Radek (referee) ; Šedivá, Soňa (advisor)
There are some basic information about pressure sensors and flow in the first part of my diploma thesis. For example turbulent and laminar flow, construction of pressure sensors and basic information abaut Ansys and –Fluent. Main part of this thesis is focused on CFD simulation of pressure and velocity in the vicinity of pressure sensors. I confront this simulated values with measured values in final part of this thesis.
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Virtual modelling of computional domain for CFD simulations
Volek, Matěj ; Naď, Martin (referee) ; Dohnal, Miloslav (advisor)
This thesis is devoted to open-source software for meshing in CFD simulations. In the opening chapter, there is introduced the computational modeling of fluid, briefly described governing equations and an introduction to the discretization of computational domain. The second chapter deals with the available mesh software. The programs are described in this chapter from the perspective of the user interface, the ability to create meshes, etc. The last chapter, there is a comparison of two selected programs on a real problem. In both programs was created a mesh which was calculated in the software Fluent. Then the calculation results are compared.
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Free surface flow in a swirl separator
Chára, Zdeněk ; Kysela, Bohuš
The paper is focused on the numerical solution of the flow in a separator of the swirl geometry with the free water level. Together with the numerical simulations results of the first experimental series are shown, too. Measured shapes of the free surface levels are compared with the numerical simulations in a dependency of different conditions of discharge inlets and outlets. ANSYS Fluent 6.3 was used for the numerical simulations and ANSYS Gambit 2.4 was used for the mesh design.
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Úprava počítačové mříže a výběr interpolačního schématu při řešení supersonického míchání proudícího prostředí
Jirásek, Vít
The injection of diluted iodine into the supersonic flow of helium was studied by means of CFD software Fluent. The computational grid was subsequently adapted, i.e. refined in the selected regions with large gradients of different defined quantities. A sensitivity of the refinement on the local and far-field solution was obtained. A sensitivity of the flowfield on the replacement of the first order interpolation scheme to the second order one in several combinations of solved equations was done. An influence of the increasing the interpolation scheme order on the far-field was found, dependent on the way of combination of the 1st and 2nd orders in selected equations interpolation.
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