|
|
Analysis of Flow Distribution in Systems with Dense Tube Bundles
Babička Fialová, Dominika ; Dohnal, Miloslav (referee) ; Turek, Vojtěch (advisor)
Considering heat transfer equipment with dense tube bundles, it is essential to ensure as uniform a fluid distribution into the tubes as possible in order to prevent various operating problems. This bachelor’s thesis therefore focuses on tube-side flow analysis in such equipment. CFD simulations were carried out using a diverse set of flow systems with outflow into a constant-pressure environment. The respective tube bundle geometries differed in densities and sizes, arrangements of the tubes, and tube diameters. Air was used as the working fluid in the majority of the cases, however, some of the simulations were also carried out with water. Data obtained from evaluations in the fluid flow modelling software ANSYS Fluent were further analysed and the influence of the mentioned differentiating parameters on flow distribution non-uniformity and pressure drop was investigated. According to the regression model, the dependence of flow distribution non-uniformity on density and size of the bundle and on mass flow rate per unit outflow area cannot be rejected with the standard significance level. As for pressure drop, the only parameter that was not rejected was mass flow rate per unit outflow area.
|
|
|
Numerical simulation of the flow in the components of the hydraulic circuit
Broža, Martin ; Moravec, Prokop (referee) ; Kozák, Jiří (advisor)
The bachelor thesis is focused on the analysis of the possibilities Autodesk Simulation CFD with simulation of flow in the hydraulic circuit elements. It is a commercial program applied in solving water flow in the selected elements of the hydraulic circuit, in elbow, sudden enlargement and 90 degree sharp elbow. The obtained results are compared with experimental results from laboratory and the results obtained by the ANSYS FLUENT.
|
|
| |
|
|
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.
|
|
|
Methods for determining aerodynamic properties of vehicles
Páleš, Patrik ; Blaťák, Ondřej (referee) ; Čavoj, Ondřej (advisor)
The aim of the bachelor’s thesis is a description of methods being used for measurements of aerodynamic characteristics of automobiles. The exact determination of the aerodynamic characteristics requires sophisticated testing equipment and advanced engineering procedures. The research comprises several approaches. Computational fluid dynamics (CFD) is based on turbulent models application such as RANS, LES and DNS. Pressure distribution on a vehicular body surface and an air flow along the vehicle are monitored in wind tunnels. Flow visualization is carried out by optical (PIV, LDA) and non-optical methods. Experimental road testing methods are focused on multiple parameters including a vehicle directional stability, its cross-wind sensitivity, engine cooling system and many others.
|
|
|
Design optimization of water-cooled thermocouple probe
Dohnal, Miloslav ; Vondál, Jiří (referee) ; Hájek, Jiří (advisor)
The object of this bachelor’s thesis is to create a computational model of an existing (basic) structure water-cooled thermocouple probe, to calculate and evaluate the quality of existing cooling probe and to propose possible design modifications to improve the cooling effect of the probe tip. Verify and evaluate design modifications by further calculation. The calculation will be carried out using computational fluid dynamics (CFD method). On the contrary, the aim of this work is not to create another text tool for students dealing with CFD topics. The first part describes the meaning and history of the CFD methods, then mentions the work on the principle of thermocouple probes and its application in practice. The second part of the work is devoted to problem solving. It describes the reason for the introduction of model situations when calculating the cooling effect of thermocouple probes and calculation indicates what type of flow occurs inside the thermocouple probe. It further describes the results of calculations for several approximations gradually increasing accuracy of the resulting solution of the problem and assessing the quality of cooling in the probe tip current (basic) structure. The final part deals with design changes for better cooling effect especially in the probe tip, which is verified by further calculation as well.
|
|
| |
|
|
Using SolidWorks for model preparation in CFD
Švaňhal, Radek ; Klas, Roman (referee) ; Rudolf, Pavel (advisor)
This bachelor’s thesis objective is to analyze utilization of program SolidWorks for preparing CFD (Computational Fluid Dynamics) models. First part describes the process of modelling a finite volume of a Francis turbine rotor. Also, the most useful functions and modelling procedures are presented. Second part analyzes pros and cons of using SolidWorks for CFD model preparation. In the last part the model is imported to pre-processor Gambit where meshing tools and procedures are introduced. In conclusion the thesis summarizes the main benefits of using a stand-alone specialized CAD software for CFD modelling.
|
|
|
Air condition of the restaurant
Král, Tomáš ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
This thesis describes the creation of ventilation systems in the specified restaurant. The pur-pose of this investigation is to design the air conditioning system so as to create the optimal microclimate conditions in all operating parts of the building; such as a kitchen, restaurant, social hall or an apartment. I will use available computer software and adhere to the applica-ble regulations and standards. Using computer simulations, I will assess the current status of the air distribution in respective parts of the building and propose its optimization, which in turn will provide an optimal internal microclimate.
|
|
| |
guest ::
