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CFD analysis of thermal stress of a tubesheet
Vince, Tomáš ; Babička Fialová, Dominika (oponent) ; Rebej, Miroslav (vedoucí práce)
This diploma thesis focuses on the phenomena of multiphase flow in a steam generator as a one of probable causes of tubes and tubesheet weld cracking. In the first part of the work, a research was carried out focusing on the boiling and the phenomenon of two-phase flow in technical applications, its characteristics and properties. The thesis continuous with an overview of available numerical multiphase models in the ANSYS Fluent 2021 R1 and a research of previously published works focused on two-phase flow with the presence of boiling. The research is followed by a description of the particular boiler, which is part of the nitric acid production plant in the chemical company DUSLO, a.s., its operating conditions and a more detailed description of the issue that is being addressed in this thesis. The second part of the work continuous with a description of the computational model, including a description of the geometry of the model and used simplifications, the computational mesh and the description of boundary conditions. Important part is the description of calculation setting of steady-state and transient CFD simulations in ANSYS Fluent. Finally, the results of the two-phase flow calculation are presented and then discussed in the conclusions.
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Numerická studie vlivu větrání na šíření škodlivých látek v prostoru učebny
Klusáček, Ondřej ; Prinz, František (oponent) ; Elcner, Jakub (vedoucí práce)
Diplomová práce se zabývá numerickou simulací vlivu větrání na šíření škodliviny v učebně pomocí programu STAR-CCM+. Cílem práce bylo vytvoření realistického 3D modelu učebny, zvolit vhodný model vícefázového proudění, zhodnotit šíření škodliviny při různých formách provozu a zvolit nejefektivnější způsobe větrání. Za použíti Lagrangeova modelu vícefázového proudění byla porovnávána objemová frakce škodliviny pro jednotlivé typy provozu. Numerické řešení bylo validováno pomocí experimentu provedeného v totožných prostorech a za stejných podmínek větrání. V práci jsou taktéž uvedena výsledná teplotní a rychlostní pole v učebně. Jako nejefektivnější ze zvolených metod se ukázala nucená ventilace. Pokud nakažený jedinec sedí blíže k oknům či dveřím, je nižší riziko nákazy v místnosti.
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CFD analysis of thermal stress of a tubesheet
Vince, Tomáš ; Babička Fialová, Dominika (oponent) ; Rebej, Miroslav (vedoucí práce)
This diploma thesis focuses on the phenomena of multiphase flow in a steam generator as a one of probable causes of tubes and tubesheet weld cracking. In the first part of the work, a research was carried out focusing on the boiling and the phenomenon of two-phase flow in technical applications, its characteristics and properties. The thesis continuous with an overview of available numerical multiphase models in the ANSYS Fluent 2021 R1 and a research of previously published works focused on two-phase flow with the presence of boiling. The research is followed by a description of the particular boiler, which is part of the nitric acid production plant in the chemical company DUSLO, a.s., its operating conditions and a more detailed description of the issue that is being addressed in this thesis. The second part of the work continuous with a description of the computational model, including a description of the geometry of the model and used simplifications, the computational mesh and the description of boundary conditions. Important part is the description of calculation setting of steady-state and transient CFD simulations in ANSYS Fluent. Finally, the results of the two-phase flow calculation are presented and then discussed in the conclusions.
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