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master's thesis
Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida
2019. urn:nbn:hr:157:263744
Daić, Aleksandra
University of Rijeka
Faculty of Civil Engineering

Cite this document

Daić, A. (2019). Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida (Master's thesis). Rijeka: University of Rijeka, Faculty of Civil Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:157:263744

Daić, Aleksandra. "Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida." Master's thesis, University of Rijeka, Faculty of Civil Engineering, 2019. https://urn.nsk.hr/urn:nbn:hr:157:263744

Daić, Aleksandra. "Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida." Master's thesis, University of Rijeka, Faculty of Civil Engineering, 2019. https://urn.nsk.hr/urn:nbn:hr:157:263744

Daić, A. (2019). 'Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida', Master's thesis, University of Rijeka, Faculty of Civil Engineering, accessed 21 January 2025, https://urn.nsk.hr/urn:nbn:hr:157:263744

Daić A. Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida [Master's thesis]. Rijeka: University of Rijeka, Faculty of Civil Engineering; 2019 [cited 2025 January 21] Available at: https://urn.nsk.hr/urn:nbn:hr:157:263744

A. Daić, "Hidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida", Master's thesis, University of Rijeka, Faculty of Civil Engineering, Rijeka, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:157:263744

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Metadata
TitleHidraulička analiza kuglastih zatvarača primjenom Računalne dinamike fluida
Title (english)Hydraulic analysis of ball valves using Computational Fluid Dynamics
AuthorAleksandra Daić
MentorElvis Žic (mentor)
MentorLuka Lešnik (komentor)
VIAF: 60154440108235340784
Committee memberNino Krvavica (predsjednik povjerenstva)
Committee memberJosip Rubinić (član povjerenstva)
Committee memberElvis Žic (član povjerenstva)
GranterUniversity of Rijeka
Faculty of Civil Engineering
Rijeka
Defense date and country2019, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Civil Engineering
Hydrotechnology
Abstract
Strujanje fluida u cijevnom sustavu moguće je kontrolirati primjenom zatvarača. Mogu se definirati kao vrsta uređaja u sustavu koji se koriste za pokretanje/zaustavljanje, kontrolu ili usmjerenje fluida. Kuglaste zatvarače možemo opisati kao tip zatvarača koji za kontrolu protoka koriste kuglu koja se rotira. U radu se analizira protok fluida kroz kuglasti zatvarač kao dio cijevnog vodoopskrbnog sustava. Strujanje može biti opisano kao turbulentno koje uzrokuje pojavu vrtloga. Oni se smatraju nepovoljnom pojavom u vodoopskrbnom sustavu, sa mogućnošću uzrokovanja oštećenja zatvarača ili cijevi. Mjerenjem određenih veličina moguće je detektirati područje na kojem će doći do njihove pojave. Cilj ovoga rada je na temelju dobivenih veličina odrediti prethodno spomenuto područje. U tu svrhu se koriste principi Računalne dinamike fluida (eng. Computational Fluid Dynamics, CFD), koja podrazumijeva modeliranje i numeričke metode. CFD kvantitativno predviđa što će se dogoditi prilikom protjecanja određenog fluida. Hidrauličke analize u ovome radu su provedene u Ansys CFX 19.1 kompjuterskom programu, koji koristi Navier-Stokesove jednadžbe, Metodu konačnih volumena i k-ε model turbulencije kao temelj numeričkog modeliranja. Provedene su četiri različite varijante, ovisno o promjeni geometrije (promjer cijevi), kutu rotacije kuglastog zatvarača i vrijednosti ulazne brzine. Dobiveni rezultati prikazani su promjenama sljedećih fizikalnih veličina: brzina, relativni i ukupni tlak, vrtložna viskoznost i kinetička energija turbulencije. Uspoređivanje ovih rezultata daje nam uvid u formiranje vrtloga i njihove moguće efekte na cijevni vodoopskrbni sustav.
Abstract (english)
Fluid flow in piping system it's possible to control using valves. They are components in system that are used to start/stop, control or direct fluid. Ball valves can be described as type of valves that use a perforated rotary ball in order to control the flow. This graduate thesis analyzes the fluid flow through a ball valve that is part of water supply piping system. Fluid flow can be described as turbulent flow which causes the appearance of vortices. They are considered as harmful occurence in the water supply system, which can cause the damage of valve or pipe. By measuring certain quantities, it is possible to detect the area of vortice's appearance. The aim of this graduate thesis is to determine the previous mentioned area, based on obtained values. For that purpose, the principles of Computational Fluid Dynamics can be used, which consider modeling and numerical methods. CFD is quantitatively predicting what will happen when certain fluid flows. This paper's hydraulic analysis is performed in Ansys CFX 19.1 computer program, which uses Navier-Stokes equations, Finite Volume Method and k-ε turbulence model as the basis of numerical modeling. There are four different variants implemented, depending on change in geometry (pipe diameter), ball valve rotation angle and inlet velocity value. The obtained results show changes in the following physical quantities: velocity, relative and total pressure, eddy viscosity and turbulence kinetic energy. Comparing those results gives us an insight into the vortices formation and it's possible effects on piping system.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:157:263744
ProjectNumber: RC.2.2.06-0001
Title: Razvoj istraživačke infrastrukture na kampusu Sveučilišta u Rijeci
Leader: Nevenka Ožanić
Jurisdiction: Croatia
Funder: EFRR, MZO
Study programmeTitle: Civil Engineering; specializations in: Geotechnical Engineering, Hydraulic Engineering, Engineering Modelling, Structural Engineering, Transportation Engineering, Urban Engineering
Course: Hydraulic Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka građevinarstva (magistar/magistra inženjer/inženjerka građevinarstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
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Created on2019-10-09 13:01:20