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master's thesis
Numerička karakterizacija brodskog propelera
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. urn:nbn:hr:235:498992
Šeb, Borna
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Šeb, B. (2017). Numerička karakterizacija brodskog propelera (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:498992

Šeb, Borna. "Numerička karakterizacija brodskog propelera." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:498992

Šeb, Borna. "Numerička karakterizacija brodskog propelera." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:498992

Šeb, B. (2017). 'Numerička karakterizacija brodskog propelera', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 07 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:498992

Šeb B. Numerička karakterizacija brodskog propelera [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2017 [cited 2024 November 07] Available at: https://urn.nsk.hr/urn:nbn:hr:235:498992

B. Šeb, "Numerička karakterizacija brodskog propelera", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:235:498992

Metadata
TitleNumerička karakterizacija brodskog propelera
Title (english)Numerical characterisation of a ship propeller
AuthorBorna Šeb
MentorHrvoje Jasak (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2017-03-31, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Marine Mechanical Engineering
Abstract
Napretkom računalne tehnologije računalne metode u dinamici fluida (RDF) postale su dostupne za korištenje u inženjerskoj praksi pa tako i za odred̄ivanje hidrodinamičkih značajki brodskog vijka. U ovom radu ispitivane su tri metode simulacije eksperimenta slobodne vožnje brodskog vijka: • simulacija jedne lopatice brodskog vijka metodom višestrukih referentnih koordinatnih sustava (eng. "Multiple Frames of Reference", skraćeno MRF), • simulacija cijelog brodskog vijka u MRF pristupu, • tranzijentna simulacija brodskog vijka. U svrhu evaluacije pojedine metode, rezultati svake od simulacija su uspored̄eni s eksperimentalnim podacima kako bi im se odredila točnost te su med̄usobno uspored̄ene obzirom na potrebne računalne resurse. Pokus slobodne vožnje služi kako bi se izračunale radne karakteristike potrebne prilikom projektiranja brodskog vijka. Med̄utim, izvedba pokusa ne uzima u obzir interakciju izmed̄u strujanja brodskog vijka i krme broda koja je bitna za odred̄ivanje propulzijskih značajki broda. U tu svrhu izvodi se eksperiment vlastitog pogona kod kojeg je model brodskog vijka ugrad̄en na model krme. RDF simulacija pokusa vlastitog pogona iznimno je skupa jer zahtijeva visoku prostornu i vremensku rezoluciju. Korištenje grublje prostorne i vremenske rezolucije moguće je ako se brodski vijak u takvim simulacijama modelira teorijom idealnog propelera. Takvo pojednostavljenje može u velikoj mjeri smanjiti računalne troškove. U ovom radu provedena je evaluacija modela idealnog vijka koja je izvedena usporedbom rezultirajućeg polja strujanja s poljem strujanja dobivenim iz simulacije oko geometrije brodskog vijka.
Abstract (english)
Due to the rapid development of computer technology Computational Fluid Dynamics (CFD) have become a viable tool for hydrodinamic analysis of ship propellers. The open water test for the propeller, traditionally performed to obtain the characteristics used in design, is often simulated with the CFD methods. In this thesis three different CFD methods for simulating the open water test are evaluated based on their accuracy and computational time. They are respectively: • multiple frames of reference (MRF) for a single blade passage with periodic boundary conditions, • MRF for complete propeller geometry, • transient simulation with a rotating mesh and complete propeller geometry. For some naval applications the interaction between the propeller and ship flows has to be resolved correctly. Solving the flow around the exact propeller geometry in such simulations can be extremely demanding in terms of CPU requirements, which sometimes makes them unfeasible. As an alternative, it is preferred to define an actuator disc region at the location of the propeller at which the momentum transferred from the propeller to the fluid is modelled. In this thesis the open water characteristics from the resolved propeller geometry are used for modelling the propeller influence on the flow with the actuator disc approach. The performance of the actuator disc is afterwards evaluated against the CFD results for the actual propeller geometry.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:235:498992
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-05-22 19:27:41