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undergraduate thesis
Numeričko istraživanje pojave interferencije kod katamarana
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2022. urn:nbn:hr:235:736467
Tomljenović, Ivan
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

Tomljenović, I. (2022). Numeričko istraživanje pojave interferencije kod katamarana (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:736467

Tomljenović, Ivan. "Numeričko istraživanje pojave interferencije kod katamarana." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2022. https://urn.nsk.hr/urn:nbn:hr:235:736467

Tomljenović, Ivan. "Numeričko istraživanje pojave interferencije kod katamarana." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2022. https://urn.nsk.hr/urn:nbn:hr:235:736467

Tomljenović, I. (2022). 'Numeričko istraživanje pojave interferencije kod katamarana', Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 25 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:736467

Tomljenović I. Numeričko istraživanje pojave interferencije kod katamarana [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2022 [cited 2024 December 25] Available at: https://urn.nsk.hr/urn:nbn:hr:235:736467

I. Tomljenović, "Numeričko istraživanje pojave interferencije kod katamarana", Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:235:736467

Metadata
TitleNumeričko istraživanje pojave interferencije kod katamarana
Title (english)Numerical investigation into the interference phenomenon for a catamaran
AuthorIvan Tomljenović
MentorNastia Degiuli (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2022-02-03, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Shipbuilding
Hydromechanics of Floating and Maritime Structures
Abstract
U ovom radu provedeno je numeričko određivanje ukupnog otpora, trima i urona modela jednotrupnog broda i katamarana Delft 372 primjenom računalne dinamike fluida (eng. Computational Fluid Dynamics - CFD) s ciljem istraživanja utjecaja pojave interferencije na ukupni otpor katamarana. Numeričke simulacije provedene su primjenom komercijalnog programskog paketa STAR-CCM+. Matematički model temeljen je na Reynoldsovim osrednjenim Navier - Stokesovim jednadžbama (eng. Reynolds Averaged Navier - Stokes - RANS) uz primjenu k - ω SST (eng. Shear Stress Transport) modela turbulencije. Za potrebe provedbe numeričkih simulacija, primijenjen je model nestacionarnog, trodimenzijskog, viskoznog strujanja, dok je za praćenje i lociranje slobodne površine primijenjena metoda udjela fluida u volumenu (eng. Volume of fluid - VOF). Numeričko istraživanje provedeno je za tri vrijednosti Froudeovih brojeva: 0,3; 0,5; 0,75 te za dva razmaka između trupova katamarana, što je omogućilo ispitivanje utjecaja razmaka između trupova i Froudeovog broja na pojavu interferencije. Provedena je verifikacija dobivenih numeričkih rezultata te je izračunata nesigurnost mreže i vremenskog koraka pri određivanju otpora modela jednotrupnog broda i katamarana Delft 372. Nadalje, provedena je i validacija rezultata usporedbom dobivenih numeričkih rezultata s eksperimentalnim rezultatima dostupnim u literaturi. Pokazano je da je ukupni otpor katamarana veći od dvostruke vrijednosti otpora jednotrupnog broda, što ukazuje na pojavu nepovoljne interferencije pri ispitanim Froudeovim brojevima i razmacima između trupova. Konačno, pokazano je kako se računalna dinamika fluida može primijeniti kao koristan alat u istraživanju pojave interferencije.
Abstract (english)
In this study numerical assessment of the total resistance, trim, and sinkage of monohull and Delft 372 catamaran model is performed using Computational Fluid Dynamics (CFD), to investigate the impact of interference phenomenon on the total resistance of a catamaran. Numerical simulations are carried out using the commercial software package STAR-CCM+. The mathematical model is based on Reynolds Averaged Navier-Stokes (RANS) equations and k-ω SST (Shear Stress Transport) turbulence model. Unsteady three-dimensional viscous flow is numerically simulated, and the Volume of Fluid (VOF) method is utilised for tracking and locating free surface. Numerical investigations are carried out at three Froude number values: 0.3, 0.5, and 0.75 and for two demihull separations, which enabled the investigation of the impact of demihull separation and Froude number on the interference phenomenon. The verification study is performed and grid and temporal uncertainties for the prediction of the total resistance of monohull and catamaran Delft 372 model are calculated. Thereafter, the validation study is carried out by comparison of the numerically obtained results with the experimental ones available in the literature. It has been shown that the total resistance of the catamaran is higher than the double total resistance of the monohull, which demonstrates the occurrence of the detrimental interference at investigated Froude numbers and demihull separations. Finally, it has been demonstrated that Computational Fluid Dynamics can be used as a valuable tool in the investigation of interference occurrence.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:736467
Study programmeTitle: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering
Course: Engineering Modelling and Computer Simulation
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2022-03-02 11:00:46