Određivanje ukupnog otpora kontejnerskog broda u naravi primjenom računalne dinamike fluida

undergraduate thesis

• Title (english): Determination of total resistance for a full-scale container ship using computational fluid dynamics
• Author: Marko Hunić
• Mentor: Nastia Degiuli (mentor)
• Mentor: Ivana Martić (komentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Shipbuilding; Hydromechanics of Floating and Maritime Structures

Abstract

U okviru ovog završnog rada provedene su numeričke simulacije s ciljem određivanja ukupnog
otpora kontejnerskog broda 6750 TEU u naravi, primjenom programskog paketa STAR-CCM+
za računalnu dinamiku fluida. Matematički model temeljen je na Reynoldsovim osrednjenim
Navier-Stokesovim jednadžbama uz primjenu 𝑘 − 𝜀 modela turbulencije. Za opis slobodne
površine korištena je metoda udjela fluida u volumenu. Analiziran je utjecaj gustoće mreže te
vremenskog koraka u postupku verifikacije, a dobiveni numerički rezultati validirani su
usporedbom s eksperimentalnim vrijednostima ekstrapoliranim primjenom metode ITTC-1978.
Pokazano je da je relativna devijacija ukupnog otpora pri svim razmatranim brzinama manja
od 5 %, što ukazuje na zadovoljavajuću razinu podudarnosti između numeričkih i
eksperimentalnih podataka. Istraživanje potvrđuje da je računalna dinamika fluida pouzdan alat
za predviđanje ukupnog otpora broda u naravi te može uvelike smanjiti potrebu za skupim
pokusima u bazenima za modelska ispitivanja.

Abstract (english)

Within this thesis, numerical simulations were carried out to determine the total resistance of a
6750 TEU container ship at full scale, using the STAR-CCM+ software package for
computational fluid dynamics. The mathematical model was based on the Reynolds averaged
Navier–Stokes equations with the application of the 𝑘– 𝜀 turbulence model. The volume of fluid
method was used to locate and track the free surface. The influence of mesh density and time
step was analyzed in the verification study, and the obtained numerical results were validated
by comparing them with experimental values extrapolated using the ITTC-1978 performance
prediction method. It was shown that the relative deviations of total resistance for all analyzed
speeds are lower than 5 %, indicating a satisfactory agreement between the numerical and
experimental data. The research confirmed that computational fluid dynamics is a reliable tool
for predicting the total resistance of a full-scale ship and can significantly reduce the need for
expensive model testing in towing tanks.

• Keywords: kontejnerski brod; ukupni otpor; računalna dinamika fluida; Reynoldsove osrednjene Navier–Stokesove jednadžbe; 𝑘– 𝜀 model turbulencije; metoda ekstrapolacije ITTC-1978
• Keywords (english): container ship; total resistance; computational fluid dynamics; Reynolds averaged Navier–Stokes equations; 𝑘– 𝜀 turbulence model; ITTC-1978 performance prediction method
• Language: croatian
• URN:NBN: urn:nbn:hr:235:596622
• Study programme: Title: Naval Architecture; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka brodogradnje (sveučilišni prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka brodogradnje)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-24 11:32:14