Numerička simulacija pokusa vlastitog pogona kontejnerskog broda

master's thesis

• Title (english): Numerical simulation of self-propulsion test for containership
• Author: Dominik Pribanić
• Mentor: Nastia Degiuli (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-12-04, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Shipbuilding

Abstract

U ovom radu provedene su numeričke simulacije pokusa otpora broda, pokusa slobodne vožnje brodskog vijka te pokusa vlastitog pogona primjenom računalne dinamike fluida (RDF) koristeći komercijalni programski paket STAR-CCM+. Numeričke simulacije provedene su za DTC (Duisburg Test Case) brod i brodski vijak u naravi. Generirana je proračunska domena te je provedena diskretizacija primjenom konačnih volumena. Postavljeni su rubni uvjeti te fizikalne postavke numeričkih simulacija. Nestacionarno strujanje viskoznog fluida modelirano je Reynoldsovim osrednjenim Navier-Stokesovim (RANS) jednadžbama uz primjenu realizable k-ɛ i k-ω SST modela turbulencije. Slobodna površina opisana je primjenom metode udjela fluida u volumenu (eng. Volume of Fluid, VOF). Numeričke simulacije pokusa vlastitog pogona provedene su primjenom „Virtual disk“ i „Body force“ metoda, a pokusa slobodne vožnje primjenom metode višestrukih referentnih koordinatnih sustava (eng. Moving Reference Frame, MRF). U numeričkim simulacijama uz stijenku broda i brodskog vijka primijenjene su zidne funkcije. Verifikacija je provedena za numeričku simulaciju pokusa otpora pri čemu je analizirana gustoća geometrijske mreže i veličina vremenskog koraka. Dobiveni rezultati numeričkih simulacija pokusa otpora, pokusa slobodne vožnje i pokusa vlastitog pogona validirani su eksperimentalnim rezultatima dostupnim u literaturi ekstrapoliranim na brod u naravi. Pokazano je da se numeričkim simulacijama može ostvariti zadovoljavajuća točnost.

Abstract (english)

In this thesis numerical simulations of resistance, open water and self-propulsion test are carried out using computational fluid dynamics (CFD) with the commercial software package STAR-CCM+. Numerical simulations are carried out for the full-scale DTC (Duisburg Test Case) ship and the propeller. Within the software package, computational domain is generated and its discretization is performed using finite volume method. The boundary conditions and physical settings of numerical simulations are set. The unsteady flow of viscous fluid is modeled using the Reynolds Averaged Navier-Stokes (RANS) equations utilizing realizable k-ɛ and k-ω SST turbulence models. The free surface is described using the Volume of Fluid (VOF) method. Numerical simulations of the self-propulsion test are performed using the Virtual disk and Body force methods, while the numerical simulations of the open water test are performed using the Moving Reference Frame (MRF) method. In the numerical simulations wall functions are applied along the wall of the ship and the propeller. The verification study is performed for the numerical simulations of the resistance test where the grid size and the time step are analyzed. The obtained results of the numerical simulations of resistance, open water and self-propulsion tests are validated with the experimental results available in the literature extrapolated to full-scale ship. It has been shown that satisfactory accuracy can be achieved by numerical simulations.

• Keywords: računalna dinamika fluida (RDF); pokus otpora; pokus slobodne vožnje; pokus vlastitog pogona; RANS; realizable k-ɛ; k-ω SST
• Keywords (english): computational fluid dynamics (CFD); resistance test; open water test; self-propulsion test; RANS; realizable k-ɛ; k-ω SST
• Language: croatian
• URN:NBN: urn:nbn:hr:235:549587
• Study programme: Title: Naval Architecture; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka brodogradnje (magistar/magistra inženjer/inženjerka brodogradnje)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-12-02 18:27:15