prikaz prve stranice dokumenta Numerical modelling of coupled potential and viscous flow for marine applications
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doctoral thesis
Numerical modelling of coupled potential and viscous flow for marine applications
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2016. urn:nbn:hr:235:656625
Vukčević, Vuko
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

Vukčević, V. (2016). Numerical modelling of coupled potential and viscous flow for marine applications (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:656625

Vukčević, Vuko. "Numerical modelling of coupled potential and viscous flow for marine applications." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2016. https://urn.nsk.hr/urn:nbn:hr:235:656625

Vukčević, Vuko. "Numerical modelling of coupled potential and viscous flow for marine applications." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2016. https://urn.nsk.hr/urn:nbn:hr:235:656625

Vukčević, V. (2016). 'Numerical modelling of coupled potential and viscous flow for marine applications', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 30 August 2024, https://urn.nsk.hr/urn:nbn:hr:235:656625

Vukčević V. Numerical modelling of coupled potential and viscous flow for marine applications [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2016 [cited 2024 August 30] Available at: https://urn.nsk.hr/urn:nbn:hr:235:656625

V. Vukčević, "Numerical modelling of coupled potential and viscous flow for marine applications", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2016. Available at: https://urn.nsk.hr/urn:nbn:hr:235:656625

Metadata
TitleNumerical modelling of coupled potential and viscous flow for marine applications
Title (croatian)Numeričko modeliranje spregnutog potencijalnog i viskoznog strujanja za primjenu u pučinskoj i brodskoj hidrodinamici
AuthorVuko Vukčević
MentorHrvoje Jasak (mentor)
Committee memberNastia Degiuli (predsjednik povjerenstva)
Committee memberHrvoje Jasak (član povjerenstva)
Committee memberMilovan Perić (član povjerenstva)
strani drzavljanin: Nije dostupno
Committee memberMichel Vissoneau (član povjerenstva)
strani drzavljanin: Nije dostupno
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2016-11-08, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Shipbuilding
Hydromechanics of Floating and Maritime Structures
Universal decimal classification
(UDC)		51 - Mathematics
53 - Physics
Abstract
A numerical framework for coupling arbitrary potential flow with fully nonlinear, two-phase and turbulent Computational Fluid Dynamics model is presented in this work. The model is implemented in arbitrary polyhedral Finite Volume method in OpenFOAM software. The present model relies on the Ghost Fluid Method for discretisation of jump conditions, yielding infinitesimally sharp density and pressure jumps across the free surface. Interface capturing is achieved with implicitly redistanced Level Set method, rendering additional redistancing steps unnecessary. The potential and viscous flow coupling is achieved via Spectral Wave Explicit Navier-Stoked Equations approach, where the solution is decomposed into incident potential flow solution and perturbation components. Wave reflection is prevented by using relaxation zones with implicit treatment. All methodologies are mathematically and reformulated to adhere to strongly conservative, polyhedral Finite Volume method. The numerical model is validated and verified on four sets of test cases: free surface flow over a ramp, wave propagation, assessment of higher order forces on a vertical cylinder and seakeeping of a ship. The computational results compare well with analytical, other numerical and experimental results. A strong emphasis is given to numerous sensitivity studies addressing numerical uncertainties.Scientific contributions of this work is the reformulation of the above mention mehods for Finite Volume discretisation and their implementation in the same numerical framework.
Abstract (croatian)
U doktorskom je radu prikazano numeričko okruženje za spregu proizvoljnoga potencijalnoga strujanja s potpuno nelinearnim, dvofaznim i turbulentnim modelom računalne dinamike fluida. Model je implementiran u metodi kontrolnih volumena proizvoljnoga oblika u OpenFOAM programskom paketu. Model se zasniva na Ghost Fluid metodi za diskretizaciju skokovitih rubnih uvjeta, dajući inifinitezimalno skokovitu raspodjelu slobodne površine i tlaka na slobodnoj površini. Slobodna površina prati se implicitno reinicijaliziranom Level Set metodom, gdje nije potrebno provoditi dodatnu reinicijalizaciju. Sprega potencijalnoga i viskoznoga strujanja provedena je Spectral Wave Explicit Navier-Stoked Equations metodom, gdje se rješenje razlaže na potencijalno strujanje koje modelira nailazne valove i perturbacijsku komponentu. Refleksija valova spriječena je uporabom relaksacijskih zona s implicitnim tretmanom. Sve su metode matematički reformulirane zbog diskretizacije metodom kontrolnih volumena, koja je strogo konzervativna. Numerički je model validiran i verificiran pomoću četiriju skupova primjera: strujanje sa slobodnom površinom uz kosu stepenicu, propagacija vala, proračun sila višega reda na vertikalni cilindar te pomorstvenost broda. Rezultati simulacija dobro se slažu s analitičkim, numeričkim i eksperimentalnim rezultatima. Velika je važnost pridodana brojnim analizama osjetljivosti simulacija, što je omogućilo kvantifikaciju numeričkih neizvjesnosti. Znanstveni je doprinos doktorskoga rada u reformulaciji gore navedenih metoda u metodi kontrolnih volumena te njihova implementacija u isto numeričko okruženje.
Keywords
Keywords (croatian)
Languageenglish
URN:NBNurn:nbn:hr:235:656625
Study programmeTitle: Mechanical Engineering and Naval Architecture
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-04-15 17:43:05