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master's thesis
Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. urn:nbn:hr:235:754167
Šutalo, Filip
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

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

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Šutalo, F. (2017). Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:754167

Šutalo, Filip. "Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:754167

Šutalo, Filip. "Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:754167

Šutalo, F. (2017). 'Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 26 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:754167

Šutalo F. Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2017 [cited 2024 December 26] Available at: https://urn.nsk.hr/urn:nbn:hr:235:754167

F. Šutalo, "Ispitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:235:754167

Metadata
TitleIspitivanje inačica poboljšanih funkcija zida u simulaciji turbulentnog strujanja
Title (english)Evaluation of variants of enhanced wall treatment wall function in turbulent flow simulations
AuthorFilip Šutalo
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
Process Energy Engineering
Abstract
Ovaj rad prikazuje implementaciju i rezultate simulacija za zidne funkcije za modele turbulencije s dvije transportne jednadžbe. Fokus je na ispitivanju zidnih funkcija primjerenih u uvjetima neravnotežnog turbulentnog graničnog sloja za koje standardne zidne funkcije izvedene iz zakona zida nisu prikladne. Iako se rad primarno fokusira na zidne funkcije, za dublje razumijevanje problema nužno je poznavati principe o modeliranju turbulencije. Iz tog razloga, istaknuti su osnovni koncepti pri izvodenju zakona zida. Izrazito važno svojstvo, koje definira postupanje s rubnim uvjetima na zidu, je asimptotska konzistentnost modela turbulencije, koja je ukratko pojašnjena. Generalna metodologija specificiranja rubnih uvjeta na zidu je objašnjena, te su dani izvodi matematičkih izraza za svaku metodu. Tretman rubnih uvjeta na zidu za k − ω SST model temeljen na izrazu za neravnotežni turbulentni granični sloj [1] izveden je detaljno i vodi k zaključku da uključivanjem konvektivnih članova u izraze može dovesti do poboljšanja u točnosti. Prikazane zidne funkcije, ugradene su u foam-extend i usporedeni sa standardnim zidnim funkcijama za dva slučaja: opstrujavanje NACA4412 aeroprofila i opstrujavanje rotacijskog elipsoida. Zaključeno je da odredeni tretmani rubnih uvjeta na zidu nude prednost nad trenutačno korištenima u foam-extendu, no i da je potrebna daljnja analiza utjecaja gradijenta tlaka i konvektivnih članova.
Abstract (english)
This work presents several treatments of the wall boundary conditions for RANS turbulence models. The focus is the investigation of wall functions suitable for non-equilibrium conditions where the standard wall functions derived from the law-of-the-wall are known to fail. Although the thesis focuses on wall treatments, for deeper understanding of the problem, knowledge of turbulence modelling is essential. Therefore some key concepts are outlined through a derivation of the law-of-the-wall. Also, analytical solutions for the k − ε and k − ω SST model for near-wall regions are given. A property, which defines the treatment of the wall boundary condition, is the asymptotic consistency of turbulence model which is briefly discussed. A general methodology for specifying the wall boundary condition is explained and expressions for each method are presented in detail. Wall treatment for the k − ω SST model based on pressure sensitised law-of-the-wall [1] is derived in detail and leads to a conclusion that including the convective terms in expressions could improve accuracy. The wall treatments are implemented in foam-extend and compared with standard wall functions on two test cases: flow past the NACA4412 aerofoil and the 6:1 prolate spheroid. A conclusion is reached that certain wall treatments offer an advantage over standard ones implemented in foam-extend, although it is emphasised that further investigation on the effects of pressure gradient and convective terms should be conducted.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:754167
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 19:26:55