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master's thesis
Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2020. urn:nbn:hr:235:676819
Kovačić, Luka
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

Kovačić, L. (2020). Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:676819

Kovačić, Luka. "Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2020. https://urn.nsk.hr/urn:nbn:hr:235:676819

Kovačić, Luka. "Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2020. https://urn.nsk.hr/urn:nbn:hr:235:676819

Kovačić, L. (2020). 'Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 26 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:676819

Kovačić L. Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2020 [cited 2024 December 26] Available at: https://urn.nsk.hr/urn:nbn:hr:235:676819

L. Kovačić, "Validacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:235:676819

Metadata
TitleValidacija modela turbulencije pri tranziciji iz laminarnog u turbulentno strujanje
Title (english)Validation of laminar-to-turbulent transitional flow turbulence models
AuthorLuka Kovačić
MentorHrvoje Jasak (mentor)
Committee memberHrvoje Jasak (predsjednik povjerenstva)
Committee memberMarino Grozdek (član povjerenstva)
Committee memberTea Žakula (član povjerenstva)
Committee memberDamir Dović (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2020-04-10, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Process Energy Engineering
Abstract
Računalna dinamika fluida (RDF) grana je dinamike fluide vezana uz analizu sustava koji uključuju strujanje fluida, prijenos topline i ostale srodne fenomene, putem računalnih simulacija. RDF se temelji na numeričkom rješavanju Navier-Stokes jednadžbi koje opisuju strujanje fluida. Modeliranje turbulencije smatra se jednim od ključnih aspekata RDF-a te se kao takav desetljećima usavršava. Iako je danas moguće precizno simulirati široki niz potpuno turbulentnih industrijskih strujanja, prihvaćeni modeli turbulencije još uvijek ne omogućavaju pouzdano simuliranje tranzicijskog strujanja u industrijskoj primjeni. Postojeći tranzicijski modeli turbulencije ograničeni su na teorijsku primjenu budući da se još uvijek nalaze u fazi validacije ili razvoja. Cilj ovog rada je, 2D simuliranjem strujanja fluida oko ravne ploče te aeroprofila Eppler 387, validirati tranzicijski model trubulencije gamma-Re_theta usporedbom rezultata simulacija s onima dobro poznatog potpuno turbulentog k-Omega SST modela turbulencije te s eksperimentalnim podacima. Također je procijenjena i numerička nesigurnost rezultata, u ovisnosti o gustoći mreža, u skladu s Eca i Hoekstra. Rezultati simulacija su u većini slučajeva pokazali dobro oponašanje tranzicijskih procesa te dobro slaganje s eksperimentalnim rezultatima.
Abstract (english)
Urgent generation of turbulence models for Computational Fluid Dynamics (CFD) enabled accurate simulation of fully turbulent flows in industry for decades, however, prediction accuracy for laminar-to-turbulent transitional flow lags significantly. Transitional turbulence models are still either in development or validation phase and not sufficiently mature for regular use in industrial computational fluid dynamics (CFD). In this Thesis validation of the Langtry-Menter k-Omega SST, a transitional 4 equation turbulence model is presented. The Langtry-Menter k-Omega SST, also known as the gamma-Re_theta model, is a 4 equation correlation-based transition model built strictly on local variables. Transitional turbulence model gamma-Re_theta is compared with the well known k-Omega SST model by Menter. The k-Omega SST is a 2 equation eddy-viscosity model. 2D validation is carried out for a Flat Plate geometry and the Eppler 387 airfoil geometry. Systematic mesh refinement study is performed for every geometry, with 9 meshes of different resolution. Flow quantities selected for comparison with experimental data include mean horizontal velocity profile, at three locations and skin friction coefficient for the Flat Plate geometry and pressure coefficient for Eppler 387 airfoil geometry. Furthermore, numerical uncertainty of the results, with regard to mesh density, is evaluated in accordance with Eca and Hoekstra. Simulation results for most of the 2D test cases show accurate transition behaviour and high correspondence with the experimental data.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:235:676819
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 on2020-04-03 17:54:24