Simulacija interakcije kapljice i zida proračunskom mehanikom fluida u formulaciji modela slobodne površine i tankog tekućeg sloja

Mačak, Jelena (2018) Simulacija interakcije kapljice i zida proračunskom mehanikom fluida u formulaciji modela slobodne površine i tankog tekućeg sloja. = CFD simulation of wall wetting with the volume of fluid and thin liquid film approach. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Jasak, Hrvoje.

[img]
Preview
Text
Macak_2018_diplomski.pdf - Published Version Jezik dokumenta:Croatian

Download (2MB) | Preview
[img] Text
Mačak_Jelena_autorska_izjava_diplomski_2018.pdf - Published Version
Restricted to Repository staff only Jezik dokumenta:Croatian

Download (501kB)

Abstract (Croatian)

Ovaj rad se bavi numeričkim modeliranjem fenomena kvašenja, odnosno interakcije kapljevine i nepropusne stijenke. Kvašenje je esencijalan dio mnogih industrijskih procesa, a radi svoje poveznice sa stvaranjem leda, relevantno je za zrakoplovstvo. U zrakoplovnoj industriji, numerička simulacija fenomena bi mogla dovesti do značajnih poboljšanja na polju sigurnosti kao i do smanjenja troškova, što je bila motivacija za pisanje ovog rada. Ovaj rad istražuje mogućnosti simulacije kvašenja korištenjem proračunskih metoda računalne dinamike fluida (RDF). U radu su razmatrana dva pristupa: 3-D dvofazni model slobodne površine i 2-D formulacija tankog tekućeg sloja. Obje formulacije su implementirane unutar foam-extend softverskog paketa. Kvašenje je implementirano u 3-D rješavač interFoam i u 2-D rješavač liquidFilmFoam. U interFoam-u, kvašenje je realizirano primjenom rubnog uvjeta, dok je u liquidFilmFoam-u isto ostvareno dodavanjem sile u jednadžbu očuvanja količine gibanja, dovodeći do nove matematičke formulacije modela. Rubni uvjet modela slobodne površine je testiran usporedbom s eksperimentalnim podacima vezanim uz gibanje kapljice niz nagnutu ploču. Model tankog tekućeg sloja je testiran usporedbom s eksperimentalnim i numeričkim podacima o odvajanju struja tankog filma kapljevine. Metode su međusobno uspoređene simulacijom gibanja kapljice pogonjene strujom zraka niz nagnutu ravninu.

Abstract

The focus of this thesis is the numerical modelling of liquid-wall interaction, also referred to as wetting. Wetting is an important part of many industrial applications, and, for aerospace industry, it is relevant as it relates to hazardous ice accretions. Numerical study of the phenomenon could lead to safety improvements and cost reductions, which was the motivation behind the thesis. This thesis examines the feasibility of wall wetting simulations by means of Computational Fluid Dynamics (CFD), using two model formulations: a 3-D two-fluid free surface Volume of Fluid (VoF) flow model and a 2-D thin liquid film model. Both are implemented within the CFD toolbox foam-extend. Implementation of wetting was performed within the VoF interFoam solver and within the thin liquid film liquidFilmFoam solver. In interFoam, wetting is realized using a boundary condition, while in liquidFilmFoam, an additional force term was added into the momentum equation, resulting in a new mathematical formulation. The VoF boundary condition was tested using an experiment related to droplet deposition on an inclined plate. Thin liquid film model was tested using experimental and numerical data related to rivulet flows. Methods were compared using a case of droplet exposed to shear flow on an inclined plate.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: kvašenje; kontaktni kut; model slobodne površine; model tankog tekućeg sloja; RDF; foam-extend
Keywords (Croatian): wetting; contact angle; Volume of Fluid; thin liquid film model; CFD; foam-extend
Subjects: TECHNICAL SCIENCE > Aviation, rocket and space technology
Divisions: 500 Department of Energy, Power Engineering and Environment > 530 Chair of Turbomachinery
Date Deposited: 17 Jul 2018 09:42
Last Modified: 23 Jul 2018 11:00
URI: http://repozitorij.fsb.hr/id/eprint/8677

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

Nema podataka za dohvacanje citata