Računalno modeliranje aerodinamičkog opterećenja zgrade uz primjenu modela turbulencije Reynoldsovog tenzora naprezanja

undergraduate thesis

• Title (english): Computational modelling of aerodynamic loads on a building using the Reynolds stress turbulence model
• Author: Loren Frančin
• Mentor: Hrvoje Kozmar (mentor)
• Committee member: Dražen Lončar (predsjednik povjerenstva)
• Committee member: Goran Krajačić (član povjerenstva)
• Committee member: Danijel Šestan (član povjerenstva)
• Committee member: Ante Marušić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Cilj rada je primjena modela turbulencije Reynoldsovog tenzora naprezanja kod računalnog mo- deliranja opstrujavanja zgrade oblika kocke smještene u homogenom atmosferskom graničnom sloju, kako bi se utvrdilo je li spomenutim modelom moguće bolje računalno modelirati opterećenje zgrada u usporedbi s Menterovim k−ω SST modelom. U radu je za razvoj mreže konačnih volumena i računalnu simulaciju korišten programski alat OpenFOAM® , tj. foam-extend-3.2.
U radu su iz jednadžbi modela turbulencije Reynoldsovog tenzora naprezanja izvedeni rubni uvjeti koje je potrebno koristiti kako bi se pravilno računalno modeliralo strujanje homogenog atmosferskog graničnog sloja korištenjem tehnike domene preteče u praznoj dvodimenzijskoj računalnoj domeni. Pritom je strujanje u blizini nepropusne hrapave stijenke modelirano zidnom funkcijom temeljenom na aerodinamičkoj duljini hrapavosti površine. Profili fizikalnih veličina dobiveni računalnom analizom strujanja u dvodimenzijskoj domeni su potom korišteni kao rubni uvjeti na ulaznoj granici trodimenzijske računalne domene u kojoj je smješten model zgrade oblika kocke.
Računalnom analizom strujanja atmosferskog graničnog sloja oko modela zgrade je pokazano da se korištenjem modela turbulencije Reynoldsovog tenzora naprezanja ne postižu bolji rezultati računalno generirane raspodjele koeficijenta tlaka po stranicama zgrade u odnosu na dostupne eksperimentalne rezultate i računalne rezultate dobivene korištenjem ostalih RANS modela turbulencije.

Abstract (english)

The goal in this thesis is the application of the Reynolds stress tensor turbulence model for modelling the flow over a model of a cubic-shaped building in the atmospheric boundary layer to determine whether it yields better results than when using Menter’s k − ω SST turbulence model. The CFD software used to generate the finite volume mesh and computationally model the given problem is a fork of OpenFOAM® called foam-extend-3.2. Proper boundary conditions for a successful modelling of the homogeneous atmospheric boundary layer using the precursor domain technique in an empty two-dimensional computational domain were derived from the Reynolds stress transport equations. A wall function based on the aerodynamic surface roughness length was used to model the flow near the impermeable rough surface. The resulting profiles were subsequently applied onto the inlet boundary of the three-dimensional computational domain which includes the cubic-shaped building model. It was determined that the flow over a cubic-shaped building in the atmospheric boundary layer created using the Reynolds stress transport turbulence model does not provide a better reproduction on the experimental data of the distribution of the pressure coefficient along various lines on the cubic-shaped building model compared to other RANS turbulence models.

• Keywords: Računalna dinamika fluida; Aerodinamika okoliša; Računalna aerodinamika okoliša; Stacionarni homogeni atmosferski granični sloj; Opterećenje zgrade; RANS modeli turbulencije; Model turbulencije Reynoldsovog tenzora naprezanja
• Keywords (english): Computational fluid dynamics; Environmental aerodynamics; Computational environmental aerodynamics; Steady-state homogeneous atmospheric boundary layer; Wind loads on structures; RANS turbulence models; Reynolds stress turbulence model
• Language: croatian
• URN:NBN: urn:nbn:hr:235:529000
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Engineering Modelling and Computer Simulation; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-28 10:21:49