Računalni aerodinamički model zgrade s dvostrukim poroznim pročeljem

master's thesis

• Title (english): Computational aerodynamic model of buildings with porous double-skin façades
• Author: Mislav Babić
• Mentor: Hrvoje Kozmar (mentor)
• Mentor: Franjo Juretić (komentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-01-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Sustav dvostrukog pročelja se koristi s ciljem poboljšanja energetske učinkovitosti zgrade. Sustav se sastoji od unutarnjeg pročelja na koje je smješteno vanjsko pročelje, pri čemu razmak između dvaju pročelja može iznositi od nekoliko centimetara do dva metra. Posebnu vrstu sustava dvostrukog pročelja predstavlja sustav dvostrukog poroznog pročelja kod kojeg se poroznost postiže otvorima na vanjskom pročelju. Pri strujanju vjetra oko zgrade s dvostrukim poroznim pročeljem dolazi do strujanja zraka kroz otvore na vanjskom pročelju i između dvaju pročelja. Takvo strujanje uzrokuje raspodjelu tlaka na zgradi koja nije karakteristična za zgrade s jednostrukim pročeljem.
U ovom radu je provedena računalna analiza atmosferskog strujanja zraka oko modela zgrade s dvostrukim poroznim pročeljem za slučaj visoke poroznosti vanjskog pročelja. Modeli zgrade i poroznog pročelja, te značajke modela atmosferskog graničnog sloja, su preuzeti iz laboratorijskih mjerenja u zračnom tunelu. Ispitana su dva pristupa računalnom modeliranju strujanja vjetra. Prvi pristup je utemeljen na zadavanju volumenskog protoka fluida na ulazu u računalnu domenu, dok se drugi pristup temeljio na izravnom modeliranju strujanja homogenog atmosferskog graničnog sloja. Računalni model je razvijen u programskom paketu OpenFOAM, a prostorna diskretizacija računalne domene je izrađena pomoću programskog paketa CF-MESH+. Postignuti rezultati su uspoređeni s rezultatima laboratorijskih mjerenja.

Abstract (english)

Double-skin façade systems have been commonly used to improve the energy efficiency of buildings. This type of façade systems consists of an internal façade onto which an external façade is placed, with the gap between the two façades ranging from a few centimeters to two meters. A special type of a double-skin façade system is the porous double-skin façade, where porosity is achieved using openings on the external façade. When the wind flows around buildings with this type of façade, air flow occurs through the openings on the external façade and between the two façades. This type of flow yields pressure distribution on the building that is not characteristic of buildings with a single façade.
In this study, the computational analysis of atmospheric air flows around the building model equipped with a porous double-skin façade was conducted for the case of high porosity of the external façade. The appearance of the building model and the porous façade, as well as the characteristics of the atmospheric boundary layer model, were adopted from the wind-tunnel experiments. Two approaches to computational modeling of the wind flow were addressed. The first approach involved specifying the volumetric flow of the fluid at the inlet to the computational domain, while the second approach was based on the direct modeling of the homogeneous atmospheric boundary layer. The computational model was developed using the OpenFOAM software package, while the spatial discretization of the computational domain was performed using the CF-MESH+ software package. The obtained results were compared with the results of laboratory experiments.

• Keywords: dvostruko porozno pročelje; atmosferski granični sloj; računalna dinamika fluida; CF-MESH+
• Keywords (english): porous double-skin façade; atmospheric boundary layer; computational fluid dynamics; CF-MESH+
• Language: croatian
• URN:NBN: urn:nbn:hr:235:466961
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-01-23
• Created on: 2024-01-23 12:52:31