Nova metoda za računalno modeliranje atmosferskog graničnog sloja

Cindori, Mihael (2016) Nova metoda za računalno modeliranje atmosferskog graničnog sloja. = A novel method for computational modelling of the atmospheric boundary layer. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Juretić, Franjo.

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Abstract (Croatian)

U ovom radu predložena je nova metoda za računalno modeliranje stacionarnog homogenog atmosferskog graničnog sloja koristeći računalnu dinamiku fluida. Metoda se temelji na uvođenju novog izvorskog člana u jednadžbu količine gibanja čija je glavna svrha postizanje homogenog strujanja u graničnom sloju. Početna vrijednost izvorskog člana se računa korištenjem eksperimentalnih vrijednosti naprezanja dobivenih simulacijom atmosferskog graničnog sloja u zračnom tunelu. S ciljem postizanja strujanja što sličnijeg eksperimentu, tijekom proračuna je vršena korekcija vrijednosti izvorskog člana. U radu je modeliran atmosferski granični sloj mjeren u zračnom tunelu. Za modeliranje turbulencije je korišten standardni k − ε model turbulencije uz izmjenjene vrijednosti koeficijenata modela. Točnost računalnog modela je provjerena na ruralnom, suburbanom i urbanom tipu terena, te su u radu dani rezultati za brzinu, naprezanje i turbulentnu kinetičku energiju dobiveni na tri različita mjesta u računalnoj domeni (na ulazu i izlazu, te u sredini domene). Na taj način je pokazano da novi model omogućuje modeliranje homogenog atmosferskog graničnog sloja, te su greške simulacije u većini domene manje od ±10%.

Abstract

A novel approach for computational modelling of the steady-state neutrally-stratified atmospheric boundary layer was introduced in this work. The approach is based on the introducing of a new source term in the momentum equation, implemented to establish the homogeneous characteristics of the flow. The initial value of the term is calculated from experimental stress values and the corrections were applied during the calculation in order to obtain exact results. The atmospheric boundary layer, modelled in this work, was previously established and measured in a wind tunnel. Turbulence is modelled by using the standard k − ε turbulence model with modified coefficients. A new model was validated on the rural, suburban and urban terrain and computational results for velocity, stress and turbulent kinetic energy were sampled at inlet, outlet and middle part of the computational domain. Thus, it is shown that new approach can be used for simulations of the steady-state neutrally-stratified atmospheric boundary layer with errors not larger than ±10% in most parts of the computational domain.

Item Type:	Thesis (Master's thesis (Bologna))
Uncontrolled Keywords:	Stacionarni homogeni atmosferski granični sloj; računalna dinamika fluida; stacionarni k − ε model turbulencije
Keywords (Croatian):	Steady-state neutrally-stratified atmospheric boundary layer; computational modelling; steady RANS; k − ε turbulence model
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	300 Department of Thermodynamics, Thermal and Process Engineering > 310 Chair of Technical Thermodynamics
Date Deposited:	14 Jan 2016 09:40
Last Modified:	02 Apr 2020 15:05
URI:	http://repozitorij.fsb.hr/id/eprint/4959

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