1,721,030 research outputs found
CFD analysis of natural ventilation in a generic environment:impact of street width on indoor airflow pattern and airflow rate
No full textNumerical study of the urban heat island effect:evaluation of impacts and adaptation measures
No full textDynamics of plane impinging jets at moderate Reynolds numbers:with applications to air curtains
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Large Eddy simulations applied to wind loading and pollutant dispersion
Full text linkThe application of Computational Fluid Dynamics based on the Reynolds-Averaged Navier-Stokes equations to the simulation of bluff body aerodynamics has been thoroughly investigated in the past. Although a satisfactory accuracy can be obtained for some urban physics problems their predictive capability is limited to the mean flow properties, while the ability to accurately predict turbulent fluctuations is recognized to be of fundamental importance when dealing with wind loading and pollution dispersion problems. The need to correctly take into account the flow dynamics when such problems are faced has led researchers to move towards scale-resolving turbulence models such as Large Eddy Simulations (LES). The development and assessment of LES as a tool for the analysis of these problems is nowadays an active research field and represents a demanding engineering challenge.
This research work has two objectives. The first one is focused on wind loads assessment and aims to study the capabilities of LES in reproducing wind load effects in terms of internal forces on structural members. This differs from the majority of the existing research, where performance of LES is evaluated only in terms of surface pressures, and is done with a view of adopting LES as a complementary design tools alongside wind tunnel tests. The second objective is the study of LES capabilities in calculating pollutant dispersion in the built environment. The validation of LES in this field is considered to be of the utmost importance in order to conceive healthier and more sustainable cities.
In order to validate the numerical setup adopted, a systematic comparison between numerical and experimental data is performed. The obtained results are intended to be used in the drafting of best practice guidelines for the application of LES in the urban physics field with a particular attention to wind load assessment and pollution dispersion problems
The Amsterdam ArenA: A study into the indoor climate and optimalization by means of a variation analysis with CFD
No full textThe Amsterdam ArenA is a multifunctional stadium that is used for sports games, concerts and other events. The ArenA was the first stadium in Europe to be equipped with a retractable roof. The retractable roof enforces the stadium’s multifunctional character. No HVAC systems are present in the ArenA so the air exchange rate is governed by natural ventilation through opeflings in the façade of the stadium
Air curtain optimization
No full text\u3cp\u3eThe term “impinging jet” refers to a high-velocity fluid stream that is ejected from a nozzle, a narrow opening or an orifice, and which impinges on a surface. As applied to the built environment, impinging jets are used in air curtains to separate two environments subjected to different environmental conditions with the purpose of improving thermal comfort, air quality, energy efficiency and fire protection in buildings. The design and application of state-of-the-art air curtains requires detailed knowledge of the relationship between the separation efficiency of air curtains—their main performance criterion—and a wide range of jet and environmental parameters involving air curtain design. In order to address the current knowledge gaps in the field, this project encompasses an investigation into the impact of different jet and environmental parameters on the performance of air curtains while giving special attention to the study of innovative jet excitation techniques by means of optimizing the separation efficiency of air curtains.\u3c/p\u3
Geometry and ventilation : evaluation of the leeward sawtooth roof potential in the natural ventilation of buildings
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