Abstract. In this paper, on the background of a short overview of the recent advances in the field of Environmental Wind Engineering (EWE), a comparison of wind tunnel experiment and numerical simulation for some cases of airflow around an urban layout have been reported. The purpose of the study is quantitative and qualitative comparison of measurements in the wind tunnel as well as numerical simulation using Ansys Fluent software. The study is concerned mostly with the analysis of parameters which are essential in the building industry, such as pressure and velocity fields. In the numerical analysis the k-ε realizable model of turbulence with the basic model of boundary layer -Standard Wall Treatment, were used. Particular attention has been paid to accurate depiction of the conditions on the inlet and the selection of suitable computing.
In the paper, the authors discuss the construction of a model of an exemplary urban layout. Numerical simulation has been performed by means of a commercial software Fluent using two different turbulence models: the popular k-ε realizable one, and the Reynolds Stress Model (RSM), which is still being developed. The former is a 2-equations model, while the latter -is a RSM model -that consists of 7 equations. The studies have shown that, in this specific case, a more complex model of turbulence is not necessary. The results obtained with this model are not more accurate than the ones obtained using the RKE model. The model, scale 1:400, was tested in a wind tunnel. The pressure measurement near buildings, oil visualization and scour technique were undertaken and described accordingly. Measurements gave the quantitative and qualitative information describing the nature of the flow. Finally, the data were compared with the results of the experiments performed. The pressure coefficients resulting from the experiment were compared with the coefficients obtained from the numerical simulation. At the same time velocity maps and streamlines obtained from the calculations were combined with the results of the oil visualisation and scour technique.
Idea prosumpcji polega na włączaniu przyszłego użytkownika w proces powstawania dobra, z którego będzie w przyszłości korzystał. Zjawisko to pojawia się w architekturze i budownictwie w niewielkim zakresie, jednak dynamiczny rozwój technologii w coraz większym stopniu tworzy możliwości dla takiego podejścia. W artykule poruszono ideę prosumpcji w odniesieniu do procesu wznoszenia budynku. Przedstawiono kierunki, które można wyodrębnić na podstawie analizy podejmowanych współcześnie prób samodzielnego budowania. Na ich tle zaprezentowano autorską koncepcję systemu pozwalającego wznosić obiekty o niewielkiej skali samodzielnie przez osoby nieposiadające wiedzy w zakresie budownictwa. Koncepcja powstała w ramach poszukiwań badawczych typu research by design. Studium obejmuje ogólną koncepcję systemu oraz projekt jego wykorzystania przy wzniesieniu domu mieszkalnego rekreacyjnego o powierzchni 35 m2. Projekt pozwolił autorom na wstępną ocenę jego możliwości i ograniczeń oraz przewidywania, w jaki sposób można je rozwijać.
The need to ensure healthy and comfortable environmental conditions for city residents is one of the assumptions that define the concept of sustainable urban development. Factors, such as feeling the temperature, air movement, air smell or humidity, contribute to the quality in use of urban space and, indirectly, also the buildings themselves. Modern cities, especially the largest cities, face problems of air pollution, insufficient air exchange rate and overheating, all of which appear in built-up areas. Among the factors causing such a situation, a high concentration of buildings and hardened surfaces in cities may be mentioned. Solar energy is accumulated through building walls and surfaces, whereas the release of solar energy is impeded by the wind velocity slowdown, a characteristic phenomenon in case of cities, which is estimated at 20-30% in relation to air movement in city outskirt areas [1]. In spite of the slowdown mentioned, varied wind phenomena in a relatively small area, such as turbulence and rapid airflow acceleration and air stagnation may occur around buildings simultaneously. The dependence of these phenomena on the shape of buildings and the distance between them is clearly visible and proven [2,3,4]. Within the scope of environmental wind engineering, knowledge is developed which deals with the issues of wind comfort for pedestrians and of the possibilities for ventilating urban spaces.
Abstract. This paper presents research which compares the numerical and the experimental results for different cases of airflow around a few urban layouts. The study is concerned mostly with the analysis of parameters, such as pressure and velocity fields, which are essential in the building industry. Numerical simulations have been performed by the commercial software Fluent, with the use of a few different turbulence models, including popular k-ε, k-ε realizable or k-ω. A particular attention has been paid to accurate description of the conditions on the inlet and the selection of suitable computing grid. The pressure measurement near buildings and oil visualization were undertaken and described accordingly.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.