the construction of underground tunnel plays a more and more important role in the development of big cities. one of the most important problems caused by the construction of the tunnel is that underground excavation will cause large settlement of the ground and buildings. previous studied showed the difference between numerical and experimental results. in this study the case study of niyayesh...

Using CFD, the paper deals with a simulation of all phenomena related to forced-air duct fitted fan, emphasis on unit aerodynamic resistance and untight air ducts. We created 3-dimentional model system including perforations simulating untightens in order make computation network. Boundary conditions were set calculations made ANSYS Fluent 19.1 programme. The computational results assessed usin...

Modern technology has been used to build tunnels in recent years by means of drilling machines (TBM) that were used for civil engineering work in large cities to reduce the harmful effects of spending on the surface of the earth significantly. To build the tunnel, numerical modeling was used on the basis of the finite element method to predict stress behavior during the tunnel construction proc...

Natural ventilation is gaining popularity in response to an increasing demand for a sustainable and healthy built environment, but the design of naturally ventilated building can be challenging due inherent variability operating conditions that determine natural flow. Large-eddy simulations (LES) have significant potential as analysis method flow, since they provide accurate prediction turbulen...

Events that are referred to as geysers have been observed in stormwater or combined sewer systems and are associated with jets of water rising through manholes to a considerable distance above the ground surface. Visual observations suggest that air may be a significant component of the jet. The mechanisms of geyser occurrence have been previously assumed to originate in inertial oscillations t...

Natural ventilation can contribute to a sustainable and healthy built environment, but the flow be highly dependent on configuration outdoor turbulent wind conditions. As result, quantifying natural rates challenging task. Wind tunnel experiments offer one approach for studying ventilation, measurements are often restricted few points or planes in building, data have limitations due intrusive n...

Underground fires are still one of the most significant risks in mines today. In order to manage this risk, it is necessary know potential evolution a fire and effects can have on people other objects. Ventilation plays an essential role development fire; also influences propagation toxic fumes variation temperatures all areas mine. Currently, possible jointly analyze, through numerical modelin...

Urban trees play a crucial role in urban climate many aspects. However, existing research has not adequately explored the impact from time-evolving perspective, that is, tree growth over time. To bridge this gap, study investigates wind tunnel effects of tree-to-canyon foliage cover and relative height (0.32–1.1 times canyon height), mimicking trees, on conditions street canyons during moderate...

In the past, wind towers were applied as the main architectural part of building construction in the desert areas of Iran. These almost high structures were used as cooling load suppliers at residential buildings. In the present study, the effect of symmetric four-sided wind tower in flow induction to the bottom space has been analysed by using a wind tunnel and numerical simulations. In the nu...