Aerodynamic Effect of Trees on Traffic Pollutant  In an Ideal Street Canyon

2021 ◽  
Author(s):  
Smaeyl Hassanzadeh ◽  
Seyed Hossein Moayedi
Keyword(s):  
Street Canyon ◽  
Aerodynamic Effect

Experimental Investigation of a Two-Phase (Air-Water) Flow in a Pipe with Street Canyon Cavities

2014 ◽  
Vol 8 (6) ◽  
pp. 1149
Author(s):  
Dimitra A. Zoga ◽  
Dimitrios S. Georgakis-Gavrilis ◽  
Dionissios P. Margaris
Keyword(s):  
Experimental Investigation ◽  
Water Flow ◽  
Street Canyon ◽  
Two Phase

Evaluation of the influence of wind speed and angle of attack on the aerodynamic effect of wind turbine blades

2017 ◽  
Author(s):  
Salete Alves ◽  
Luiz Guilherme Vieira Meira de Souza ◽  
Edália Azevedo de Faria ◽  
Maria Thereza dos Santos Silva ◽  
Ranaildo Silva
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Angle Of Attack ◽  
Wind Turbine Blades ◽  
Aerodynamic Effect

scholarly journals The impact of measures to reduce ambient air PM<sub>10</sub> concentrations originating from road dust, evaluated for a street canyon in Helsinki

2019 ◽  
Vol 19 (17) ◽  
pp. 11199-11212 ◽  
Author(s):  
Ana Stojiljkovic ◽  
Mari Kauhaniemi ◽  
Jaakko Kukkonen ◽  
Kaarle Kupiainen ◽  
Ari Karppinen ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Street Canyon ◽  
Dust Emission ◽  
Road Dust ◽  
Ambient Air ◽  
Air Quality Measurements ◽  
Emission Models ◽  
The Impact ◽  
Quality Measurements

Abstract. We have numerically evaluated how effective selected potential measures would be for reducing the impact of road dust on ambient air particulate matter (PM10). The selected measures included a reduction of the use of studded tyres on light-duty vehicles and a reduction of the use of salt or sand for traction control. We have evaluated these measures for a street canyon located in central Helsinki for four years (2007–2009 and 2014). Air quality measurements were conducted in the street canyon for two years, 2009 and 2014. Two road dust emission models, NORTRIP (NOn-exhaust Road TRaffic Induced Particle emissions) and FORE (Forecasting Of Road dust Emissions), were applied in combination with the Operational Street Pollution Model (OSPM), a street canyon dispersion model, to compute the street increments of PM10 (i.e. the fraction of PM10 concentration originating from traffic emissions at the street level) within the street canyon. The predicted concentrations were compared with the air quality measurements. Both road dust emission models reproduced the seasonal variability of the PM10 concentrations fairly well but under-predicted the annual mean values. It was found that the largest reductions of concentrations could potentially be achieved by reducing the fraction of vehicles that use studded tyres. For instance, a 30 % decrease in the number of vehicles using studded tyres would result in an average decrease in the non-exhaust street increment of PM10 from 10 % to 22 %, depending on the model used and the year considered. Modelled contributions of traction sand and salt to the annual mean non-exhaust street increment of PM10 ranged from 4 % to 20 % for the traction sand and from 0.1 % to 4 % for the traction salt. The results presented here can be used to support the development of optimal strategies for reducing high springtime particulate matter concentrations originating from road dust.

Experimental and simulation research on the aerodynamic effect on a train with a wind barrier in different lengths

2021 ◽  
Vol 214 ◽  
pp. 104644
Author(s):  
Houyu Gu ◽  
Tanghong Liu ◽  
Zhiwei Jiang ◽  
Zijian Guo
Keyword(s):  
Simulation Research ◽  
Aerodynamic Effect ◽  
Wind Barrier

Effect of mutual radiative exchange between the surfaces of a street canyon on the building thermal energy demand

Energy ◽  
2021 ◽  
pp. 120346
Author(s):  
Gabriele Battista ◽  
Emanuele de Lieto Vollaro ◽  
Paweł Ocłoń ◽  
Andrea Vallati
Keyword(s):  
Thermal Energy ◽  
Street Canyon ◽  
Energy Demand ◽  
Radiative Exchange

scholarly journals Aerodynamic analysis of uphill drafting in cycling

2021 ◽  
Vol 24 (1) ◽  
Author(s):  
T. van Druenen ◽  
B. Blocken
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
High Speed ◽  
Scientific Literature ◽  
Sensitivity Analyses ◽  
Air Resistance ◽  
Wind Tunnel Measurements ◽  
Aerodynamic Effect ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations

AbstractSome teams aiming for victory in a mountain stage in cycling take control in the uphill sections of the stage. While drafting, the team imposes a high speed at the front of the peloton defending their team leader from opponent’s attacks. Drafting is a well-known strategy on flat or descending sections and has been studied before in this context. However, there are no systematic and extensive studies in the scientific literature on the aerodynamic effect of uphill drafting. Some studies even suggested that for gradients above 7.2% the speeds drop to 17 km/h and the air resistance can be neglected. In this paper, uphill drafting is analyzed and quantified by means of drag reductions and power reductions obtained by computational fluid dynamics simulations validated with wind tunnel measurements. It is shown that even for gradients above 7.2%, drafting can yield substantial benefits. Drafting allows cyclists to save over 7% of power on a slope of 7.5% at a speed of 6 m/s. At a speed of 8 m/s, this reduction can exceed 16%. Sensitivity analyses indicate that significant power savings can be achieved, also with varying bicycle, cyclist, road and environmental characteristics.

scholarly journals Aerodynamic effect of icing/rain impacts on super-hydrophobic surfaces

2018 ◽  
Author(s):  
N. Okulova ◽  
R. Taboryski ◽  
J. N. Sørensen ◽  
S. I. Shtork ◽  
V. L. Okulov
Keyword(s):  
Hydrophobic Surfaces ◽  
Aerodynamic Effect

Rotating Fiber Jets during Forcespinning with Aerodynamic Effect

2018 ◽  
Vol 144 (8) ◽  
pp. 04018069 ◽  
Author(s):  
D. N. Riahi
Keyword(s):  
Aerodynamic Effect
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