caa a22 4500 445874724 CHVBK 20180317145524.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10652-010-9202-z doi (NATIONALLICENCE)springer-10.1007/s10652-010-9202-z On the heating environment in street canyon [Elektronische Daten] [Rizwan Memon, D. Leung] This study investigates the impact of building aspect ratio (building-height-to-street-canyon-width-ratio), wind speed and surface and air-temperature difference (Δθs−a) on the heating environment within street canyon. The Reynolds-averaged Navier-Stokes (RANS) and energy transport equations were solved with Renormalization group (RNG) theory version of k-$${\varepsilon}$$ turbulence model. The validation process demonstrated that the model could be trusted for simulating air-temperature and velocity trends. The temperature and velocity patterns were discussed in idealized street canyons of different aspect ratios (0.5-2.0) with varying ambient wind speeds (0.5-1.5m/s) and Δθs−a (2-8K). Results show that air-temperatures are directly proportional to bulk Richardson number (R b) for all but ground heating situation. Conversely, air-temperatures increase significantly across the street canyon with a decrease in ambient wind speed; however, the impact of Δθs−a was negligible. Clearly, ambient wind speed decreases significantly as it passes over higher AR street canyons. Notably, air-temperatures were the highest when the windward wall was heated and the least during ground heating. Conversely, air-temperatures were lower along the windward side but higher within the street canyon when the windward wall was heated. The Author(s), 2010 Heating nationallicence Surface-temperature nationallicence CFD nationallicence Turbulence nationallicence Street-canyon nationallicence AR : Aspect ratio nationallicence H : Street canyon height (m) nationallicence W : Street canyon width (m) nationallicence X/W : Spatial co-ordinate in X-direction non-dimensionalised by street canyon width nationallicence $${\overline{{u}}_i }$$ : Mean streamwise (u) and vertical (υ) velocity components (ms−1) nationallicence u a : Horizontal inflow wind speed (ms−1) nationallicence $${\varepsilon}$$ : Dissipation rate of turbulent kinetic energy (m2s−3) nationallicence θ g : Ground level temperature (K) nationallicence μ eff : Effective turbulent viscosity nationallicence G b : Turbulence kinetic energy production due to buoyancy (kgm−1s−3) nationallicence Pr t : Turbulent Prandtl number nationallicence υ : Kinematic viscosity (μ eff/ρ) (m2s−1) nationallicence $${\overline{{u}'_i {u}'_j}}$$ : Reynolds stresses (m2s−2) nationallicence Re y : Wall distance based Reynolds number nationallicence g : Acceleration due to gravity (ms−2) nationallicence p : Pressure (Pascal) nationallicence u i : Velocity components (u,v) in the x and z directions (ms−1) nationallicence Z/H : Spatial coordinate in Z direction non-dimensionalized by street canyon height nationallicence Re H : Reynolds number (based on street canyon height) = uaH/ ν nationallicence R b : $${{\rm Bulk \, Richardson \, number} = \frac{gH(\theta_a -\theta_g )}{\theta_a u_a ^{2}}}$$ nationallicence k : Turbulent kinetic energy (m2s−2) nationallicence θ a : Ambient air-temperature (K) nationallicence μ t : Turbulent viscosity nationallicence G k : Turbulence kinetic energy production due to mean velocity gradient (kgm−1 s −3) nationallicence β : Thermal expansion coefficient (K) nationallicence S ij : Mean rate of strain tensor (1/s) nationallicence $${\alpha_{k}, \alpha_{\varepsilon}}$$ : Inverse Prandtl number for k and $${\varepsilon}$$ nationallicence Δ θ s−a : Difference between the surface and ambient air-temperature (K) nationallicence Memon Rizwan Department of Mechanical Engineering, Mehran University of Engineering & Technology, Jamshoro, Sindh, Pakistan aut Leung D. Department of Mechanical Engineering, University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong aut Environmental Fluid Mechanics Springer Netherlands 11/5(2011-10-01), 465-480 1567-7419 11:5<465 2011 11 10652 https://doi.org/10.1007/s10652-010-9202-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-010-9202-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Memon Rizwan Department of Mechanical Engineering, Mehran University of Engineering & Technology, Jamshoro, Sindh, Pakistan aut NATIONALLICENCE 700 1- Leung D. Department of Mechanical Engineering, University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/5(2011-10-01), 465-480 1567-7419 11:5<465 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer