To analyze urban thermal environments more rapidly and accurately, a real urban morphology is simulated. Two models are proposed to support Reynolds Averaged Navier Stokes (RANS) simulations including: (1) a Zero-equation (ZEQ) turbulence model for outdoor airflows, and (2) convective heat transfer coefficients (CHTC) on external building surfaces. This study used commercial Computational Fluid Dynamics (CFD) software to implement the newly derived ZEQ turbulence model and CHTC wall boundary conditions. This modified version of CFD software was used to predict the thermal environment of an actual urban area including air temperatures and wind velocities. The simulated air velocities around the buildings are compared with the velocities obtained with the standard k-ε (SKE) turbulence model. The air temperatures around the buildings were compared with measured data in the actual outdoor environment. The comparisons show that this simulation method can rapidly and reliably predict a real outdoor thermal environment in an urban area.
- Heat Transfer Division
A Rapid and Reliable Numerical Method for Predictions of Outdoor Thermal Environment in Actual Urban Areas
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Liu, J, Srebric, J, & Yu, N. "A Rapid and Reliable Numerical Method for Predictions of Outdoor Thermal Environment in Actual Urban Areas." Proceedings of the ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles. Minneapolis, Minnesota, USA. July 14–19, 2013. V003T21A008. ASME. https://doi.org/10.1115/HT2013-17782
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