Urban Microclimate Modeling of Extreme Weather Events and Their Impacts on Buildings
The combination of climate change, urbanization and limited energy resources have created unprecedented challenges. The conventional approach focusing on a single length or time scale is becoming inadequate to address the challenges spanning from the global environment to the local building scale and from the short-term forecast weather to the long-term future climate. This seminar covers our recent work on multi-scale downscaling simulations from macroclimate, meso-climate and to microclimate and building scales by integrating the Global Environmental Multiscale (GEM) developed by the Environment and Climate Change Canada, our in-house models, City Fast Fluid Dynamics (CityFFD) for urban microclimate and City Building Energy Model (CityBEM) for urban building thermal and energy modeling. CityFFD is a Large Eddy Simulation (LES) model running on graphics processing units (GPU) with high-order semi-Lagrangian interpolation algorithms for both time and space. CityBEM is a physics-based simulation model for urban thermal loads and energy uses. CityFFD exchanges data with CityBEM. We showed our validation studies at different scales for these models and demonstrated the multi-scale downscaling modeling for the study of a historical snowstorm and recent heatwaves. Some on-going work on short-term forecasting simulations and long-term climate impact modeling will also be reported. &a
Professor, Concordia University
Dr. Liangzhu (Leon) Wang is currently an associate professor, the Centre for Zero Energy Building Studies (CZEBS) at Concordia University, Montreal, Canada. He joined Concordia in August 2010. He earned a Ph.D. degree in Mechanical Engineering from Purdue University in 2007 and then worked as a postdoctoral research associate at the Building and Fire Research Laboratory (BFRL) of the National Institute of Standards and Technology (NIST) at Gaithersburg, Maryland, USA. Dr. Wang is a voting member of the TC 4.10 - Indoor Environmental Modeling of ASHRAE, and the editorial member of Energy and Buildings. Dr. Wang received the Best Paper Award from Building and Environment, and the BFRL Distinguished Associate Award of the US NIST. His current research focuses on urban microclimate and building thermal and energy modeling, building scaling and similarity, zero energy building technologies, and building fire safety.