An introduction to the Atmospheric Boundary Layer (ABL), including measurements and simulations of ABL flows. Wind and flow, turbulent transport, buoyancy and virtual potential temperature, the diurnal cycle. Derivation of the governing equations, simplifications and assumptions. Turbulence kinetic energy and its budget, ABL stability, the Richardson number and teh Obukhov length. Analysis of boundary layer turbulence. Overview of field and wind tunnel measurement techniques, and of computational models from meso- to micro-scale. a Discussion of micro-scale applications, including pedestrian wind comfort, pollutant dispersion and wind loading, and an introduction to uncertainty quantification for ABL flows. Prerequisites: Knowledge of fluid mechanics.
An introduction to natural ventilation design, including an in-depth discussion of the fluid mechanics of natural ventilation, and a review of models and measurements of naturally ventilated buildings. Overview of the design process, from assessing feasibility to commissioning. Discussion of physical processes in natural ventilation, including buoyancy- and wind- driven flow, and important fluid mechanics and heat transfer concepts and equations. Steady flow characteristics of openings, steady and unsteady envelope models. Internal air motion, zonal models and stratification. CFD and its applications, scale modeling and full-scale measurements. Throughout the course the Y2E2 building natural ventilation system and temperature measurements will be used to illustrate the different concepts and methods.
Day, Time, Location
10:30 AM - 11:50 AM