Topic summary
Air flow
Extracted from the Wikipedia article Airflow.
Simulation
Air flow can be simulated using computational fluid dynamics (CFD) modeling, or observed experimentally through the operation of a wind tunnel. This may be used to predict airflow patterns around automobiles, aircraft, and marine craft, as well as air penetration of a building envelope. Because CFD models "also track the flow of solids through a system," they can be used for analysis of pollution concentrations in indoor and outdoor environments. Particulate matter generated indoors generally comes from cooking with oil and combustion activities such as burning candles or firewood. In outdoor environments, particulate matter comes from direct sources such as internal combustion engine vehicles’ (ICEVs) tailpipe emissions from burning fuel (petroleum products), windblow and soil, and indirectly from atmospheric oxidation of volatile organic compounds (VOCs), sulfur dioxide (SO2), and nitrogen oxide (NOx) emissions.