This data is used in both ApacheSim and in external CFD assessments in MicroFlo. The terrain types define how the wind speed will vary with height, dependant upon the local terrain. These definitions are based on ASHRAE 2001 wind speed profiles. This data affects the natural ventilation air exchange rates when MacroFlo is run in conjunction with ApacheSim and the external convective losses in ApacheSim. In MicroFlo the velocity profile changes with height in relation to the choice of terrain type.
