Intuitive Building Downwash Analysis Tool for AERMOD

Building downwash effects in AERMOD can be both mysterious and counter-intuitive. BREEZE Downwash Analyst takes the cryptic numerical results of AERMOD's BPIP building pre-processor and displays them in the clearest way possible. BREEZE Downwash Analyst takes the mystery out of building downwash and gives you a deeper understanding of your model results, making it an essential tool for any serious AERMOD user.

BREEZE Downwash Analyst Key Features

  • Read in buildings and sources directly from BREEZE AERMOD
  • Visualize buildings, sources, and their downwash effects in 3D
  • View AERMOD/BPIP’s building calculations and overlay the building that AERMOD “sees” over the user-entered buildings
  • Calculate the Good Engineering Practice (GEP) stack height for each building
  • Calculate the overall (maximum) GEP stack height and display the building and wind direction that are responsible for it
  • Display the area around each building within which a stack will be affected by downwash
  • Read outputs from BREEZE AERMOD to visualize exactly what building downwash effects took place at each individual hour of a model run
  • Show which building will be used by AERMOD to calculate downwash effects for a given wind direction
  • Visualize AERMOD/BPIP’s building grouping

Product Tour

GEP Stack Height View

Good Engineering Practice (GEP) stack height is an important concept both in air permitting and in AERMOD air dispersion modeling.  The GEP Stack Height View in BREEZE Downwash Analyst allows the user to view the GEP stack height for a particular stack.  By moving a slider, users can adjust the wind direction to see how the GEP calculations change.  Downwash Analyst also gives a 3D view of the stack, buildings, wind direction, and GEP stack height, making it instantly clear what a stack's GEP... Learn more


Height of Wake Effect View

Two common questions in dealing with building downwash are “How far away would this stack have to move to avoid the downwash of that building?” and “Why does that building affect this stack?”  The Height of Wake Effect (HWE) view in Downwash Analyst provides the answer to both questions.  This view shows the area around a building - downwind, upwind, and to either side - in which it will have an effect on stacks in AERMOD/BPIP.  Another potentially confusing element of AERMOD/BPIP's algorithm... Learn more


BPIP Output Mode

The difference between the actual buildings in a facility, as input into AERMOD by the user, and the buildings that AERMOD sees with its BPIP pre-processor can be very large. Multiple buildings can be grouped into one large building, some building tiers can be ignored, and buildings with complex shapes can be viewed as simple box-shaped structures. The BPIP Output Mode in Downwash Analyst gives the user a clear 3D picture of exactly how AERMOD sees their structures. Learn more


PRIME Plume Rise View

The actual effect that building downwash will have on an emissions plume will depend on many factors, primarily the exit velocity and temperature of the emissions and the current weather conditions.  All of these factors go into AERMOD's PRIME algorithm.  BREEZE Downwash Analyst's PRIME Plume Rise View takes all of these calculations, normally hidden from the AERMOD user, and puts them into the simplest form possible-a 3D image showing the size and shape of the plume during each hour that... Learn more


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