Built on the roof, a Badgir captures wind from any direction and guides it to the occupant’s zones.

badgir persian gulf windcatcher wind tower CFD simulation
badgir persian gulf windcatcher wind tower CFD simulation

In persian, Bad = wind... Gir = to catch... thus, Badgir or Windcatcher.

Iranian wind towers are designed to introduce cool outside air, driven by relatively high wind pressure.
The internal partition allows the low pressure on the lee side of the tower to suck air from inside the building.

This Badgir is designed with 4 air ducts.

Under the air pressure, one end of the tissue goes down, while by the extraction, the other end goes up towards the exit.

The diagram of the same Badgir in the shape of an "X".

badgir persian gulf windcatcher wind tower CFD simulation

The turbulence induces hot air extraction outwardly from the opposite channels.

badgir persian gulf windcatcher wind tower CFD simulation

Operation of a Badgir during the day and at night.

badgir persian gulf windcatcher wind tower CFD simulation

Marine breezes direction reverses between day and night.

badgir persian gulf windcatcher wind tower CFD simulation