the cold air will first be felt by ones feet as a result of the outside air propagating as a gravity current along the floor of the room.Doorway flows are of interest in the domain of natural ventilation and air conditioning/refrigeration and have been extensively investigated.

Modelling approaches

Box models

For a finite volume gravity current, perhaps the simplest modelling approach is via a box model where a "box" (rectangle for 2D problems, cylinder for 3D) is used to represent the current. The box does not rotate

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