The physical problem
The physical problem concerns fires in 3-D enclosures.
The movement of combustion products is dominated by buoyancy. Combustion on
the grounds of both single- and multi-fluid SCRS models are included
and non-uniform buoyancy forces are allowed to affect both the mean flow and
fluctuating dispersion.
Case considered
The demonstration case considered
consists of rectangular room with an internal wall and door opening at the front
end of the room. The dimensions of the room are those of the Test Compartement
used by Swedish National Testing Institute for calibration experiments.
It is supposed that a fuel (methane) leaks from the communication system and
enters the room vertically upwards through an aperture located at the floor
in the bottom of the rear wall. In the vicinity of fuel leak, there is a
vent supplying the air for heating and ventilation purposes.
The fuel has ignited on entry and steady combustion is in progress producing
the smoke. The rate of its generation is supposed to be proportional to the
local fuel concentration and non-linearly dependent on temperature.
Flow distribution
The flow pattern induced by the fire is shown by the
streamlines coloured by fuel concentration.
It reveals the salient features of the flow distribution:
Smoke distribution in the room
The simulations predict different locations of the same smoke
concentrations.
Typical fluid-population mass fractions.
