A point leak is a leak released from a single control volume and where the leak area normally is smaller than the area of a control volume face.

If you do not specify a leak box size in the input (i.e. if the size remains zero in all dimensions), then the leak is defined in FLACS as a point leak.

You still need to specify all the other parameters, as for any type of leak; these parameters are:

  • the position of the leak,
  • open sides (specifying the direction of the release),
  • start time, and
  • duration.

In addition, the outlet parameters such as the

  • leak area,
  • mass flow rate,
  • velocity,
  • relative turbulence intensity,
  • turbulence length scale,
  • temperature, and
  • direction cosines

have to be given. The mass flow rate and the velocity are related quantities and only one of these can be specified independently. If both the mass flow rate and the velocity parameters are given then the mass flow rate will take precedence.


The article What are Leaks has general information about leaks.