Fire event attributes

1.   On the Lists menu, click > Measurements > Fire Events.

The Fire Events list opens.

Note: In lists, you can use the  Attribute selection icon to show and hide attribute values (Selecting attributes and subattributes for columns of a list).

The list contains, amongst others, the following attributes:

Short name Long name Description

No.

Number

Unique number

Name

Name

Name of the fire event

FDSFileName

FDS filename

Name of the *.fds file that the fire event data is stored in. In the list box, click the file name to show the path to the directory.

Level

Level

Name of the level at which the fire event is inserted

x

  X coordinate of the position of the fire event

y

  Y coordinate of the position of the fire event

ZOffset

z-offset

Height above the level of the position of the fire event [m]

YawAngle

Yaw angle (around z-axis)

Angle of rotation of the fire event around the z-axis

TimeOffset

Time offset

Time offset of the FDS simulation to the simulation time of Vissim / PTV Viswalk

Other columns contain specific FDS data. The names of the columns correspond to FDS conventions. The short name and the long name are identical. When you open the *.inpx network file, the relevant data is read from the *.fds file specified in the FDS Filename attribute.

Name Description

FDS_CHID

Prefix for the file name of the result file

FDS_DT

Time interval, sets FDS by default to: Size of a grid cell / flow velocity

FDS_DT_PL3D

Time interval during which FDS data were saved in the *.fds file, default value in FDS: 1000000 s

FDS_MAXIMUM_VISIBILITY

Maximum visibility, default value in FDS: 30 m

FDS_T_BEGIN

Start time of simulation from FDS, optional, default value in FDS: 0

FDS_T_END

Duration of FDS simulation, default value in FDS: 1 s

FDS_VISIBILITY_FACTOR

Constant C is used as a factor for the calculation of visibility. Default value in FDS: 30 (no unit). As the value decreases, the perception as a reflective object increases, with a higher value as an object that emits light.

Showing and editing dependent objects as relation

The attribute and attribute values of this network object type are shown in the list on the left, which consists of two coupled lists.

1.  In the list on the left, click the desired entry.

The list on the right contains attributes and attribute values of network objects, and/or base data allocated to the network object selected in the list on the left (Using coupled lists):

  • FDS Mesh (Attributes of FDS meshes)
  • Plot3D Quantities: Result data of quantities from the FDS simulation covering the entire FDS mesh. For further information on FDS output quantities, please refer to the FDS User Manual. The number of quantities shown in Vissim/PTV Viswalk depends on the *.fds file, for example:
  • TEMPERATURE: Temperature [°C]
  • V-VELOCITY, U-VELOCITY, W-VELOCITY: The velocity of the three gas components u, v, w in [m/s]
  • HRRPUV (Heat Release Rate Per Unit Volume): Heat expansion in [kW/m³]
  • AEROSOL VOLUME FRACTION: Soot [mol/mol]
  • VOLUME FRACTION (OXYGEN): If not specified by the Plot3D quantity, a constant volume fraction of oxygen of 20.9% is assumed.

  • VISIBILITY: Visibility [m]

In the graphic parameters of the fire event, you can select a quantity and display it in the network editor (Graphic parameters for visualizing fire events).

Superordinate topic:

Fire event based on an FDS file

Information on editing:

Defining fire events