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!SRADIATE

Definition of radiation factor by surface group

Parameter

AMP1 = Radiation factor history table name (specified in !AMPLITUDE)
AMP2 = Ambient temperature history table name (specified in !AMPLITUDE)

** 2nd line or later **

(2nd line) SURFACE_GRP_NAME, Value, Sink
Parameter Name Attributions Contents
SURFACE_GRP_NAME C Surface group name
Value R Radiation factor
Sink R Ambient temperature

Example of Use

!SRADIATE
RSURF, 1.0E-9, 800.0
!SRADIATE, AMP2=TSRAD
RSURF, 1.0E-9, 1.0

Note:

  • The radiation boundary condition is based on the Stefan-Boltzmann law, and the temperatures are converted into absolute temperatures. The absolute zero-point used for the conversion is given by !ZERO in the mesh file, not in the analysis control file.
  • When the input temperatures are in Celsius, "!ZERO" can be omitted (default -273.15). When they are in Kelvin, define "!ZERO" as 0.0.
  • Value (radiation factor) must also be given in the same unit system as the input temperatures.