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!RADIATE

Definition of radiation factor given to boundary plane

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) ELEMENT_GRP_NAME, LOAD_type, Value, Sink
Parameter Name Attributions Contents
ELEMENT_GRP_NAME C/I Element group name or element ID
LOAD_type C Load type No.
Value R Radiation factor
Sink R Ambient temperature

Example of Use

!RADIATE
RSURF, R1, 1.0E-9, 800.0
!RADIATE, AMP2=TRAD
RSURF, R1, 1.0E-9, 1.0

Load Parameters

Load Type No. Applied Surface Parameter
R1 Surface No. 1 Radiation factor and ambient temperature
R2 Surface No. 2 Radiation factor and ambient temperature
R3 Surface No. 3 Radiation factor and ambient temperature
R4 Surface No. 4 Radiation factor and ambient temperature
R5 Surface No. 5 Radiation factor and ambient temperature
R6 Surface No. 6 Radiation factor and ambient temperature
R0 Shell Surface Radiation factor and ambient temperature

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.