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!RADIATE

Defines the radiation coefficient applied to a boundary surface.

Parameters

AMP1 = radiation coefficient history table name (specified with !AMPLITUDE)
AMP2 = ambient temperature history table name (specified with !AMPLITUDE)

** Second and subsequent lines **

(2nd line) ELEMENT_GRP_NAME, LOAD_type, Value, Sink
Variable Type Description
ELEMENT_GRP_NAME C/I Element group name or element number
LOAD_type C Load type number
Value R Radiation coefficient
Sink R Ambient temperature

Example

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

Load Parameters

Load type number Applied surface Parameter
R1 Surface 1 Radiation coefficient and ambient temperature
R2 Surface 2 Radiation coefficient and ambient temperature
R3 Surface 3 Radiation coefficient and ambient temperature
R4 Surface 4 Radiation coefficient and ambient temperature
R5 Surface 5 Radiation coefficient and ambient temperature
R6 Surface 6 Radiation coefficient and ambient temperature
R0 Shell surface Radiation coefficient and ambient temperature

Notes

  • Radiation boundary conditions are based on the Stefan-Boltzmann law, and the heat flux is calculated by converting the temperature to absolute temperature. The absolute zero used for the conversion is specified by !ZERO in the mesh file, not in the analysis control file.
  • When temperatures are entered in degrees Celsius, !ZERO may be omitted (default value: -273.15). When temperatures are entered in kelvins, specify 0.0 for !ZERO.
  • Value (radiation coefficient) must also be specified in the same unit system as the input temperature.

See Also