Space Radiation Specification
Description: Specifies a CHBDYi element face for application of radiation boundary conditions.
Format:
Example:
Alternate Format and Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| AMBND | Ambient point for radiation exchange. | Integer > 0 | Required |
| FAMB | Radiation view factor between the face and the ambient point. | Real ≥ 0.0 | Required |
| CNTRLND | Control point for free convection boundary condition. | Integer ≥ 0 or blank | 0 |
| EIDi | CHBDYi element identification number(s). | Integer > 0; EID2 > EID1 | Required |
| INC | Element number increment. | Integer or blank | 1 |
Remarks:
- The basic exchange relationship can be expressed in one of the following forms:
, CNTRLND ≠ 0
, CNTRLND = 0
- AMBND is treated as a black body with its own ambient temperature for radiation exchange between the surface element and space.
- Two PARAM entries are required for radiation heat transfer:
- TABS defines the absolute temperature scale factor used to convert temperature to absolute. (See Section 5, Parameters, for more information on TABS.)
- SIGMA (
) is the Stefan-Boltzmann constant. (See Section 5,
Parameters, for more information on
SIGMA.)
- At least one EID must be present on each QVOL entry.
- If the alternate form is used, all elements EID1 through EID2 that are not compatible or do not exist will be skipped.
- Elements must not be specified more than once.
- All elements directly referenced must exist.
- The continuations are not allowed.