Radiation Cavity Identification
Description: Identifies the characteristics of each radiant enclosure.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| ICAVITY | Unique cavity identification number associated with enclosure radiation. | Integer > 0 | |
| ELEAMB | CHBDYi surface element identification number for radiation if the view factors add up to less than 1.0. See Remark 1. | Integer > 0, Unique among all CHBDYi elements | |
| SHADOW | Flag to control third body shading calculation during view factor calculation for each identified cavity, one of the following character variables: YES or NO. See Remark 2. | Character | YES |
| SCALE | View factor that the enclosure sum will be set to if a view factor is greater than 1.0. See Remark 3. | 0.0 ≤ Real ≤ 1.0 | 0.0 |
Remarks:
- For the surface of an incomplete enclosure (view factors add up to less than 1.0), a complete enclosure may be achieved (SUM = 1.0) by specifying an ambient element, ELEAMB. When multiple cavities are defined, each cavity must have a unique ambient element if ambient elements are desired. No elements can be shared between cavities.
- Third-body shadowing is ignored in the cavity if SHADOW = NO. In particular, if it is known a priori that there is no third-body shadowing, SHADOW = NO overrides KSHD and KBSHD fields in the VIEW Bulk Data entry as well as reduces the calculation time.
- The view factors for a complete enclosure may add up to slightly more than 1.0 due to calculation inaccuracies. SCALE can be used to adjust all the view factors proportionately to acquire a summation equal to the value specified for SCALE. If SCALE is left blank or set to 0.0, no scaling is performed.