Card 6q - Spinning Request

L

L is the type of spinning request.

• L = SPINALL (or 32) calculates all solar, earth, albedo, and black body view factors for a model that is in a spinning motion.
• L = SPIN1 (or 31) calculates all solar, earth, albedo, and black body view factors for elements N1 that are in a spinning motion.

N1

N1 is a group name for SPIN1 option. It is 0 for the SPINALL option.

NPOS

NPOS is the number of positions per spin. The minimum NPOS value is 2.

VECTOR

VECTOR is the vector number referencing VECTOR card 9. This vector defines the spinning axis.

TIME

TIME is either blank or the flag CONSTANT. TIME = blank defaults to CONSTANT.

Code example

 SPINALL 0 8 10 CONSTANT
 
 VECTOR 10 0, 0, 0, 0, 0, 1
 
 $ THE MODEL SPINS ABOUT VECTOR 10

Notes

If a SPIN1 or SPINALL card is specified, the solar, earth, albedo view factors, and black body view factors are averaged over each spin position.

If two or more objects, defined on different SPIN1 cards, are spinning then it is assumed that these objects are moving at the same spin rate.

Spinning is not allowed on more than one spin axis.

If SPIN1 cards have different number of spinning positions, a single NPOS value (the maximum of all) will be used for all cards.

Spinning can be used in a model along with other features, such as articulation, ray-tracing, thermal couplings, hemicube and deterministic methods for view factor calculation, etc.