Card 6r - Enclosure View Factor Request

L

L is the type of view factor calculation request.

• L = VFSENC (or 33) calculates all the view factors with shadowing in an enclosure specified by N1, N2 and FLAG1. Only the elements belonging to the enclosure are checked for potential shadowing, potentially resulting in considerable CPU savings.
• L = VFNENC (or 34) is the same as VFSENC with no shadowing.

N1

N1 may be an element number, a group name, or 0. N1 specifies the elements whose front surfaces belong to the enclosure.

N2

N2 may be an element number, a group name, or 0. N2 specifies the elements whose reverse sides belong to the enclosure. The N2 elements’ reverse sides are specified on Card 9 REVNODE or REVNOM..

FLAG1

FLAG1 may be blank, 0, or SPACE.

• FLAG1 = SPACE (or -4): SPACE specifies that the enclosure contains the space elements as well as the elements specified by N1 and N2.

FLAG2

FLAG2 may be blank, 0, or VFTRACE.

If FLAG2 is VFTRACE, then ray-tracing is performed on the specular and transparent elements of the enclosure according to the rules described for the VFTRACE option of Card 6a.

Code example

 VFSENC FRONT BACK SPACE
 $ ALL VIEW FACTORS IN AN ENCLOSURE DEFINED BY THE FRONT
 $ SURFACES OF THE ELEMENTS FRONT, THE REVERSE SIDES
 $ OF THE ELEMENTS BACK, AND THE SPACE ELEMENT ARE CALCULATED.

Notes

The VFSENC and VFNENC requests are very similar to the view factor request of Card 6a. For more information, see Card 6a - View Factor Request.