Card 9 - REVNODE or REVNOM Reversed Element Creation

KODE

KODE defines the type of reverse side element creation request.

• KODE = REVNODE (or 13) if the element is merged with its reversed side element.
• KODE = REVNOM (or 1013) if no merging is performed.

N1

N1 is the element or group name whose reverse side is created.

T1

T1 is the element number increment. The element number of the reversed element will be N1 + T1. For T1 = 0, the reverse side element number is automatically assigned.

T2

T2 is the emissivity of the reversed element.

• T2 = SAME (or -99), all its IR spectrum properties are set to the same value as that of element N1.
• T2 = MAT (or –98), then all the reverse side properties, including solar spectrum properties, will be obtained from the reverse side properties of the MAT or OPTICAL Card of the element N1.

T3

T3 is the absorptivity of the reversed element.

• T3 = SAME (or -99), its absorptivity is set to the same value as that of element N1.
• If a solar transmissivity is specified on the front side of the element, TMG will automatically set the solar transmissivity of the reverse side to the same value.

T4

T4 is a group name for the reverse elements created, or is blank.

Code example

REVNODE 100 1000 .06 SAME
$ REVERSE ELEMENT 1100 IS CREATED, E = .06,
$ ABSORPTIVITY = SAME AS 100, AND THE TWO ARE MERGED
$
REVNODE 100 5000 .06 .15
$ REVERSE ELEMENT 5100 OF ELEMENT 100 IS CREATED WITH
$ E = .06 AND ABSORPTIVITY = .15, AND THE TWO ARE MERGED
$
REVNOM TOP 5000 .06 .15 
$ REVERSE ELEMENTS ARE CREATED FOR THE ELEMENTS
$ ASSOCIATED WITH TOP, AND ARE NOT MERGED

Notes

This card creates a reverse side element for each Card 5 element N1. Each new element has the same nodes as N1, but their order is reversed, i.e., the reverse side element's surface normal will point in the opposite direction from N1. Reverse side elements for beams and lump masses are not created.

REVNODE Cards are used to define reverse side elements for radiative enclosures.

The reverse element's thermal conductivity and specific heat are set to 0.

If an element N1 is specified as non-shadowing with a PARAM NOSHADOW Card, its reverse side will also be non-shadowing.