3D Connexion Version 6.6

*RADIATION VIEWFACTOR

17.6 *RADIATIONVIEWFACTOR: Control cavity radiation and viewfactor calculations.

This option is used to control the calculation of viewfactors during a cav ity radiation analysis.

Product: ABAQUS/Standard

Type: History data

Level: Step

Reference:

•“Cavity radiation,” Section 32.1.1of the ABAQUS Analysis User ’sManual

Optional parameters:

BLOCKING

Set BLOCKING=ALL (default) to specifythat full blocking checks be performed in the viewfactor

calculations.

Set BLOCKING=NO to specify that no blocking checks be performed in the viewfactor

calculations.

Set BLOCKING=PARTIAL to specify that partial blocking checks be performed in the

viewfactor calculations. The data lines are then used to specify the potentialblocking surfaces.

CAVITY

Set this parameter equal to the name of the cavity for which radiation viewfactorcontrol is being

speciﬁed. If this parameter is om itted, the speciﬁcation applies to all cavities deﬁned in the model.

OFF

Includethis parameter to switch off cavity radiation effects. Cavity radiation effects can be switched

on again by a subsequent use of this option without the OFF parameter. Ifthis parameter is omitte d,

cavity radiation is active.

RANGE

Set this parameter equal to a distance beyond which viewfactors need not be calculated because

surfaces are judged to be too far apart to “see” each other (due to blocking by other surfaces).

REFLECTION

SetREFLECTION=YES (default) to indicate that reﬂection must be included in the cavity radiation

calculations.

Set REFLECTION=NO to indicate that reﬂection is to be ignored in the cavity radiation

calculations. No re��ection corresponds to the special case of black body radiation (see “Cavity

radiation,” Section 2.11.4of the ABAQUS Theory Manual).

17.6–1

ABAQUS Version 6.1 Module: ID:

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