V2DOPT
V2DOPT, GEOM, NDIV, HIDOPT, NZONE
Specifies 2D/axisymmetric view factor calculation options.
GEOMChoice of geometry:
0
—
Planar (default).
1
—
Axisymmetric
NDIVNumber of divisions for axisymmetric geometry (that is, the number of circumferential segments). Default is 50. There is no maximum limit if
HIDOPT= 0; the maximum is 90 ifHIDOPT= 1. IfNDIVis ≤ 6, it is reset to 50.For more information, see View Factors of Axisymmetric Bodies in the Mechanical APDL Theory Reference.
HIDOPTViewing option:
0
—
Hidden (default).
1
—
Non-hidden
NZONENumber of zones (that is, the number of rays emanating from a surface) for view factor calculation. This is used if
HIDOPT= 0.If
NZONEis blank, it is set to 0 and the view factor algorithm sets the number of rays. (See Command Default below.)If
NZONEis < 0 or > 1000, it is set to 200.
Command Default
By default, a planar geometry is assumed (GEOM = 0) and the
hidden viewing option is used (HIDOPT = 0).
The view factor algorithm sets the number of rays as follows, depending on whether a planar or axisymmetric geometry is specified:
For
GEOM= 0,HIDOPT= 0 andNZONE= 0, the number of zones used in view the factor calculation is 200.For
GEOM= 1,HIDOPT= 0, andNZONE= 0, the number of zones used in the view factor calculation is 20.
Notes
V2DOPT sets 2D view factor calculation options for the radiosity solver method. For 2D view factor calculations, the ray-emanation method is used.
The geometry type can be either 2D planar (default) or axisymmetric. For the axisymmetric case, you can define the number of circumferential segments (defaults to 20). You can also specify the hidden or non-hidden viewing option (defaults to hidden) and the number of zones for the view factor calculation. For more information, see Process for Using the Radiosity Solver Method in the Thermal Analysis Guide .