VFOPT, Opt, Filename, Ext, Dir, Filetype, Fileformat
Specifies options for the view
factor file and calculates view factors.
OptView factor option:
NEW | — | Calculate view factors and write them to a file. |
OFF | — | Do not recalculate view factors it they already exist in the database, otherwise calculate compute them. This option is the default behavior. |
READ | — | Read view factors from a binary file. For subsequent SOLVE commands, switch to the default option (OFF). |
NONE | — | Do not write view factors to a file. |
FnameFile name for view factor matrix. Default = Jobname.
ExtFilename extension for view factor matrix. Default = .vf.
DirDirectory path for view factor matrix. If you do not specify a directory path, it will default to your working directory.
FiletypeView factor file type:
BINA | — | Binary (default). |
ASCI | — | ASCII. |
FileformatFormat for the specified Filetype:
Binary files (Filetype = BINA):
0 | — | No compression. (View factor file size may be very large.) |
1 | — | Zeroes are compressed out. (Useful for large models to reduce the view factor file size.) |
ASCII files (Filetype = ASCI):
0 | — | 10F7.4 (low precision, lower accuracy). |
1 | — | 7F11.8 (high precision, higher accuracy). |
The VFOPT command allows you to deactivate
the view factor computation (Opt = OFF)
if the view factors already exist in the database. The default behavior
is OFF upon encountering the second and subsequent SOLVE commands in the solution processor.
When Opt = READ, only a previously
calculated view factor binary file is valid.
For 3-D analyses, two options are available for calculating view factors when running Distributed ANSYS:
Issue a SOLVE command -- View factors are calculated in parallel mode if no view factors were previously calculated.
Issue a VFOPT,NEW command -- View factors are calculated in serial mode.
For 2-D analyses, view factors are calculated in serial mode.