vfopt

Mapdl.vfopt(opt='', filename='', ext='', dir_='', filetype='', fileformat='', **kwargs)

Specifies options for the view factor file and calculates view factors.

APDL Command: VFOPT

Parameters:

opt

View 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.

fname

File name for view factor matrix. Default = Jobname.

ext

Filename extension for view factor matrix. Default = .vf.

dir_

Directory path for view factor matrix. If you do not specify a directory path, it will default to your working directory.

filetype

View factor file type:

BINA

Binary (default).

ASCI

ASCII.

fileformat

Format 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).

Notes

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.