Previous Topic | Next Topic | Contents | Commands by Function |
Commands Alphabetically |
VOlfr [ [*]FILENAME ] N L
[ Xmin Xmax Ymin Ymax Zmin Zmax ] [ 0 ]
The volume fraction calculation does not work well with body geometry;
the use of surface geometry is strongly encouraged.
If Sabrina detects an error when calculating volumes in a mesh cell, the
listing for that cell is preceeded with an E
.
*FILENAME
FILENAME
.
If no name is given, the fractions are written to file volfr
.
If the file exists, Sabrina will prompt whether or not to overwrite the
file unless the name is volfe
, in which case it will be
overwitten without prompting. If not in quotes, the name, including the
asterisk, is limited to
16 characters. If quoted, the limit is 64 characters.
if *
is present, the volume
fractions are not output to the shell window. The asterisk can be
present even if the file name is omitted.
Xmin ... Zmax
0
0
is present,
fractions are given for material 0 (and material IDs < 0).
Otherwise, these fractions are omitted.
N L
VOLFR
is a three-dimensional subdivision of space along material boundaries.
The depth of the 3D binary subdivision is determined by
L
.
Computer time requirements increase as a large power of
L
. Hint: use
L
= 2 or 3 initially
and then gradually increase L
until the numerical results are acceptable. When the subdivision
equals L
, then a volume exists
containing more than one material. The fractional components of the
volume are estimated with a ray-tracing technique. For each sub-volume
containing more than one material, N
x N
rays are shot across the volume.
The fraction of the ray going through each material becomes the
corresponding estimate of the volume fraction of the material.