73d253c34b
Arc-edges can now be specified with a sector angle (in degrees) and an
axis of the circle of which the arc forms a part. The new syntax is as
follows:
edges
(
arc <vertex-0> <vertex-1> <angle> (<axis-x> <axis-y> <axis-z>)
);
This is often more convenient than the alternative specification where a
third third point somewhere in the arc is given; it usually does not
require any additional calculation on the part of the user, and multiple
entries are very likely to be identical.
Which specification is used depends on the form of the entry that comes
after the two vertices. If the entry is a vector then it is assumed to
be a point in the arc; if it is scalar then is is taken to be the angle
and the axis is assumed to follow.
For example, to put a 90 degree arc between the vertices 12 and 13, at
(1 0 0) and (0 1 0) respectively, the following specification can now be
used:
edges
(
arc 12 13 90.0 (0 0 1)
);
This is equivalent to the existing point-in-arc speficiation below:
edges
(
arc 12 13 (0.707107 0.707107 0)
);
An edge's points are ordered on the perimeter of the circle according to
a right-hand screw rule on the given axis. Changing the the side of the
edge on which the arc is defined can therefore be achieved by reversing
either the edge or the direction of the axis.
If the given axis is not perpendicular to the line between the vertices,
then the arc gains some axial length and becomes a helix.
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#
About OpenFOAM
OpenFOAM is a free, open source computational fluid dynamics (CFD) software package released by the OpenFOAM Foundation. It has a large user base across most areas of engineering and science, from both commercial and academic organisations. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics and electromagnetics.
Copyright
OpenFOAM is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version. See the file COPYING in this directory or
http://www.gnu.org/licenses/, for a description of the GNU General Public
License terms under which you can copy the files.