*RIGID SURFACE
Set TYPE=CYLINDER to define a three-dimensional rigid surface by provi ding connected
line segments and then sweeping them along a specified generatorvector.
SetTYPE=REVOLUTION to define a three-dimensional rigid surface by providing connected
line segments, which are given in an plane and are rotated about an axis.
Set TYPE=USER to define a rigid surface via user subroutine RSURFU.
Optional parameter:
FILLET RADIUS
This parameter can be used with TYPE=SEGMENTS, TYPE=CYLINDER, or
TYPE=REVOLUTION to define a radius of curvatureto smooth discontinuities between adjoining
straight-line segments, adjoining circular-arc segme nts, and adjoining straight-line and circular-arc
segments. It has no effect on rigid surfaces defined with TYPE=USER.
No data lines are needed for TYPE=USER.
Data lines to define surfaces created with TYPE=SEGMENTS:
First line:
1. The “word” START.
2. GlobalX-coordinate or r-coord inate of the starting point of the line segments.
3. GlobalY-coordinate or z-coordinate of the starting point of the line segments.
Second and subsequent data lines define the various line, circular, and parabolic segments (see
below for their format) that form the profile of the rigidsurface.
Data lines to define surfaces created with TYPE=CYLINDER:
First line:
1. GlobalX-coordinate of point a, the origin o fthe lo cal system (see Figure 17.19–1).
2. GlobalY-coordinate of point a, theorigin of the local system.
3. GlobalZ-coordinate of p oint a, the origin of the local system.
4. GlobalX-coordinate ofpoint bon the local x-axis.
5. GlobalY-coordinate o f point bon the local x-axis.
6. GlobalZ-coordinate ofpoint bon the local x-axis.
Second line:
1. GlobalX-coordinate of point con the local cylinder generator vector.
2. GlobalY-coordinate of point con the local cylinder generator vector.
3. GlobalZ-coordinate of point con the local cylinder generator vector.
17.19–2
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