PEGASUS 5 User's Guide
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Section 6: APPENDICES




APPENDIX A: Glossary

Term Definition
Donor Mesh Mesh that provides information by interpolation to another mesh.
Field Point A point within computational domain(IBLANK=1) that is updated by the flow solver or boundary conditions.
Fringe Point A hole boundary point.
Hole Collection of hole points, i.e., points in a mesh that have been blanked.
Hole Boundary Collection of hole boundary points (fringe points) surrounding a hole.
Hole Boundary Point Point on a hole boundary, by definition a point between a hole point and field point.
Hole Map A cartesian grid that has been developed to cut minimum holes.
Hole Point A mesh point that has been specified to be within a hole. This point is considered to be out of the computational domain (IBLANK=0).
Interpolated Boundary Point A hole boundary point or outer boundary point that is interpolated from another mesh (IBLANK<0).
Interpolated Boundary Point Cell The cell adjacent to an interpolated boundary point in the a positive J, K, and L direction. At the maximum mesh dimensions, the cell in the negative J, K or L direction is used.
Interpolation Stencil or Stencil The eight mesh points of an element in a donor mesh that surround a interpolated boundary point.
Orphan Point Boundary point for which a valid interpolation can not be found in any mesh.
Outer Boundary Collection of outer boundary points.
Outer Boundary Point A point in a mesh that has been specified directly to be interpolated (typically this point is on the outer boundary of a mesh, not the extreme boundary of the domain).
Recipient Mesh Mesh that receives information from another mesh.
Region Collection of one or more volumes.
Stencil Point One of the eight points making up an interpolation stencil.
Valid Interpolation An interpolation where all eight mesh points of the interpolation stencil are field points (not hole or interpolation boundary points).
Volume Group of points defined by J, K, and L index ranges. Collections of one or more volumes comprise a region.






APPENDIX B

Example of PEGASUS Input File (peg.in)

(3-Element Airfoil)




EXAMPLE 1 - Automatic Hole Cutting and Outer Boundary Specification:

The following input file relies on the automatic definition of the minimum hole cutter, which uses all of the solid walls to cut holes out of all of the zones.


$GLOBAL
  PROJECT = .F.,
  LEVEL2 = .T.,
  FRINGE = 2,
  CNY = 3,
  OFFSET = 2,
  $END
$MESH
  NAME = 'slat',
  $END
$MESH
  NAME = 'main',
  $END
$MESH
  NAME = 'flap1',
  $END
$MESH
  NAME = 'flapte1',
  $END
$MESH
  NAME = 'wake',
  $END
$BCINP
  ISPARTOF = 'slat',
  IBTYP = 5, 51, 21,
  IBDIR = 2, 2, 3,
  JBCS = 15, 2, 1,
  JBCE = 107, 14, -1,
  KBCS = 1, 1, 1,
  KBCE = 1, 1, -1,
  LBCS = 1, 2, 1,
  LBCE = -1, -2, 1,
  $END
$BCINP
  ISPARTOF = 'main',
  IBTYP = 5, 47, 47, 21, 47, -1,
  IBDIR = 2, 1, -1, 3, -2, 2,
  JBCS = 121, 1, 321, 1, 1, 231,
  JBCE = 231, 1, 321, -1, -1, 232,
  KBCS = 1, 1, 1, 1, -1, 1,
  KBCE = 1, 101, 101, -1, -1, 1,
  LBCS = 1, 2, 2, 1, 2, 1,
  LBCE = -1, -2, -2, 1, -2, -1,
  $END
$BCINP
  ISPARTOF = 'flap1',
  IBTYP = 5, 21,
  IBDIR = 2, 3,
  JBCS = 21, 1,
  JBCE = 121, -1,
  KBCS = 1, 1,
  KBCE = 1, -1,
  LBCS = 1, 1,
  LBCE = -1, 1,
  $END
$BCINP
  ISPARTOF = 'flap1te',
  IBTYP = 5, 21,
  IBDIR = 1, 3,
  JBCS = 1, 1,
  JBCE = 1, -1,
  KBCS = 4, 1,
  KBCE = 28, -1,
  LBCS = 1, 1,
  LBCE = -1, 1,
  $END
$BCINP
  ISPARTOF = 'wake',
  IBTYP = 5, 5, 47, 21, -1,
  IBDIR = 1, -2, -1, 3, -2,
  JBCS = 1, 1, 151, 1, 61,
  JBCE = 1, 61, 151, -1, 62,
  KBCS = 1, 61, 1, 1, -1,
  KBCE = 61, 61, 61, -1, -1,
  LBCS = 1, 1, 2, 1, 1,
  LBCE = -1, -1, -2, 1, -1,
  $END



EXAMPLE 2 - Automatic Hole Cutting Using Three Separate Hole Cutters:

By adding these $HCUT namelist inputs to the input file in the previous example. These namelists define three hole-cutting surfaces, one for the slat, one for the main wing, and one for the flap.

$HCUT NAME = 'slathole',
  MEMBER = 'slat',
  INCLUDE = 'main',
  $END
$HCUT NAME = 'winghole',
  MEMBER = 'main', 'wake',
  INCLUDE = 'slat', 'flap1',
  $END
$HCUT NAME = 'flap1hole',
  MEMBER = 'flap1', 'flap1te',
  INCLUDE = 'main', 'wake',
  $END


APPENDIX C

Obsolete Inputs



The following inputs were available in versions of PEGSUS 4.1 but are no longer accepted as inputs in PEGASUS 5.1.
 

NAMELIST Obsolete Input
$GLOBAL QUALITY
$MESH LINK, ADDLINK, ADDHOLE, QUALITY

PEGASUS 5 User's Guide
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