Structure for the Vortex Lattice Surface tuple = ("Name of Surface", "Value"). "Name of surface defines the name of the surface in which the data should be applied. The "Value" can either be a JSON String dictionary (see Section \ref jsonStringVLMSurface) or a single string keyword string (see Section \ref keyStringVLMSurface). @section jsonStringVLMSurface JSON String Dictionary If "Value" is a JSON string dictionary (eg. "Value" = {"numChord": 5, "spaceChord": 1.0, "numSpan": 10, "spaceSpan": 0.5}) the following keywords ( = default values) may be used:

• groupName = "(no default)"
  Single or list of capsGroup names used to define the surface (e.g. "Name1" or ["Name1","Name2",...]. If no groupName variable is provided an attempted will be made to use the tuple name instead;

• numChord = 10
  The number of chordwise horseshoe vortices placed on the surface. Note: The chordwise count may be overridden using the vlmNumChord BODY attribute on a section.

• numSpanTotal = 0
  Total number of spanwise horseshoe vortices placed on the surface. The vorticies are 'evenly' distributed across sections to minimize jumps in spacings. numpSpanPerSection must be zero if this is set.
  Note: The local spanwise count may be overridden using the vlmNumSpan BODY attribute on a section.

• numSpanPerSection = 0
  The number of spanwise horseshoe vortices placed on each section the surface. The total number of spanwise vorticies are (numSection-1)*numSpanPerSection. The vorticies are 'evenly' distributed across sections to minimize jumps in spacings. numSpanTotal must be zero if this is set.
  Note: The local spanwise count may be overridden using the vlmNumSpan BODY attribute on a section.

• sortVec = [0.0, 0.0, 0.0]
  Vector for sorting airfoil sections.
  By default, section normals are used for sorting.
  However, for LINE sections, a sorting direction is necessary if sorting is desired.

• growthTypeChord = NULL (int)
  Chordwise growth type:
  1 = Uniform spacing
  2 = Successive
  3 = Dual-sided successive
  4 = Reverse Successive
  

• growthRateChord = NULL (double)
  Chrodwise growth rate

• periodicityChord = NULL (int)
  Chrodwise periodicity of the refinement pattern

• growthTypeSpan = NULL (int)
  Spanwise growth type:
  1 = Uniform spacing
  2 = Successive
  3 = Dual-sided successive
  4 = Reverse Successive
  

• growthRateSpan = NULL (double)
  Spanwise growth rate

• periodicitySpan = NULL (int)
  Spanwise periodicity of the refinement pattern

• blendTrailingEdge = false
  Blend blunt trailing edges into sharp trailing edges (does not increase chord)

• startAngle = 0
  Starting angle for revolved surface

• startAngle = 360 (default)
  End angle for revolved surface

Single Value String

If "Value" is a single string the following options maybe used:

• (NONE Currently)