The span is the distance between the hub and shroud, expressed as a fraction between 0 and 1. The span is calculated when m’-Theta coordinates are created. For details, see Transformation Commands and Coordinate Systems.
Ansys TurboGrid uses a span parameter for several reasons related to topology, including:
Obtaining blade metal angles so that Ansys TurboGrid can automatically set topology types after you have specified the topology method:
H/J/C/L-Grid.Calculating an appropriate number of topology blocks between the blade and the periodic interface or interface between blades.
By default, the span location is set to 0.5 (that is,
50% of the span). To adjust the span parameter, called Span
Location, edit the Topology Set object using the
Command Editor dialog box.