A data file consists of two parts.
The first part contains the data that you specified through Ansys Polydata during the problem definition (including default settings that you did not modify). When you read a data file into Ansys Polydata, only the information in this first part will be read.
The second part contains information that is used only by Ansys Polyflow.
For example, variables that are introduced implicitly based on your selection of a
particular boundary condition in Ansys Polydata will appear in this second part as fields.
Also, all numerical parameters appear in the second part of the data file. If you
are examining a data file and want to see the different parts, the first part of the
data file is contained between the keywords BEGIN PA3MN and
ENDOF PA3MN, and the second part is contained between
the keywords BEGIN OPEN and ENDOF
OPEN.
An incomplete problem definition cannot be saved to a data file, but can instead be saved to a session file. This session file contains only the first part of the data file, so it can be read only by Ansys Polydata. See Reading and Writing Ansys Polydata Session Files for details.