Create the "cmas2d.prb" file. This file contains general information for the calculating module, such as the units system for the problem, or the type of resolution algorithm chosen.
Enter the parameters of the general conditions in "cmas2d.prb" using the following format:

PROBLEM DATA
QUESTION: Name of the parameter. If the name is followed by the #CB# instruction, the parameter is displayed as a combo box. The options in the menu must then be entered between parentheses and separated by commas.

For example, Unit_System#CB#(SI,CGS,User).
VALUE: The default value of the parameter.
…
END GENERAL DATA

In GiD, the information in the "cmas2d.prb" file is managed in the problem data window, which is located in Data->Problem Data.

PROBLEM DATA
QUESTION: Unit_System#CB#(SI,CGS,User)
VALUE: SI
QUESTION: Title
VALUE: Default_title
END PROBLEM DATA

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