The Variables Section

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The VARIABLES section is used to define and assign names to all the primary dependent variables used in a problem descriptor.  All names appearing in the VARIABLES section will be represented by a finite element approximation over the problem mesh.  Each variable is assumed to define a continuous scalar field over the problem domain.  It is further assumed that each variable will be accompanied by a partial differential equation listed in the EQUATIONS section.

 

In assigning names to the dependent variables, the following rules apply:

 

•Variable names must begin with an alphabetic character.   They may not begin with a number or symbol.
•Variable names may be a single character other than the single character t, which is reserved for the time variable.
•Variable names may be of any length and any combination of characters, numbers and/or symbols other than reserved words.
•Variable names may not contain any separators.  Compound names can be formed with the '_' symbol (e.g. temperature_celsius).
•Variable names may not contain the '-' which is reserved for the minus sign.

 

Example:

VARIABLES

U,V