3.2 Grid-, Model- and Quantity Definitions

After definition of the global sections the system needs more detailed information about the mesh-structure and how to initialize the quantities that are to be calculated. Therefore a grid section has to be defined supporting the following syntax

Grid = <gridname>       # Read a grid named <gridname> from 
                        # the defined source file
{
    <source definition> # overwrite global source definition file
    <model definition>  # initialize the analytical model
    <output definition> # overwrite global output definition file
}

where Grid is a keyword and gridname must be a valid name of a mesh within the chosen source.

As can be seen a local source and output definition is possible but not obligatory. If they are defined, they overwrite the previously defined global sources. The model definition section is a means to map the analytical model defined in the AMI onto the selected grid. To have access to the analytic variables of the model a function-like syntax is used:

Model = <ModelName>(<Q1>,<Q2>,<Q3>,<Q4>,<...>)
{
     <initialize quantities>      # initializing quantities
     <scale quantities>           # scaling of quantities
     <limit quantities>           # set limitations
     <epsilon criterion>          # Newton iteration limit
     <quantity update-mode>       # selective update modes
     <auxiliary definition>       # auxiliary definition 
     <limits for grid-adaptation> # limits for refinement
                                  # and coarsement
}

Again Model is a keyword. ModelName is the name of the discretized analytical model defined in the Analytical Model Interface (described in detail in section 4). Q1,Q2 to Qn are the user defined quantity names that have to be unambiguous for later boundary definitions. Various additional features are definable but only the initialization of quantities is obligatory.

• 3.2.1 Quantity Initialization
• 3.2.2 Scaling of Quantities
• 3.2.3 Damping Initialization
• 3.2.4 Limiting Values