DD Card
Domain decomposition can be used to store parts of a method of moments solution in a file to be reused in future simulations. The stored part must remain static but the rest of the model can change.
On the Solve/Run tab, in the Solution
settings group, click the 
Domains (DD) icon.
Figure 1. The DD - Domain decomposition dialog.
Parameters:
- No data files (normal execution)
- When this option is selected, no data files are read or saved to a .ngf file.
- Save *.ngf file
- The results are saved to a .ngf file.
- Read the *.ngf file
- The results are read from a .ngf file.
- Read *.ngf file if it exists, else create it
- The .ngf file is read if it exists, else a .ngf file is created containing the results.
- Number of element labels
- The number of element labels to be included in the fixed static part.
- Labels of the elements
- The labels of the elements which are to be defined as the fixed static part in the model.
Note: Only a single DD card is permitted in a model.