A problem has a number of solutions (each with their solver) inside a problem control loop. Problem is associated with region via solution which maps to equations sets and hence links to region. Multiple problems can be in the same region, or multiple regions can work to solve one problem.

Problem has the following attributes:

User number
Global number
Finished tag
Class
Type
Subtype
Control pointer
Number of solutions
Solutions pointer

Solutions

Solution has the following attributes:

Solution number
Finished tag
Linear solution data pointer
Nonlinear solution data pointer
Time (non-static) solution data pointer
Equations set to add (the next equations set to add)
Index of added equations set(the last successfully added equations set)
Solution mapping(which contains equations sets)
Solver pointer

Solvers

Solver has the following attributes:

Solution pointer
Finished tag
Solve type
Output type
Sparsity type
Linear solver pointer
Non-linear solver pointer
Time integrationn solver pointer
Eigenproblem solver pointer
Solver matrices

Control

Control has the following attributes:

Problem pointer
Finished tag
Control type