### 3.2.9. CFX-Solver Output File (GGI Runs)

Running the CFX Flow Solver for cases that include GGI interfaces is similar to cases without GGI connections. The following differences, however, will be observed:

- At the start of the simulation, all GGI connection conditions are processed. This may require the computational effort of the order of a single iteration or timestep of the flow simulation. If a GGI connection condition is found to contain non-overlapping portions, the percentage of the area of each side that is non-overlapping is reported. This is a useful diagnostic, and should be reviewed to confirm that the expected amount of non-overlapping area has been detected.

      +--------------------------------------------------------------------+
      |             Total Number of Nodes, Elements, and Faces             |
      +--------------------------------------------------------------------+
      Domain Name : rotor
           Total Number of Nodes                                =       38360
           Total Number of Elements                             =       33202
               Total Number of Hexahedrons                      =       33202
           Total Number of Faces                                =        9970
       Domain Name : stator
           Total Number of Nodes                                =       33320
           Total Number of Elements                             =      106660
               Total Number of Tetrahedrons                     =       75265
               Total Number of Prisms                           =       31395
           Total Number of Faces                                =       17871
       Domain Interface Name : Rotor Periodic
           Non-overlap area fraction on side 1                  =       0.0 %
           Non-overlap area fraction on side 2                  =       0.0 %
       Domain Interface Name : Stator Periodic
           Non-overlap area fraction on side 1                  =       0.0 %
           Non-overlap area fraction on side 2                  =       0.0 %

- Residual diagnostics will be reported for each set of connected domains having the same physical type. For example, the mass and momentum equation residuals will be reported independently for each flow passage.

      ======================================================================
      OUTER LOOP ITERATION =   35                     CPU SECONDS = 4.64E+03
      ----------------------------------------------------------------------
      |       Equation       | Rate | RMS Res | Max Res |  Linear Solution |
      +----------------------+------+---------+---------+------------------+
      | U-Mom-rotor          | 0.92 | 2.2E-05 | 3.6E-04 |                  |
      | V-Mom-rotor          | 0.90 | 3.6E-05 | 1.0E-03 |                  |
      | W-Mom-rotor          | 0.91 | 4.1E-05 | 9.1E-04 |                  |
      | P-Mass-rotor         | 0.94 | 1.2E-05 | 4.7E-04 |                  |
      | U-Mom-stator         | 0.89 | 2.1E-05 | 1.1E-03 |       1.3E-02  OK|
      | V-Mom-stator         | 0.84 | 9.9E-05 | 3.1E-03 |       3.1E-02  OK|
      | W-Mom-stator         | 0.86 | 7.4E-05 | 3.8E-03 |       2.6E-02  OK|
      | P-Mass-stator        | 0.89 | 1.4E-05 | 3.8E-04 | 10.0  6.6E-02  OK|
      +----------------------+------+---------+---------+------------------+
      | H-Energy-rotor       | 0.92 | 7.7E-06 | 2.5E-04 |                  |
      | H-Energy-stator      | 0.88 | 5.4E-06 | 1.7E-04 |  6.1  5.4E-02  OK|
      +----------------------+------+---------+---------+------------------+
      | K-TurbKE-rotor       | 1.62 | 1.2E-04 | 5.7E-03 |                  |
      | K-TurbKE-stator      | 0.86 | 1.1E-04 | 3.5E-03 |  6.1  9.7E-02  OK|
      +----------------------+------+---------+---------+------------------+
      | E-Diss.K-rotor       | 2.52 | 4.0E-04 | 1.6E-02 |                  |
      | E-Diss.K-stator      | 0.87 | 1.8E-04 | 4.9E-03 |  7.5  1.5E-03  OK|
      +----------------------+------+---------+---------+------------------

- Flows across GGI interfaces will be reported in flow summary diagnostics. Changes in GGI flows will occur in various situations. For example, momentum flows change as they undergo rotation at rotational periodic GGI connections. All transport equation flows, including the mass equation, change for the case of pitch change at a frame change GGI connection, as well as the energy equation flows as conservation changes from absolute frame to relative frame energy components. Forces are also reported in the momentum flow balances at contiguous and periodic GGI connections, for cases having non-overlapping portions of the interface.

- Various quantities such as ranges of dependent variables, locations of maximum residuals, and so on, are reported at the end of the simulation on a per-domain basis.

      +--------------------------------------------------------------------+
      |                   Locations of Maximum Residuals                   |
      +--------------------------------------------------------------------+
      |       Equation       |  Node # |     X     |     Y     |     Z     |
      +--------------------------------------------------------------------+
      | U-Mom-rotor          |    5109 | 3.849E-01 | 4.761E-02 | 1.572E-01 |
      | V-Mom-rotor          |    4501 | 3.846E-01 | 5.065E-02 | 1.176E-01 |
      | W-Mom-rotor          |    3085 | 3.802E-01 | 5.029E-02 | 1.177E-01 |
      | P-Mass-rotor         |    3642 | 3.799E-01 | 5.260E-02 | 1.572E-01 |
      | U-Mom-stator         |   32356 | 4.535E-01 | 5.403E-02 | 5.000E-02 |
      | V-Mom-stator         |     496 | 4.541E-01 | 5.343E-02 | 4.939E-02 |
      | W-Mom-stator         |     496 | 4.541E-01 | 5.343E-02 | 4.939E-02 |
      | P-Mass-stator        |    2275 | 4.536E-01 | 5.349E-02 | 4.949E-02 |
      | H-Energy-rotor       |   18527 | 4.535E-01 | 5.694E-02 | 5.263E-02 |
      | H-Energy-stator      |     498 | 4.541E-01 | 5.352E-02 | 4.961E-02 |
      | K-TurbKE-rotor       |    8583 | 4.110E-01 | 4.671E-02 | 5.692E-02 |
      | E-Diss.K-rotor       |    8598 | 4.109E-01 | 4.667E-02 | 5.719E-02 |
      | K-TurbKE-stator      |    7264 | 4.540E-01 | 5.358E-02 | 4.959E-02 |
      | E-Diss.K-stator      |    7264 | 4.540E-01 | 5.358E-02 | 4.959E-02 |
      +--------------------------------------------------------------------+

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