A final state is retained when the settings remain unchanged for 20 iterations,
the continuity residual is below 1e-3, each engineering-monitor relative span
is below 0.02%, and the mass and heat balances meet the limits below.
Continuity is the only equation residual used as an explicit scalar acceptance
gate because it is the slowest-decaying residual in the retained SST final
window. At iteration 217, the other monitored equation residuals were already
at or below 1.27e-5, while continuity was 9.76e-4; at iteration 236 they
were all below 6.84e-6 while continuity was 6.66e-4. The complete residual
histories are still inspected and plotted. The acceptance rule therefore does
not treat continuity < 1e-3 as sufficient by itself: the engineering monitors
and conservation checks below must also pass. This is a project-specific
acceptance rule, not a universal Fluent convergence threshold.
The active continuity criterion was first met at iteration 216. The calculation continued for 20 iterations with the same second-order settings.
| Check | Result | Limit |
|---|---|---|
| Continuity residual | 6.6568e-04 |
1e-3 |
| Outlet-Mach span | 0.004506% |
0.02% |
| Mean-wall-temperature span | 0.000124% |
0.02% |
| Heat-rate span | 0.001741% |
0.02% |
| Relative mass imbalance | 0.0000509% |
0.01% |
| Fluid-solid interface mismatch | 0.00000558% |
0.01% |
| Solid heat imbalance | 0.001921% |
0.05% |
Maximum wall y+ |
0.45189 |
1.0 |
The solid receives 35,819.602 W/m through the external interface and rejects
35,818.914 W/m through the internal convection boundaries, leaving
0.688 W/m.
| Final residual window | Engineering monitors |
|---|---|
 |
 |
The case starts from the fine SST field. The transition equations changed to Second Order Upwind at iteration 386.
| Check | Result | Limit |
|---|---|---|
| Continuity residual | 5.4279e-05 |
1e-3 |
| Outlet-Mach span | 0.000539% |
0.02% |
| Mean-wall-temperature span | 0.000065% |
0.02% |
| Heat-rate span | 0.000354% |
0.02% |
| Relative mass imbalance | 0.0001503% |
0.01% |
| Fluid-solid interface mismatch | 0.0000191% |
0.01% |
| Solid heat imbalance | 0.0001889% |
0.05% |
Maximum wall y+ |
0.398393 |
1.0 |
| Engineering monitors | Final second-order residuals |
|---|---|
 |
 |
The source monitor, residual and balance exports are under
data/fluent_exports/ and data/fluent_exports/transition_sst/.