At convergence, the following should be satisfied:
- All discrete conservation equations (momentum, energy, etc.) are obeyed in all cells to a specified tolerance OR the solution no longer changes with subsequent iterations.
- Overall mass, momentum, energy, and scalar balances are achieved.
- Monitoring convergence using residual history:
- Generally, a decrease in residuals by three orders of magnitude indicates at least qualitative convergence. At this point, the major flow features should be