I had a look at all your simulation ‘FORCES’ plots (in the post-processor tab > FORCES tree item ) and except for your very first run of your first simulation, all the force plots look very stable after about ~500 iterations (seconds or s).
I would reduce your ‘End time value [s]’ to say ~700 for this mesh for future runs on the mesh and then after the run, make sure that your forces are stable at that point. You can also try setting the ‘Absolute value’ for the residuals to stop it before 700s but that is likely not worth it.
No need to have a high End time value [s] when forces are stable at ~500s.
Set your ‘Maximum runtime [s]’ (which I think of as ‘Maximum realtime[s]’) to the max real time you want to let the run go to before it stops, in case it does not converge or reach the max iterations you set.
Your other option is to set very high End time value [s] and ‘Maximum runtime [s]’ , and then sit there and watch for convergence, both by low residuals and by obtaining stable forces, at which point just stop the simulation manually. If you so this, make sure you set maximum real time to <(3600*yourcorehrsleft/#coressimistouse). If you do not do this the simulation will appear stuck and not start and give you no error message. If this happens, just delete the stuck run and try a smaller max runtime that fits the formula above until it does start.
Simulation Runs will stop for mostly these 4 reasons;
- ALL Residuals have decreased to their individual ‘Absolute tolerance’ in ‘Numerics’ > ___ Residual Control > ‘Properties’. This is known as convergence.
- The run has reached the maximum iteration you set in ‘Simulation Control’ > ‘End time value [s]’, whether converged or not at this point.
- The real time of the run has reached the ‘Simulation Control’ > ‘Maximum runtime [s]’ that you set, whether converged or not at this point.
- The user stops the simulation manually.
In all those cases, the results should still get written and have a post-processor tab tree item created for them. (at least at the last write interval you have selected in each ‘Results Control Item’ > ‘Write Control’ > ‘Details’)
If you want to make sure that the mesh you use is giving you the highest accuracy you can expect, then you should do a Mesh Independence Study on it.
NOTE; I think the true test of convergence is whether your forces are stable and even then you can not be sure of their accuracy unless you are sure of your simulation setup and the Mesh independence of your mesh. AND then that accuracy should be confirmed with experimental results if possible (I know that somewhat defeats the purpose of CFD but as long as you don’t stray too far from examples that have proven to be close to experimental results, you can be somewhat confident in CFD results without having to compare to experimental results).
Hope that helps.