Because, that is the ORSI value that is the solvers best guess, we should present the full solution set of data that would integrate the viscous and pressure drag on all the geometry surface faces to the same value as ORSI is…
Actually at 4 significant digits it is 0.2188, not 0.2187
If you just take the full set solution data at the last iteration at it would integrate in ParaView to CD of 0.2175 as you see here:
Which is 0.6% different in this case (you were lucky, on data that oscillates more we have seen that it could be 5-10% off)…
I am using the ORSI at 1558 0.93% but we have to look back to find an iteration that matches our best ORSI % stable, which is 1521.
Splitting hairs you could use 1538 0.90%, but I am sure that last iteration 0.93% is fine and easier to understand as a procedure, and there is an argument that can be made that the last iteration ORSI at high MA iterations is always the best guess of that sim run.
Also, I really want to stay close to that last iteration for scrutiny purposes (that goes for how MUCH earlier we find a close iteration, I would rather choose a close iteration at 0.2189 than a further away iteration at 0.2188)
As far as my ‘at high MA iterations’ edit I made above goes… My procedure for determining how large a MA iteration value to use, is currently, that the MA line (non-yellow line) should be horizontal at the end of it, if the MA line is not stable (horizontal) at the end, then you should lower the MA iteration value or run the sim to more iterations… The MA iterations value determines how well oscillations are filtered out of the data.