How to manually set max iterations on Design3D

Sure, here my thoughts:

1) ok, let me know how it goes your investigation.

2) that's pretty normal. Fine scales the residuals to the ones at the first iteration, so the convergence depends on what happens at iteration 1. We rather look at the global data (efficiency etc) and add a control point if needed. When we restart, the scaling can even produce even residuals that are a few orders of magnitude bigger, (+1, +2).

3) you can see residuals for each group if you enable this option in the Control variables box: 

If the simulation doesn't converge well, then I'd look at where the residuals are higher in the Monitor. Otherwise, if the convergence curves for efficiency/pdiff are ok (flat, not oscillating, stable) I'd consider the run ok. Watch out: any oscillations in the p_diff can create _a lot of_ noise on the surrogate model.

Thanks for the reply.

1. I have not identified how that occurred yet. I made a duplicate of that initial simulation. In this duplicate simulation in Fine turbo, I used the old original simulation run file (the simulation that converged to -4 as the initial solution. However, I clicked on the ''reset convergence'' option. With this checked, the simulation converged only to -2.3. Does the screening process reset convergence when it uses the initial fine turbo simulation?

I decided to restart from the beginning after running out of ideas. I imported my impeller parasolid into autogrid, and did a preliminary mesh. I used the geomturbo file outputted from this preliminary mesh as the target model for autoblade. I then parametrized the impeller in autoblade as usual. 

I exported a geomturbo file from this autoblade parametrized impeller. I then opened up autogrid, and initialized an autogrid project from this autoblade exported geomturbo file. I meshed it and then ran a fine turbo simulation using it. However, something peculiar happened- 
the global residual became flat at only -0.8 despite being the same type of geometry as my first few sims that converged at -4. The LE was slightly differed compared to the 1st sim, but the mesh quality was very similar, and the BC were the same. Still working out how that happened. 

2. To be honest how each residual in a cell is collected as one and scaled is abit of a black box to me so I can't quite give an opinion on the 2nd point. I'll be looking into some background and get back to you  

OK, thanks for the feedback. 

JosephSmith said:

Does the screening process reset convergence when it uses the initial fine turbo simulation?

No, it doesn't. Fine Design3D just runs the CFD solver with the options and settings stored saved in the project (and run file).

Wrt the residuals: since there is scaling, the number of iterations on the coarser grids, the initial solution, and CFL have their weight. It is, of course, important to see the residuals going down, but in some cases, just the global residuals don't tell the full story.   

Alright, thanks for the confirmation