How do relaxation factors affect calculations? If I use values that are lower than default ones, is my solution "less real"?

thank you in advance

Roberto

The relaxation factors only affect the convergence history, not the final results. The purpose of under-relaxation is to make variable changes less rapidly so that the solution is more stable.

I know that this could seem a stupid question, but wouldn't it be easier just to set a very very low relax. fact. like 0.1? I'm very interested in this topic.

Thanks, Roberto

Yes, you can do that. It's a balance between stability and computing time. If you set very low under-relaxation factor, the solution changes very little by each iteration and it will takes ages to get convergence. The best values should be as close to one as possible while maintaining solution stability.