Learning Forum

[Raghuvaran Chinchedu]

Hi, 

In case of Transient analysis, does Max Iterations/ Time Step value will affect the solution.

What is its significance.

[Rob]

It's the maximum number of iterations that can be solved for a time step. If you hit the limit without converging the time step there's a good chance the solution will not be accurate. Ideally, you want a time step such that you hit the convergence criterion in 10-ish iterations, but don't do less than 2-3 to ensure the solution is actually updating. 

[Raghuvaran Chinchedu]

Thanks Rob, What could be the maximum limit, without much affecting the solution accuracy.   

[Rob]

Of iterations? There isn't one: the aim is to converge each time step. What you're aiming for is to get through time with as few iterations as possible. That means balancing many small time steps with few iterations with fewer large time steps with many iterations.