Large and Small Time-steps
 

Hello everyone,
I am simulating a transient case and I compare 2 different time-steps sizes, 0.001 s and 0.01 s.
However, after 20 time steps with 0.001 s, the results of a benchmark is X. But, I reach to X with larger time-step (0.01 s) after 10 time-steps.
In fact, the result is X but at different times.
Why that happens?
Am I doing something incorrect?
Thanks to read my post,
Natali

I wanna answer to myself :)
I think it shows that the time-step size that I selected is not correct. Am I right?
If so, how can i select an appropriate time-step size?