hi

i think that more the transient timestep is smaller more the solution is converging,but the simulation gave me something else ,where the one with the larger timestep converged better?

any comment , would help me.

thanks

Hi,

This is pretty basic stuff, sounds like you need to read a basics of CFD textbook.

In short, ideally the simulation should converge towards the exact answer as the timestep size goes to zero. In reality, you reduce the timestep until the error is down to an acceptable level.

If your simulation changes significantly with different timestep sizes you need to keep going smaller until it does not change to an accuracy tolerance you are happy with.

Glenn Horrocks

Hey everybody,can i know how to choose the number of time steps plz? thank you in advance