Animation problem
 

Hello!

I'm modelling a transient two-phase flow in 2D and need to create an animation of the flow. Now the problem is the pipe is too long 15m,and diameter just 0.1. when I create a animation, whole pipe was shown, it looks pipe is too thin to see the detail inside. So I want to animate just part of pipe ,maybe just 2 meter (from 9 to 11 meter). Then I can see how fluid flow.

How should I do?

Thank you in advance.