Solar radiation value through bus windows

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I have more questions:

  1. If I want to see the evolution of the temperature and velocity through time but also at the end, should I use a steady-state or transient model?
    I have different simulations. For example, in a case, a change the velocity value. It is 3 m/s from 0 to 30 minutes, then 2 m/s from 30 to 60 minutes, and finally 1 m/s till the end.

  2. If the element size is 0.025m, what must the time step size be?

Thank you.