Change in vertical wind intensity in atmospheric modeling I am a beginner to atmospheric modeling. I want to know about the change in vertical wind intensity in modeling studies. 

In general, if I initiate a simulation,I will get the real vertical wind velocity of that place, or winds with weaker intensity calculated as per the model equations intensifying with each timestep? What are the factors which control it?

I am asking this because I made several setups to study a real time event and I am getting the winds with different intensity. I want to know which of them is right. if I am wrong anywhere, what could be the associated factor that caused it.
It really depends on whether you're model is hydrostatic or not.

If your model is hydrostatic, then the vertical velocity is found diagnostically. The diagnostic algorithm is called the Richardson Equation.

If your model is nonhydrostatic, often it is presumed that the vertical velocity is 0. The vertical velocity is presumed to be 0 (unless you do some spin-up or model restart, or some other special initialization), and the prognostic equation for vertical velocity is found.