[Artur.Ant]

Hello to everyone. I'm new in CFD and I really need your help.
I'm trying to simulate a flow arround a train in a tunnel so the train is represented by a box and the tunnel by an enclosure.so the problem is same like an elevator problem. The length of the train is 0.7m while the length of the enclosure is 7m in front the train and 7m behind the train. My scheme is: a fixed train in space while air and walls pass by at a constant speed. The walls are moving walls in translational motion relative to adjacent cell zone. The solver is "pressure-based", "k-epsilon Realizable" model with "non-equilibrium wall functions", boundary condition on "velocity inlet" and "pressure outlet", solution methods scheme is:
1) for first 100 iter: "simple" with "first order upwind" for momentum , turbulent Kinetic Energy and Turbulent dissipation rate
2)after 100 iter: "simple" with "second order upwind" for momentum , turbulent Kinetic Energy and Turbulent dissipation rate

Is it a good conditions for my case?

After 2000 iter I got these results:
1)scaled residuals reach the number 1.65e-02 oscillating between 1.6e-02 and 1.7e-02
2)velocity in x,y and z directions reach 1.36e-05, 1.06e-05 and 8.42e-06 respectively with small oscillations arround that values
3)k and epsilon reach 3.7e-05 and 1.02e-04 respectively with small oscillations arround that values.

Can I consider it as convergence?

And also the mesh have to be fixed or I must impose some condition to make it sliding and how to do it?