[LuckyTran]

Originally Posted by ma3ou2

can u tell me which one of 2 method is the best?
1-moving train body + crosswind
2-stationary train body + relative wind(cross+oncoming wind)

if 2 method give 1conclusion ?

the stationary train is far easier to setup since you only need to put in the correct velocity (and less likely to make mistakes).

the moving train, is much more complicated. It might involve a dynamic mesh and you will need to fit the entire train inside the computational domain and may or may not involve a transient simulation. It depends on a lot of details of the particular case, but in general the stationary train is just that much easier to do and gives the same results anyway. Why do more work right? Then you can focus on doing it really well.

[Zigainer]

Originally Posted by LuckyTran

the stationary train is far easier to setup since you only need to put in the correct velocity (and less likely to make mistakes).
the moving train, is much more complicated.

Exactly! Just imagine, the critical thing in your simulation is the train. So you have to be sure that your grid is good enough near the train. If your train is stationary and just the wind is going across it its fine. But if your train is moving, you have to move the mesh as well. And the critical part of the mesh is near the train, so therefore the critical part would move .... that's just way too much work to do!

[Anikethan]

Dear ma3ou2,
I am doing a similar project in fluent but on a bus. Did you find out how to do it? if so can you please help me my friend ?

Originally Posted by ma3ou2

hi
i am a student from IRAN and interested to (( modelling crosswind )) on a vehicle.
but i have problem with simulate in fluent.
i need your needs for simulate crosswind.
please help me
with regards