[dottorbiker]

Hi,
I'm new here and I hope that I'm writing in the right section.
I want to simulate the problem in figure, the air flow on a fan with a cover around and a wall behind (in the two first pictures you can see the complex problem, in the third pictures what I want to simulate...I've simplified a lot!).

I have read a lot on internet but I'm a bit confused.
the best solution for me is use ansys CXF or ansys FLUENT (with sliding mesh?!)? I have some doubts about the accuracy of the methods (finite elements VS finite volumes).

Should I use ansys turbogrid?

And about the boundary condition: I don’ t know neither the mass flow nor the velocity inlet…what I have to do?

I definitely need something accurate but I can't waste too time because I have to a lot of simulation with different types of fan.

Thanks a lot

Michele

PS: on you-tube I’ve found those tutorial, one with the sliding mesh method, on with CFX…I think that both are my case but…I need to put some other components!

sliding mesh video:
https://www.youtube.com/watch?v=KFrZ...Gu5GEg&index=2
CFX video:
https://www.youtube.com/watch?v=hZfX...Q7FqxhryGu5GEg

[dottorbiker]

hi, I've spent days on YouTube and I’ve read kilometres…
I have performed several simulations with CFX following two different procedure (video) …. but really different results are shown:

1) based on this video: https://www.youtube.com/watch?v=l5IJEpPDyxs , a transient simulation… I haven’t understood why the boundary conditions are not set.
2) based on https://www.youtube.com/watch?v=Oi7H...Gu5GEg&index=7 , steady simulation, immersed solid with rotating frame(MRF model???!!!). Because I don’t know anything about the fluid I’ve set the BCs in in-Ptot=0 (relative pressure), out-Pstatic=o (relative).it’s ok?
So…what is ok?
please link me some tutorial that can help me.
I’m on the right way?
can I mesh my problem with turbogrid? I’m not able to create the boundary layers and I think that check a good y+ it is very important…. please tutorial!
And finally. Could you link me please tutorial to create an axial fan? I think that vista AFD makes for me…. but I have not find any tutorial.

Thanks a lot
Michele

About pictures: the first two are to understand the problem, the third one for the transient case, and the last one for the steady case.