CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS

fan fluid flow with cover and wall

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 5, 2016, 11:37
Default fan fluid flow with cover and wall
  #1
New Member
 
Michele
Join Date: Sep 2016
Location: Italy, Portugal
Posts: 11
Rep Power: 8
dottorbiker is on a distinguished road
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
Attached Images
File Type: png motore intero.PNG (130.5 KB, 3 views)
File Type: png motore senza cover.PNG (119.7 KB, 3 views)
File Type: png parte da simulare.PNG (56.9 KB, 3 views)
dottorbiker is offline   Reply With Quote

Old   September 8, 2016, 17:31
Default
  #2
New Member
 
Michele
Join Date: Sep 2016
Location: Italy, Portugal
Posts: 11
Rep Power: 8
dottorbiker is on a distinguished road
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.
Attached Images
File Type: png Cattura.PNG (78.6 KB, 4 views)
File Type: png Cattura1.PNG (73.8 KB, 3 views)
File Type: jpg Cattura2.jpg (70.1 KB, 7 views)
File Type: jpg Cattura3.jpg (77.7 KB, 5 views)
dottorbiker is offline   Reply With Quote

Reply

Tags
cfx, fan analysis, fluent, fluid flow

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
having trouble implementing airfoil with Wall Slip condition Khozaei4000 CFX 10 December 22, 2014 07:21
GETVAR Error in Multiband Monte Carlo Radiation Simulation with Directional Source silvan CFX 3 June 16, 2014 10:49
Error unsolved: "Unable to solve the local rotating region" Rian FloEFD, FloWorks & FloTHERM 12 October 23, 2012 04:23
Pipe wall temperature Fred Uckfield Main CFD Forum 25 May 22, 2000 15:37


All times are GMT -4. The time now is 20:50.