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

Propeller in the ATmosphere

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 6, 2011, 12:36
Default Propeller in the ATmosphere
  #1
New Member
 
Mido
Join Date: Mar 2011
Posts: 19
Rep Power: 6
nw_ds is on a distinguished road
Hello MyName is Mohammed

i am still new at this so i appreciate help in as much details as possible

my problem is that i want to do propeller simulation in atmosphere

i made CAD of the propeller in a cylindrical domain
but I have two problems
(1) the BC (inlet , outlet , sides of the cylinder)
(2) the i heard that i need to put not in 1 rotating domain but in 2 domain the outer is stationary and the inner
is rotating

if you need the CAD of the propeller my email is public i can send it for you
thank you very much

I appreciate fast reply thank you
nw_ds is offline   Reply With Quote

Old   March 6, 2011, 18:01
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,926
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
You only need the out stationary domain if it contains some stationary geometry. If you only have the propeller (or everything rotates with it) then just use a single rotating domain.
ghorrocks is offline   Reply With Quote

Old   March 6, 2011, 19:44
Default RE
  #3
New Member
 
Mido
Join Date: Mar 2011
Posts: 19
Rep Power: 6
nw_ds is on a distinguished road
what about the BC ??
nw_ds is offline   Reply With Quote

Old   March 7, 2011, 08:29
Default
  #4
Senior Member
 
Attesz's Avatar
 
Attesz
Join Date: Mar 2009
Posts: 355
Rep Power: 8
Attesz is an unknown quantity at this point
I imagine your problem, and i think you should do these steps:
1. define the rotor domain, which includes only the rotor walls and the air close to it. you dont have to model the solid of the rotor (i assume). Set the rotational domains with the desired rotating velocity
2. define 2 domains at the "inlet" and "outlet" sides of the rotor as stationary domains.
3. there will be 2 interfaces between them, look in the help for frozen rotor and stage options and suggestions
4. i would use opening as boundary condition everywhere, and setting 0 pa relative pressure and environmental temperature. of course you can use inlet and outlet, they are numerically stable except there are backflows (wall placed on...well known issue). use opening first

on the other hand, look in the compressor tutorial, which is very same to yours problem. rotor, compressor wheel...doesn't matter
Attesz is offline   Reply With Quote

Reply

Tags
cfx, propeller

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Propeller calculation toil CFX 14 December 19, 2012 05:12
a propeller 2 way fsi kantored CFX 9 April 11, 2007 14:51
Propeller torque Alex H FLUENT 1 November 1, 2006 07:18
Propeller thrust at diff. advance ratio (CFX 5.7) Zoltan CFX 9 April 27, 2005 08:23
Gambit & Propeller Meshing James Date FLUENT 7 July 6, 2004 16:54


All times are GMT -4. The time now is 10:20.