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

ANSYS CFX: Produce swirling flow using cylindrical components

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 6, 2010, 10:49
Default ANSYS CFX: Produce swirling flow using cylindrical components
  #1
Member
 
Neil Duffy
Join Date: Mar 2010
Posts: 34
Rep Power: 16
neilduffy1024 is on a distinguished road
Hi, I want to mimic swirling flow into a furnace using cylindrical components in the boundary conditions. I want to specify a mass flowrate followed by the flow direction. The axis of rotation will be specified as two points.

There is no decription in the user guides how the theta component is used. When selecting the cylindrical velocity components the units are for linear velocity, ie m/s etc, which obviously depends on the distance from the axis of rotation, yet there is no description in the user guides of how CFX accounts for this. Can the theta component be specified in terms of an angular velocity, ie radians/s, or as a linear velocity dependent on the distance from the axis of rotation, ie a velocity profile, perhaps using a CEL expression? If so, is there a simpler/more efficient method of describing this than through user Fortran?

Any help would be greatly appreciated.

Thanks,

Neil

Last edited by neilduffy1024; July 7, 2010 at 10:22.
neilduffy1024 is offline   Reply With Quote

Old   June 4, 2013, 18:18
Default
  #2
Member
 
Michal
Join Date: Dec 2012
Posts: 39
Rep Power: 13
magnusDux85 is on a distinguished road
I have the same question. I want to mimic swirling flow in the injector.
magnusDux85 is offline   Reply With Quote

Old   June 5, 2013, 07:02
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,655
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Not sure if you can specify this using a rotating boundary coordinate system. Have a look and try it.

But it is easy to set this up as CEL expressions. A bit of maths to work out, that's all.
ghorrocks is offline   Reply With Quote

Old   August 7, 2013, 08:52
Default
  #4
Member
 
Michal
Join Date: Dec 2012
Posts: 39
Rep Power: 13
magnusDux85 is on a distinguished road
Quote:
Originally Posted by ghorrocks View Post
Not sure if you can specify this using a rotating boundary coordinate system. Have a look and try it.

But it is easy to set this up as CEL expressions. A bit of maths to work out, that's all.
Have you ever tried, could you give us some details?
magnusDux85 is offline   Reply With Quote

Old   August 7, 2013, 09:00
Default
  #5
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,655
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
No, never needed to do it so I have never done it.

But my second point is that it is easy to write it in the global coordinates, the transformation from cylindrical to global cartesian coords is pretty simple. So if it cannot be done in cylindrical coords then do it in global coords.
ghorrocks is offline   Reply With Quote

Reply

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
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 07:27
ANSYS CFX Tutorial Rashid CFX 25 December 20, 2012 02:22
ANSYS Multi-physics and CFX coupling error anujit CFX 3 June 21, 2009 19:39
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 22:31
Flow Visualization of impinging swirling flow on the wall. sangaria Main CFD Forum 2 March 26, 1999 14:31


All times are GMT -4. The time now is 00:06.