CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FloEFD, FloWorks & FloTHERM

swirl flow in FolwWork Simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 23, 2011, 06:20
Question swirl flow in FolwWork Simulation
  #1
New Member
 
Larry Lin
Join Date: May 2011
Posts: 2
Rep Power: 0
linsir0825 is on a distinguished road
Hi All

I have a question about the swirl flow setting.When I let the Fan inlet be a swirl flow,FlowWork Simulation will ask me to enter two value
1. Angular Velocity
2. Radial Velocity

Angular Velocity is the Fan rotation speed ????
And how to calulate the Radial Velocity ???
linsir0825 is offline   Reply With Quote

Old   June 7, 2011, 05:02
Default
  #2
Senior Member
 
Boris Marovic
Join Date: Jul 2009
Posts: 365
Rep Power: 11
Boris_M is on a distinguished road
Hi Larry,
if you define a swirl flow in a regular boundary condition your flow has three components, the axial (perpendicular to the inlet surface), the angular velocity which is the rotating speed (RPM or rad/s) as you can see from the units and the radial velocity is the velocity you have in radial direction in case the fan creates not a cylindrical flow but a cone like flow outwards like diagonal fans do.

For a regular "Fan curve"-Fan you have to set the angular velocity and the radial velocity as it is not defined in the fan data and the axial velocity is corresponding to the fan curve unlike for a regular boundary condition where there is not a fan curve related to.

For an "Axial Fan"-Fan from the database the angular velocity is defined in the database settings of the fan as rotating speed and the radial velocity is calculated from the inner and outer hub diameter which describe the two hub diameters on both sides of the fan. If they are not the same, you would define a diagonal fan if they are the same it is a straight blowing axial fan. So here these values are defined and calculated from the database.

I hope this helps,
Boris
Boris_M is offline   Reply With Quote

Reply

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
Swirl diffuser flow lpy2009 FLUENT 2 January 8, 2015 03:20
Help with slug flow simulation. Kes FLUENT 2 May 27, 2008 04:48
Problems about multi swirl tubes simulation using Jason FLUENT 4 May 9, 2008 00:33
Expert parameter to stop the fluid flow simulation KK CFX 1 February 25, 2008 17:29
2D Flow Simulation Sethu Raghavan Main CFD Forum 0 October 18, 2001 01:12


All times are GMT -4. The time now is 03:14.