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

Selecting Wall Cells for Drag Force

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 12, 2005, 12:26
Default Selecting Wall Cells for Drag Force
  #1
Mr. Javidan Ahmad
Guest
 
Posts: n/a
I am currently investigating the aerodynamics of a motorcycle. The Geometry was created in Pro-Engineer and using Pro-Am manipulation, resulted in obtaining a domain with a hollow centre - where the hollow centre represents the wall of the bike.

However, in order to obtain the Drag force on the motorcycle i am required to select the surface cells which are on the motorcycle.

Currently, using the typical procedures (selcting cells, zones, based on edges etc) it is too time consuming and cumbersome to select the cells as a separate wall boundary.

It is required to select the wall surfaces of the motorcycle as a separate wall boundary as the default wall boundary (boundary region 0 - zero) does not allow the selection of forces in the monitor boundary behaviour menu (Analysis Controls>output controls>monitor engineering b>monitor boundary behaviour)

If anyone can advise me on what steps i can take to select the cells i require or any other method of working out the drag i would extremely appreciative.

Kind regards, Mr.Javidan Ahmad.
  Reply With Quote

Old   May 12, 2005, 20:59
Default Re: Selecting Wall Cells for Drag Force
  #2
Ant
Guest
 
Posts: n/a
If you have any shell-type cells, you can always convert them in any boundaries! Look at the command "bshell,....."
  Reply With Quote

Old   May 13, 2005, 10:31
Default Re: Selecting Wall Cells for Drag Force
  #3
Javidan Ahmad
Guest
 
Posts: n/a
Dear Ant,

1.Thank you very much for your help.

2. I have had a look a the BSHELL command, and as far as i can see in order to use this command i require shell-cells on the boundary at which i intend to monitor the Drag force. However, due to the manner in which Pro-Am creates the Fluid Cells, there are no Shell cells at the location of the hollow centre (i.e bike geometry).

3. If anyone has any other suggestions please post a reply.

Kind regards, Javidan Ahmad.
  Reply With Quote

Old   May 13, 2005, 22:20
Default Re: Selecting Wall Cells for Drag Force
  #4
Ant
Guest
 
Posts: n/a
You can create shell cells using Pro*am! Use the panel Generate Mesh->Extrusion Layer, in which activate the CREATE SURFACE TO EXTRUDE radio button! Then use the Method as Entire Surface and push the button Create Surface! As a result you get a shells around all outside surfaces to the fluid cells! Now you have to separate unnecessary shells using typical commands of Prostar or Pro*am! And what is your aim? Monitoring forces at the time of computing or integrating the obtained results?
  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
Drag force in CFX anand CFX 0 November 8, 2008 05:44
Drag force Iain CFX 3 October 12, 2008 09:00
Drag force Iain CFX 0 September 21, 2008 03:16
drag force Al Mazdeh CFX 0 April 17, 2008 09:07
DPM drag force UDF hedonists FLUENT 0 March 12, 2003 22:10


All times are GMT -4. The time now is 07:43.