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

Few questions..

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

Like Tree1Likes
  • 1 Post By ApoloV

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 6, 2018, 18:35
Default Few questions..
  #1
New Member
 
Fox
Join Date: Jan 2018
Posts: 2
Rep Power: 0
Norminal is on a distinguished road
I am doing a science project on determining which type of grid fin is ideal for a rocket landing (Grid Fin is a control device similar to a planar fin but is better).

In this case, I would like to know if CFD has the capability to tell me the total force on the grid fin due to the air stream and if it can tell me the total moment of the grid fin due to the air stream.

Thanks
Attached Images
File Type: jpg Capture.jpg (25.0 KB, 24 views)
Norminal is offline   Reply With Quote

Old   January 7, 2018, 08:47
Default
  #2
Senior Member
 
Join Date: Dec 2017
Posts: 153
Rep Power: 8
AliE is on a distinguished road
Hi,
Sure!!!
AliE is offline   Reply With Quote

Old   January 7, 2018, 11:43
Default
  #3
New Member
 
Fox
Join Date: Jan 2018
Posts: 2
Rep Power: 0
Norminal is on a distinguished road
Quote:
Originally Posted by AliE View Post
Hi,
Sure!!!
Perhaps I should have specified. My bad.

I know the wall calculator can calculate torque/force but the problem is, is that I don't know what to select on the model to calculate it.

If I wanted to find the total force on the grid fin itself, do I select the underside and topside of the grid fin only? https://imgur.com/a/xUMOh

What should I select when I want to find the torque on the grid fin? The fin obviously, but do I select the hinge and rocket body? https://imgur.com/a/43HH9
Norminal is offline   Reply With Quote

Old   February 2, 2018, 06:15
Default
  #4
New Member
 
Jon Wilde
Join Date: Dec 2016
Posts: 25
Rep Power: 9
W!ldejon is on a distinguished road
Just select the surfaces that you need to include. We cannot really answer which ones for you, that is for you to decide

But yes, just use the wall calculator.
Be mindful of the mesh quality in models like this...
W!ldejon is offline   Reply With Quote

Old   September 14, 2020, 23:40
Default
  #5
New Member
 
Mike Stroup
Join Date: Sep 2011
Posts: 13
Rep Power: 15
Mithrandir is on a distinguished road
Select all the surfaces in the wall calculator dialogue window and remove the surfaces of the domain.
Mithrandir is offline   Reply With Quote

Old   September 24, 2020, 09:47
Default
  #6
New Member
 
Apolo
Join Date: Jul 2009
Posts: 17
Rep Power: 17
ApoloV is on a distinguished road
One other method would be to use Groups.

Grab different segments of surfaces in the setup side, right-click and Add to Group.

If done prior to running the model, when you go to the Wall Calculator you can just select the group of interest.

That way if you need to run different conditions you don't have to go through the hassle of selecting all the critical surfaces each time.
Mithrandir likes this.
ApoloV 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
Frequently Asked Questions about Installing OpenFOAM wyldckat OpenFOAM Installation 3 November 14, 2023 12:58
Map of the OpenFOAM Forum - Understanding where to post your questions! wyldckat OpenFOAM 10 September 2, 2021 06:29
Wall functions - questions about implementation AlmostSurelyRob OpenFOAM Programming & Development 44 May 6, 2020 11:11
possible interview questions atturh Main CFD Forum 1 February 21, 2012 09:53
NACA0012 Validation Case Questions ozzythewise Main CFD Forum 3 August 3, 2010 15:39


All times are GMT -4. The time now is 10:55.