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

Mesh motion

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 12, 2006, 10:47
Default Mesh motion
  #1
jon
Guest
 
Posts: n/a
Hi again all, Is it possible to apply a rotation to an object using the mesh deformation and the specified displacment? I can only see x,y,z components but i need to rotate my object?

any idas?
  Reply With Quote

Old   October 12, 2006, 12:23
Default Re: Mesh motion
  #2
Joe
Guest
 
Posts: n/a
Of course it's possible, you just need to use the specified motions correctly.
  Reply With Quote

Old   October 12, 2006, 12:25
Default Re: Mesh motion
  #3
opaque
Guest
 
Posts: n/a
Dear Jon,

Use CEL expressions for the x,y,z displacement components.. Those expressions would use the transformation from cylindrical components to cartesian components.

Then it should just work.

Good luck,

Opaque.

PS. You could also raise the issue with ANSYS CFX for an enhancement request.. Then, you would have to wait until ANSYS CFX 12.0..
  Reply With Quote

Old   October 12, 2006, 14:32
Default Re: Mesh motion
  #4
jon
Guest
 
Posts: n/a
You lost me opaque! All I seem to be able to do is a transformation. COuld you explain a little further.

Thanks Jon
  Reply With Quote

Old   October 12, 2006, 14:49
Default Re: Mesh motion
  #5
opaque
Guest
 
Posts: n/a
Dear Jon,

Your specified displacement must be a function of time as well. Otherwise, the displacement is a one shot transformation. You already saw that!!!

You can then control the angle of rotation at will.. For example, constant angular velocity, or variable angular velocity, or based on another metric such a total force on a blade.. It is up to you, basically.

Good luck,

Opaque
  Reply With Quote

Old   October 12, 2006, 15:05
Default Re: Mesh motion
  #6
jon
Guest
 
Posts: n/a
Thanks for the speedy reply! I understand that and currently have a simple sin function to move my body and transform in the x,y,z coords.

I am currently doing it through pre using expressions. How can i model the rotation e.g. a door opening? I see nowhere to specify my rotation in the mesh motion fields?
  Reply With Quote

Old   October 12, 2006, 15:39
Default Re: Mesh motion
  #7
Robin
Guest
 
Posts: n/a
Hi Jon,

You need to transform the rotation into the associated x, y, and z components. Simple trig.

Regards, Robin
  Reply With Quote

Old   October 12, 2006, 15:45
Default Re: Mesh motion *NM*
  #8
jon
Guest
 
Posts: n/a
  Reply With Quote

Old   October 13, 2006, 07:38
Default Re: Mesh motion *NM*
  #9
jon
Guest
 
Posts: n/a
  Reply With Quote

Old   October 13, 2006, 07:41
Default Re: Mesh motion
  #10
jon
Guest
 
Posts: n/a
Firstly appologies for the blank threads, keep clicking wrong button!

I understand trig but that cannot help, using specified displacment in my mesh motion tab it is just going to tranform my shape and whatever i enter it will never rotate? There is no option for cylindrical coords.
  Reply With Quote

Old   October 15, 2006, 19:04
Default Re: Mesh motion
  #11
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

Make the mesh diaplacement transformation a function of the original node location, then each node gets a different transformation and you can model rotations and other arbitrary motions.

Glenn Horrocks
  Reply With Quote

Old   October 16, 2006, 11:00
Default Re: Mesh motion
  #12
jon
Guest
 
Posts: n/a
Thanks everyone, greatly appreciated. I know have a rotating object. great stuff,

  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
how to set periodic boundary conditions Ganesh FLUENT 15 November 18, 2020 07:09
Mesh motion with Translation & Rotation Doginal CFX 2 January 12, 2014 07:21
3D Hybrid Mesh Errors DarrenC ANSYS Meshing & Geometry 11 August 5, 2013 07:42
Dynamic moving mesh Pei-Ying Hsieh (Hsieh) OpenFOAM Running, Solving & CFD 64 June 7, 2012 11:04
Mesh motion on inlet (2-way FSI) Lance CFX 2 August 13, 2009 06:31


All times are GMT -4. The time now is 04:34.