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

6DOF motion of rigid body in ANSYS-CFX14

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 28, 2013, 21:46
Default 6DOF motion of rigid body in ANSYS-CFX14
  #1
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Hi
I want to model a merged body in water flow in CFX and it needs to remeshing. Can I use the ICEM for remeshing in this problem?
The motion of rigid body in this case contains rotation and translation together. Can anyone help me?
Thanks.

Last edited by Spring.s; August 5, 2013 at 04:12.
Spring.s is offline   Reply With Quote

Old   July 29, 2013, 01:16
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,862
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Yes, you can remesh using ICEM.

If you explain what you are trying to do maybe we can help you.
ghorrocks is offline   Reply With Quote

Old   July 29, 2013, 04:50
Default
  #3
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Thanks Glenn for your response
I want move the merged cubic in the flow that contains translational and "rotational" movement.
I have read that ICEM supports translational movement only, is it true or ICEM is capable to remeshing rotational movement?
What's your suggestion between ICEM and WORKBENCH's remeshing?
Best regards
Spring.s is offline   Reply With Quote

Old   July 29, 2013, 09:05
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,862
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
I have not used either remeshing techniques so cannot answer you. Hopefully some others on the forum can answer this.
ghorrocks is offline   Reply With Quote

Old   July 29, 2013, 10:33
Default
  #5
Senior Member
 
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
Rep Power: 21
singer1812 is on a distinguished road
ICEM can do what you are asking. But the remesh is USER DEFINED.

I assume your motion is not fully prescribed, but rather part of the solution. In that case when you interrupt for a your whatever condition you are interrupting for, send the results file to pre to get the latest geometry, write out a def file, read that def file into icem, convert the mesh to faceted geometry, blow away the new mesh, remesh the geometry, write out the new mesh and continue.

If you dont know ICEM scripting, this can be daunting. Contact ANSYS support for an example.
singer1812 is offline   Reply With Quote

Old   July 31, 2013, 13:27
Default
  #6
Member
 
Mohamad Alagheband
Join Date: Oct 2012
Posts: 41
Rep Power: 14
MUMMED is on a distinguished road
Quote:
Originally Posted by singer1812 View Post
ICEM can do what you are asking. But the remesh is USER DEFINED.

I assume your motion is not fully prescribed, but rather part of the solution. In that case when you interrupt for a your whatever condition you are interrupting for, send the results file to pre to get the latest geometry, write out a def file, read that def file into icem, convert the mesh to faceted geometry, blow away the new mesh, remesh the geometry, write out the new mesh and continue.

If you dont know ICEM scripting, this can be daunting. Contact ANSYS support for an example.
dear singer
i agree with you that's an option but i think there are more options
i believe workbench re-meshing is more helpful because you don't need watch the solving process and re-meshing works automatically.as far as i know ICEM does not support re-meshing for rotational motion (cfx_ref page 70)
i suppose workbench re-meshing is more general.
MUMMED is offline   Reply With Quote

Old   August 14, 2013, 03:38
Default
  #7
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Quote:
Originally Posted by singer1812 View Post
ICEM can do what you are asking. But the remesh is USER DEFINED.

I assume your motion is not fully prescribed, but rather part of the solution. In that case when you interrupt for a your whatever condition you are interrupting for, send the results file to pre to get the latest geometry, write out a def file, read that def file into icem, convert the mesh to faceted geometry, blow away the new mesh, remesh the geometry, write out the new mesh and continue.

If you dont know ICEM scripting, this can be daunting. Contact ANSYS support for an example.


Hi Singer1812
Do you mean that I read def file by the ICEM for any remesh of domain and so repeat remeshing?
While after the remeshing step by CFX and stopping solution, don't see rotational movement of body in def file! In other word, geometry returns to the first state and don't remesh for rotational movement.
Best regards
Spring.s is offline   Reply With Quote

Old   August 14, 2013, 09:28
Default
  #8
Senior Member
 
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
Rep Power: 21
singer1812 is on a distinguished road
You need to pass the geometry through CFXPRE first. ICEM cant read the updated geom after mesh motion in a run. You bring the res file into pre, it will have the right geom update, and then write out a def file that will be pulled into ICEM.
singer1812 is offline   Reply With Quote

Old   August 17, 2013, 05:12
Default
  #9
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Quote:
Originally Posted by singer1812 View Post
You need to pass the geometry through CFXPRE first. ICEM cant read the updated geom after mesh motion in a run. You bring the res file into pre, it will have the right geom update, and then write out a def file that will be pulled into ICEM.


Hi Singer1812
Thank you for your replay
So, do you tell me for every remeshing process, we must repeat this steps?
Can't it performs automatically?
Best regards
Spring.s is offline   Reply With Quote

Old   August 21, 2013, 10:17
Default
  #10
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Dear Singer1812, I don't know how prepare the script file for send the res file to pre and write out a def file. Can you help me?
Thanks

Last edited by Spring.s; August 23, 2013 at 14:26.
Spring.s is offline   Reply With Quote

Old   August 21, 2013, 10:18
Default
  #11
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Quote:
Originally Posted by singer1812 View Post
ICEM can do what you are asking. But the remesh is USER DEFINED.

I assume your motion is not fully prescribed, but rather part of the solution. In that case when you interrupt for a your whatever condition you are interrupting for, send the results file to pre to get the latest geometry, write out a def file, read that def file into icem, convert the mesh to faceted geometry, blow away the new mesh, remesh the geometry, write out the new mesh and continue.

If you dont know ICEM scripting, this can be daunting. Contact ANSYS support for an example.




Dear Singer1812, I don't know how prepare the script file for send the res file to pre and write out a def file. Can you help me?
Thanks
Spring.s is offline   Reply With Quote

Old   August 21, 2013, 12:43
Default
  #12
Senior Member
 
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 277
Rep Power: 21
brunoc is on a distinguished road
Quote:
Originally Posted by Spring.s View Post
Dear Singer1812, I don't know how prepare the script file for send the res file to pre and write out a def file. Can you help me?
Thanks
Both CFX-Pre and ICEM can record your steps, but if you don't know where to start those tools will not be very helpfull. You'll also need some scripting to get the mesh back and forward between Pre and ICEM.

As Singer already said, this is not a straighforward thing to do and definitely not something that can be done through here. You really should contact you local ANSYS support team to help you with this.

Cheers,
Bruno
brunoc is offline   Reply With Quote

Old   August 22, 2013, 07:15
Default
  #13
New Member
 
Adrian
Join Date: Jul 2013
Location: Dublin
Posts: 21
Rep Power: 14
adunne304 is on a distinguished road
Would it not be easier just to use the mesh deformation tool within CFX?
__________________
www.idacireland.com
adunne304 is offline   Reply With Quote

Old   August 23, 2013, 12:04
Default
  #14
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Quote:
Originally Posted by brunoc View Post
Both CFX-Pre and ICEM can record your steps, but if you don't know where to start those tools will not be very helpfull. You'll also need some scripting to get the mesh back and forward between Pre and ICEM.

As Singer already said, this is not a straighforward thing to do and definitely not something that can be done through here. You really should contact you local ANSYS support team to help you with this.

Cheers,
Bruno


Hi brunoc
Thanks for your replay. I do translational movement with ICEM but I can't remesh rotational movement. Via append the commands to already rpl file in Icem may be prepare some sectional of remeshing, isn't it?
Does it need to other scripts?

Best regards
Spring.s is offline   Reply With Quote

Old   August 23, 2013, 12:12
Default
  #15
New Member
 
Join Date: May 2011
Posts: 22
Rep Power: 15
Spring.s is on a distinguished road
Quote:
Originally Posted by adunne304 View Post
Would it not be easier just to use the mesh deformation tool within CFX?



I need to remesh for this case because that inclusive great mesh deformation.
Spring.s is offline   Reply With Quote

Old   September 24, 2014, 10:32
Default
  #16
New Member
 
Gwen Yang
Join Date: Sep 2014
Posts: 13
Rep Power: 12
gwen520 is on a distinguished road
Hello,Spring.s have you solve your problem? I am now modeling a reciprocating compressor, and I also have to get the mesh regenerated. However, Ieven don't know how to handle the translational part,can you give me some help?
gwen520 is offline   Reply With Quote

Old   September 30, 2014, 06:25
Default
  #17
New Member
 
Felix
Join Date: Dec 2012
Posts: 7
Rep Power: 13
Lesson is on a distinguished road
Hi Gwen

Sorry. I didn't understand.
What kind of problem do you have ???
Do you want remesh your geometry? Or Have you problem with movment of the piston?

Thanks
Fely
Lesson is offline   Reply With Quote

Old   December 27, 2015, 08:19
Default
  #18
New Member
 
Gwen Yang
Join Date: Sep 2014
Posts: 13
Rep Power: 12
gwen520 is on a distinguished road
HI Lesson
Previously, I have problem remeshing my geometry.
Now I have already solved the translational part
gwen520 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
how to constrain rigid body motion MUMMED CFX 13 April 13, 2020 14:47
Accelerated Body Motion Simulation reza1111 Main CFD Forum 2 June 3, 2013 10:00
Rigid body motion error when restarting a terminated FSI simulation lingdeer ANSYS 1 May 19, 2013 02:40
Rigid body - pivoting about a fixed point Catenary CFX 0 April 26, 2012 03:07
Rigid Body Motion Setup for Tesla Turbine me3840 FLUENT 0 October 26, 2011 18:54


All times are GMT -4. The time now is 12:21.