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

Moving mesh with butterfly valve

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 21, 2009, 11:24
Default Moving mesh with butterfly valve
  #1
New Member
 
Join Date: Oct 2009
Posts: 13
Rep Power: 17
uorinopuot is on a distinguished road
Hello. I have been modelling a butterfly valve on cfx 12. I try to make the valve rotate by some range of angles but i cannot make it since in the options there are only displacement and location. I used displacement under cylindrical coordinates and i managed to get deformation around the axis i wanted but half the valve was going up and half down, ie not rotating. Any ideas?
uorinopuot is offline   Reply With Quote

Old   October 21, 2009, 18:19
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Do I understand you by saying the valve does not rotate (eg a throttle butterfly in a car) but has two sections which rotate in different directions to throttle the flow? An image might help explain what you mean.

Assuming you are talking about a twin-pivot butterfly, I see several options:
1) Use one rotating frame of reference for the top valve and another for the bottom.
2) Use the immersed solid feature
3) Use deforming mesh - this would be quite difficult to do and it does not appear to be the best option.
ghorrocks is offline   Reply With Quote

Old   October 21, 2009, 18:38
Default
  #3
New Member
 
Join Date: Oct 2009
Posts: 13
Rep Power: 17
uorinopuot is on a distinguished road
Hello,

No the valve is a single one. I just tried to describe it as two parts each on one side of the axis. Anyway, I looked further into it and now what i did was to create a second domain (solid) which is the valve. I made a domain interface between the fluid and the valve and now i have a different problem. I use moving mesh and at the same time try to rotate the domain of the valve. Only that rotates though, not the fluid domain...
What i have looks mich like the bottom bit from this page.
http://www.ansys.com/assets/tech-bri...oving-mesh.pdf

Thanks
uorinopuot is offline   Reply With Quote

Old   October 21, 2009, 22:39
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
I see, you are modelling a normal butterfly valve then.

You do not want to model the valve as a solid. That will not work (unless you use the immersed solid feature).

My recommendations are still unchanged:
1) Use a rotating frame of reference for the valve and connect it to the rest of the passage with a GGI OR
2) Use the immersed solid feature OR
3) Use a deforming mesh.

Which is the best option will depend on exactly what you are modelling.
ghorrocks is offline   Reply With Quote

Old   October 24, 2009, 10:22
Default
  #5
New Member
 
Join Date: Oct 2009
Posts: 13
Rep Power: 17
uorinopuot is on a distinguished road
Okay I'll see what i can do. Thanks lot
uorinopuot is offline   Reply With Quote

Old   November 1, 2009, 07:30
Default
  #6
New Member
 
Xue-Guan Song
Join Date: Mar 2009
Location: Busan, Korea
Posts: 14
Rep Power: 17
songxguan is on a distinguished road
Quote:
Originally Posted by uorinopuot View Post
Okay I'll see what i can do. Thanks lot
ghorrocks is right,
you can build two domain, one is flow field without valve, and the other one is a circle domain containing butterfly valve, then connect them with GGI. and then, what you should do is write a CEL to control the domain containing valve to rotate a expected angle.

some details you can refer to a journal paper:
<Dynamic analysis of three-dimensional flow in the opening process of a single-disc butterfly valve>
http://www.springerlink.com/content/vq5472u30686p9w6/
songxguan is offline   Reply With Quote

Old   May 28, 2010, 06:54
Default butterfly valve
  #7
New Member
 
euzinho
Join Date: May 2010
Posts: 15
Rep Power: 16
euzinho is on a distinguished road
Hi dear
I am trying to solve the same problem but using fluent, and I donīt have any idea how to do in order to get it done...
How can I make this valve rotate?

any help?

thanks in advance
euzinho is offline   Reply With Quote

Old   May 28, 2010, 06:58
Default butterfly valve
  #8
New Member
 
euzinho
Join Date: May 2010
Posts: 15
Rep Power: 16
euzinho is on a distinguished road
I take this oportunity to upload the model by .jpg
so, I wonder how to rotate the valve
thanks
Attached Images
File Type: jpg Dibujo.jpg (92.4 KB, 107 views)
euzinho is offline   Reply With Quote

Old   May 28, 2010, 08:57
Default
  #9
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
You are using Fluent. Try the Fluent forum.
ghorrocks is offline   Reply With Quote

Old   February 8, 2011, 01:20
Default butterfly valve vane movement
  #10
New Member
 
Archana
Join Date: Jul 2010
Posts: 10
Rep Power: 16
Archana is on a distinguished road
I am using solid works flow efd..
I have trouble in moving the vane to various location..
how do we calculate the CV torque and other values for butterfly valve any information would be of great help
Archana is offline   Reply With Quote

Old   February 8, 2011, 06:15
Default
  #11
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
What is flow efd? Sounds like you are on the wrong forum too.
ghorrocks is offline   Reply With Quote

Old   February 8, 2011, 08:25
Default Butterfly Valve
  #12
New Member
 
Archana
Join Date: Jul 2010
Posts: 10
Rep Power: 16
Archana is on a distinguished road
its flow simulation..
its an add on in solid works.
Which is used for simulation ...
A detatiled "How to do CFD analysis in a butterfly valve ?" is what i am looking for..
It would be kind of you if you could help me...
Thanks and regards
Archana
Archana is offline   Reply With Quote

Old   February 8, 2011, 18:22
Default
  #13
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
In that case you definitely have the wrong forum. This forum discusses CFX. Try the general CFD forum.
ghorrocks is offline   Reply With Quote

Old   February 24, 2011, 15:03
Default
  #14
New Member
 
ALEJANDRO VELASCO
Join Date: Oct 2010
Posts: 3
Rep Power: 16
andro is on a distinguished road
Hi, I use a solid immersed to simulate a butterfly valve, and I He obtains good results, however I have a doubt why that seems to be immersed solid permeable (part of the fluid is able to pass through it)?
andro is offline   Reply With Quote

Old   February 24, 2011, 20:07
Default
  #15
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Immersed solids work by using a momentum source. You will need to adjust the momentum source scaling factor to stop the flow going through the solid.
ghorrocks is offline   Reply With Quote

Old   February 25, 2011, 00:16
Default
  #16
New Member
 
Archana
Join Date: Jul 2010
Posts: 10
Rep Power: 16
Archana is on a distinguished road
IS immeresed solid another software ? what are the steps involved in doing a cfd analysis in a butterfly valve
Archana is offline   Reply With Quote

Old   February 25, 2011, 06:40
Default
  #17
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
No, immersed solids is part of CFX. There is a tutorial example of how to use it.
ghorrocks is offline   Reply With Quote

Reply


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
Moving Mesh David Siemens 16 July 27, 2009 10:52
Moving mesh Martijn CFX 3 November 26, 2008 22:46
VOF with a moving mesh Jeremie FLUENT 1 November 26, 2008 09:55
moving mesh haribalan CFX 1 June 6, 2006 09:26
C4 = 1 for Moving Mesh Xobile Siemens 2 January 18, 2005 06:22


All times are GMT -4. The time now is 17:45.