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

Questions about rotate immersed solid and mesh deformation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 15, 2013, 10:57
Question Questions about rotate immersed solid and mesh deformation
  #1
New Member
 
Jingyao Wang
Join Date: Jun 2013
Posts: 29
Rep Power: 4
wjy-c is on a distinguished road
Hi, I知 trying to simulate water splash in box baused by gear rotating. I知 new to CFX and I have tried several times, but the results turn out that the water volume fraction is no right., so I will be appreciated for your help.
(1) I read the CFX help document, I noticed that the immersed solid would not interact properly with mutiphase fluid. Since I concerned about the water and airdistribution caused by rotating gear, does the help document means I cannot use immersed solid for my simulation?
(2) I try a gear in a box model and the simulation result seems correct. But I did not define mesh deformation, I知 wondering wether or not the meshdeformation must be defined in situation like mine, I suppose the mesh deformation is required, but how to explain my successful simulatin in the first time.
P.S.
English is not my native language, so I may understand and express mistakely , so please corret me if I made some mistake. Thank you very much!
wjy-c is offline   Reply With Quote

Old   June 16, 2013, 06:34
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,941
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
The documentation states that immersed solids do not interact properly with multiphase flow. I do not thing immersed solids is a good way to do this simulation. If the gear rotates then you might be able to do it with a rotating frame of reference. This is quite easy and fully supports multiphase flows. Note you do not need mesh deformation for this approach - which is a big help as it complicates the simulation a lot.
ghorrocks is offline   Reply With Quote

Old   June 17, 2013, 07:56
Default
  #3
New Member
 
Jingyao Wang
Join Date: Jun 2013
Posts: 29
Rep Power: 4
wjy-c is on a distinguished road
thank you for your reply. my friend recently told me that I could creat a rotating multiphase domain which contain the gear and regard the rotating gear as wall boundary. I figure conduct my simulation successfully as my friend's advice. consider the rotating frame of refernce as you mentioned, I do not quite understand what does the "reference" mean, do you mean the same solution as my friend said?
wjy-c is offline   Reply With Quote

Old   June 17, 2013, 08:11
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,941
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
You have to be very careful to use the correct words. Some of the features in CFX have similar names but are quite different. So be very careful to use the correct name for the CFX features you are talking about.

The rotating domains of reference model is mainly used for turbomachinery modelling, but is useful for just about anything else which rotates as well. It is valid with just about all the physics models so you can use complex multiphase models with it.

You might be able to do this with moving mesh but it will be much more complex and slower.

You might be able to do this with a rigid body solver but it will be much more complex.

I do not think you can do this with an immersed solid approach as it does not properly support multiphase.
ghorrocks is offline   Reply With Quote

Old   June 17, 2013, 11:33
Default
  #5
New Member
 
Jingyao Wang
Join Date: Jun 2013
Posts: 29
Rep Power: 4
wjy-c is on a distinguished road
It's very kind of you to offer me those advices. I understand what you mean. Really thank you.
wjy-c is offline   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
Two-sided Wall Heat Transfer BC - No Separate Solid Mesh and No Heat Transfer Coeff swahono OpenFOAM Running, Solving & CFD 8 February 26, 2015 05:30
SnappyHexMesh for internal Flow vishwa OpenFOAM Native Meshers: snappyHexMesh and Others 23 August 6, 2014 03:50
Update of the variables after dynamic mesh motion. gtg258f OpenFOAM Programming & Development 9 January 18, 2014 11:08
Flow over a flat plate as an immersed solid hamed.majeed CFX 3 May 28, 2013 22:41
Error finding variable "THERMX" sunilpatil CFX 8 April 26, 2013 07:00


All times are GMT -4. The time now is 00:58.