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

Flow modeling in 2D geometry as helical coil.

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 6, 2021, 20:25
Default Flow modeling in 2D geometry as helical coil.
  #1
Member
 
Ash Kotwal
Join Date: Jul 2016
Location: North Dakota, USA
Posts: 67
Rep Power: 6
Ash Kot is on a distinguished road
Hello Sir/Ma'am,

I'm trying to setup helical coil heat exchanger using 2D geometry. Now if one takes cross-section of 3D helical coil, then the person should see bunch of circles aligned next to each other in form of array. Sure, its not possible to setup helical flow in this 2D section because all 3 dimensions play critical role. The flow moves X,Y,Z directions.

Now, correct me if I'm wrong but if I put the periodic boundary conditions for each of these circles and periodicity setup only for velocity variable, will it work?
The attached geometry shall provide 'some-what' idea that I'm talking about
Attached Images
File Type: jpg The2DModelingofHelixCoil.jpg (60.7 KB, 6 views)
Ash Kot is offline   Reply With Quote

Old   January 7, 2021, 10:32
Default
  #2
Senior Member
 
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,259
Rep Power: 20
Gert-Jan will become famous soon enough
Maybe the approach as described in the PhD thesis of Jasper Kelder from The Eindhoven University of Technology might help:



https://research.tue.nl/en/publicati...al-sterilisers
Gert-Jan is offline   Reply With Quote

Old   January 7, 2021, 13:16
Default
  #3
Senior Member
 
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,003
Rep Power: 19
evcelica is on a distinguished road
I would not recommend proceeding in that 2D way.
Even if it ends up "working", it will take a ton of time and effort to set up and get it to solve, plus the physics will be wrong for multiple reasons
I would definitely just Model this in 3D.
evcelica is offline   Reply With Quote

Old   January 7, 2021, 15:43
Default
  #4
Member
 
Ash Kotwal
Join Date: Jul 2016
Location: North Dakota, USA
Posts: 67
Rep Power: 6
Ash Kot is on a distinguished road
Quote:
Originally Posted by Gert-Jan View Post
Maybe the approach as described in the PhD thesis of Jasper Kelder from The Eindhoven University of Technology might help:



https://research.tue.nl/en/publicati...al-sterilisers
The whole Thesis is just 3D approach of Geometry, so the document didn't help me at all other than getting information of Food industry CFD stuff.
Ash Kot is offline   Reply With Quote

Old   January 7, 2021, 16:10
Default
  #5
Senior Member
 
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,259
Rep Power: 20
Gert-Jan will become famous soon enough
Indeed, this thesis is all about 3D modelling, but it shows a nice simplification of a helical tube to a straight tube, which is easier to model. So if you want to model what is happening inside the tubes, this could be a valuable approach, even with a small computer, which I suspect you have, since you try to simplify things in a way that is useless as Evelica already mentioned.

Treating a heat exchanger with a helical tube in the way you want to, would not lead to meaning full results since you ignore the dean vortices that help the heat transfer.


If you are interested in what is happening outside the helical coil. then simply ignore these and model them as wall with a Neumann-Dirichlet boundary condition with temperature at infinitiy and a heat transfer coefficient.
Gert-Jan 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
Simulate particle/liquid flow in a converging geometry with MPPICFoam minzhang OpenFOAM Running, Solving & CFD 4 August 2, 2019 18:35
actual flow rate not match the designed flow rate in ventilation modeling minecraftgp OpenFOAM Running, Solving & CFD 2 November 18, 2018 13:37
Modeling the gas flow through the packed bed of DEM particles Legat STAR-CCM+ 3 October 18, 2018 10:41
Initialize flow from different geometry B.Axel FLUENT 2 January 24, 2018 14:15
Problem with Periodic Boundary for helical coil nilhas FLUENT 0 January 2, 2013 02:26


All times are GMT -4. The time now is 04:20.