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

On the harmonic interpolation scheme for the diffusivity coefficient

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 16, 2010, 10:35
Default On the harmonic interpolation scheme for the diffusivity coefficient
  #1
Senior Member
 
Vesselin Krastev
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 361
Rep Power: 10
vkrastev is on a distinguished road
Hi all,
browsing the forum recently I've found in an old post that in our beloved code (OpenFOAM) there is the possibility to use the harmonic interpolation scheme (rather than the classical linear scheme) for the evaluation of the diffusivity coefficient on the cell faces. Well, knowing from Patankar's book that when there could be abrupt changes in the diffusivity coefficient the harmonic interpolation scheme behaves much better than the linear one, I started to think about two questions: 1) why the harmonic option for the laplacian schemes is so rarely cited in this forum? 2) if any of you has some experience about it, does this choice give any significant improvements in turbulent flows calculations (where, in principle, the effective diffusivity coefficients should have significant changes from a point to the neighbour ones)? And if so, does it give any stability issues?
Every opinion/contribution about this matter would be really appreciated.

Thank you in advance

V.
vkrastev is offline   Reply With Quote

Old   December 18, 2010, 10:50
Default
  #2
Senior Member
 
Vesselin Krastev
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 361
Rep Power: 10
vkrastev is on a distinguished road
Mmmmh...so it seems like I'm the only one who has read this passage of Patankar's CFD book?
vkrastev is offline   Reply With Quote

Old   April 11, 2011, 08:38
Default
  #3
Senior Member
 
Kathrin Kissling
Join Date: Mar 2009
Location: Besigheim, Germany
Posts: 134
Rep Power: 8
kathrin_kissling is on a distinguished road
Hi Vesselin,

did you have any more information about this topic?
Did you get this to run?

I'm thinking about using the harmonic scheme as well.

Best

kathrin
kathrin_kissling is offline   Reply With Quote

Old   April 11, 2011, 08:52
Default
  #4
Senior Member
 
Ben K
Join Date: Feb 2010
Location: Ottawa, Canada
Posts: 140
Rep Power: 10
benk is on a distinguished road
I use harmonic interpolation mostly because I have sharp changes in the transport coefficient between regions in my model. In my model I was having big problems before I thought of using the harmonic scheme: I made some comparisons here (and in some posts above this one): Integrated conjugate heat transfer solver in OpenFOAM

I think most people don't use harmonic interpolation because they don't have sharp changes in the transport coefficient. The best thing to do is to try it to see if it changes your solution.
benk is offline   Reply With Quote

Old   April 11, 2011, 09:02
Default
  #5
Senior Member
 
Kathrin Kissling
Join Date: Mar 2009
Location: Besigheim, Germany
Posts: 134
Rep Power: 8
kathrin_kissling is on a distinguished road
Hi ben!

Thank you for your reply!
I will definitly give it a try!

Kathrin
kathrin_kissling is offline   Reply With Quote

Old   April 11, 2011, 09:13
Default
  #6
Senior Member
 
Vesselin Krastev
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 361
Rep Power: 10
vkrastev is on a distinguished road
Hi Kathrin, I think that Ben's answer can be considered quite exhaustive. This kind of interpolation was indeed introduced in finite volume calculation to account for very sharp changes in the diffusive transport coefficient (think about heat conduction through anisotropic or in general composite materials). Concerning CFD, I can tell you that for High-Re incompressible turbulent flows (RANS/URANS modeling, without heat transfer) I've found no benefits in using harmonic interpolation instead of the linear one (in addition the harmonic scheme seems to be slightly more unstable). Of course, things may be different when heat transfer is involved, so you have definitely to try it for your case!

Regards

V.
vkrastev 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
fvc::interpolate -> harmonic interpolation? gwierink OpenFOAM Running, Solving & CFD 8 October 1, 2012 13:31
solution diverges when linear upwind interpolation scheme is used subash OpenFOAM 0 May 29, 2010 01:23
vanLeer Interpolation Scheme with interFoam rassilon OpenFOAM Running, Solving & CFD 0 April 8, 2010 02:51
Automotive test case vinz OpenFOAM Running, Solving & CFD 98 October 27, 2008 09:43
CAVITATION (pressure interpolation scheme)!? ROOZBEH FLUENT 0 March 3, 2004 04:26


All times are GMT -4. The time now is 09:24.