CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Reduce diffusion error in a wavemaker case

Register Blogs Community New Posts Updated Threads Search

Like Tree2Likes
  • 1 Post By Tamas
  • 1 Post By Tamas

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 1, 2020, 16:47
Question Reduce diffusion error in a wavemaker case
  #1
Member
 
Grivalszki Péter
Join Date: Mar 2019
Location: Budapest, Hungary
Posts: 39
Rep Power: 7
GrivalszkiP is on a distinguished road
Hi Foamers,

I have a flap wavemaker simulation.

From the results I can see that waves are smearing very fast, what differs from laboratory experimentents. How can I reduce this numerical diffusion error?
GrivalszkiP is offline   Reply With Quote

Old   December 3, 2020, 13:50
Default
  #2
New Member
 
Tamas's Avatar
 
Tamas Egeresi
Join Date: Nov 2014
Location: Budapest, Hungary
Posts: 14
Rep Power: 12
Tamas is on a distinguished road
Hi Péter,


Try to use dynamic mesh refinement, or just play around the fvSchemes by setting less diffusive schemes.
GrivalszkiP likes this.
__________________
Tamas Egeresi
Senior Hydraulics Engineer

CFD Egeresi
www.cfdegeresi.freecluster.eu
Tamas is offline   Reply With Quote

Old   December 3, 2020, 17:31
Default
  #3
Member
 
Grivalszki Péter
Join Date: Mar 2019
Location: Budapest, Hungary
Posts: 39
Rep Power: 7
GrivalszkiP is on a distinguished road
Thank you for your reply!


Quote:
Originally Posted by Tamas View Post
Try to use dynamic mesh refinement
I thought about it and I tried, but I could not solve it. I use the esi version of OF, I use the DynamicMeshDict to define motion or refinement. I tried to figure it out, but I could not solve to define both in one case. Do you have a solution for this? (OF v2006)

Quote:
Originally Posted by Tamas View Post
play around the fvSchemes by setting less diffusive schemes.
I also tried, mostly with vanLeer and linear schemes, "Gauss interfaceCompression vanLeer" for div(phi,alpha) but no success. Any hint?

Anyway, I use k-Omega SST turbulence model with buoyancy correction by Larsen and Devolder (multiphaseStabilizedTurbulence)...
GrivalszkiP is offline   Reply With Quote

Old   December 4, 2020, 03:06
Default
  #4
New Member
 
Tamas's Avatar
 
Tamas Egeresi
Join Date: Nov 2014
Location: Budapest, Hungary
Posts: 14
Rep Power: 12
Tamas is on a distinguished road
Hi!


Can you, please, upload a simple case to let me play with the setup?
GrivalszkiP likes this.
__________________
Tamas Egeresi
Senior Hydraulics Engineer

CFD Egeresi
www.cfdegeresi.freecluster.eu
Tamas is offline   Reply With Quote

Old   December 4, 2020, 05:02
Default
  #5
Member
 
Grivalszki Péter
Join Date: Mar 2019
Location: Budapest, Hungary
Posts: 39
Rep Power: 7
GrivalszkiP is on a distinguished road
Thank you, I'll send it with weTransfer link in e-mail through your website
GrivalszkiP is offline   Reply With Quote

Reply

Tags
diffusion error, flume, numerical diffusion, smearing, wavemaker


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
Free surface boudary conditions with SOLA-VOF Fan Main CFD Forum 10 September 9, 2006 13:24
Turbulent Flat Plate Validation Case Jonas Larsson Main CFD Forum 0 April 2, 2004 11:25
Pure diffusion Case prasat FLUENT 1 September 15, 2003 01:12
Body force - Does it work? Jan Rusĺs CFX 5 August 27, 2002 10:50
Numerical diffusion error Z.Zeng Main CFD Forum 8 October 22, 1999 10:06


All times are GMT -4. The time now is 15:41.