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

Vof waves in star ccm+

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 23, 2013, 16:30
Default Vof waves in star ccm+
  #1
Member
 
David
Join Date: Nov 2011
Posts: 39
Rep Power: 5
dai549592484 is on a distinguished road
Hi all

Since the generation of wave is build in star ccm+ and for some reason, it is not that easy to monitor the wave elevation time history at some certain point in the wave field. Thus there's few investigation into the wave generating ability of star ccm+( I mean by using the build in vof wave method).

Recently, I've carried out some simulation about numerical wave tank using star ccm+ and found that wave generated using first order wave is not good( the time history of the wave elevation at certain point is not stable compared with the result gain by FLUENT). Is there anyone else who has experienced such problem?
dai549592484 is offline   Reply With Quote

Old   October 25, 2013, 11:10
Default
  #2
Member
 
Ryan Coe
Join Date: Jun 2010
Location: Albuquerque, NM
Posts: 98
Rep Power: 7
ryancoe is on a distinguished road
Could this be because 1st-order waves are physically unrealistic and therefore not supported by the governing equations being enforced in the simulation (this doesn't explain why Fluent would give better result)?
__________________
Ryan
ryancoe is offline   Reply With Quote

Old   October 25, 2013, 11:20
Default
  #3
Member
 
David
Join Date: Nov 2011
Posts: 39
Rep Power: 5
dai549592484 is on a distinguished road
Hi Ryan

In my view, it is ture that linear wave are physically unrealistic and for those CFD solve the problem based on N-S equation, it is not possible to generate exact first order linear wave, thus the result calculated by FLUENT is some more like 2nd order wave. However, it should not make the result unstable, I mean there should not be too much difference between each wave trough or crest.
dai549592484 is offline   Reply With Quote

Old   October 30, 2013, 09:30
Default
  #4
Member
 
Ryan Coe
Join Date: Jun 2010
Location: Albuquerque, NM
Posts: 98
Rep Power: 7
ryancoe is on a distinguished road
I suppose that the most likely culprit for a changing waveform at a set location would be reflections.
__________________
Ryan
ryancoe 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
problem when imported geometry from 3D CAD to star ccm, TAREK GANAT STAR-CCM+ 1 May 21, 2013 22:15
Using starToFoam clo OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 33 September 26, 2012 04:04
StarToFoam error Kart OpenFOAM Meshing & Mesh Conversion 1 February 4, 2010 05:38
error in star ccm maurizio CD-adapco 3 October 16, 2007 05:17
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15


All times are GMT -4. The time now is 07:18.