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

[waves2Foam] bichromaticFirst

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 28, 2014, 14:14
Default bichromaticFirst
  #1
New Member
 
Paulo Roberto
Join Date: Apr 2013
Posts: 6
Rep Power: 8
p.roberto is on a distinguished road
Hi,

I've tried to simulate first order bi-chromatic waves train in a 3D tank with 38.75m and variable depth, but in the results, the wave is losing height, the bichromatic wave should have at least H=0.1m but only have H=0.08m.

This is a study case to validate waves2foam for bi-chromatic waves, the results were compared with experimental data in same conditions.

In this graph you can see the results for the significant wave height along the channel for the both experimental (blue points) and numerical (red points) cases:

Capturar.PNG


The wave proprieties are:
T1=1.5s;
T2=1.1s;
H1=0.05m;
H2=0.05m;
depht in the generation zone=1.15m;

The mesh was generated using a mesh generation program and has acquired good results for stokes first waves with T=1.5s and H=0.08m.

Best regards,
P.Roberto
p.roberto is offline   Reply With Quote

Old   October 28, 2014, 15:54
Default
  #2
ngj
Senior Member
 
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Deltares, Delft, The Netherlands
Posts: 1,852
Rep Power: 32
ngj will become famous soon enoughngj will become famous soon enough
Hallo Pablo,

Specifying two waves of 5 cm will give you +/5 cm of surface elevation, so the significant wave height should be smaller then 10 cm. So, how did you obtain so large values in the laboratory?

Kind regards,

Niels
__________________
Please note that I do not use the Friend-feature, so do not be offended, if I do not accept a request.
ngj is offline   Reply With Quote

Old   October 29, 2014, 19:08
Default bichromaticFirst
  #3
New Member
 
Paulo Roberto
Join Date: Apr 2013
Posts: 6
Rep Power: 8
p.roberto is on a distinguished road
Quote:
Originally Posted by ngj View Post
Hallo Pablo,

Specifying two waves of 5 cm will give you +/5 cm of surface elevation, so the significant wave height should be smaller then 10 cm. So, how did you obtain so large values in the laboratory?

Kind regards,

Niels
Hi Niels, thank you for reply

I forgot to refer that the tank geometry has a width reduction to increase the wave heigtht and improve the hydraulic behavior. You can see the tank geometry in this figure:

tank.PNG

As i've said the mesh has acquired good results for stokes first waves with T=1.5s and H=0.08m so i don't think the problem is on the mesh.

Best regards!
p.roberto is offline   Reply With Quote

Old   October 30, 2014, 14:29
Default
  #4
ngj
Senior Member
 
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Deltares, Delft, The Netherlands
Posts: 1,852
Rep Power: 32
ngj will become famous soon enoughngj will become famous soon enough
Good evening,

@Paulo: That a long wave (1.5 s) propagates correctly does not mean that a shorter wave (1.1 s) will on the same discretisation.

Kind regards,

Niels
__________________
Please note that I do not use the Friend-feature, so do not be offended, if I do not accept a request.

Last edited by wyldckat; October 8, 2018 at 10:52. Reason: removed answer to another post that was on the main thread
ngj 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
[waves2Foam] bichromaticFirst haukewww OpenFOAM Community Contributions 0 June 15, 2016 12:29


All times are GMT -4. The time now is 10:06.