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

Vortex induced Vibrations

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

Like Tree8Likes

Reply
 
LinkBack Thread Tools Display Modes
Old   July 28, 2014, 08:01
Default
  #21
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
Dear Araujo,

Do i need to input constraints for my body in dynamicMeshDict file?, because the same i had already inputed in pointDisplacement file.
Pls suggest.

Thanks and Regards,
Amit Dhage
Amit-1911 is offline   Reply With Quote

Old   July 28, 2014, 14:30
Default
  #22
New Member
 
Leonardo Antonio de Araujo
Join Date: Feb 2014
Location: Porto Alegre
Posts: 15
Rep Power: 3
araujo is on a distinguished road
Send a message via Skype™ to araujo
Quote:
Originally Posted by Amit-1911 View Post
Dear Araujo,

Do i need to input constraints for my body in dynamicMeshDict file?, because the same i had already inputed in pointDisplacement file.
Pls suggest.

Thanks and Regards,
Amit Dhage
Which openfoam version are you using? This varies from version to version.
araujo is offline   Reply With Quote

Old   July 28, 2014, 15:01
Default
  #23
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
I am using version 2.2.2
Amit-1911 is offline   Reply With Quote

Old   July 28, 2014, 15:50
Default
  #24
New Member
 
Leonardo Antonio de Araujo
Join Date: Feb 2014
Location: Porto Alegre
Posts: 15
Rep Power: 3
araujo is on a distinguished road
Send a message via Skype™ to araujo
Quote:
Originally Posted by Amit-1911 View Post
I am using version 2.2.2
Check out the pointDisplacement file. I believe there is something wrong with your constraints.
araujo is offline   Reply With Quote

Old   July 29, 2014, 00:50
Default
  #25
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
Dear Araujo,

I have checked the constraints many a times and really not finding any clue,
can you pls check the same file i am attaching herewith and suggest something.

Regards,
Amit Dhage
Attached Files
File Type: txt pointDisplacement.txt (2.5 KB, 22 views)
Amit-1911 is offline   Reply With Quote

Old   July 29, 2014, 05:35
Default
  #26
New Member
 
Leonardo Antonio de Araujo
Join Date: Feb 2014
Location: Porto Alegre
Posts: 15
Rep Power: 3
araujo is on a distinguished road
Send a message via Skype™ to araujo
Quote:
Originally Posted by Amit-1911 View Post
Dear Araujo,

I have checked the constraints many a times and really not finding any clue,
can you pls check the same file i am attaching herewith and suggest something.

Regards,
Amit Dhage
Center of mass on (0,0,0)? Is that correct? It is important to notice that the center of mass of the cylinder is referred relative to the domain position (your mesh).
araujo is offline   Reply With Quote

Old   July 29, 2014, 05:50
Default
  #27
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
Dear Araujo,

The centre of mass is specified w.r.t global coordinate system, and the domain is also specified w.r.t global coordinate system. Is this correct?

regards,
Amit Dhage
Amit-1911 is offline   Reply With Quote

Old   August 21, 2014, 07:48
Default
  #28
Senior Member
 
ok
Join Date: Oct 2013
Posts: 257
Rep Power: 4
Maimouna is on a distinguished road
Dear Amit,

my pointDisplacement file is attached. I hope that would be help.

All the best.
Maimouna is offline   Reply With Quote

Old   August 21, 2014, 07:50
Default
  #29
Senior Member
 
ok
Join Date: Oct 2013
Posts: 257
Rep Power: 4
Maimouna is on a distinguished road
Sorry there is attached problem. Here it is

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class pointVectorField;
location "0.01";
object pointDisplacement;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 0 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
cylinder
{
type calculated;
value uniform (0 0 0);
}

top
{
type empty; //symmetry;
}

bottom
{
type empty; //symmetry;
}

walls
{
type slip; //symmetry;
}


".*"
{
type fixedValue;
value uniform (0 0 0);
}
}


// ************************************************** *********************** //
Maimouna is offline   Reply With Quote

Old   August 21, 2014, 12:58
Default
  #30
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
Dear Maimouna,

Thanks for your reply!

Are you able to produce results with point displacement file you sent to me?, since you have not imposed any constraints on the body, if so then i will try with the same.

Thanks and regards,
Amit Dhage
Amit-1911 is offline   Reply With Quote

Old   August 22, 2014, 06:21
Default
  #31
Senior Member
 
ok
Join Date: Oct 2013
Posts: 257
Rep Power: 4
Maimouna is on a distinguished road
Dear Amit,

constraints and resistance are imposed in dynamicMeshDict file. I'm still working on that to get the result.

Regards
Maimouna
Maimouna is offline   Reply With Quote

Old   August 22, 2014, 06:33
Default
  #32
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
Dear Maimouna,

I am not sure if that will work, because if you go through the tutorial of Wing motion...constraints and restraints are set in PointDisplacement file and not in dynamicMeshDict file.

Thanks and regards,

Amit Dhage
Amit-1911 is offline   Reply With Quote

Old   August 22, 2014, 06:47
Default
  #33
Senior Member
 
ok
Join Date: Oct 2013
Posts: 257
Rep Power: 4
Maimouna is on a distinguished road
Dear Amit,

you are right if you are using OF-2.2.2, but I'm using OF-2.3.0. So you will find the difference.

All the best.
Maimouna
Maimouna is offline   Reply With Quote

Old   August 22, 2014, 07:10
Default
  #34
New Member
 
Amit Dhage
Join Date: Sep 2013
Location: India
Posts: 15
Rep Power: 3
Amit-1911 is on a distinguished road
oh is it?, then its fine...let me know if it works successfully.

Thanks and regards,
Amit Dhage
Amit-1911 is offline   Reply With Quote

Old   August 27, 2014, 07:07
Default
  #35
Senior Member
 
ok
Join Date: Oct 2013
Posts: 257
Rep Power: 4
Maimouna is on a distinguished road
Dear Leonardo,

what are your stiffness and damping values that you used in your case?

What about displacement? Where exactly did you set that?

Could you please provide us by that information to make more clarification.

Thanks and regards.

Maimouna
Maimouna is offline   Reply With Quote

Old   September 16, 2014, 03:24
Default
  #36
New Member
 
Alireza Heidari
Join Date: Apr 2014
Posts: 5
Rep Power: 3
alirezahd is on a distinguished road
Quote:
Originally Posted by Amit-1911 View Post
Dear Araujo,

I have checked the constraints many a times and really not finding any clue,
can you pls check the same file i am attaching herewith and suggest something.

Regards,
Amit Dhage
dear Amit
i have run with your pointDisplacement file and the result shown the cylinder is stationary in different Re number (Re=100,150,200)
did you have same problem? and what did you do?
Thanks & regards
Alireza Heidari
alirezahd is offline   Reply With Quote

Reply

Tags
6 dof, openfoam 2.1.0, pointdisplacement, tutorial, vortex induced vibrations

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
vortex induced vibration from dynamic mesh natto Main CFD Forum 4 April 18, 2015 19:42
vortex induced vibration Simon Wang FLUENT 3 June 17, 2012 05:22
"bit" phenomenon in Vortex Induced Vibration? JOEY Main CFD Forum 0 August 4, 2006 08:49
Vortex Induced vibration of subsea pipeline Mobasheri FLUENT 5 February 9, 2006 08:07
Flow induced vibrations Sujit Main CFD Forum 3 September 1, 2003 05:09


All times are GMT -4. The time now is 10:00.