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

vorticity resolution in paraFoam

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

Like Tree1Likes
  • 1 Post By Tobi

Reply
 
LinkBack Thread Tools Display Modes
Old   September 4, 2012, 18:35
Default vorticity resolution in paraFoam
  #1
Member
 
Elh. A2. BAH
Join Date: Jan 2012
Posts: 64
Rep Power: 5
ebah6 is on a distinguished road
Dear all,

I am using the "Filters/calcualteDerivatives" option to visualise the vorticity magnitude. But the resolution is quite not good.
Attached are two snapshots of the velocity magnitude and the vorticity magnitude.
Can someone direct me on how to get a resolution of the vorticity similar to that of the velocity?

Please, note that in the down-scroll bar, the velocity can be show with a bad resolution as well. But the vorticity has the bad one only.

best regards.
Attached Images
File Type: jpg velocityMag.jpg (40.0 KB, 123 views)
File Type: jpg vorticityMag.jpg (41.3 KB, 109 views)
ebah6 is offline   Reply With Quote

Old   September 6, 2012, 10:05
Default
  #2
Senior Member
 
Tobi's Avatar
 
Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 1,077
Blog Entries: 4
Rep Power: 19
Tobi will become famous soon enough
Send a message via ICQ to Tobi Send a message via Skype™ to Tobi
Quote:
Originally Posted by ebah6 View Post
Dear all,

I am using the "Filters/calcualteDerivatives" option to visualise the vorticity magnitude. But the resolution is quite not good.
Attached are two snapshots of the velocity magnitude and the vorticity magnitude.
Can someone direct me on how to get a resolution of the vorticity similar to that of the velocity?

Please, note that in the down-scroll bar, the velocity can be show with a bad resolution as well. But the vorticity has the bad one only.

best regards.
Hi ebah,

do you mean sth like that (attachment)?
I used icoFoam and the post-utility "vorticity"; there you get the interpolation solution.

Hope it helps you.

Tobi
Attached Images
File Type: jpg vorticity1.jpg (22.1 KB, 84 views)
File Type: jpg vorticity2.jpg (19.5 KB, 83 views)
amir.a.aliabadi likes this.
Tobi is offline   Reply With Quote

Old   September 6, 2012, 13:32
Default
  #3
Member
 
Elh. A2. BAH
Join Date: Jan 2012
Posts: 64
Rep Power: 5
ebah6 is on a distinguished road
Thank you Tobias,

This is what I need.
Can tell how you obtain it.
Say I have run my case and have the velocity field; how can continue from there?
Or should I re-start the run and compute the vorticity in the same manner as the pressure and velocity fields?

Thank you for time.
ebah6 is offline   Reply With Quote

Old   September 6, 2012, 16:31
Default
  #4
Senior Member
 
Tobi's Avatar
 
Tobias Holzmann
Join Date: Oct 2010
Location: Leoben (Austria)
Posts: 1,077
Blog Entries: 4
Rep Power: 19
Tobi will become famous soon enough
Send a message via ICQ to Tobi Send a message via Skype™ to Tobi
Quote:
Originally Posted by ebah6 View Post
Thank you Tobias,

This is what I need.
Can tell how you obtain it.
Say I have run my case and have the velocity field; how can continue from there?
Or should I re-start the run and compute the vorticity in the same manner as the pressure and velocity fields?

Thank you for time.
Hi,

you just have to type

Code:
vorticity
after your simulation in your case directory.
After that the utility calculates the vorticity from the velocity field.

Tobi
Tobi is offline   Reply With Quote

Old   September 6, 2012, 17:05
Default
  #5
Member
 
Elh. A2. BAH
Join Date: Jan 2012
Posts: 64
Rep Power: 5
ebah6 is on a distinguished road
Thank you very much.
This works perfect.

my best regards.
ebah6 is offline   Reply With Quote

Old   February 26, 2014, 11:01
Default Doesn't show vorticty?
  #6
Member
 
Olie
Join Date: Oct 2013
Posts: 40
Rep Power: 3
odellar is on a distinguished road
Hi,

I've used the vorticity, and ptot utilities after solving for my case, and it computes the vorticity and ptot fields (I can tell it's worked because the data is there in the folders 0, 0.1, etc) but when I open the case in ParaFoam it still only gives me options to display U, Umag, and p, not vorticity or ptot -- how do I get this?

Thanks
Olie
odellar is offline   Reply With Quote

Old   February 26, 2014, 11:04
Default Fixed!
  #7
Member
 
Olie
Join Date: Oct 2013
Posts: 40
Rep Power: 3
odellar is on a distinguished road
Quote:
Originally Posted by odellar View Post
Hi,

I've used the vorticity, and ptot utilities after solving for my case, and it computes the vorticity and ptot fields (I can tell it's worked because the data is there in the folders 0, 0.1, etc) but when I open the case in ParaFoam it still only gives me options to display U, Umag, and p, not vorticity or ptot -- how do I get this?

Thanks
Olie

Sorry forget this - just found it!
odellar is offline   Reply With Quote

Old   November 19, 2014, 10:27
Default
  #8
New Member
 
Soham Harshe
Join Date: May 2013
Posts: 2
Rep Power: 0
Soham Harshe is on a distinguished road
Quote:
Originally Posted by odellar View Post
Sorry forget this - just found it!
I am having the same problem. Can you please tell how to fix this ?
Soham Harshe is offline   Reply With Quote

Old   June 15, 2015, 12:30
Default
  #9
New Member
 
Rui Wang
Join Date: Apr 2015
Posts: 4
Rep Power: 2
wanrui is on a distinguished road
Quote:
Originally Posted by odellar View Post
Sorry forget this - just found it!
Sorry, how did you find the ptot data? I have the same problem in finding it in the paraFoam
wanrui 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
vorticity boundary condition bearcharge Main CFD Forum 0 May 14, 2010 11:32
vorticity calculation at symmetryplane benconnell OpenFOAM 0 April 14, 2009 18:45
Vorticity Iso-Surface John Main CFD Forum 0 April 4, 2009 23:10
ParaFoam OF 14 decomposed cases philippose OpenFOAM Paraview & paraFoam 4 April 18, 2007 05:17
Large difference in grid resolution for diff paper Ben Main CFD Forum 16 April 7, 2007 11:45


All times are GMT -4. The time now is 20:48.