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

data extraction of boundary layer thickness over a flat plate

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 9, 2013, 12:02
Default data extraction of boundary layer thickness over a flat plate
  #1
New Member
 
Karthik Goli
Join Date: Nov 2013
Posts: 7
Rep Power: 3
kick is on a distinguished road
Hi

I would like to validate my results of flow over a flat plate with blasius solution.
I run the case in simplefoam and i could see my results in parafoam.
However i would like to compare the boundary layer thickness with blasius solution along the flat plate, but unsuccessful in extracting the data from the results i got.

I am trying to extract the data from parafoam is that possible, i also tried using sampledict file but it shows nothing.

How can i extract the data from the results i got.

Please help me with your suggestions.

Thank You
Karthik Goli
kick is offline   Reply With Quote

Old   December 9, 2013, 16:55
Default
  #2
New Member
 
Schuyler Hinman
Join Date: Apr 2013
Location: Calgary, Alberta, Canada
Posts: 10
Rep Power: 4
schuyler is on a distinguished road
A very simple way (maybe not the most efficient) could be to use the plot on line function in paraview. Plot on a line extending perpendicular from the plate and up into the free stream. Then since the boundary layer thickness is at 99% of the free-stream velocity, you should be able to find this point easily. Then do this at several points depending how much resolution you want along the plate. I think this should work. You'll have to try it yourself.

S.
schuyler is offline   Reply With Quote

Old   December 9, 2013, 23:24
Default
  #3
New Member
 
Karthik Goli
Join Date: Nov 2013
Posts: 7
Rep Power: 3
kick is on a distinguished road
thank you very much for your reply schuyler

Is their any way that i can find the velocity at each and every node above the flat plate, and find out the boundary layer at every point on the flat plate and there by

i want to plot delta vs x1 graph

where delta is the boundary layer thickness and x1 is the length of the plate and compare my solution with blasius solution del=(5*x)/(sqrt(Re))

cheers
kick
kick is offline   Reply With Quote

Old   December 12, 2013, 17:22
Default
  #4
New Member
 
Schuyler Hinman
Join Date: Apr 2013
Location: Calgary, Alberta, Canada
Posts: 10
Rep Power: 4
schuyler is on a distinguished road
If you want to do it the way I said above with paraview you will probably just have to repeat the process over and over at each point along the plate. You could also export the data to Matlab and try to write a code to do it.

Another idea too (maybe not as helpful), if all you want to do is compare to blasius solution you could also compare the shear stress using the wallshearstress utility and compare it to the blasius solution for shear stress.

Schuyler
schuyler is offline   Reply With Quote

Old   December 14, 2013, 16:45
Default
  #5
New Member
 
Karthik Goli
Join Date: Nov 2013
Posts: 7
Rep Power: 3
kick is on a distinguished road
Hi schuyler

Thank you very much for help you have given me doing this project.

I tried using different functions of paraview but ended up doing it over a line.
I compared the displacement thickness (del) vs length along the flat plate and also coefficient of friction along the flat plate.

kick
kick 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
Turbulent Boundary Layer on a Flat Plate Hoshang Garda FLUENT 1 November 27, 2013 11:24
Flat plate and Boundary conditions Ravenn FLUENT 1 March 10, 2013 19:39
Setup of flat plate problem for laminar layer pankos Main CFD Forum 3 August 9, 2011 17:37
zero equation model for flat plate boundary layer Amir Main CFD Forum 4 June 18, 2008 11:16
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55


All times are GMT -4. The time now is 08:33.