CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Visualization & Post-Processing Software > Tecplot

Calculate CF

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

Like Tree1Likes
  • 1 Post By duri

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 24, 2012, 11:00
Default Calculate CF using Tecplot
  #1
New Member
 
Andreas Piskopakis
Join Date: Jan 2011
Posts: 4
Rep Power: 15
Odusseas is on a distinguished road
Hi all

I am tring to calculate the cf in tecplot.

cf = 2*tau_wall/(density*free stream velosity**2)

Until now I have not found one way to calculate the τw(tau wall) in tecplot.

So I am thinking If it is possible to calculate Cf from the equations that i found in this site.

http://www.cfd-online.com/Wiki/Skin_...on_coefficient

Thank you for your time

Last edited by Odusseas; January 27, 2012 at 05:31.
Odusseas is offline   Reply With Quote

Old   January 24, 2012, 13:21
Default
  #2
Senior Member
 
duri
Join Date: May 2010
Posts: 245
Rep Power: 16
duri is on a distinguished road
I think for turbulent case you can estimate u+ from y+ based on the model you are using. Once u+ is available estimate u* which is sqrt(shear stress/density). In case of laminar flow you need to export gradient at wall to tecplot that directly gives shear stress.

The formula given in that link is for flat plate in case of other geometry you can refer to Fluid Dynamic Drag by Hoerner.
Odusseas likes this.
duri is offline   Reply With Quote

Old   January 26, 2012, 06:52
Default
  #3
New Member
 
Andreas Piskopakis
Join Date: Jan 2011
Posts: 4
Rep Power: 15
Odusseas is on a distinguished road
Hi Duri

Thank you for your answer

My final goals are to compute Cf,u+,y+

For Cf I have Cf = 2Tw/(rho*U_ref^2) where Tw = wall shear stress
Tw = mu*(dUp/dy) where Up = velocity parallel to the wall
So I need to compute Tw

For u+ I have u+ = Up/u* and u* = sqrt(Tw/rho)
So, I need also here the Tw

For y+ I have y+ = u*y/v
And I have the same problem here.

So For Cf,y+,u+ I need the Tw
I read the tecplot manuals but I didn't found samething relative to the Tw.
Do you know any other way to compute Tw from tecplot??
Can tecplot calculate this??

Thank you for your time
Kind Regards
Odusseas is offline   Reply With Quote

Old   August 28, 2020, 15:16
Default
  #4
New Member
 
Nihal Abdullah
Join Date: Aug 2020
Posts: 2
Rep Power: 0
nihalabdullah08 is on a distinguished road
Hi Odusseas,

May i know how did you calculate the Wall shear stress on tecplot?

Hope to hear a reply from you soon.

thanks
nihalabdullah08 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
how to calculate flow properties along the first grid point near to the wall kiran OpenFOAM Post-Processing 2 September 12, 2010 13:59
calculate values for eps and k from Re or u????? sbar OpenFOAM Pre-Processing 5 August 16, 2010 05:10
How to calculate Torque for francis turbine manish CFX 4 March 15, 2007 03:57
How to calculate energy dissipation chinthakindi Main CFD Forum 0 February 23, 2004 07:36
can use coupled solver to calculate combustion cfdfans FLUENT 0 November 25, 2003 05:48


All times are GMT -4. The time now is 01:06.