|
[Sponsors] |
January 21, 2014, 22:46 |
Calculation of Cf in Openfoam
|
#1 |
New Member
rajesh
Join Date: Jun 2012
Location: Bangalore
Posts: 9
Rep Power: 13 |
Dear all,
I am doing simulation of flow past Selig airfoil.. I am wondering how to calculate co-efficient of friction?? if anybody knows. Pls respond. |
|
January 22, 2014, 12:05 |
|
#2 |
Member
Eric Robertson
Join Date: Jul 2012
Posts: 95
Rep Power: 14 |
||
January 23, 2014, 05:35 |
|
#3 |
New Member
rajesh
Join Date: Jun 2012
Location: Bangalore
Posts: 9
Rep Power: 13 |
Dear Eric
Thanks for your reply. I calculated resultant of the three components as V = sqrt(u_sq+v_sq+w_sq). Is this the way to calculate resultant of 3 components? By this i get only positive values. If there is separation in the flow, i should get negative Cf. |
|
January 23, 2014, 07:56 |
|
#4 |
Member
Eric Robertson
Join Date: Jul 2012
Posts: 95
Rep Power: 14 |
That is correct.
Since your flow has separation, there will be a local minimum value of Cf accompanied by an increase. I'm other words, your graph will approach zero Cf but will begin to diverge away from it. You must locate this value and manually place a negative sign next to the values in your region after separation. |
|
January 27, 2014, 04:09 |
|
#5 |
New Member
rajesh
Join Date: Jun 2012
Location: Bangalore
Posts: 9
Rep Power: 13 |
Dear Eric,
Thanks a lot |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Calculation of mass flow rate in OpenFOAM 2.0.1 | rawe666 | OpenFOAM Running, Solving & CFD | 15 | November 21, 2017 10:18 |
OpenFOAM 1.6.x, 1.7.0 and 1.7.x are not fully prepared to work with gcc-4.5.x | wyldckat | OpenFOAM Bugs | 18 | October 21, 2010 05:51 |
The calculation efficiency of OpenFOAM | chiven | OpenFOAM Running, Solving & CFD | 4 | September 14, 2009 04:44 |
Velocity spots in openFoam results | Valle | OpenFOAM Running, Solving & CFD | 4 | August 19, 2009 05:53 |
OpenFOAM Debian packaging current status problems and TODOs | oseen | OpenFOAM Installation | 9 | August 26, 2007 13:50 |