|
[Sponsors] |
April 23, 2012, 15:17 |
Drag Coefficient
|
#1 |
Member
Join Date: Oct 2011
Location: OH, USA
Posts: 77
Rep Power: 14 |
Im trying to find the drag coefficient for NACA0012
Although I have a really fine mesh, it doesnt converge and at best it gives me 50% off the experimental data why is it like this? |
|
April 23, 2012, 22:58 |
|
#2 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,681
Rep Power: 66 |
Quote:
If the solution had converged then I would have said, for Drag Coefficient What is 50% off? Is it the drag coefficient? Did you remember to set your reference values? You need to specify the reference density and velocity for the dragon coefficient. For force vector you also need to input the reference vector. Other coefficients use other reference values also. |
||
April 24, 2012, 13:01 |
|
#3 |
Member
Join Date: Oct 2011
Location: OH, USA
Posts: 77
Rep Power: 14 |
although my mesh is fine (starts from 1e-06 normal to the airfoil surface) I dont reach convergence
what is wrong with it? |
|
April 24, 2012, 16:45 |
|
#4 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,681
Rep Power: 66 |
||
April 24, 2012, 21:21 |
|
#5 |
Member
Join Date: Oct 2011
Location: OH, USA
Posts: 77
Rep Power: 14 |
1e0-6 is the distance of first layer from the airfoil
the chord is 1 meter Im using C-mesh Im trying to use SA or SST-KW for turbulence model but i cant get convergence give me email so i cant send u "tin" file |
|
April 24, 2012, 21:53 |
|
#6 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,681
Rep Power: 66 |
||
April 24, 2012, 21:58 |
|
#7 |
Member
Join Date: Oct 2011
Location: OH, USA
Posts: 77
Rep Power: 14 |
1e-06 meter
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Drag Coefficient Convergence Problem | John | FLUENT | 18 | June 24, 2023 09:22 |
problem with saving drag coefficient | colopolo | FLUENT | 5 | April 12, 2013 10:59 |
Incorrect Drag and Drag Coefficient for flow over a cylinder | ozzythewise | Main CFD Forum | 8 | June 13, 2012 06:24 |
Drag coefficient for parcels in dieselFoam | sebastian_vogl | OpenFOAM Running, Solving & CFD | 5 | December 31, 2008 12:19 |
Automotive test case | vinz | OpenFOAM Running, Solving & CFD | 98 | October 27, 2008 08:43 |