CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Calculating Coefficients

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

LinkBack Thread Tools Search this Thread Display Modes
Old   May 30, 2001, 07:11
Default Calculating Coefficients
Posts: n/a

1- CFx5.4.1 give tangantial and normal componant of the force on the surface , which is declared wall.If the surface is not havining constant slope, how i can calaulate drag and lift forces.

2-Can we read the res. file ?

  Reply With Quote

Old   May 30, 2001, 23:58
Default Re: Calculating Coefficients
Steve Collie
Posts: n/a
By normal and tangential force components CFX means force due to pressure and force due to skin-friction. So if you sum these two vectors you will get the total force vector. You can then resolve this force into lift and drag forces using the angle of attack of the onset flow relative to the centerline of the wall. You will have to do these calculations yourself in a speadsheet as CFX doesn't have this facilities (I think!).
  Reply With Quote

Old   June 18, 2001, 23:59
Default Re: Calculating Coefficients
Robin Steed
Posts: n/a
Download a pre-release copy of CFX-Post from the CFX website ( CFX-Post is the new post processor for CFX-5, to be introduced with version 5.5 this fall. This new post processor has far more advanced post-processing capabilities than CFX-Visualize.

To get your total drag, take the area integral of the X component of pressure over your foil (assuming flow is in the X direction, correct otherwise . If your flow is not aligned with an axis, take the area integral in each direction and then take the dot product of the total force with the direction of flow.

  Reply With Quote


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
calculating n plotting moments coefficients maperik CFX 2 June 20, 2011 09:59
Computing aerodynamic coefficients on bidimensional sections in 3D problems Aragon FLUENT 0 July 22, 2009 04:07
Problems in calculating the fluid traction on the current structure frame in 3D models fw407 OpenFOAM Running, Solving & CFD 0 August 6, 2008 12:04
How to update polyPatchbs localPoints liu OpenFOAM Running, Solving & CFD 6 December 30, 2005 17:27
Density for calculating Force Coefficients ste_lakey CFX 2 September 19, 2005 04:35

All times are GMT -4. The time now is 08:41.