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Search took 0.00 seconds. Search: Posts Made By: ghorrocks
Forum: CFX April 23, 2016, 07:16
Replies: 22
Views: 15,059
Posted By ghorrocks
Assuming your foil is moving at a reasonable Re...

Assuming your foil is moving at a reasonable Re number (1e5 or higher), then your mesh is too coarse and you have no inflation layers. You will need inflation layer for good boundary layer resolution...
Forum: CFX April 20, 2016, 06:00
Replies: 22
Views: 15,059
Posted By ghorrocks
Your images are too small to be useful. Please...

Your images are too small to be useful. Please attach the full resolution images. Also:
* Describe what the images are showing
* Attach your output file.
Forum: CFX April 20, 2016, 03:34
Replies: 22
Views: 15,059
Posted By ghorrocks
So my previous post went on to say "Negative drag...

So my previous post went on to say "Negative drag means your simulation is inaccurate". So you need to do the normal checks and sensitivity analyses to get an accurate result.

Please post an...
Forum: CFX April 19, 2016, 18:33
Replies: 22
Views: 15,059
Posted By ghorrocks
A stalled wing should produce lots of drag. ...

A stalled wing should produce lots of drag.

Negative drag means your simulation is inaccurate. There is a small possibly you are doing a strange case when the really drag is negative, such as...
Forum: CFX January 30, 2014, 03:51
Replies: 22
Views: 15,059
Posted By ghorrocks
FAQ:...

FAQ: http://www.cfd-online.com/Wiki/Ansys_FAQ#Why_are_my_results_inaccurate.3F
Forum: CFX December 3, 2013, 17:31
Replies: 22
Views: 15,059
Posted By ghorrocks
Regardless of how you have meshed it it...

Regardless of how you have meshed it it integrates over the surface. The meshing will "just" determine the accuracy of the simulation, not the approach.
Forum: CFX December 3, 2013, 17:03
Replies: 22
Views: 15,059
Posted By ghorrocks
No, it is not using drag=0.5*rho*A*U^2 :) It...

No, it is not using drag=0.5*rho*A*U^2 :)

It is integrating the pressure and wall shear over the surface of the body.
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