CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   Validation of Pitch moment for subsonic Delta wing (http://www.cfd-online.com/Forums/main/8820-validation-pitch-moment-subsonic-delta-wing.html)

Riaan March 9, 2005 16:13

Validation of Pitch moment for subsonic Delta wing
 
Hi everyone,

I am currently studying the Pitching moment of a 70deg delta wing at low alpha (<15) and low Mach numbers (M < 0.15).

From literature, my Cl and Cd values predict relatively close (10%) to experimental values - but my Cm data (pitching moment) is far out.

I understand that the pressure distribution on the leeward side of the delta wing is going to have a large impact on the Cm value - so if your vortex spanwise location is off - your Cm value will be off as well.

Has anyone working in this field - or could point me in the correct direction or suggest sources for experimental data?

Thanks Riaan

Jarmo Monttinen March 9, 2005 16:28

Re: Validation of Pitch moment for subsonic Delta
 
I'm not working on this and don't know of experimental data, but these suggestions came to my mind as alternates:

About which location are you calculating you Cm, and which location does the experiment use? This might be the source of the problem... if not, then look at the Cp-distribution if possible.

-- Jarmo

Riaan March 9, 2005 16:36

Re: Validation of Pitch moment for subsonic Delta
 
I took the same position and same non-dimensionalizing value of length...first thing I checked !


All times are GMT -4. The time now is 22:05.