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na85
06-03-2009, 08:52 PM
Anyone used this yet? It's insane. Stephen Wolfram must friggin' bathe in patterns. He sees them everywhere.

Try this: wolframalpha.com, and search for "NACA 2213" (that's the spit XIV) or "NACA 23015.3" (the FW190)

Cool stuff if you're a chart monkey. I got the NACA numbers from: http://www.ae.uiuc.edu/m-selig/ads/aircraft.html

Alternatively you can look up all sorts of weird stuff and can be presented with more information than you wanted to know about many things.

Try, for instance:

"rule 110"

"population Paris Brussels"

"wingspan B-29 Superfortress / B-17 Flying Fortress"

EDIT: Lol... Brussels, not Belgium

na85
06-03-2009, 08:52 PM
Anyone used this yet? It's insane. Stephen Wolfram must friggin' bathe in patterns. He sees them everywhere.

Try this: wolframalpha.com, and search for "NACA 2213" (that's the spit XIV) or "NACA 23015.3" (the FW190)

Cool stuff if you're a chart monkey. I got the NACA numbers from: http://www.ae.uiuc.edu/m-selig/ads/aircraft.html

Alternatively you can look up all sorts of weird stuff and can be presented with more information than you wanted to know about many things.

Try, for instance:

"rule 110"

"population Paris Brussels"

"wingspan B-29 Superfortress / B-17 Flying Fortress"

EDIT: Lol... Brussels, not Belgium

Viper2005_
06-03-2009, 08:58 PM
Not really very useful since it's a purely inviscid incompressible potential flow result with no stall model (try putting in a crazy angle of attack and see what happens). Last time I checked, it also couldn't handle 6 digit NACA sections.

Javafoil is a much more useful tool:

http://www.mh-aerotools.de/airfoils/jf_applet.htm

Kettenhunde
06-03-2009, 09:53 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> Javafoil is a much more useful tool:
</div></BLOCKQUOTE>

Yes it is more useful however none of the 2D programs offer a useable stall model. They are not designed for that.

They are great tools if you understand their use and limitations.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> Because JavaFoil does not model laminar separation bubbles and flow separation, the results will be incorrect if either of these occur. Flow separation, as it occurs at stall, is modeled to some extent by empirical corrections, so that maximum lift can be predicted for "conventional" airfoils. </div></BLOCKQUOTE>

I just checked Wolfram Alpha:

http://www32.wolframalpha.com/input/?i=NACA+23015.3

It uses the same raw data as as Javafoil and I am willing to bet shares most of the same formulation. You just have to apply the corrections yourself in Wolfram Alpha although it does calculate critical mach although I question its accuracy. Your parameters are not adjustable either so it is of limited use it appears other than neato factor. It looks like its purpose is just to inform and not analyze.

The raw incompressible data leaves it opens to use different methods of applying first order compressibility effects.

Here is how Javafoil handles compressibility:

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> A standard compressibility correction according to Karman and Tsien has been implemented to take mild Mach number effects into account. As long as the flow stays subsonic (V below V* in the Velocity diagram), the results should be fairly accurate. Usually this means Mach numbers between zero and 0.5. You cannot analyze airfoils in supersonic flow with the methods in JavaFoil.
</div></BLOCKQUOTE>

http://www.mh-aerotools.de/airfoils/jf_about.htm

Thanks for sharing.

All the best,

Crumpp

na85
06-03-2009, 10:54 PM
Wolfram alpha is more than just an airfoil simulation

http://www27.wolframalpha.com/faqs.html

Kettenhunde
06-03-2009, 11:21 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> Wolfram alpha is more than just an airfoil simulation
</div></BLOCKQUOTE>

It looks like the birth of an Orwellian nightmare.

http://forums.ubi.com/images/smilies/16x16_smiley-tongue.gif

na85
06-04-2009, 01:06 AM
http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

Perhaps they will release the Wolfram Thought Police soon.