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-   -   NACA 0012 Different Angles of Attack (https://www.cfd-online.com/Forums/cfx/72184-naca-0012-different-angles-attack.html)

 Arvind January 28, 2010 00:54

NACA 0012 Different Angles of Attack

Hi All,

I want to perform flow simulations over NACA 0012 at different angles of attack. The method i followed is as below

X component of velocity, u = V cos(alpha)
Y component of velocity, v = V sin(alpha)

where alpha is the desired Angle of Attack.
I gave this conditions of velocities in the Inlet boundary condition which i have modelled as the left vertical plane .

Is this method correct??????

 Attesz January 28, 2010 08:43

Send a picture about your domain with the boundaries marked. What are the other boundary conditions "above" and "under" the airfoil?

 Arvind January 28, 2010 09:45

Hi Attila,

Here is the picture of my domain

I have given the velocity condition for inlet and pressure for both outlet and opening.

Inlet:

u = V cos(alpha)
v = V sin(alpha)
w = 0

Outlet & opening:

Static pressure: sea level

 Attesz January 28, 2010 09:48

I can't find the picture...

 Arvind January 28, 2010 09:52

Hey am very sorry it didnt attach it says it exceeds de memory.....am jus searching hw to reduce its size.......please don mind

 Arvind January 28, 2010 10:06

1 Attachment(s)
I hav attached a word file which contains de domain pis.....

 Attesz January 28, 2010 12:50

your settings are not so correct, you have better to use boundary conditions like in attached img.set the round inlet with velocity components, and the outlet to opening with static pressure, or set your inlet and opening boundaries to one opening with velocity, so you don't have to modify the geometry.

http://www.ara.bme.hu/%7Ecfd/FLUENTk...i/image002.jpg

good luck :)

Attesz

 Arvind January 29, 2010 00:55

Hi Attila,

Thnx a lot for ur help. I have never tried a boundary like u hav shown. I wil work on that and let u know if i find any difficulties.

 mct90 January 6, 2013 17:27

Quote:
 Originally Posted by Attesz (Post 244096) your settings are not so correct, you have better to use boundary conditions like in attached img.set the round inlet with velocity components, and the outlet to opening with static pressure, or set your inlet and opening boundaries to one opening with velocity, so you don't have to modify the geometry. http://www.ara.bme.hu/%7Ecfd/FLUENTk...i/image002.jpg good luck :) Attesz
Hi Attesz; can you upload the picture if you have it still, please?