CFD of Wing on fixed Angle of Attack

samuelcarlo · August 2, 2013, 15:00

Hi guys I would like do make a CFD to evaluate the lift on a Wing of a little airplane ( the area of this wing is around 1 m^2). But I need to make the analyses on AOA =4.5 deg this is my problem!

I'm using CFX and I've Already created the enclosure around the Wing and the mesh too. I've used expressions on CFX to define AOA and the initial velocity (actually the velocity is a constant). And I've defined Ux e Uy the velocity o axis X and Y Ux = velocityXcos(AOA)
Uy =velocityXsin(AOA)

but every time that I put this program to run something wrong happened. and the simulations is stopped

someone have an idea? let me know it
Please I need help!!!

Far · August 2, 2013, 15:24

What type of error message you are getting?

samuelcarlo · August 2, 2013, 22:13

Quote:

Originally Posted by Far

What type of error message you are getting?

The ANSYS CFX solver exited with return code 1. No results file has been
created.

D.B · August 3, 2013, 00:11

I think something is wrong in the boundary conditions or initialization.

Far · August 3, 2013, 03:04

CFX gives you information on grid quality. Angle should be >18 and two more parameters.

1. check these quality metrics for mesh.

2. Check scaling of domain. In other words, if you have have made the geometry in mm, again you must have same units after importing mesh to CFX Pre.

3. Boundary conditions. Check them carefully. Especially while defining the angle of attack.

4. Are you using auto time scale?

samuelcarlo · August 3, 2013, 09:48

Quote:

Originally Posted by Far

CFX gives you information on grid quality. Angle should be >18 and two more parameters.

1. check these quality metrics for mesh.

2. Check scaling of domain. In other words, if you have have made the geometry in mm, again you must have same units after importing mesh to CFX Pre.

3. Boundary conditions. Check them carefully. Especially while defining the angle of attack.

4. Are you using auto time scale?

Yes I'm using auto time scale, I couldan't? Boundary conditions I´ve difined Inlet as u = Ux
V = Uy
W = 0
Outlet = 0 Pa
and the other surfaces including de surface of the wing as Wall.

samuelcarlo · August 3, 2013, 09:51

Another informations guys when I use just one velocity in Inlet boundary as 20m/s the simulations no problem!!!
Someone have a tutorial for me ?

ghorrocks · August 4, 2013, 07:09

CFX comes with tutorials, the ANSYS Customer page has more and CFX support has even more examples.

August 2, 2013, 15:00	CFD of Wing on fixed Angle of Attack	#1
samuelcarlo New Member SAMUEL CARLOS Join Date: Feb 2013 Posts: 5 Rep Power: 13	Hi guys I would like do make a CFD to evaluate the lift on a Wing of a little airplane ( the area of this wing is around 1 m^2). But I need to make the analyses on AOA =4.5 deg this is my problem! I'm using CFX and I've Already created the enclosure around the Wing and the mesh too. I've used expressions on CFX to define AOA and the initial velocity (actually the velocity is a constant). And I've defined Ux e Uy the velocity o axis X and Y Ux = velocityXcos(AOA) Uy =velocityXsin(AOA) but every time that I put this program to run something wrong happened. and the simulations is stopped someone have an idea? let me know it Please I need help!!!

August 3, 2013, 00:11		#4
D.B Member DB Join Date: Apr 2011 Posts: 87 Rep Power: 15	I think something is wrong in the boundary conditions or initialization. __________________ -D.B

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August 2, 2013, 15:24		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	What type of error message you are getting?

August 3, 2013, 03:04		#5
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	CFX gives you information on grid quality. Angle should be >18 and two more parameters. 1. check these quality metrics for mesh. 2. Check scaling of domain. In other words, if you have have made the geometry in mm, again you must have same units after importing mesh to CFX Pre. 3. Boundary conditions. Check them carefully. Especially while defining the angle of attack. 4. Are you using auto time scale?

August 3, 2013, 09:51		#7
samuelcarlo New Member SAMUEL CARLOS Join Date: Feb 2013 Posts: 5 Rep Power: 13	Another informations guys when I use just one velocity in Inlet boundary as 20m/s the simulations no problem!!! Someone have a tutorial for me ?

August 4, 2013, 07:09		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	CFX comes with tutorials, the ANSYS Customer page has more and CFX support has even more examples.