NACA 0012 Verification

isaac1326 · October 4, 2019, 12:30

I have used the mesh from https://turbmodels.larc.nasa.gov/naca0012_grids.html. I have used the command plot3dToFoam to convert the p2dfmt of 896X512 points to Foam Mesh. I am using SA method, I am getting negative Cd values. the min y+ value is 0.007.
Link to the Files: https://drive.google.com/file/d/1TO8...ew?usp=sharing

thiagopl · October 4, 2019, 14:14

Hi isaac1326,

I saw that you changed the velocity vector direction to simulate the angle of attack. Once you did that, you have also to change the direction of the vector in which the OF calculates de lift (liftDir) and drag (dragDir). By definition, the lift vector is perpendicular to the free stream velocity and the drag is parallel to the same vector.

Also, might try to reduce your residuals (and increase you endTime if you do so).

Regards,

klausb · October 15, 2020, 18:56

You could create the mesh yourself using: https://sourceforge.net/projects/construct2d/

To change the AOA (angle of attack) it's usually easier to rotate the mesh using OpenFOAMs rotateMesh

October 4, 2019, 12:30	NACA 0012 Verification	#1
isaac1326 New Member Isaac Join Date: Feb 2013 Posts: 27 Rep Power: 10	I have used the mesh from https://turbmodels.larc.nasa.gov/naca0012_grids.html. I have used the command plot3dToFoam to convert the p2dfmt of 896X512 points to Foam Mesh. I am using SA method, I am getting negative Cd values. the min y+ value is 0.007. Link to the Files: https://drive.google.com/file/d/1TO8...ew?usp=sharing

October 4, 2019, 14:14		#2
thiagopl Member Thiago Parente Lima Join Date: Sep 2011 Location: Diamantina, Brazil. Posts: 54 Rep Power: 12	Hi isaac1326, I saw that you changed the velocity vector direction to simulate the angle of attack. Once you did that, you have also to change the direction of the vector in which the OF calculates de lift (liftDir) and drag (dragDir). By definition, the lift vector is perpendicular to the free stream velocity and the drag is parallel to the same vector. Also, might try to reduce your residuals (and increase you endTime if you do so). Regards, __________________ Fields of interest: Heat transfer; Convection heat transfer; Conjugate heat transfer.

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October 15, 2020, 18:56		#3
klausb Senior Member Klaus Join Date: Mar 2009 Posts: 207 Rep Power: 19	You could create the mesh yourself using: https://sourceforge.net/projects/construct2d/ To change the AOA (angle of attack) it's usually easier to rotate the mesh using OpenFOAMs rotateMesh