NACA 0012 Verification

isaac1326 · October 4, 2019, 11:30

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, 13:14

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, 17:56

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

HPE · December 12, 2021, 06:44

NACA0012 validation with OF v4 and OF v2006

October 4, 2019, 11:30	NACA 0012 Verification	#1
isaac1326 New Member Isaac Join Date: Feb 2013 Posts: 27 Rep Power: 13	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, 13:14		#2
thiagopl Member Thiago Parente Lima Join Date: Sep 2011 Location: Diamantina, Brazil. Posts: 62 Rep Power: 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, __________________ Fields of interest: buoyantFoam, chtMultRegionFoam.

December 12, 2021, 06:44		#4
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 932 Rep Power: 12	NACA0012 validation with OF v4 and OF v2006 __________________ The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror

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October 15, 2020, 17:56		#3
klausb Senior Member Klaus Join Date: Mar 2009 Posts: 250 Rep Power: 22	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