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Forum: OpenFOAM Running, Solving & CFD

April 20, 2012, 07:32

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

In that case it might be even too small. I think...

In that case it might be even too small. I think y+ should be between 30 and 200 for simulations with wall functions.

However I am not sure if you have calculated y+ or y*. Using yPlusRAS seems to...

Forum: OpenFOAM Running, Solving & CFD

April 19, 2012, 09:16

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

Taking into consideration that you are working...

Taking into consideration that you are working with a wall function, your y+ is by no means too big. I would check y+ at the last time step but I guess it will be OK.
Greetings
Ivan

Forum: OpenFOAM Running, Solving & CFD

April 19, 2012, 04:55

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

Hi Qiang Wang, What I would do is to create a...

Hi Qiang Wang,
What I would do is to create a patch that corresponds exactly with your region of interest. You can do this e.g. dividing your stl in several parts before doing your mesh. If you mesh...

Forum: OpenFOAM Running, Solving & CFD

April 19, 2012, 04:30

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

Hi Joe, that seems to be a nice mesh. The...

Hi Joe,
that seems to be a nice mesh.
The first layer of cells in the boundary layer looks a bit too thick. Which is your y+?
And which is the angle of attack you have simulated?
By the way, as...

Forum: OpenFOAM Running, Solving & CFD

April 18, 2012, 06:58

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

You should do a patch for the specific section...

You should do a patch for the specific section you are interested in and then use the forces lib.
Greets
Ivan

Forum: OpenFOAM Running, Solving & CFD

April 17, 2012, 05:09

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

Try it again including this in your controlDict ...

Try it again including this in your controlDict
rhoName rhoInf;
rhoInf 1.225; //density of your fluid

Good luck
Ivan

Forum: OpenFOAM Running, Solving & CFD

April 5, 2012, 12:14

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

Hi Joe, Interesting, actually I am trying to do...

Hi Joe,
Interesting, actually I am trying to do exactly the same like you: dynamic stall studies on a pitching blade. My plan is also getting first decent results on a static case and then go for...

Forum: OpenFOAM Running, Solving & CFD

April 5, 2012, 10:43

Replies: 56

simpleFOAM NACA0012 (α=8°) cL, cD not matching published data

Views: 18,928

Posted By Ivanet

Hi JFerrari, are you doing the mesh with...

Hi JFerrari,
are you doing the mesh with blockMesh? You could use splines instead of straight edges when defining your blocks . This would allow you to have a better control on the orthogonality of...

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