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Forum: OpenFOAM

February 21, 2013, 19:15

Replies: 19

liftDrag

Views: 8,268

Posted By rflats

Please try setting the reference area as...

Please try setting the reference area as Aref=(airfoil chord length)*(length in the spanwise direction of your 2D domain). See the postings above for the explanation.

Cheers,
Ricardo

Forum: OpenFOAM

October 7, 2010, 08:32

Replies: 19

liftDrag

Views: 8,268

Posted By rflats

Hi Vesselin, This occurs because OpenFOAM is...

Hi Vesselin,
This occurs because OpenFOAM is not a "pure" 2D solver. In fact, it always uses 3D meshes, and the 2D simulation is made by a special treatment of the boundary conditions in the...

Forum: OpenFOAM

July 7, 2010, 11:01

Replies: 19

liftDrag

Views: 8,268

Posted By rflats

When calculating the drag coefficient, one has to...

When calculating the drag coefficient, one has to choose what are the geometrical parameters that make sense for each particular case. In the case of 3D bluff bodies (e.g. a passenger car, or a...

Forum: OpenFOAM

July 6, 2010, 08:56

Replies: 19

liftDrag

Views: 8,268

Posted By rflats

Answering your questions: 1. For a 2D...

Answering your questions:

1. For a 2D airfoil, you can simply put Aref=lRef=chord length.
In the case of a 2D cylinder, Aref=lRef=diameter

2. For 3D cases, you have to put reference...

Forum: OpenFOAM

July 6, 2010, 07:41

Replies: 19

liftDrag

Views: 8,268

Posted By rflats

Hi Jie, lRef and ARef are the reference length...

Hi Jie,
lRef and ARef are the reference length and area, respectively. This information is necessary for calculating the lift and drag coefficients.
If you are working with a 2D airfoil, you need...

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