Half model question

[deenri...@gmail.com]

Hi, 

I am getting different values for CL/CD depending on if I use half or full model geometry. 

I setup a simple wing geometry. 

My procedure for running half model. I set the geometry to no symmetry (half model). But set the VLM solver to X-Z symmetry.  The Sref is for half wing. 

CL = 0.55, CDtot =  0.03

Next, I set the geometry to symmetry X-Z (full model), no symmetry in the solver. 

The Sref is for full wing. 

CL = 0.275, CDtot = 0.015

Now obviously, there is a factor of 2 delta between the two solutions. 

Is this intended behavior? or should the half model forces be decreased by 2?

- Daniel

[Rob McDonald]

I think when you tell VSPAERO to do a half model, it takes care of the *2 for you.

I.e. you should still tell VSPAERO the Sref of the entire configuration -- not the half configuration.

Rob

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