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# Coefficient of Drag - 2D versus 3D shapes

## Coefficient of Drag - 2D versus 3D shapes

(OP)
Hi all,

In Hoerner, page 3-17, there is a table for drag coefficients of "3-dimensional bodies" and "2-dimensional shapes (between walls)". My question is, why is it that 2-Dimensional shapes have significantly higher drag co-efficient.

Let's say I have a curved panel and it is loaded as shown below. What would be the most appropriate drag coefficient for this problem statement?

I am by no means an expert in aerodynamic loading, and some assistance would be greatly appreciated.

Michael Palomar

### RE: Coefficient of Drag - 2D versus 3D shapes

the first 3d shape is a sphere, the dfirst 2D shape is a rod ...

Quando Omni Flunkus Moritati

### RE: Coefficient of Drag - 2D versus 3D shapes

(OP)
I figured, 3-D in my case will not work.

So in my case, the most representative drag co-efficient would be Cd = 2.30 from the 2-D column.

I just needed verification before I totally kill my analysis

### RE: Coefficient of Drag - 2D versus 3D shapes

so you've got an open arc column, worst case would be wind blowing into the arc

Quando Omni Flunkus Moritati

### RE: Coefficient of Drag - 2D versus 3D shapes

(OP)

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