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  • FLUENT - Flow over an Airfoil- Step 7

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titleForce Convention
Wiki Markup

 !force convention.jpg!
Here's the convention for drag due to pressure:

{latex}
\large
$$
{(C_d)_{pressure}} = {\oint \-P \hat{n}.\hat{e_d}dS}
$$
{latex}

\\


{latex}
\large
$$
{(C_d)_{viscous}} = {\oint \tau_w \hat{t}.\hat{e_d}dS}
$$
{latex}

where

e{~}d~ is the unit vector parallel to the flow direction. 

n is unit vector perpendicular to the surface of airfoil.

t is unit vector parallel to the surface of airfoil.
\\
Image Removed

This is an inviscid model, we are expecting a drag coefficient of zero, and yet there is a small drag coefficient that present. We should investigate more into this.
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