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Step 7: Validate the Results
Report Force
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FLUENT report forces in term of pressure force and viscous force. For instance, we are interested in the drag on the airfoil,
(Drag)~total~ = (Drag)~pressure~ + (Drag)~viscous~
!force convention.jpg!
Drag due to pressure:
\\
{latex}
\large
$$
{(Drag)_{pressure}} = {\oint \-P \hat{n}.\hat{e_d}dS}
$$
{latex}
Drag due to viscous effect:
\\
{latex}
\large
$$
{(Drag)_{viscous}} = {\oint \tau_w \hat{t}.\hat{e_d}dS}
$$
{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.
\\
Similarly, if we are interested in the lift on the airfoil,
(Lift) = (Lift)~pressure~ + (Lift)~viscous~
Lift due to pressure:
{latex}
\large
$$
{(Lift)_{pressure}} = {\oint \-P \hat{n}.\hat{e_l}dS}
$$
{latex}
Lift due to viscous effect:
\\
{latex}
\large
$$
{(Lift)_{viscous}} = {\oint \tau_w \hat{t}.\hat{e_l}dS}
$$
{latex}
where
_e{_}{_}{~}l{~}_ is the unit vector perpendicular to the flow direction.
_n_ is unit vector perpendicular to the surface of airfoil.
_t_ is unit vector parallel to the surface of airfoil.
\\
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Report Force
We will first investigate the Drag on the airfoil.
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