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The lift L is specified as (neglecting viscous shear):

Latex
Wiki Markup
{latex}\begin{eqnarray}
L = [\int_S p\hat{n}dA \cdot j]
\end{eqnarray}
{latex}

Fluent can only integrate for the lift coefficient over sections specified as walls; in this problem some sections of the cylinder wall will be specified as velocity inflows or outflows and not as walls. User-defined functions (UDFs) will be used to integrate over the entire cylinder for the lift coefficient. User-defined functions are C functions used to enhance features of the FLUENT solver.

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