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Kutta Condition

States that the flow must leave the trailing edge smoothly, implying zero velocity jump. This condition determines the circulation \Gamma, which is crucial for lift calculation.
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The statement of the theorem

Let zTz_T be the trailing edge point. The Kutta condition requires the velocity field v⃗\vec{v} to be smooth at zTz_T, implying that the jump in the normal component of the velocity across the trailing edge must vanish: lim⁡ϵ→0[v⃗⋅n⃗]upper→lower=0\lim_{\epsilon \to 0} [\vec{v} \cdot \vec{n}]_{\text{upper} \to \text{lower}} = 0. This condition determines the unique circulation Γ\Gamma such that the flow leaves the trailing edge tangentially.