Hello everyone;
Can you please guide me on how to apply the Neumann boundary condition in the Stokes equation on \Gamma_d?
\begin{equation}
\begin{cases}-v \Delta u+\nabla p=0 & \text { in } \Omega \ \nabla \cdot u=0 & \text { in } \Omega \ u=U & \text { on } \Gamma_d \ \sigma(u) \cdot n=F & \text { on } \Gamma_d\end{cases}
\end{equation}