Windtunnel/Boundary Conditions

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Open Questions

Reflective cells

Setting the vector ${\overrightarrow{v}}_g$ in a ghost cell as ${\overrightarrow{v}}_g=-\overrightarrow{v}$, with $\overrightarrow{v}$ being the value in the adjacent real cell, yields $\overrightarrow{0}$ as interpolation right at the boundary. This works for plane walls. What to do in cases where a ghost cell has more than one real cell as nearest neighbor? This calls for discussion!