The center of the coordination system is chosen in the center of the cylinder.
For the mesh the domain was divided into 5 subdomains.
One subdomain consists of the \SI{1.8}{\metre} on the side of the outlet without the cylinder.
On this part (called \enquote{pipe}) the grading is chosen in a way that the cells closest to the cylinder are smaller than those at the outlet and almost of the same size as the neigboring cells in the neigboring subdomain.
