| 62 | | Due to the large stencil of WS5, additional ghost layers are necessary on each lateral boundary of each processor subdomain to avoid local data dependencies. Therefor the exchange of ghost layers is adapted to a dynamic number of ghost layers. |
| 63 | | For the bottom and top boundaries a successive degradation from WS5 to WS3 to a 2^nd^ order scheme is required to avoid unphysical fluxes which would arise from the bottom and top ghost layers. The used 2^nd^ order scheme is based on a flux discretization to ensure consistency with the WS-schemes. The PW-scheme cannot be used, because its a skew symmetric dicretization. Furthermore an additional numerical dissipation term of 2^nd^ order, based on (Shchepetkin and McWilliams, 1998) is required for the 2^nd^ order scheme to perform a numerically stable switching of advection schemes of different order. |
| 64 | | These successive degradation is also done for the lateral radiation boundary condition at the outflow and near topography (Note: Topography is currently not implemented). |
| | 62 | Due to the large stencil of WS5, additional ghost layers are necessary on each lateral boundary of each processor subdomain to avoid local data dependencies. Therefore, the exchange of ghost layers is adapted to a dynamic number of ghost layers. |
| | 63 | For the bottom and top boundaries, lateral non-cyclic boundaries and near topography walls a successive degradation from WS5 to WS3 to a 1^st^ order scheme is required. The used 1^st^ order scheme is based on a flux discretization to ensure consistency with the WS-schemes. The PW-scheme cannot be used, because its a skew symmetric discretization. |
