Ground Roughness - [source code]
Assign a multi-face ground plate to the wind tunnel: each face gets its own aerodynamic roughness length z0 and becomes its own ground patch (nutkAtmRoughWallFunction). Feed into the wind case component's Ground Roughness input.
Input
| Name | Nickname | Description | Type |
|---|---|---|---|
| Faces | Ground plate faces (meshes, breps, or surfaces), one per roughness zone. Faces must not overlap each other; together they replace the default inner ground surface. | Geometry | |
| Roughness Lengths | z0 | Aerodynamic roughness length z0 (m) per face; a single value applies to all faces, a short list repeats its last value. Typical: 0.0002 water, 0.03 open grass, 0.1 parks, 0.25 scattered obstacles, 0.5 suburbs, 1.0 forest/dense city. | Number |
| Names | Optional zone names (used for the OpenFOAM patch names, e.g. rough_water). | Text | |
| Refinement Level | RefLvl | Snappy surface refinement level for the zone patches. Optional; default is 2 (matches the Mesh Settings ground surface level default). | Integer |
Output
| Name | Nickname | Description | Type |
|---|---|---|---|
| Ground Zones | Zones | Ground roughness zone objects; plug into the wind case Ground Roughness input. | Generic Data |