# Upload Volume Mesh

  1. Both CGNS and UGRID formats are supported.
  2. Both *.gz and *.bz2 compressions are supported.
  3. Tetrahedron, Pyramid, Prism and Hexahedron cells are allowed, Polyhedron cells are NOT supported.
  4. Here are the best practices when manually preparing the mesh (opens new window).

# CGNS

  1. Description of CGNS mesh format (opens new window).
  2. Both single- and multi-block are supported.
  3. CGNS files exported from ANSA and Pointwise are well tested and supported.

# UGRID (AFLR3)

  1. Description of UGRID mesh format (opens new window).
  2. Both big- (.b8.ugrid) and little- (.lb8.ugrid) endianness are supported. Description of endianness (opens new window).
  3. If the endianness is not specified in the mesh filename, then you must select one when uploading the mesh.
  4. If you don't know the endianness, we recommend trying little-endian first as it's more common in newer architectures/systems.

# Flow360Mesh.json

In addition to the mesh file, you also need to provide description of:

  1. No Slip Walls of your mesh.
  2. Sliding Interfaces if there are any in your mesh.

The data can be provided either manually in the text box, or uploaded as a JSON file. See the format and examples below:

For the UGIRD file, if surfaces 1, 2, and 3 are noSlipWalls then the Flow360Mesh.json should look like this:

{
    "boundaries": {
        "noSlipWalls": [1,2,3]
    }
}

For the CGNS file, consider a propeller, enclosed by a sliding interface, located in front of a fuselage, the Flow360Mesh.json should look like this:

{
    "boundaries": {
        "noSlipWalls": ["rotatingBlock/propeller", "stationaryBlock/fuselage"]
    },
    "slidingInterfaces": [
        {
            "stationaryPatches": ["stationaryBlock/interface"],
            "rotatingPatches": ["rotatingBlock/interface"],
            "axisOfRotation": [1,0,0],
            "centerOfRotation": [0,0,0]
        }
    ]
}

where rotatingBlock and stationaryBlock are the names you assigned to the blocks, whereas propeller, fuselage, and interface are the names you assigned to the surfaces in the meshing software.

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