FLEX Interface

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Solver	FLEX
Type of mesh	unstructured mesh
Dimension	2D and 3D

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The FLEX translator creates an unstructured grid file in the "Flex File" format. The three-dimensional coordinates are written using the keyword :xyz. For a model composed of three-dimensional elements, face-to-node and face-to-cell connectivites are written under the keyword :connectivity_faces. For surface mesh, the face connectivity is defined with the :front_faces keyword format.

Creating the FLEX Input File

The translator writes the FLEX input file using an unstructured mesh file and its corresponding boundary conditions file. To create the FLEX file, "Select solver" → FLEX in the "Output" menu. After clicking "Write input " you can specify the following options for the interface:

• select an existing unstructured domain file
• give the name of the boundary condition file
• give the name of the FLEX input file
• option to give a scaling factor for each direction (default is 1.0)
• option to write the file in Fortran-binary or ASCII
• option to write the node's coordinates in single or double precision

Defining boundary conditions for FLEX

The translator generates automatically the boundary groups. For grids generated with the HEXA-Mesher or the TETRA-Mesher, the external surface families are used directly to create the different boundary groups.

Available element types

The type of elements supported by the FLEX translator are:

• in 2D:
  • 3 nodes triangle
  • 4 nodes quadrilateral
• in 3D:
  • 4 nodes tetrahedral
  • 8 nodes hexahedral
  • 6 nodes wedge pentahedral
  • 5 nodes pyramidal pentahedral

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