CFX-4 Interface

Solver	CFX-4
Type of mesh	structured mesh
Dimension	2D and 3D

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The CFX-4 interface:

• creates a geometry file which consists of two parts, a topology part (which contains topology and boundary condition data) and the grid part.
• supports multiblocks structured grids.
• supports boundary conditions on surfaces and blocks.
• supports non C0-contiguous interfaces between blocks, allowing local refinement.

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Creating the CFX-4 Input File

The input for the translator is composed of a multiblock structured mesh, its boundary condition file and associated topology file. To create the CFX-4 input file(s), select the translator "CFX-4" in the "Output" menu. After clicking "Write input" you can specify options for the CFX-4 interface:

• select a multiblock mesh
• give the name of the boundary condition file
• give the name of the topology file
• give the name of the CFX-4 Geometry file (the default is cfx4)
• option to give a scaling factor for each direction (default is 1.0)
• option to specify the thickness, for planar 2D meshes only.
• option to create the CFX command file.

The interface generates the CFX-4 file(s) in the project directory.

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Supported boundary conditions for CFX-4

• Blocks:
• On each block the user can define a block name, 3D boundary condition type and a patch group number.
• The default block name is domain.x, where x is the domain number.
• The default patch group number is 1.
• The interface does not generate a default boundary condition type.
• Faces:
• On each surface the user can define a patch name, 2D patch type and a patch group number.
• The default patch name is sf.x, where x is the subface number.
• The default patch group number is 1.
• The interface does not generate a default 2D patch type on boundary faces.

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Defining boundary conditions for CFX-4

The boundary conditions can only by applied to surfaces and blocks. Please refer to the General Remarks section for more details.

I.  3D boundary condition or 2D patch type:

    A list of flags are recognized by the translator and the CFX-4 solver for 3D boundary condition and 2D patch type.
    After selecting a 3D or 2D topological entity, select one of these flags.

• Block flags:
• 3D patch
• conducting solid
• porous medium
• solid medium
• Face flags:
• 2D patch
• conducting boundary
• inlets
• interface
• outlet mass flow
• pair of walls
• pressure
• symmetry plane
• walls

II.  Block or patch name:

    After selecting a block or surface family, select "Block or patch name" in the boundary condition GUI then enter a name.

    A patch type must be defined on boundaries for a patch name to be recognized.
    A patch name alone is NOT recognized as a valid boundary condition.  However, a patch type alone is valid.

III.  Patch group number:

   To specify the patch group number, select "Patch group number" in the boundary condition GUI then enter a number.

IV.  Periodic information:

   For meshes with periodic faces, the translator automatically generates the periodic patch information.
   Any other boundary settings on periodic faces are ignored.

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