CFD++ Interface

Solver	CFD++
Type of mesh	unstructured mesh
Dimension	2D and 3D

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The ANSYS ICEM CFD - CFD++ translator creates the input files necessary to run the CFD++ solver, version 96.03 and beyond. These are written in C-binary:

• Nodal Information File: This file is named "nodesin.bin". It contains the node type and node coordinates. The interface supports node type zero i.e. 3D coordinates for tridimensional configurations, and nodetypes 2, 4, or 6 for bidimensional configurations.
• Cell Information File: This file contains the type and connectivity of all cells. Three types of cells are supported in 3D: hexahedron, triangular prism and tetrahedron. In 2D, quadrangles and triangles are supported.  By default, the cell file is called "cellsin.bin".
• Boundary Condition File: The boundary conditions are defined with a list of boundary elements in the "exbcsin.bin" file. Group numbers are attributed to the boundary elements in order to differentiate different boundary conditions. The bcselector number is set equal to the group number in the translator.
• Internal Face File: The internal faces are written in the file "inbcsin.bin" and are attributed 2 bcselectors.
• Group boundary file:  The association group name and group number (bcselector ) is listed in this ASCII file called "mcfd.bc".
• Cell group name file: This file gives the number of cell groups and their names. It is written in ASCII and is called "mcfd.grp".
• Cell group number: This file lists the group number of each cell. It is written in C binary and is named "cgrpsin.bin.N, where N is the number of cell groups.
• Solution file: If results are found in the domain file, a CFD++ solution file is created. It is written in C binary and is called "cdepsin.bin".

Creating the CFD++ Input Files

The translator writes the CFD++ input files using an unstructured domain file and its corresponding boundary conditions file. To create the CFD++ input files, select the translator "CFD++" in the "Output" menu. After clicking "Write input" you can specify options for the CFD++ interface:

• select an existing unstructured domain file
• give the name of the boundary condition file
• option to use a parameter file (mcfd.param)
• Option to output cell groups files (mcfd.grp and cgrpsin.bin.N)
• option to give a scaling factor for each direction (default is 1.0)
• give the name of the directory for the CFD++ input files

The interface generates the CFD++ files in the user specified directory.

Defining boundary conditions for CFD++

The boundary groups are defined by assigning a name to the external surfaces of the model. The translator generates automatically default boundary groups for all external walls not named by the user. A default group is created for each external surface family.

Limitations

• This interface supports 3D models composed of HEXA-8, TETRA-4 and/or PENTA-6 elements, and 2D models composed of QUAD-4 and/or TRI-3 shell elements.

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