ACRi Interface

Data Format	ACRi
Type of mesh	unstructured mesh (hexahedral elements only)
Dimension	3D

U

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The ICEM-CFD/ACRi translator creates the set of formatted input files necessary to run the ACRi CFD software.

Creating the ACRi Input Files

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

• select an existing unstructured domain file (project.uns)
• select the existing boundary condition file (family_boco.fbc or project.fbc)
• specify the filename base for the ACRi input files (default is acri)

A file with the extension .xyz contains the Vertex or Coordinate information.

The Element or Connectivity file has the extension .cnc and contains cell information (quadrilaterals in 2D and
hexahedra in 3D).

If there is periodic information in the mesh, a file with the extension .per will be created to reflect the locations
of the periodic paits in the grid.

If there is local refinement in the mesh, a file with the extension .blk will be created to include the appropriate
auxiliary connectivity data.

Finally, a Command Input file is generated unconditionally and contains the data set filenames, as well
as the grid dimension, number of elements, Sub-Region and Boundary defitinition.

The interface generates these ACRi files in the project directory.

Defining Boundaries for ACRi PAIRS

The boundary groups are defined by assigning a name to the external surfaces of the model. Enter the boundary face (PAIR) name under string 1 in the "general bnd. cond." menu.  Noting that string 1 is limited to five (5) characters, the interface will concatenate the entry of string 2 to the name in string1.  Please note that ACRi accepts only eight(8) characters for the PAIR ID names, so the interface will not reflect the entry in string 2 beyond three (3) letters.

Defining Sub-Regions for ACRi LIST

The sub-regions are defined by assigning a name to the cells of the model, in a like manner to defining boundaries above. Enter the boundary face (PAIR) name under string 1 in the "general bnd. cond." menu.  Noting that string 1 is limited to five (5) characters, the interface will concatentate the entry ofstring 2to the name in string1.  Please note that ACRi accepts only eight(8) characters for the LIST ID names, so the interface will not reflect the entry in string 2 beyond three (3) letters.

Please refer to the General Remarks section for more details on defining boundary conditions.
 
Limitations

• This interface currently supports unstructured hexahedral grids.

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