ANSYS POLYFLOW Interface

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The interface writes coordinate, connectivity and boundary condition information in the Patran-based ANSYS POLYFLOW format. The following Patran packets compose the input file created with this interface:

• Packet 25: Title Card
• Packet 26: Summary Data
• Packet 01: Node Data
• Packet 02: Element Data
• Packet 06: Distributed Loads
• Packet 07: Node Forces
• Packet 99: End of Neutral File

Creating the ANSYS POLYFLOW Input File

The translator writes the ANSYS POLYFLOW Neutral File Version 2.4 using an unstructured domain file and its boundary condition file. To create the ANSYS POLYFLOW input file, select the translator "ANSYS POLYFLOW" in the "Output" menu from the ICEM CFD/CAE Manager. After clicking "Write output" you can specify options for the ANSYS POLYFLOW interface:

• select an existing unstructured domain file
• give the name of the boundary condition file

(default is configuration/parts_mesh/mesh/boco)
• give the name of the ANSYS POLYFLOW input file

(default is configuration/parts_mesh/transfer/configuration.poly)
• enter a scaling factor for the coordinates in the geometry file (optional)

The interface generates the ANSYS POLYFLOW file located in the Transfer Shell. You may open a shell window in this directory by selecting the menu items "Utility" and "Transfer Shell".D

Defining boundary conditions for ANSYS POLYFLOW

In MULCAD the boundary conditions are defined in the "Unspec. Bound. Cond." menu. In the DDN-Mesher Interface, the "general bound. cond." menu is used. Please refer to the General Remarks section for more details. For P-CUBE, the NAME field and ID # icon are used to prescribed the ANSYS POLYFLOW boundary conditions. Three types of boundary conditions/properties are available for ANSYS POLYFLOW, distributed loads, nodes forces and PID numbers.

Distributed Loads:

        MULCAD          DDN-Mesher      P-CUBE
        ------          ----------      ------
        1.FLAG          1.string1       NAME field      Enter the word DISTR
        2.NR            3.integer       ID # icon       Enter the load ID number

The element numbers and their load ID are written out in Packet 6. The boundary condition DISTR is only recognized on subfaces for a 3D model and on edges for a 2D model.

Node Forces:

        MULCAD          DDN-Mesher      P-CUBE
        ------          ----------      ------
        1.FLAG          1.string1       NAME field      Enter the word NODE
        2.NR            3.integer       ID # icon       Enter the node ID number

The node numbers and their load ID are written out in Packet 7. The boundary condition NODE is available on subfaces, edges and vertices for a 3D model and on edges and vertices for a 2D model.

Element PID:

        MULCAD          DDN-Mesher      P-CUBE
        ------          ----------      ------
        1.FLAG          1.string1       NAME field      Enter the word PID
        2.NR            3.integer       ID # icon       Enter the PID number

The element PID are written out in Packet 2. They must be defined on domains for a 3D model and on subfaces for a 2D model. Their default value is 1.

Limitations

It is assumed for the moment that there is no need to define boundary conditions on interfaces since ANSYS POLYFLOW expects the load sets to be defined on the boundaries of the domain only.

ANSYS POLYFLOW does not allow a mix of 2D and 3D elements in the same model. The type of elements recognized by the ANSYS POLYFLOW Translator are:

• in 2D:
• 3 or 6 points triangle
• 4 or 9 points quadrilateral
• in 3D:
• 4 or 10 points quadrilateral
• 8 or 27 points hexahedral
• 6 or 18 points wedge pentahedral
• 5 or 14 points pyramidal pentahedral

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