The interface writes coordinate, topology, and boundary condition information in the NS3D input file format.
The translator writes the NS3D input file using the domain file(s), the boundary condition file(boco) and, if structured, the topology file (topo_mulcad_out) generated in ICEM. The structured domains can be created by PADAMM, P-CUBE or the HEXA-Mesher (Multiblock) and the unstructured domains can be generated in PADAMM, the HEXA-Mesher (Unstructured) or the TETRA-Mesher.
To create the NS3D input file, select the translator "NS3D" in the "Output" menu of the ICEM CFD/CAE Manager. After selecting "Write input" from the same menu, specify the following options for the NS3D interface:
The interface generates the NS3D input file located in the Transfer shell. A shell window may be opened in this directory by selecting the menu items "Utility" and "Transfer Shell".
The boundary conditions must be defined on surfaces for a 3D model and on edges for a 2D model. They are defined using the "Unspec. Bound. Cond." menu in MULCAD or the "General bound. cond." menu in the DDN-Mesher Interface. Please refer to the General Remarks section for more details.
Identical, symmetry or periodic plane/edge:
To specify an identical, periodic or symmetry plane (or edge in 2D), simply assign the keyword IDENT, PERIO or SYMM to the selected area.
MULCAD DDN-Mesher P-CUBE ------ ---------- ------ 1.FLAG 1.string1 NAME field Enter IDENT, PERIO or SYMM
Exit, inlet or wall:
To specify an exit, inlet or wall, simply assign the keyword EXIT, INLET or WALL to the selected plane (or edge if 2D). The exit, inlet or wall number are set to one by default, but can be set to any integer from 1 to 999.
MULCAD DDN-Mesher P-CUBE ------ ---------- ------ 1.FLAG 1.string1 NAME field Enter EXIT, INLET or WALL 2.NR 3.integer ID # icon Enter the number
The interface supports linear and quadratic elements. The eligible types of elements are:
STRUCTURED UNSTRUCTURED _____________________ ______________________ 2D 3D 2D 3D _____________________ ______________________ Linear QUAD_4 HEXA_8 QUAD_4 HEXA_8 TRI_3 TETRA_4 PENTA_6 Quadratic QUAD_8 HEXA_20 QUAD_8 HEXA_20 TRI_6 TETRA_10 PENTA_18 _____________________ ______________________
Note that for NS3D, the quadratic elements QUAD_8 and HEXA_20 are written from the QUAD_9 and HEXA_27 elements produced in ICEM.