The ANSYS ICEM-CFD/USM3D translator creates the input files necessary to run
the USM3D solver writing two FORTRAN unformatted files: xxxx.cogsg containing
information about the nodes and cells, and xxxx.iface containing information
about the faces, both internal and external. Additionally, there
is a formatted file with the extension .mapbc which details the boundary
condition information with respect to the part and surface patch
numbers, along with the part names.
Creating the USM3D Input Files
The translator writes the USM3D input files using an unstructured domain
file and its corresponding boundary conditions file. To create the USM3D
input file, under the ANSYS ICEM CFD "Output Menu", go to "Select Solver" and select the translator "USM3D". After clicking "Write Input" you can specify options
for the interface:
select an existing tetra domain file (default is cut_domain.1)
select the boundary condition file (default is boco)
specify the prefix for the USM3D input files (default is icem_mesh)
The interface generates the USM3D files in the current project directory.
Defining boundary conditions for USM3D
The boundary groups are defined by assigning a name to the external surfaces
of the model. To assign a boundary condition to a part, go to "Boundary Conditions" under the "Output Menu".
Please refer to the General Remarks
section for more
details on defining boundary conditions.
Defining Viscous Layers for USM3D
The viscous layers are defined by tagging a volume part with a boundary
condition To make such an assignment, go to Output Menu > Boundary
. Select the appropriate part, and select Viscous layer
as the type.
This interface is only written for 3D models composed of TETRA-4 elements.