USM3D Interface


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: 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 Conditions. Select the appropriate part, and select Viscous layer as the type.