COBALT Interface

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The ICEM CFD - COBALT output interface creates grid and boundary conditions files in accordance with the COBALT file format.

Creating the COBALT Input File

The COBALT output interface can be invoked from the AI*Environment.  Under the menu "Output", "Select solver", select "COBALT".  Then select "Write input".   A window opens to allow the specification of the files to be translated into the COBALT format.  An existing unstructured domain file must first be selected.   In addition, the output interface requires the boundary conditions file and the offset value for patch numbering. It also offers the option to define the name of the COBALT input files, three scaling factors, the file format and the data precision.  Default names for the boundary condition and COBALT files are given.  These can be modified as necessary. The translator adds the suffix ".bc" to the COBALT boundary condition file. The interface generates both the COBALT grid and boundary condition files in the current project directory.

Defining boundary conditions for COBALT

After generating the mesh, and prior to running the translator, boundary conditions for COBALT can be defined using the COBALT Graphical User Interface. Under the menu "Output", "Select solver", select "COBALT". Then click on the "Boundary Conditions" icon. The "Family Boundary Conditions" window opens allowing to set boundary conditions on the mesh families. Six boundary conditions types are available; Farfield, Rotor/Propeller, Sink, Solid Wall, Source and User Specified.

After selecting a boundary condition type, a window opens with options for the chosen type. The following paragraphs give more details on the settings required for each boundary condition type. Note that by default, the boundary condition name is set to the family name.  This can be modified in each boundary condition window.

1. Farfield

  • In addition, values for the static pressure and temperature, turbulent kinetic energy and omega, Mach number and angles of attack and sideslip must be entered.
  • 2. Sink

    3. Source

    4. Solid Wall

    5. Rotor/Propeller

    6.  User specified

    Please refer to the General Remarks section for more details on how to set boundary conditions.  The boundary condition types are defined with a negative integer. Please refer to the COBALT User's Manual for the complete list of boundary condition types supported by the flow solver.

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