VSAERO/USAERO Interface

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This interface writes a VSAERO or a USAERO input file from an ANSYS ICEM CFD structured grid, or a VSAERO input file from an ANSYS ICEM CFD unstructured grid. USAERO is a code developed from VSAERO. The main difference is that USAERO can do unsteady computation.

Creating the VSAERO / USAERO Input File

The translator writes the VSAERO / USAERO geometry file using a set of structured domain file(s) (domain.1 to domain.n), or writes a VSAERO geometry file using a single unstructured domain file. To create the VSAERO / USAERO input file, go to "Select Solver" in the "Output Menu", and select the translator "VSAERO / USAERO". After clicking "VSAERO input" you can specify options for the VSAERO / USAERO interface:

• select the input mesh:  set of 2D domain file(s) or single 2d unstructured file (surface triangulation)
• select left or right-handed coordinate system (default is right)
• for structured mesh only: select between VSAERO or USAERO input file (default is VSAERO)
• option to specify a scaling factor
• give the name of the input boundary condition file

give the name of the VSAERO / USAERO input file

The interface generates the VSAERO / USAERO file in the current project directory.
 

Defining parameters and boundary conditions for VSAERO / USAERO

After generating the mesh, and prior to running the translator, boundary conditions and parameters for VSAERO/USAERO can be defined. Under the "Output Menu", go to "Select solver", and select "VSAERO/USAERO".

Parameters for cards 1 to 7 and card 9

Select option "VSAERO params".   A window opens listing the VSAERO cards.  The user can then set up the parameters for each VSAERO card.  This data is recorded in file "vsaero.par".  If this file doesn't exist, the translator uses the default file "vsaero.header" located in the output-interfaces directory.

Boundary Conditions (card 10)

From the "Output Menu", select "Boundary Conditions" and the current boundary condition file to edit (default is "family_boco.fbc").   The "Family Boundary Conditions" window opens allowing to set the boundary conditions on the mesh parts (patches) as per the VSAERO/USAERO CARD 10 specification.

• Component name: This name is used to compute the value of KOMP if components are defined in the parameter file (card 9).
• Patch type, IDENT:  The supported types are:
• For structured mesh:
• Thick surface: sectional quantities (type 1)
• Thick surface: no sectional quantities (type 2)
• Thin surface: no streamline or BC (type 3)
• Thin surface: total energy different on lower side (type 5)
• Thin surface: vortex-lattice (type 6)
• For unstructured mesh:
• Unstructured thick surface (type 10)
• Unstructured thin surface (type 11)
• Assembly ID number (KLASS)
• For structured mesh only: Patch orientation (N)
• For structured mesh only:  Tip patch generator (MAKE)
• For structured mesh only:  Folded patch number (M)
• For unstructured mesh only: Surface normal input (NORM)
• None (NORM = 0)
• Normals provided at corner points (NORM=1)
• Normals provided at control points (NORM=2)

Note that in order for VSAERO/USAERO to run, CBAR, SREF and SSPAN must be defined by the user. Their values must be different from zero since they are used to undimensionalize.
 

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