Creating aerodynamic body meshes

You can use the Aero Body mesh primitive command to model an aerodynamic slender body and interference elements that represents the fuselage in a subsonic aeroelasticity analysis using the Doublet-Lattice theory. You can also use an Aero Body mesh primitive to model external storage bodies, such as fuel tanks. You can use the options in the Aero Body dialog box to create an aerodynamic body comprised of nonstructural 2D CAERO2 elements.

Aeroelasticity analyses study the stability and response of aeroelastic systems. In subsonic analyses, bodies are idealized as a combination of slender body elements and interference elements.

• Slender body elements account for the forces that arise from the motion of the fuselage.

• Interference elements are used in calculations that cancel most of the effects of the trailing vortices from the lifting surfaces. Interference elements lie on a surface that is approximated by a constant elliptical cross-section cylinder called the interference body or tube. The interference body is divided into the interference elements.

Assigning the body to an interference group

You must assign each aerodynamic body to an interference group. You use the Interference Group ID option in the Aero Body dialog box to specify the ID value for the interference group to which the body belongs.

Defining the slender body and interference elements

• Use the Location and Dimension options to specify the starting point (leading point) of the aerodynamic body and the length of the aerodynamic body along the flow direction.Note: The X axis of the specified coordinate system defines the flow direction.

• The density of the mesh along the length of the aerodynamic body.Note: You must use the Body Element Divisions option to define at least two elements on the aerodynamic slender body and the Interference Element Divisions option to define at least one interference element on the interference body.

Defining the physical properties of the aero body

You must define a PAERO2 physical property table to define the orientation and cross-sectional properties of the aerodynamic body and the interference body and the sampling data to account for the residual flow. You can use options in the PAERO2 dialog box to specify:

• The direction in which the aerodynamic slender body is allowed to move.

• The cross-sectional widths of the aerodynamic slender and interference bodies.

• The list of theta divisions along the interference body.

Defining the aero coordinate system

You can use the Global Aero CSYS option in the Aero Body dialog box to specify the Cartesian coordinate system for the aerodynamic calculations. The X-axis of this coordinate system defines the flow direction for the analysis.

Working with an aero body mesh

The software stores the meshes that the Aero Body command generates in an Aero Body node in the Simulation Navigator.

An aerodynamic body mesh is FE-based and is not associated with the underlying geometry. The software does not update FE-based meshes if the underlying part geometry is modified. When you create an aerodynamic body, the software stores the options and settings you used to create the mesh. If you edit the mesh and change a setting, such as the element type or offset distance, the software recreates the mesh with the new settings.

Where do I find it?

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis type
Command Finder	Aero Body

PAERO2 physical property table

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis type
Command Finder	Physical Properties
Location in dialog box	Type→PAERO2

Learn more

Creating meshes for Nastran aeroelasticity analyses

Creating aerodynamic panel meshes

Checking aerodynamic panel meshes

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Creating aerodynamic body meshes, Simcenter 3D 2021.1 Series

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