Static aeroelastic response analysis (SOL 144)

You can perform a static aeroelastic response analysis in Pre/Post using the Simcenter Nastran SOL 144 Static Aeroelastic Response solution sequence. A static aeroelastic response analysis evaluates the effect of steady-state aerodynamic forces on a rigid or flexible structure. The resulting structural deflections perturb the aerodynamic forces. The solution to these problems occurs when the system comes to a state of static (or quasi-static) equilibrium.

SOL 144 Static Aeroelastic Response is typically used to perform the following types of analyses:

• Trim load analysis of rigid and flexible aircraft

• Stability and control derivative analysis

• Control effectiveness (control reversal) analysis

• Static aeroelastic instability (divergence) analysis

Simulation objects

The simulation objects that you must create depend on the type of static aeroelastic response analysis. For a static aeroelastic response analysis, you create the following simulation objects:

• Aero Spline Creates the spline that interfaces the structural mesh with the aerodynamic panel mesh.

• Aero Element Correction Factor Defines the optional correction factors that adjust the force and moment so that they agree with experimental data for incidence changes.

• Aerodynamic Control Surface Defines aero panel meshes as aerodynamic control surfaces such as ailerons and elevators for trim analysis only.

Modeling objects

The modeling objects that you must create depend on the type of static aeroelastic response analysis. For static aeroelastic response analysis, you create the following modeling objects:

• Aerodynamic Static ParametersDefines the reference chord length, reference span, reference wing area, and, if applicable, planes of symmetry.

• Aerodynamic Divergence Data (for divergence analysis only)Defines the desired number of roots and the Mach numbers at which to perform the divergence analysis.

• Complex Eigenvalue (for divergence analysis only)Defines the complex eigenvalue method and eigenvalue extraction parameters to use in the divergence analysis.

Trim variables manager

For a trim analysis, you use the Trim Variables Manager command to do the following:

• Define the Mach number, dynamic pressure, and trim analysis type.

• Specify the standard and user-defined trim variables.

• Assign values to the trim variables.

• Link trim variables.

For more information on the Trim Variables Manager command, see Defining trim variables.

Constraints

How you constrain a static aeroelastic response analysis model depends on the type of analysis you are performing. For a trim analysis, you use fictitious supports and, if applicable, single-point constraints to balance the applied loads and prevent singularities from arising. For detailed information on how to constrain a trim analysis model, see Constraints in trim analysis.

For divergence analysis, you use single-point constraints only to balance the applied loads and prevent singularities from arising.

Margin of safety interface

Because the underlying structural model in a SOL 144 trim analysis is linear static, you can use the results of a SOL 144 trim analysis in a margin of safety analysis. With this capability, you can evaluate margin of safety based on the aerodynamic loads predicted in a SOL 144 trim analysis.

After you solve the SOL 144 trim analysis, the software lists the SOL 144 trim solution with the other solutions that are available for the margin of safety analysis.

Post-processing options

Simcenter Nastran writes the static aeroelastic response analysis results and model geometry to an OP2 file. Pre/Post can access some of the results in the OP2 file for post-processing and plotting.

The results that Simcenter Nastran writes to the OP2 file include:

• Aerodynamic panel geometry defined as Q4AERO and T3AERO elements is written to the GEOM2 data block.Q4AERO and T3AERO elements are elements that Simcenter Nastran generates during the aeroelastic flutter analysis solve.

• Aeroelastic forces are written to an OAEROF data block.

• Aeroelastic pressures and pressure coefficients are written to an OAEROP data block.

• Aeroelastic control surface position and hinge moment are written to an OAERCSHM data block.

• Aeroelastic hinge moment derivative coefficients are written to an OAEROHMD data block.

• Aeroelastic stability and control derivative coefficients are written to an OAEROSCD data block.

• Aeroelastic trim variables are written to an OAEROTV data block.

Depending on the output requests that you specify, from the structural displacement results in the static aeroelastic analysis, Simcenter Nastran recovers results such as element stresses and forces, SPC forces, and so on. These results are written to the OP2 file in the same data blocks as equivalent results from a SOL 101 linear static analysis.

Additional information

For a summary of the static aeroelastic response analysis capability in Simcenter Nastran SOL 144, see the Simcenter Nastran Advanced Dynamic Analysis User's Guide in the Aeroelastic Solutions section of the Dynamic Solution Techniques chapter.

For complete information on the static aeroelastic response analysis capability in Simcenter Nastran SOL 144, including the underlying aeroelastic theory and sample problems, see the Simcenter Nastran Aeroelastic Analysis User's Guide.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis type
Command Finder	Solution

How do I

Assign a modeling object to a solution or solution subcase

Define an aerodynamic control surface

Create a static aeroelastic subcase

Define aerodynamic divergence data

Create an aerodynamic divergence subcase

Create a fictitious support

Plot trim conditions

Learn more

Aeroelastic divergence analysis workflow (SOL 144)

Aeroelastic trim analysis workflow (SOL 144)

Defining trim variables

Constraints in trim analysis

Post-processing aeroelastic trim analysis results

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Static aeroelastic response analysis (SOL 144), Simcenter 3D 2021.1 Series

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