Aeroelastic flutter analysis workflow (SOL 145)

Step	Summary	Detailed help topic
1.	Create the FEM and Simulation	In the New FEM and Simulation dialog box, set the solver to Simcenter Nastran and the analysis type to Aeroelastic.
2.	Specify the Simcenter Nastran solution	In the Solution dialog box, set the solution type to SOL 145 Aeroelastic Flutter.
3.	Idealize the part geometry	In the idealized part file, perform any necessary part idealizations.
4.	Construct the FE structural model	In the FEM file, create the FE representation of the structure. Define the structural mesh, material properties, and so on as you would for any other structural solution type.
5.	Mesh the aerodynamic surfaces	In the FEM file, use the Aero Panel command to mesh the aerodynamic surfaces with aero panels.Create an aero panel mesh for each aerodynamic surface. That is, create a distinct aero panel mesh for each wing, aileron, horizontal stabilizer, elevator, and so on.Note: You can also use the Aero Body command to mesh aerodynamic bodies such as fuselages, external tanks, and so on.	Create a mesh of aero panelsCreating aerodynamic panel meshesCreating aerodynamic body meshes
6.	(Optional) Create sets of structural nodes	In the FEM file, in preparation for interfacing the structural model with the aerodynamic surfaces, use the New Group command to create structural node sets. Create a set of structural nodes for each aerodynamic surface.Note: Although this step is optional, it allows you to avoid having to select the structural nodes individually when you create the splines.
7.	Interface the structural model with the aerodynamic surfaces	In the Simulation file, use the Aero Spline command to create splines that relate the motion of the structural model to the motion of the aero panels and aero bodies.Create one or more aero splines for each aero panel and aero body mesh.	Create an aero splineSpline options
8.	(Optional) Constrain the structural model	In the Simulation file, constrain the FE model as you would for any other structural solution type.
9.	(Optional) Specify the aero element correction factor	In the Simulation file, use the Aero Element Correction Factor command to use empirical data to correct the aeroelastic flutter model.
10.	Define the reference chord length and density	In the Simulation file, create an aerodynamic parameters modeling object that defines the reference chord length and the reference density.	Define aerodynamic parameters
11.	Define the flutter method and the aerodynamic conditions	In the Simulation file, create an aerodynamic flutter data modeling object that specifies the aeroelastic flutter analysis method, the aerodynamic conditions such as Mach number, density ratios, and so on at which to perform the aeroelastic flutter analysis, and the number of modes to output.	Define flutter method and aerodynamic conditions
12.	Create the Mach number versus reduced frequency table	In the Simulation file, create a modeling object that specifies the Mach number versus reduced frequency table.	Create M versus k table
13.	Assign the modeling objects to the solution	Edit the solution to assign the aerodynamic parameters and aerodynamic flutter data modeling objects to the solution.When editing the solution, you can optionally specify structural damping.	Assign a modeling object to a solution or solution subcaseAssign an aerodynamic matrix modeling object to the solution
14.	Specify the modal reduction	To reduce the computational effort required, edit the eigenvalue subcase to specify a real modal reduction.
15.	Solve the model	The Solution Monitor contains information about the status of your solution, and the Simcenter Nastran .f06 output file contains the requested results from your analysis.To locate the Simcenter Nastran .f06 file, right-click the solution and select Browse.
16.	Post-process the results	Use the post-processing commands to view the aeroelastic flutter analysis results.	Post-processing aeroelastic flutter analysis results
17.	Plot V-g and V-f results	To detect the flutter velocity, create plots of damping versus velocity (a V-g plot) and frequency versus velocity (a V-f plot).	Create V-g and V-f plots

How do I

Create a mesh of aero panels

Create an aero spline

Define aerodynamic parameters

Define flutter method and aerodynamic conditions

Create M versus k table

Assign a modeling object to a solution or solution subcase

Assign an aerodynamic matrix modeling object to the solution

Create V-g and V-f plots

Learn more

Aeroelastic flutter analysis (SOL 145)

Post-processing aeroelastic flutter analysis results

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Aeroelastic flutter analysis workflow (SOL 145), Simcenter 3D 2021.1 Series

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