Cyclic symmetry solutions (Simcenter Samcef)

Solving a multi-stage cyclic symmetry reference model

You can solve multi-stage cyclic symmetry models in Linear Static, Modal, Nonlinear, Linear Transient Response, or Linear Harmonic Response analyses.

In a Modal, Linear Transient Response, or Linear Harmonic Response analysis, you must select the Activate Cyclic Symmetry check box and define the Wave Number in the solution dialog box. For information on the wave number, see Wave number in cyclic symmetry solutions (Simcenter Samcef).

Recombining a multi-stage cyclic symmetry reference model into a 3D structure

After you complete an analysis of multi-stage cyclic symmetry reference sectors, you can recombine the results on the complete 3D structure.

You can recombine a previously computed Solution that exists in the model or recombine a solution available in an External File. Depending on that selected source solution:

• If the source solution is a Linear Static Analysis solution, you can perform the recombination for all the load cases or for a selection of them. You can also compute the Dynamic Stresses.

• If the source solution is a Modal Analysis solution, you can perform the recombination for all the modes or for a selection of them.You can also compute the Dynamic Stresses and Modal Kinetic And Strain Energies.

• If the source solution is a Nonlinear Analysis solution, you can perform the recombination for all the time steps or for a selection of them.You can also compute the Dynamic Stresses.

• If the source solution is a Linear Transient Response or Linear Harmonic Response solution, you can perform the recombination for all the modes or for a selection of them.You can also compute the Dynamic Stresses.

Note:

• Stresses are computed in a frame attached to each recombined sector. In example, for sector j, it corresponds to a rotation of (j-1) * 2 PI / N of the structural system of axes, where N is the total number of sectors of the corresponding stage.

• The recombination is performed by the Simcenter Samcef DYNAM solver.

• To recombine your model at a later stage and to compute the 3D stresses or energies, you must keep some temporary files that were created during your cyclic symmetry reference model solve.

Keeping solution temporary files for recombination purposes

If you want to recombine your model at a later stage and if you want to compute the 3D stresses or energies, you need to keep some important files of the cyclic symmetry reference model solve.

In all cases, you need the [cyclic_symmetry_simulation_file_name].sdb database, as well as the [cyclic_symmetry_simulation_file_name]_*.u18 results file. These two files are by default kept when you solve your cyclic symmetry reference model.

If you want to compute dynamic stress or energies during the recombination, you also need extra files:

• If you want to compute the dynamic stresses, for all the source solution types, you need the [cyclic_symmetry_simulation_file_name]_as.u04 file.For more information, see Compute Dynamic Stress (.SAM ISTO 8) in Solution dialog box (Simcenter Samcef Cyclic Symmetry Recombination Analysis).

• If the source solution is a Modal Analysis solution and if you want to compute energies, you need the [cyclic_symmetry_simulation_file_name]_dy.u11 and the [cyclic_symmetry_simulation_file_name]_dy.u12 files.For more information, see the Compute Modal Kinetic And Strain Energies (.ALGO ENEARCH 1) in the Solution dialog box (Simcenter Samcef Cyclic Symmetry Recombination Analysis).

To keep all these extra files from the cyclic symmetry reference model solve to the recombination solve, you must select the Keep Samcef Temporary Files check box in the Solver Parameters when you solve your cyclic symmetry reference model.

Where do I find it?

Cyclic Symmetry modal solution options

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Samcef as the specified solverStructural as the specified analysis typeModal Analysis, Linear Transient Response Analysis, or Linear Harmonic Response Analysis as the specified solution type
Simulation Navigator	Right-click an active solution→Edit
Location in dialog box	Modal Analysis:Analysis page→Cyclic Symmetry groupLinear Transient Response Analysis or Linear Harmonic Response Analysis:Modal Parameters page→Cyclic Symmetry group

Cyclic Symmetry Recombination solution and options

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Samcef as the specified solverStructural as the specified analysis typeCyclic Symmetry Recombination as the specified solution type
Simulation Navigator	Right-click an active solution→Edit

Learn more

Linear static solution options (Simcenter Samcef)

Modal solution options (Simcenter Samcef)

Buckling solution options (Simcenter Samcef)

Standalone buckling solution options (Simcenter Samcef)

Solver types (Simcenter Samcef)

Reordering methods in Simcenter Samcef solvers

Creating a Simcenter Samcef superelement for Pre/Post system models

Recovering results inside a Simcenter Samcef superelement

Enabling bolt forces or displacements in subcases (Simcenter Samcef)

Incremental stability (Simcenter Samcef)

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Cyclic symmetry solutions (Simcenter Samcef), Simcenter 3D 2021.1 Series

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