Protective Layers

Use a Protective Layers simulation object to add thermal barrier coatings on top of thermal elements for protective layer heat transfer modeling and account for added mass distribution in a structural modeling. You can:

• Create multiple protective layers.

• Assign different material properties for each layer.

• Vary the thickness of each layer in a spatial field.

• Apply thermal boundary conditions on layers.

• Post process contour plots at the top, bottom, and middle of any layer.

• In structural or coupled structural analyses, export the protective layers as a single mass matrix, or multiple mass matrices.

You can view the elemental temperature for the bottom, middle, and top protective layer of the various plies.

When you apply a Protective Layers simulation object with two layers to your model, you display the temperatures of the two layers in the Temperatures Protective Layer Bottom Face – Elemental, Temperatures Protective Layer Middle – Elemental, and Temperatures Protective Layer Top Face – Elemental nodes in the Post Processing Navigator using the Top and Bottom shell selection commands.

Exporting and importing protective layers as DMIGs

The Protective Layers simulation object computes the distribution of mass through the layers. For Simcenter Nastran and Simcenter 3D Multiphysics, you can export the mass distribution of the protective layers to single or multiple Simcenter Nastran DMIGs (Direct Matrix Input at Gridpoints) that contain the mass values at nodes you selected in the Protective Layers thermal boundary condition. The exported mass values are the same whether you export to a single matrix or multiple matrices. However, exporting the protective layers as multiple matrices gives you the flexibility to edit the input file by adding or removing individual layers, or by adjusting the scale factor for individual layers. You can then solve the updated input file in Simcenter Nastran.

• A single matrix of multiple layers is exported with one name, for example, M2GG = PL0001.

• Multiple matrices are exported with a name for each layer, for example, M2GG = PL000101,PL000102,PL000103,PL000104 for four layers.

When you import the .dat file, a Protective Layers simulation object is not created. Instead, the Matrix Collectors node in the Simulation Navigator is updated with a single mass matrix or multiple mass matrices, depending on the export option you selected when you created the Protective Layers simulation object.

Plotting thickness, mass, and area density

You can visualize thickness as contour plots for individual layers, and you can visualize mass or area density as contour plots for individual layers or for all layers combined. To do so, in the Simulation Navigator, right-click the Protective Layers simulation object and choose Plot Contours.

For more information, see Generate contour plots of boundary conditions and Boundary Condition Contour Plot dialog box.

Example contour plot of total mass	Example contour plot of total area density

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter 3D Thermal/Flow, Simcenter 3D Space Systems Thermal, Simcenter Nastran, or Simcenter 3D Multiphysics as the specified solverFor Simcenter Nastran:Structural as the specified analysis typeSOL 401 Multi-Step Nonlinear or SOL 402 Multi-Step Nonlinear Kinematics as the specified solution typeFor Simcenter 3D Multiphysics:Coupled Thermal-Structural as the specified analysis type and Thermal-Structural (Multi-Step Nonlinear) as the specified solution typeStructural as the specified analysis type and Multi-Step Nonlinear as the specified solution type
Command Finder	Protective Layers
Simulation Navigator	Right-click the Simulation Object Container node→New Simulation Object→Protective Layers

How do I

Create protective layers

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Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

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Protective Layers, Simcenter 3D 2021.1 Series

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