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...es/tensor_mechanics/doc/content/modules/tensor_mechanics/examples/iga_cframe.md
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| # Isogeometric Analysis in MOOSE | ||
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| This example illustrates using [!ac](IGA) within MOOSE framework to perform a simulation. This example simulates | ||
| loads applied to a "c-frame" to determine the maximum principal stress. | ||
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| ## Creating IGA Mesh | ||
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| To create the mesh file included int this example a Coreform Cubit license is needed. | ||
| Coreform Cubit is a product released and maintained by Coreform, LLC. | ||
| A free to use [Cubit Learn license](https://coreform.com/products/coreform-cubit/free-meshing-software/) can be acquired. | ||
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| !alert! note title=Mesh Generation with Cubit | ||
| The following is not required to run the example, but is required to | ||
| generate the input mesh that is included in the example. To execute | ||
| the Cubit journal file in batch from the command line use the | ||
| following command: | ||
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| ``` | ||
| coreform_cubit -batch cframe_build.jou | ||
| ``` | ||
| !alert-end! | ||
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| Within the journal file, see [!ref](cframe_jou), there are unique commands that will generate a uspline on the discretized mesh. | ||
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| - Line 35 sets the degree and continuity of the uspline | ||
| - As of this writing, the max degree supported by libmesh is 2. | ||
| - All continuity must equal p-1 where p is the degree. | ||
| - Line 36 constructs the uspline using the geometry as a basis. | ||
| - Line 37 fits the uspline that was built to the geometry. | ||
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| !listing examples/cframe_iga/cframe_build.jou id=cframe_jou caption=Complete Coreform Cubit file for generating [!ac](IGA) input mesh | ||
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| ## MOOSE-IGA Simulation | ||
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| Performing the simulation utilizing the mesh created above does not require much with respect to the MOOSE input, simply | ||
| load the mesh from a file and select utilize the RATIONAL_BERNSTEIN element family as shown in [!ref](moose-iga-input). | ||
| Exporting using the VTK format (`vtk = true`) input will output in a format that will capture the higher-order nature | ||
| of the [!ac](IGA) based elements using Paraview visualization. | ||
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| !listing examples/cframe_iga/cframe_iga.i id=moose-iga-input caption=Complete input file for running example problem with [!ac](IGA) in MOOSE. | ||
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| !media tensor_mechanics/cframe_iga.png id=moose-iga-vtk caption=Maximum principal stress for "c-frame" example utilizing [!ac](IGA) in MOOSE. |
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modules/tensor_mechanics/examples/cframe_iga/gold/cframe_iga_out_001.pvtu
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| <?xml version="1.0"?> | ||
| <VTKFile type="PUnstructuredGrid" version="0.1" byte_order="LittleEndian" header_type="UInt32" compressor="vtkZLibDataCompressor"> | ||
| <PUnstructuredGrid GhostLevel="1"> | ||
| <PPointData RationalWeights="RationalWeights"> | ||
| <PDataArray type="Float64" Name="RationalWeights"/> | ||
| <PDataArray type="Float64" Name="von_mises"/> | ||
| <PDataArray type="Float64" Name="Max_Princ"/> | ||
| <PDataArray type="Float64" Name="stress_xx"/> | ||
| <PDataArray type="Float64" Name="stress_yy"/> | ||
| <PDataArray type="Float64" Name="stress_zz"/> | ||
| <PDataArray type="Float64" Name="disp_x"/> | ||
| <PDataArray type="Float64" Name="disp_y"/> | ||
| <PDataArray type="Float64" Name="disp_z"/> | ||
| </PPointData> | ||
| <PCellData> | ||
| <PDataArray type="Int32" Name="libmesh_elem_id"/> | ||
| <PDataArray type="Int32" Name="subdomain_id"/> | ||
| <PDataArray type="Int32" Name="processor_id"/> | ||
| </PCellData> | ||
| <PPoints> | ||
| <PDataArray type="Float64" Name="Points" NumberOfComponents="3"/> | ||
| </PPoints> | ||
| <Piece Source="cframe_iga_out_001_0.vtu"/> | ||
| </PUnstructuredGrid> | ||
| </VTKFile> |
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