## Description

For CGNS export, the

*Set Solver Attributes* panel provides a file type setting followed by a number of settings to control the polynomial degree of
the exported mesh.

The file type and polynomial degree can be specified for CGNS solver export.

The *CGNS.fileType* attribute can be set to one of the following two options to specify the file type used on export: hdf5 or adf.

The remainder of settings in the *Set Solver Attributes* panel for CGNS are used to set up elevation of the polynomial degree of the exported
grid:

**Note:** High-order polynomial elevation is only available for 3D grids.

**Convergence Cost Threshold:** Sets a maximum threshold value for the minimum curving cost function and stops the smoothing routine
prior to reaching the specified number of smoothing passes if this maximum is reached. *Convergence Cost Threshold* varies from 0.0 to 1.0 and
defaults to 0.8.
**Max Included Angle:** Sets the angle to determine which cells in the mesh will receive smoothing prior to elevation. *Max Included Angle*
varies from 0.0 to 180.0 and defaults to 175.0 degrees. An entry of 180.0 turns off smoothing prior to elevation.
**Polynomial Degree:** Sets the polynomial degree for grid elevation. The default is Q1 or first degree. The mesh can be elevated to
Q2, Q3, or Q4.
**Step Size Relaxation Factor:** Sets the step size to be used when iteratively smoothing the high-order nodes. *Step Size Relaxation Factor*
varies from 0.0 to 0.5 and defaults to 0.05.
**WCNSmoothing Passes:** Sets the number of iterations or steps of the WCN Smoothing routine that will be run for each smoothing pass.
*WCNSmoothing Passes* can be an integer between 0 and 10000 and defaults to 1000.
**WCNWeighting Factor:** Sets a weighting factor which determines the amount that the minimum curving cost function influences the WCN
component. The normalized Jacobian value will be calculated as 1 - *WCNWeighting Factor*. *WCNWeighting Factor* varies from 0.0 to 1.0 and defaults
to 0.5.
**WCNWeighting Factor Mode:** Sets whether *WCNWeighting Factor* is calculated (*Calculate*) or used directly as the value input
(*UseValue*) and described above. *WCNWeighting Factor Mode* defaults to *Calculate*.
**Write HOVTU:** If set to *true*, then a high-order VTK Unstructured (VTU) grid file is exported in addition to CGNS files.
This VTU file can be used with ParaView to visualize P3 and P4 elements. *Write HOVTU* defaults to *false*.