Description

When exporting a high-order (H-O) mesh, the Export CAE panel (shown below) is modified slightly to provide feedback on the smoothing and elevation process. Note that due to the nature of polynomial elevation, producing a high-order mesh can be a lengthy process for larger grids.

 

Caution: Due to the nature of polynomial elevation, producing a high-order mesh can be a lengthy process for larger grids.

High-Order Mesh Export
The Export CAE panel changes when exporting a high-order mesh.

The elevation process consists of two primary phases: the WCN Smoothing phase and the curving phase. The curving phase itself usually includes two sub-phases, but may have as many as four.

As the elevation process proceeds, the minimum curving cost value factor, QMin, should be positive and the closer it approaches 1 the better. Monitoring QMin with each iteration provides you with feedback on the appropriateness of the inputs set in CAE, Set Solver Attributes. For example, oscillation that may appear in the minimum curving cost value factor can be indicative of a Step Size Relaxation Factor that is too large. One active control, Stop Smoothing Pass, is provided to halt the smoothing process. The stop sign icon present in the progress bar area of the Status Bar can be used to halt the elevation process.

 

Note: Note that solver attributes, including polynomial degree elevation, are available in CAE, Set Solver Attributes for CAE formats that support high-order export.

When exporting a high-order mesh, please note the following:

  • The elevation process matches high-order nodes across periodic boundary pairs.
  • Elevation of non-planar boundaries differs based on whether the domain is database constrained or not. If the domain is database constrained, the high-order nodes are placed on the underlying database. However, if the domain is free, the high-order nodes are positioned using linear interpolation.
  • Constrained and unconstrained boundary
              elevation.
    The high-order nodes are placed on the underlying database (shown in blue) or, if the domain is free, using linear interpolation (shown in red).
  • The elevation process does not currently support domains that are part of baffles or are not fully constrained on their interior. The elevation process will be aborted and an error will be issued if either of these types of domains are detected
  • An error message is printed out in the Display window if the elevation process detects a baffle domain (left) or a domain that is not fully constrained on its interior (right).

High-Order CAE Formats

High-order export is currently supported for the following CAE formats:

 

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

Demonstration

High-Order Mesh Setup

High-Order Mesh Export