Using mesh diagnostics to assess section data quality
The newly introduced mesh diagnostics data file was introduced to improve the debug process for mesh generation. In this first article, the leading and trailing edge data will be introduced and we'll show how it can be used to assess the quality of airfoil sections coming into WAND.
The easiest way to find the leading and trailing edge data is to search for the phrase "START: LETE DATA" in a text editor. It should locate a section that looks similar to what is shown below.
- K: Section Number
- NBNEW: Number of points in a section
- IXMN: I-index of the leading edge point
- LETE: LETE option specified in the .AGF file
- ITYY: Input format specified in the .AGF file
- LERAD: Calculated leading edge radius
- TERAD: Calculated trailing edge radius
- XatIXMN: X-coordinate of leading edge point
- RatIXMN: R-coordinate of leading edge point
In WAND, leading edge location are calculated by the locations of maximum curvature so examining the location and radius of the leading edge and the radius of the trailing edge, we can learn about the quality of the incoming airfoil section. In this example, a defect has been introduced into one of the sections of the Row1X sample case resulting in negative volumes in the mesh. The first step in using this data will be to plot the distributions of LERAD and TERAD.