PO 6.2.9

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9.1. Create Mesh

In the PO module, the mesh generation is a required step that is performed immediately before simulating. In the Meshing Parameters window, represented in the next Figure, the following options are available: 

Meshing Parameters panel


In the Meshing Options panel the following options are available:

·         Number of processors. To set the number of processors for the meshing process.

·         Meshing Strategy:

o   Regular Meshing. The size of the generated elements is selected by the user. Regular meshing is the common algorithm used in other modules such as MOM. It provides a mesh of triangles of similar sizes with a distribution as uniform as possible. It enables the user to set the exact size edge of the triangles to be generated, given in lambda units. However, a huge number of mesh elements may results when the geometry contains large surfaces.

§  Multilevel.Use Multilevel to generate the mesh automatically in several sequenced steps. This option is usually more efficient (in terms of runtime) than the common mesh generation option, so it is selected by default. However, there may be minor differences between the meshes obtained with and without the Multilevel mode. 

§  Edge size. The desired size for the edge of the elements, in wavelengths.

o   Curvature Meshing. The size of the generated elements is automatically computed in the meshing progress. However, it depends on the global bounding box of the targets, their curvatures, and the Distance error and Surface error (lambda) parameters. This technique provides a non-regular mesh with patches generated to discretize the curvatures and edges of the geometry with a quasi-adaptive method. The generated meshes usually are less dense than the ones provided with the Regular Meshing strategy. The curvature meshing has been developed with the aim of solving the limitations that uniform meshes may cause in PO and GTD-PO modules. By using this technique, the planar surfaces are discretized with the minimum number of triangles that is possible; and the curved surfaces are discretized in a set of flat triangles. The criterion of curvature meshing converts the curved surfaces in planar triangles meshes where the maximum deviation between any planar triangle and the original surfaces is lower than the wavelength multiplied by the Surface Error factor.

§  Distance error: increasing this parameter creates a denser mesh in planar surfaces (smaller size of elements).

§  Surface error (lambda): decreasing this parameter creates a denser mesh in curved surfaces (smaller size of elements).

The table below shows a comparison of meshing criterions with a different configuration for meshing a cylinder with a radius of 0.25 m. and height of 1 m. at 3 GHz.


1 lambda

0.5 lambda

0.01 lambda


0.2 surface error

0.1 surface error

0.01 surface error


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