Triangular Surface Meshing

Surfaces can be triangulated in ADINA using either an advancing front or a Delaunay surface mesher.

Advancing Front

  • A standard 2D advancing front algorithm is applied in parameter space.
  • Actual distances are obtained from the surface first fundamental form.
  • Sizes are controlled by a quadtree built in parameter space.
  • Elements are created considering a minimum quality threshold, which can be repeatedly relaxed if the algorithm does not converge.
  • There is no optimization or smoothing applied to the obtained mesh.

Delaunay

  • A standard 2D Delaunay insertion algorithm is applied in parameter space.
  • Sizes are controlled using interpolation on the current mesh.
  • Resulting mesh is optimized and smoothed.

Remarks

  • The advancing front surface mesher is fast, robust (in its ability to generate a mesh for a given surface), and it creates high quality meshes.
  • The Delaunay mesher is probably more robust (in the rare cases the advancing front mesher fails to produce a mesh) but is, at the time being, slower (see timings below). This is not of high concern since the time required to mesh surfaces still represents a small percentage of the total time to mesh a body.
  • The Delaunay methodology is employed mostly for special purposes like quadrilateral meshing, anisotropic meshing, curvature-based refinement, and mesh adaptation.

Please click on thumbnails for larger image.

Mechanical part (advancing front).
Mechanical part (Delaunay).

This is a model with mostly primitive surfaces.


Turbine impeller (advancing front).
Turbine impeller (Delaunay).

This is a model with lofted surfaces.



Other ADINA Mesh Generation Features:

Triangular Surface Meshing Quadrilateral Surface Meshing
Mapped Meshing Tetrahedral Meshing Mesh Adaptation-Repair
Anisotropic Meshing Automatic Grading Curvature-based Meshing

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