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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:
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