Surfaces can be meshed with quadrilaterals in ADINA using a "combine/refine" methodology.
- A triangular surface mesh is obtained with the Delaunay mesher considering an interior point placement likely to create good quality quadrilaterals.
- Triangles are combined to create quadrilaterals.
- To eliminate remaining triangles, quadrilaterals and triangles are subdivided into four and three quadrilaterals, respectively.
- The resulting mesh is smoothed.
- Due to the uniform refinement phase, only every other subdivision (on bounding edges) is considered. This requires each edge to have an even number of subdivisions.
- The input sizes must be small enough to allow this "size doubling".
- This quadrilateral meshing methodology is usually acceptable if the input sizes are small enough.
- The ADINA meshing system has another quadrilateral mesher based on the advancing front methodology but it is mixed (triangles will usually remain).
The following images show examples of quadrilateral meshing on surfaces. Please click on thumbnails for larger images.Wheel rim.
Mechanical part (revolved surface).
Other ADINA Mesh Generation Features: