I am trying to mesh an airplane made up of surfaces and some of the elements have round shapes whereas others are more rectangular. In order to save meshing elements I am trying to apply specific chordal errors only in certain parts whereas other might go with default values. I try to use the option assign entities, however, no matter how much I try I am not seem to be able to apply specific NURBS surfaces.
Is there a way to do this, I have been reading the courses but I cannot find this case. If this is not possible, is there any alternative?
What is the “assign entities” option for?
Thanks a lot,
Juan
The ‘desired mesh size’ is a single real value that can be assigned to each entity.
A single surface can be have a size value, if it has a curved shape in a small region is not possible to assign size to this region, consider divide the surface in direction u or v near the strong change of curvature, and then can assign size independently to each surface.
Assign “Sizes by chordal” assign automatically sizes to all entities based on its curvature.
and Mesh->Unstructured->Assign entities allow to mark the entity to be ‘unstructured’ without any specific user size (it is a rare option used for example to remove a structured number of divisions previously assigned)
Can divide a parametric surface in parametric directions u or v with
Geometry->Edit->Divide->Surfaces
Num divisions: set the amount of divisions in u or v direction (equi-spaced intervals in space of parameters)
Near point: divide in u or v, pick the (u,v) space coordinate mapping a near 3D space point in the surface
Parameter: divide in u or v, you specify the surface parameter value (from 0.0 to 1.0)