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idaholab / moose

Multiphysics Object Oriented Simulation Environment
https://www.mooseframework.org
GNU Lesser General Public License v2.1
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Add second order element capability to MeshGenerators #14704

Open dschwen opened 4 years ago

dschwen commented 4 years ago

Reason

For mechanical calculations we frequently require second order elements to avoid locking issues (volumetric and shear locking). Currently there seems to be no easy way to generate second order meshes (with either generators directly supporting second order or as a generator that transforms a first order mesh to a second order mesh)

Design

The low hanging fruit would be a generator that uses the libmesh functionality for turning first order elements into second order elements. Note that this might not result in an optimal geometry as the mid nodes would just be linearly interpolated.

Impact

Capability for second order mesh generation.

YaqiWang commented 4 years ago

Just make you aware this issue: #14476. I was planning to add second_order in mesh generator base class, but got distracted.