Hi.
I would like to know how to force GiD to mesh axisymmetric problems with hexahedra elements. I am getting a message saying that this is not possible for unstructured volumes, but I know GiD can build it.
Axisymmetric problems with hexahedra
Moderator: GiD Team
Re: Axisymmetric problems with hexahedra
Apart of the 'axisymmetric' adjective,
hexahedra unstructured meshes cannot be generated by GiD
must be structured (topologically a 6-faces cube)
or semi-structured (topologically a surface of arbitrary faces, extruded along a direction)
In this case 'axisymmetric', I guess that do you want a revolution mesh, then can do a semi-structured one, the extrusion direction is the revolution circumference.
hexahedra unstructured meshes cannot be generated by GiD
must be structured (topologically a 6-faces cube)
or semi-structured (topologically a surface of arbitrary faces, extruded along a direction)
In this case 'axisymmetric', I guess that do you want a revolution mesh, then can do a semi-structured one, the extrusion direction is the revolution circumference.
Re: Axisymmetric problems with hexahedra
OK.
I was able to generate a mesh by a semi-structured volume. I have searched by a revolution mesh, but didn't find. How can I do a mesh symmetrical with respect to a axis?
I was able to generate a mesh by a semi-structured volume. I have searched by a revolution mesh, but didn't find. How can I do a mesh symmetrical with respect to a axis?
Re: Axisymmetric problems with hexahedra
Can create a geometry or a mesh of revolution, with the Utilities->Copy window...
It the mesh is not enough 'symmetric' meshing a geometry created by revolution
the can do of copy directly in mesh: first create the 2D surface mesh (triangles or quadrilaterals) and then do a copy of these elements by revolution around an axis (defined by two coordinates in 3D, one in 2D) and with extrusion of elements to create prisms/hexahedra. Set a small degree and multiple copies, e.g. angle=15.0 degrees and copies=24 to fit the 360 degrees
At the end can delete the elements of surface, probably do you only want the elements of volume extruded
But it is unrecommended to work directly in mesh, it is better if possible do a geometry, assign groups, conditions, materials, layers and then generate the mesh.
It is usually more difficult the direct selection in mesh.
It the mesh is not enough 'symmetric' meshing a geometry created by revolution
the can do of copy directly in mesh: first create the 2D surface mesh (triangles or quadrilaterals) and then do a copy of these elements by revolution around an axis (defined by two coordinates in 3D, one in 2D) and with extrusion of elements to create prisms/hexahedra. Set a small degree and multiple copies, e.g. angle=15.0 degrees and copies=24 to fit the 360 degrees
At the end can delete the elements of surface, probably do you only want the elements of volume extruded
But it is unrecommended to work directly in mesh, it is better if possible do a geometry, assign groups, conditions, materials, layers and then generate the mesh.
It is usually more difficult the direct selection in mesh.