Meshing Tutorial 1>ELEMENT-SIZE ASSIGNMENT METHODS  


RJUMP MESHER

The RJump mesher is a surface mesher that meshes patches of surfaces (in 3D space) and is able to skip the inner lines of these patches when meshing. By default, the RJump mesher skips the contact lines between surfaces that are tangent enough, and points between lines that are tangent enough. By selecting MeshDrawSkip entities (Rjump) , the entities that RJump is going to skip and the ones that it is not going to skip are displayed in different colors. In this chapter we will see the properties of this mesher.

RJump default options

Figure 10. Mesh using the RJump mesher.

Note that the smaller elements shown in Figure 3 do not appear in this mesh, because of the properties this mesher.Using the RJump mesher it is possible to assign sizes to different entities. As an example, select MeshUnstructuredSize by chordal error… .

Figure 11. Mesh using the RJump mesher and assigning sizes by chordal error.

Force to mesh some entity

If there is a line or a point that the RJump mesher would usually skip, but that you wish to be meshed, you can specify the entity so that it is not skipped. As an example, we will force Rjump to mesh line number 43, in order to concentrate elements around point number 29, as it was done in chapter 2.2.

Figure 12. Entities that will be skipped and not skipped using the RJump mesher.

Figure 13. Mesh using the RJump mesher, assigning sizes by chordal error and forcing an entity to be meshed.

In this last example we have forced the mesher not to skip an entity, but it may be interesting in some models to allow the mesher only to skip a few entities, meshing almost all or them. In this case, a different surface mesher can be selected (in the Preferences window). One option is the RSurf mesher which meshes everything except the entities that you ask it to skip, using the MeshMesh criteriaSkip command. Here, because RJump is not selected, no entity will be skipped automatically according to tangency with neighboring entities. The next example shows how to work with this mesher.

Figure 14. Mesh using the RSurf mesher, with some lines skipped.


 Meshing Tutorial 1>ELEMENT-SIZE ASSIGNMENT METHODS