Error Quality Tri Generated

Coreform Cubit Meshing
#1

Hello, please your help with this issue, during meshing surfaces:

I used:
trimesher surface gradation {bias_factor}
mesh surface all
surface all smooth scheme condition number beta 1.4 cpu 10

to smooth a mesh with {dx=50*m}, then a Warning appeared:

WARNING: >>>> Poor Quality Tri Generated!<<<< on Surface 2 (conmantle)
(For example, the Shape metric for Tri 54575 is 0.122809.)
The threshold for a Tri is 2.0

Thanks.

#2

Note that this is a warning not an error. There were some triangles that are not ideally shaped. This is normal with most real-world geometries. However, the shape metric is still positive and will not create an error condition in the analysis code.

You can use the Quality tools in Cubit to locate the elements and determine if they are in an area of critical interest.

1 Like
#3

Thanks a lot.

But now, unfortunately, I get an ERORR

ERROR: /home/r…/mesh_tri3.jou (66). Malformed element (Shape = 0.000000): Tri 26938 owned by oceancrust
ERROR: /home/…/mesh_tri3.jou (66). >>>>Negative Jacobian Tri Generated!<<<< on Surface 3 ( oceancrust )
(For example, the Shape metric for Tri 26938 is 0 .)
The threshold for a Tri is 0.2

I used:
trimesher surface gradation {bias_factor}
mesh surface all
surface all smooth scheme condition number beta 1.4 cpu 10
to smooth a mesh with {dx=25*m}, then a Warning appeared:

Please you help.

#4

My guess here is that you are meshing facet based geometry from an STL file or some other facet based format. You may have sliver surfaces that can cause these kinds of problems. You can try compositing surfaces, but Cubit is not the best tool to clean up facet based geometry. You may want to try a tool like blender to clean up the facets.