combine curve crashes trelis

Coreform Cubit Meshing
#1

I import a facet file of a surface into trelis. Trelis identifies 3 curves on the boundary of the surface. I try to combine the three curves into 1 and trelis crashes.
Here is the facet file:
dropbox.com/s/ut5la2f16tse4 … facet?dl=0

My goal is to create a solid surface from this facet surface.
But meshing results in Negative jacobian and I think it is due to the bounding curves. So I am trying to get one closed bounding curve which I will mesh and then hope to get a map mesh on the surface.

#2

When imported, there are two surfaces. Is this correct?

I don’t see the same problem with the bounding curves. Here’s what I tried:

reset
import facets “C:\v2_H_PAI_HW.facet” merge
mesh surf all
quality surf all scaled jacobian global draw mesh

(file attached)

No negative jacobians and the scaled jacobian quality metric shows only one element under .373

Did I understand your question correctly?
v2_H_PAI_HW.facet (95.8 KB)
quadmesh.cub (457 KB)

#3

I forgot to mention, I need a tetmesh in the volume so I used trimesh on the surface.

#4

You could use the “Make Element” option when importing to get a trimesh on the surfaces.

#5

The triangular elements in the facet file are not useful for meshing. They are arbitrary, highly distorted and will not be lead to a good mesh for flow simulation. I am using the facet file because that was the version exported by another software that trelis can read.

#6

You may not need to convert the model to ACIS to get a good tet mesh. Try these commands. I get really high quality elements, except for a single tri on what was surface 3, which is still pretty good quality.

reset
import facets “v2_H_PAI_FW.facet” feature_angle 135.00 merge stitch
composite create surface all keep angle 15
vol all scheme tetmesh
vol 1 size 500
set volume proximity layers off
set geometry approximation angle 15
set surface gradation minimum 1.3
set volume gradation minimum 1.3
set volume gradation minimum 1.3
mesh surface 5
quality surface all shape global draw mesh

Will this work for you?

#7

I get errors on using “proximity,” “approximation”. Probably due to my 15.0 version. I have a Trelis license. Where can I get the latest version installer for Mac64?

Trelis>set volume proximity layers off
Parser unable to match Keyword Identifier ‘proximity’

   Possible matches:
     'proximity_2d'
     'proximity_3d'

Added input specification is required
ERROR:
Unrecognized Identifier: ‘proximity’
Trelis>set geometry approximation angle 15
ERROR:
Unrecognized Identifier: ‘approximation’
ERROR:
syntax error (, line 129)

#8

I believe the download is in your csimsoft account under My Downloads.