Importing from GMSH stp file fails in meshing

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STEP, STL, AutoCAD-DXF, NASTRAN, ABAQUS, ANSYS, COSMOS, Z88

Moderatoren: ccad, mz15, auroraIco, Lehrstuhl

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datsnl
Newbie
Beiträge: 1
Registriert: Mo 18. Dez 2017, 22:12

Importing from GMSH stp file fails in meshing

Beitrag von datsnl »

Hi,
I am trying to import stp file that was exported from GMSH as stp file.
Importing is good and I can see stl visualisation of the model.

The problem is when I try to mesh it using either netgen or tetgen I get an error "Only one part can be meshed". I checked GMSH for the number of solids in the file and there are only 1.

I am attaching .geo file which is GMSH file, STP file that was exported and the project folder as zip file.

Any help would be much appreciated.

Kind Regards
Dharmit
Dateianhänge
z88-gmsh.zip
(781.67 KiB) 136-mal heruntergeladen
Branch_GMSH.stp.zip
(127.41 KiB) 123-mal heruntergeladen
Branch.geo.zip
(348 Bytes) 141-mal heruntergeladen

FHueter
Support
Beiträge: 13
Registriert: Di 18. Jul 2017, 15:13

Re: Importing from GMSH stp file fails in meshing

Beitrag von FHueter »

Hello datsnl,

the problem is, that your step file holds more than just one part, due to the fact, that some surfaces are included mutiple times.
I attached a fixed version of your stp file.

Kind regards,
FHueter
Dateianhänge
solution.rar
(413.38 KiB) 140-mal heruntergeladen

Flettner
Newbie
Beiträge: 2
Registriert: Mi 16. Okt 2019, 16:06

Re: Importing from GMSH stp file fails in meshing

Beitrag von Flettner »

Hello FHueter,

try to mesh a geometry within z88 facing problems with surfaces included multiple times (... only one part can be meshed). How did you fix the stp-file? I tried to export the model using different formats but with more or less the same result. The only way to mesh successfully is to set the max. elemtsize to a very low level thus get a mesh with a huge elementnumber and running out of memory... .

best regards
Dateianhänge
stl_tetgenLog.zip
(316.38 KiB) 36-mal heruntergeladen
sb04_41_verst_fem.zip
(609.45 KiB) 49-mal heruntergeladen
best regards
Flettner

chgl
Support
Beiträge: 23
Registriert: Di 5. Nov 2013, 15:40

Re: Importing from GMSH stp file fails in meshing

Beitrag von chgl »

Hello Flettner,

your step file contains more than a single part. Therefore, the meshing seems to fail.
We meshed your part with a commercial software, which is able to handle the problem.

We attached the file for import to Z88.

best regards
Dateianhänge
z88structure.zip
(8.28 MiB) 32-mal heruntergeladen

Flettner
Newbie
Beiträge: 2
Registriert: Mi 16. Okt 2019, 16:06

Re: Importing from GMSH stp file fails in meshing

Beitrag von Flettner »

Hello chgl,

first of all thank you for help. How do you recognise that it consist of more than one part and what's the commercial software to handle this?
I'm still interested in how to recognise the number of parts and how to repair broken files. For future studies it is necessary that I'm able to check.

regards
best regards
Flettner

chgl
Support
Beiträge: 23
Registriert: Di 5. Nov 2013, 15:40

Re: Importing from GMSH stp file fails in meshing

Beitrag von chgl »

Hello Flettner,

we used the software abaqus. So we could connect the surfaces.
Overall, it seems to be an export problem. There should be no facets, your part must be exported as a solid. See attached configuration.

best regards
Dateianhänge
prt0001.zip
(2.16 KiB) 26-mal heruntergeladen
Einstellungen.PNG
(11.75 KiB) 466-mal heruntergeladen

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