Learning Forum

[audrys]

Hello,

I am working on a heat dissipation analysis for a complex heatsink geometry and have been encountering a series of issues importing and meshing a model that contains convergent bodies originating from NX 2027. I wanted to document the full issue chain here in case others have encountered similar problems and to ask for guidance on the best path forward.

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SOFTWARE VERSIONS:
- NX 2027
- ANSYS 2025 (Electronics Desktop / Workbench)
- Fluent Meshing (Watertight Geometry Workflow)

BACKGROUND:
The geometry was created in NX 2027 and contains convergent bodies. The goal is to perform a heat transfer analysis on a complex heatsink in Fluent/Icepack.

ISSUES ENCOUNTERED:

1. Parasolid Text Export (.x_t) blocked with error:
"Cannot export Convergent bodies as text files. Please export Convergent bodies as binary."

2. Parasolid Binary Export (.x_b) succeeded but imported into AEDT as an empty/invisible body with no geometry present.

3. Brought geometry into Workbench via direct .prt import. Opened in SpaceClaim where the convergent body appears as a Facets body type in the Structure tree, alongside a solid Enclosure body created in SpaceClaim.

4. In Fluent Meshing Watertight Geometry Workflow, Generate Surface Mesh fails with:
"Cannot merge zones of different types or belonging to different objects."
It seems like this is caused by the heatsink being a Facets/mesh body type while the enclosure is a standard solid body

Here's what I've tried so far:  

- Exporting as STEP from NX — geometry incomplete, some features not captured
- Exporting as Parasolid binary — imports as empty geometry in AEDT
- SpaceClaim Repair tools — no STEP or Parasolid export available in current license

 

QUESTIONS:

1. Is there a way to handle mixed Facets/Solid geometry in the Fluent Meshing Watertight Geometry workflow, or is Fault Tolerant Meshing the correct workflow for this situation?
2. Is there a recommended workflow for bringing NX 2027 convergent body geometry into Fluent/Icepack for analysis?

Any guidance would be greatly appreciated. Thank you.

[Anilkumar]

Hi,

I am not clear about NX 2027 version, can you confirm on this? For Ansys 2025R2 version you need to work with any of the below NX versions in Plug-in mode (NX2312, 2406, 2412, 2506) or as reader you can have NX2412 to directly import the NX part files within Ansys SpaceClaim/Discovery or Fluent Meshing.

If you have mixed type of bodies, like facetted one and normal bspline CAD then FTM would be prefferd to get you internal cavity extracted with material point, since you will not be able to perform share topology on such mixed type bodies withn SpaceClaim.

Hope this helps you.

Thank you!

Anil