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[Mohammad Raihan Arfin]

Hi,

I am trying to mesh the attached geometry which is a microchannel with gyroid infilled. This geometry was first created in ntopology as two parts consisting the fluid domain (channel) and wall, later both were exported as a stl mesh into spaceclaim using assembly option as shown in the figure attached. The assembled geometry consisted of two facets, the channel facet (described as fluid) and the outer wall facet (described as solid). When I try to import the spaceclaim file into wrokbench, the geometry is updated well but when the meshing is done then it fails displaying the error message that 'the mesh generation didn't complete due to poor quality'. I came accros a few threads with similar problems and they were advised to look into the dimension and element size. The dimension of my channel is 50*0.5*0.5 mm and outer wall is 50*0.6*0.6 mm (l*b*h), and I tried different element sizes from 10e-3 to 10e-9, but it fails everytime.   

Also, since the parts were imported as stl mesh into spaceclaim and later into workbench, defining the named selection for non-uniform channel shape is not happening. Kindly look into this people. Thanks in advance.

 

 

 

[Aniket]

you will first need to clean the geometry in SpaceClaim. For that try and convert the facets to 3D before importing to workbench. Also, I would suggest extracting the fluid volume in SpaceClaim itself instead of first using SpaceClaim for solid and then taking it to Designmodeler to avoid any transfer losses.

check out videos similar to this: 

https://www.youtube.com/watch?v=aJIDzC9F5E0

-Aniket

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[Mohammad Raihan Arfin]

Thanks for the reply. Are you asking to convert to facets to solid body in spaceclaim, I tried that but it leads to very messy surface body instead and upon repairing and smoothening it fails. 

[Aniket]

That could be the exact reason for failure. The quality of stl data might not be adequate to create clear solid, so before using convert facets to the solid body you will need to use STL cleanup tools available in SpaceClaim, which is not only soothing but there are multiple tools such as, check facets, auto fix etc.

-Aniket

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[Mohammad Raihan Arfin]

I tried to first clean up the stl file using the tools like auto fix, smooth, and repairing tools like stiching, missing faces, gaps etc. Many of the errors could be solved but many weren't stating 'tas9k could not be completed'. Somehow I managed to convert it into surface patch body and then upon few simplifications to a solid body, however, the solid body appears to have very irregular faces, where I also tried to merge a few faces and apply few cleaning tools and then tried to mesh it in fluent, but the surface mesh doesn't progress beyond 65% and continues in operation without progress for hours. I tried to mesh it in workbench also, but here also, the meshing doesn't progress for hours. I am attaching here the screenshots for the converted solid body and another cleaned up facets which somehow doesn't convert into solid and doesn't even show any missing gaps or faces to fix.

 

[Aniket]

I would suggest the following steps:

1. Clean the STL and fix it as much as possible in SpacClaim
2. Use Reverse engineering tools in the Tools ribbon bar to recreate surfaces that are not fixed by tools from Facets ribbon bar
3. convert to solid without merging the surfaces
4. take the model to Mesher and use virtual topology to merge the surfaces.

-Aniket

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