Dear Development Team,
I would like to ask how to set the upper and lower surfaces of the flow channel as temperature walls while keeping the other surfaces as insulated walls. Thank you.
mfix-25.3
As shown by the red surfaces in the diagram.
You would need to split the STL file into several files, one for each different BC. There is an option to filter STL facets by normal orientation in the GUI, but that would not work with the bends. It is probably best to split the STL file with the software you used to create it.
No doubt that this is a good method. Thank you!
Additionally, Could you tell me where is the function about ”filter STL facets by normal orientation in the GUI”
Of course, I can use other software split this STL. However, when I imported the split STLs into mfix, their positions overlapped, making it difficult to combine them at the corresponding positions. I mean that it’s very difficult to precisely locate and connect them together. Could you give me more help, Thanks a lot.
This is done when setting up Regions:
I still recommend you split the STL geometry outside the GUI as it won’t be straightforward with your geometry. If you split the STL file, there shouldn’t be overlap. You would have one STL file for the upper wall, one for the lower wall, and another one for everything else. Then you create a different region for each STL file.
Thank you, I have a try.
I tried. I divided it into the upper entity and the lower entity, and the boundary can be defined now. However, there is a new problem: an extra coupling surface at the contact point between the upper and lower entities will lead to the failure of meshing. I don’t know how to solve it?
What do you mean by coupling interface, is there an internal wall? The upper and lower bodies are not closed bodies, think of them as surfaces. I don’t know what CAD software you use to generate the STL, but there must be a way to select a surface and delete it.
You should export as surface not solid in this case, and remove the “interface” perhaps manually. It would probably be easier if you also model or convert your model into surface bodies, not solids.
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Yes. it comes true. Thank you!
OK, you suggestion has taken effect, thanks.
Out of curiosity, what CAD software is used?
Solidworks software. Haha.