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I am importing a .stl file of a hollow component with multiple openings. I want fluid to flow through the model as if it were a pipe. I have tried different combinations of treating the obstacle as a surface, volume, or both with each resulting in weird behavior. Basically the fluid will not flow through the imported .stl part or the baking process will show no result at all.

Am I missing something for the setup of the scene? I tried recalculating normals which did nothing and the geometry is very simple. Any advice or suggestions would be helpful.

Image of the fluid flowing around the pipe

I'm aware that this shape could easily be made in Blender and did not need to be imported as an .stl however, this is a just a demonstration of the issue that I have. The fluid does not flow through the pipe, despite being directly flowed over its other end. It's like the model is being treated a single solid object, no matter how I define the obstacle (surface, volume, both).

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  • $\begingroup$ Upload your file. We can't really help you unless you include screen shots and or upload a file. $\endgroup$ – 10 Replies Oct 26 '16 at 21:01
  • $\begingroup$ Added an image for clarity of explanation. $\endgroup$ – Joe Kissling Oct 26 '16 at 23:24
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The problem that you are having is that your fluid is not a high enough resolution. Try changing the resolution slider in your fluid physics tab up to 100 or 150.

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  • $\begingroup$ That did it, I had to crank the resolution up to 250 but it solved the issue. Many thanks! $\endgroup$ – Joe Kissling Oct 27 '16 at 0:15

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