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CFD Simulation

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Has anyone tried to do CFD simulation on a design from Fusion 360 ?

I am looking into modifying a fan duct for my 3D printer, and would like to try to simulate the airflow ...
The design can be exported from F360 i step format, and then uploaded to e.g. SimScale ... But I am having difficulties in how to specify inlet and outlet, as it in SimScale seems to be hard to specify these when I have the finished model (and SimScale seems to like "closed" surfaces" ...

Beyond my knowledge, but have you tried posting this question in the Facebook group? Might be able to get more responses there.

Unfortunately no luck after some poking around. Try contacting @dpetsel as he knows how to do this.

idk I have never used SimScale.
If you dont figure it out, you can email or send me the STEP file and I can do it in Flow Simulation in SolidWorks for you if you want.