Hello Klara
It looks like there is some issue while solving the case with highest fidelity. When I reran the case1, this time I got reasonable results, but the velocity contours were all red.
When I tried running the same case with default fidelity, I got expected results for pipe length upto 10m. See below snapshot.
Can you try running the cases with default fidelity and let me know how it goes?
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