Are you referring to the Transient Run? The steady-state simulation runs for both encountered separate issues. The seawater one just need a simple increase in maximum run time under simulation control. For the 2000 rpm run the log said you canceled it.
If you are referring to the Transient Run which I suspect is the one with the Fatal I/O error, you’re now performing a non-static case? If so, try setting the bounding box walls besides the outlet as Custom with velocity slip and the rest as “set gradient to zero” as for the outlet directly opposite of the inlet, set a pressure outlet with a value of 0 and see if this setup works.
Its a very remote chance that its SimScale’s issue, as most Fatal I/O errors relate to incorrect setups.
Do let me know how it goes.