I recommend you to try modifying the TimeScale value (In "Solver-Control" option) and check it. I am attaching a best practice tutorial file regarding pump in cfx. Please refer to these links for appropriately setting up the case.
(60) ANSYS CFX: Design and Analysis of a Pump Impeller - Part 1 - YouTube
(60) ANSYS CFX: Design and Analysis of a Pump Impeller - Part 2 - YouTube
Hope this solves your problem.
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