C N
Ansys Employee

Hello Domink,

I recommend you to check the alignment of the fan on global axis and also your inlet velocity choice. May be due to range of data being out of range can lead to these warnings. So I would recommend you a workaround in order to simulate the similar characteristics by using the user defined fan model at your desired location. I am attaching you the user guide link on how to implement this . Please follow this and there is an example too . 

7.8. User-Defined Fan Model (ansys.com)

refer 7.8.1 and 7.8.2 

This should solve your problem.

Thanks,

Chaitanya Natraj