So I was going to include a few fans in a flow simulation and the warning written in the title appeared. I tried to troubleshoot by only simulating a free fan in an empty domain, which still gave me the same warning. Now I need some help with how to resolve this.

Below is the fan curve I've inserted into SW where I've marked the working point in the simulation with a red dot.

My entered fan curve at zero pressure is 0.0211389 m3/s.

My working point in the simulation ends up at ~0.0211399 m3/s with a pressure difference of ~17 Pa (measured as the average value of the fans surfaces).

Here is an example of the flow field with a mesh of ~1.3mio autorefined cells:

Im using an internal axial fan with the dimensions and properties provided by the manufacturer in an external flow simulation.

Any ideas of what can be wrong?