Do you have a rotating region? If so, how close is the rotating region to the inlet or outlet?
Keep in mind that rotating regions make a very important assumption that pressure is constant circumferentially around the rotating region and this could be what's causing the error.
based on your screenshot, it looks like you aren't following the recommendations from the solving eng problems doc. I would expect it to be "sunk" into the walls with stators applied
I made the some changes in the rotating region. I have kept rotating region only between the two walls. Rest faces of impeller I defined it as rotating wall and refined the mesh. It got solved without giving any error.
Below are the results which I have got:
SG Av Static Pressure 1: [Pa] -1022579.18
SG Volume Flow Rate 1: [m^3/h] 30.0000
SG Av Static Pressure 2: [Pa] 101325.00
SG Volume Flow Rate 2: [m^3/h] -32.7014
SG Torque (X) 1: [N*m] -64.490
As per the experimental result For flow rate of 30 m^3/h, the head should be 130 m.
Here the pressure difference and torque value is high. Also the volume flow rate at outet is little higher than the inlet flow rate.
Let me know your feedback on this and any suggestions to get the required output.
what does mass flow rate look like?
would recommend you do a search on this topic in the forum as it has come up often in the last little while.
some stuff that you will see that is consistent is recommendations to review the recommendations in the solving eng problems doc and the solidworks kb with respect to rotating regions. it sounds like you are following some of them but the error you describe is very commonly associated with bad geometry and/or bad setup.
heres a starter in geometry clean up http://www.hawkridgesys.com/blog/flow-simulation-4-starting-flow-simulation-analysis/