I would read and try the example problems for impellers. What kind of rotor are you trying to analyze? Is it a propeller or an impeller? Flow simulation can give a decent approximation using the rotating frame approximation for impellers and a bit of a rougher one for a propeller, at least in my experience. A propeller/axial flow turbine for me is defined as a low solidity axial flow lift actuated rotor. An impeller is a high solidity (solid) rotor that turns the flow 90° - it is not typically a lift based device (like a centrifugal pump) but people might argue that one - just to put some sort of references down. So for an impeller you can set pressures and speeds and compute torque and flow rates. On an propeller it gets a bit trickier with the advance ratio. You can typically build a momentum code for a decent approximation. PROP PC by NREL is a good one for wind turbines, that you may have access to. I don't do this sort of thing much and certainly not in awhile but you can make a momentum code with a spreadsheet. I could give you a rough outline if there is any interest (its not that difficult but the tip does present some challenges).
In either case, with flow simulation, you set up the conditions and compute torque over a given set of rotor speeds. Your answer/estimate is lying on that line for a given set of conditions - typically you know something else that defines the actual point. Typically at some maximum where it works best is the target. A free RPM problem is not that useful typically but it is where the rotational drag is equal to the torque.
I would first like to thank you for your time and response, I have done 1 impeller tutorial (is there any others) and I modeled a propeller and did multiple "tutorials" off YouTube, to further gain an understanding/ practice on the flow simulator.
The design is for an Impeller, as it will be contained within a casing/housing system. My intentions was to utilize the radial flow of the fluid (water) induced by the vanes to to make a 360 degree "jet stream" circumferentially & perpendicular to the hosing & impeller.
I would greatly appreciate any and all reference materially you could provide me, such as a spread sheet, I will message you privately with email address.
I have attached some photos of the design, I have designed such part that the "Outlet" can be adjusted (shorter/longer) as needed, the reasoning is that I could utilize the interrupted flow by lengthening or shortening to control the velocity, Low speed= High Torque mentality, and further adjust such length to produce 200 RPM in order to produce desired Turbulence and Cavitation properties. Knowing fluid properties, such as volume flow, pressures, density, dynamic viscosity etc.. with respect to response 'for an impeller you can set pressures and speeds and compute torque and flow rate' would your study be a Transient analysis or Static? From what I understand/ researched, if you wanted to calculate the true RPM of the impeller (or any object) it needs to be Transient, as SolidWorks calculates everything based on the "impeller" being rotated as compared to Static, were the fluid is being rotated around the impeller.
I have attached some photos to further illustrate what I have going on. keeping in mind that this is just the impeller, does not include the housing/casing where it will be seated. All photos have same Inlet and Outlet Locations. I look forward to hearing back from you and thank you once again for your time and advice!
Description/Legend of Design 1
Design 1, Body Transparent, Lids on
Design 1,Body hidden, Channels where fluid flow will occur, Orange highlight is the outermost surface where the fluid will be in conntact
I don't think your geometry lends itself to the rotating frame approximation in Flow Simulation. I would think you need to have a sliding mesh type approximation and yes that would be a transient simulation. To get the rotor RPM you would need a 6 DOF capability in a fluid structure interaction type problem. the other complication is you also have the "small gap problem" between the rotor and the wall. You may want to adopt an experimental approach.