MRF-VLM

[Luke Young]

I have read an article about using  openvsp's MRF-VLM(MRF-based quasi- steady VLM) for aerodynamic analysis of propellers. However, this method was not found in any published literature or related materials. It is a method introduced by the OpenVSP team. I am very interested in this method. Could you please tell me how to use it?

[Brandon Litherland]

You can run this mode from the vspaero command line (-quasi option) or via the GUI as Pseudo Steady Rotating mode.  The number of turns is based on the Num It. rather than the number of revolutions specified in the Propeller tab.  Try changing RPM and blade angle of the vspaero_ex prop.vsp3 and compare fully unsteady and quasi-unsteady modes to see the differences.  Computation speed is much faster for quasi-unsteady but you may be missing out on time-accurate effects.