@Retsam , [hfhf] I am currently running a similation on Savonius Wind Turbine and I am stuck at setting this. Can anyone tell me what to input for this section please? :confused:

Project link: https://www.simscale.com/workbench/?pid=2398422425530125374&mi=spec%3Af65c634f-f36b-4016-a1ca-984ee1b69d2f%2Cservice%3ASIMULATION%2Cstrategy%3A1&ps=analysis%2FIncompressible--oneOf%2FadvancedConcepts%2FrotatingZones%2F0

I think you are close with (0,0.5,0) for the axis in the current parameters for the sim (EDIT: the runs you did were wrong at (0,0,1), but perhaps the vector magnitude of the Axis needs to be normalized to 1 , like the directions in the directions for the Coefficients results need to be (that is a …

@tedmund , see my edited post above, your runs that had (0,0,1) for axis were wrong… And of course ‘Rotation velocity’ should have its ‘sign’ set to right hand rule on (0,1,0). I can never remember if that direction is with respect to the desired rotation of the geometry or of the air in the MR…

Yes it is possible! After you get the answer to my query, if axis (0,1,0) ends up needing a -ve rotational velocity and you just can’t wrap your brain around that, then put axis to (0,-1,0) and set rotational velocity to +ve :wink: This is a common issue and the User interface and help text boxes …

I think the rotational velocity should be set with respect to the desire rotational motion of the wind turbine

Therefore, a negative is needed for clockwise rotation!

Sir, thank you so much for spending time on solving my doubts! I really appreciate your effort!

I would like to precise few points, as vague ideas are counter productive and it is better to avoid them. For MRF rotation direction, use ‘RIGHT HAND’ rule ‘RIGHT THUMB’ rule. When your thumb points in Axis direction, other fingers show rotation direction. (Assuming your specify positive rotatio…

SimScale CAE Forum

What values to input for Axis, Origin and Rotational Velocity parameters when using an MRF rotation zone

Using SimScale Fluid Flow / CFD

tedmund October 3, 2019, 2:03pm 5

You mean the rotational velocity should be negative?