ElastoDyn number of blades

[peterfakhry]

Hello there, i have three questions. Can ElastoDyn solve for all the three blades instead of just the first one because BeamDyn needs a very small sampling time to converge. The second question what is the distance x shown in the figure defined in the FAST files. Third question why always the in plane deflection of blade is plotted in the -ve direction?
Thank you

[jjonkman]

Dear @peterfakhry,

Here are my answers to your questions:

1. Yes, ElastoDyn can be used to model wind turbines with 1, 2, or 3 blades through input NumBl.

2. In ElastoDyn, the blade tip to tower-centerline clearance in the undeflected condition when the blade is pointing downward can be computed as: ABS( OverHang*COS(ShftTilt) + TipRad*SIN(ShftTilt+PreCone) )
3. ElastoDyn uses the IEC-style coordinate system where the y-axis of the blade coordinate system points towards the trailing edge at the zero-twist blade station.

Best regards,

[peterfakhry]

thank you sir for this clarification. Regarding the first question, i mean i only get the response of the first blade in the .out file however i want the three blades response
thank you

[jjonkman]

You can include outputs from all three blades in the OutList at the bottom of the ElastoDyn input file.

Best regards,

[peterfakhry]

Thanks a lot Professor