[MBDyn-users] Simulation of NREL 5MW wind turbine

MBDyn users list mbdyn-users at mbdyn.org
Tue Jul 23 16:36:56 CEST 2019

One thing to note, not every MBDyn element is yet exposed in the
toolbox. For example none of the aerodynamic elements are yet available.
However, they would be easy to implement if you want some particular
elements, and I will probably do it if you ask.



On 23/07/2019 15:32, MBDyn users list wrote:
> Pierangelo, Richard,
> Thank you for your advice. I will have a try using the mbdyn-matlab-toolbox.
> Best wishes,
> Jun
>> On 7/23/19 06:44, MBDyn users list wrote:
>>> Dear all,
>>> I'm running the example NREL 5MW wind turbine given by the MBDyn
>>> website.
>>> I noticed that the constitutive properties and the stiffness matrix
>>> of every beam section at different locations of a blade are different.
>> In such a twisted and tapered blade, it is expected that geometric,
>> structural, and aerodynamic properties significantly vary along the span.
>>> Is it accurate enough to use 5 or 10 3-node beam elements and the
>>> constitutive properties of the corresponding Gauss points to simulate
>>> a blade?
>> A numerical model is by definition an approximation of reality.  In
>> principle, the quality of the simulation is a trade-off between such
>> approximations and the amount of resources you can commit to solving
>> the problem.  So any level of mesh detail may be considered
>> appropriate, depending on where you find such trade-off suitable
>> according to your needs and resources.  In practice, you'll notice
>> that some indicators (e.g. static deflections, natural frequencies up
>> to some order, and so on) converge with a certain level of mesh
>> refinement.  In our experience (mainly in helicopter rotors, but also
>> a bit with wind turbines) 4 or 5 three-node beam elements give
>> appreciable convergence for moderately variable properties in terms of
>> natural frequencies; even less suffice in terms of static
>> deflections.  In practice, we seldom had to use more than 20 beam
>> elements; when we used more, it was merely to generate challenging
>> models, e.g. for performance benchmarking.
>>> Another question is how to generatesimilar input files of a wind turbine.
>> Usually by writing a script (octave/matlab, python, or even shell)
>> that generates the model.   You can find some support in
>> contrib/PythonPreprocessor/.  There is no ultimate catchall script
>> provided, since in my experience I seldom found problems and data
>> documented exactly in the same manner, so some adaptation has always
>> been required.  A standardization in this area would be more than welcome.
>> Sincerely, p.
>>> Many thanks and kind regards,
>>> Jun
>>> _______________________________________________
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>> --
>> Pierangelo Masarati
>> Professore Ordinario di Costruzioni e Strutture Aerospaziali
>> Dipartimento di Scienze e Tecnologie Aerospaziali
>> Politecnico di Milano
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