Open Access Open Access  Restricted Access Subscription or Fee Access

Aeroelastic Analysis for Side-Booms of a Coplanar Twin-Rotor Wind Turbine

Amr Ismaiel(1*), Shigeo Yoshida(2)

(1) Faculty of Engineering and Technology, Future University in Egypt, Egypt
(2) Research Institute for Applied Mechanics, Kyushu University, Japan
(*) Corresponding author



As an extension to a previous research made by the authors, this paper represents an aeroelastic analysis for the side-booms supporting the two rotors of a coplanar twin-rotor wind turbine. For a better understanding of the turbine dynamic behavior, the inhouse aeroelastic tool developed by the authors, which is considered as the first approach to study the aeroelasticity of multi-rotor wind turbines, has been extended to model the side-booms and compare three different configurations of the boom size during the analysis. The model is based on deterministic models, where aerodynamic loads are calculated using blade element momentum theory, and virtual work method with a modal approach is used for structure analysis. The three configurations of the side-booms have three different diameters while all other geometrical parameters are kept constant. The bigger the boom diameter, the higher the bending stiffness becomes. It was found that the weight of the rotor is dominant over the fluctuating aerodynamic loads in the in-plane direction, while the deflection is highly affected by the turbulence in the out-of-plane direction. It was also found that the relation between the stiffness and the mean side-boom deflection is of second order, hence, a thorough compromise between weight and strength should be done when designing the side-booms.
Copyright © 2020 Praise Worthy Prize - All rights reserved.


Aeroelasticity; Multi-Rotor Systems; Twin-Rotor; Wind Energy

Full Text:



Global Wind Energy Council (GWEC), Global Wind Report (2018).

A. Halawa et al, Aerodynamic Performance Enhancement Using Active Flow Control on DU96-W-180 Wind Turbine Airfoil, Evergreen 5-1 (2018), 16-24.

Bardera-Mora, R., Conesa, A., Sánchez García, M., Flow Separation Control with a Plasma Actuator Over a Metallic NACA 4418, (2017) International Review of Aerospace Engineering (IREASE), 10 (6), pp. 308-314.

M. Hofmann and I. B. Sperstad, Will 10 MW wind turbines bring down the operation and maintenance cost of offshore wind farms?, Energy Procedia 53 (2014), 231-238.

P. Jameison, Innovation in Wind Turbine Design (Wiley-Blackwell, Chichester UK, 2011).

U. Goltenbott et al, Aerodynamic interaction of diffuser augmented wind turbines in multi-rotor systems, Renewable Energy 112 (2017), 25-34.

P. Chasapogiannis et al, Analysis of the aerodynamic performance of the multi-rotor concept, Journal of Physics Conference Series 524 (2014).

S. Yoshida et al, Coherence Effects on the Power and Tower Loads of a 7x2 MW Multi-Rotor Wind Turbine System, Energies 9 (2016).

N. S. Ghaisas et al, Large-eddy simulation study of multi-rotor wind turbines, Journal of Physics Conference Series 1037 (2018).

M. P. Van der Laan et al, Power curve and wake analyses of the Vestas multi-rotor demonstrator, Wind Energy Science (WES) 44 (2019).

M. P. Van der Laan and M. Abkar, Improved energy production of multi-rotor wind farms, Journal of Physics: Conf. Series 1256 (2019).

U. Hebbar et al, Analysis of Interactional Aerodynamics in Multi-Rotor Wind Turbines using Large Eddy Simulations, AIAA Scitech 2020 Forum, Orlando (2020).

A. Ismaiel and S. Yoshida, Aeroelastic Analysis of a Coplanar Twin-Rotor Wind Turbine, Energies 12(10):1881 (2019).

J. Jonkman et al, Definition of a 5-MW Reference Wind Turbine for Offshore System Development, Report: National Renewable Energy Laboratory (NREL) Colorado USA (2009).

J. Jonkman, The New Modularization Framework for the FAST Wind Turbine CAE Tool, 51st AIAA Aerospace Sciences Meeting (2013), Texas USA.

National Wind technology Center (NWTC) Information Portal, Modes.

Available Online:

B. J. Jonkman and L. Kilcher, TurbSim’s user guide: Version 1.06.00, Report: National Renewable Energy Laboratory (NREL) Colorado USA (2012).

International Electrotechnical Commission (IEC), 19.22. Wind Turbines—Part 1: Design RequirementsIEC-61400-1, Colorado USA (2012).

T. Burton et al, Wind Energy Handbook, second ed. (John Wiley & Sons, UK, 2011).

Harinaldi, H., Budiarso, B., Megawanto, F., Karim, R., Bunga, N., Julian, J., Flow Separation Delay on NACA 4415 Airfoil Using Plasma Actuator Effect, (2019) International Review of Aerospace Engineering (IREASE), 12 (4), pp. 180-186.

Matter, Y., Darabseh, T., Mourad, A., Flutter Analysis of a Tapered Viscoelastic Wing Subjected to a Follower Thrust Force, (2019) International Review of Aerospace Engineering (IREASE), 12 (1), pp. 46-56.


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2021 Praise Worthy Prize