**Author details**

well as rapid variation, in *Cp*. A *Cp* maximum of 62% was achieved when TSR was equal to 1.75. The value of the average *Cp* was 44.33% per cycle. Though Darrieus turbine is very simple to be constructed, it has some disadvantages when compared to axial turbines since they exhibit a lower power coefficient and a variation in the torque produced within the cycle, leading to periodic loading on the components of

The authors gratefully acknowledge the financial support provided by the Colombia Scientific Program within the framework of the call Ecosistema Cientifico

the turbine.

**Acknowledgements**

**Abbreviations**

**Nomenclature**

*P* power required *ρ* water density *V* water speed *θ* Azimuth angle

*CD* drag coefficient *CL* lift coefficient *CP* power coefficient *T* turbine torque *I* AXIAL thrust

**184**

*ψ* turbine rotational speed *λ* blade tip-speed ratio (TSR) *α* blade angle of attack *AR* blade aspect ratio *H* turbine height *σ* solidity *R* turbine radius *D* turbine diameter *B* number of blades *c* blade chord length *a* axial induction factor *A* swept area of the turbine

TSR tip-speed ratio

LES large eddy simulation DNS direct numerical simulation

DES detached eddy simulation

(Contract No. FP44842-218-2018).

*Computational Fluid Dynamics Simulations*

CFD computational fluid dynamics

BEM blade element momentum theory DMS double multiple streamtube RANS Reynolds-averaged Navier-Stokes

URANS unsteady Reynolds-averaged Navier-Stokes

Edwin Lenin Chica Arrieta<sup>1</sup> \*† and Ainhoa Rubio Clemente1,2†

1 Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Antioquia UdeA, Medellín, Colombia

2 Facultad de Ingeniería, Tecnólogico de Antioquia-Institución Universitaria TdeA, Medellín, Colombia

\*Address all correspondence to: edwin.chica@udea.edu.co

† These authors contributed equally.

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
