CFD for Wind and Tidal Offshore Turbines by Esteban Ferrer, Adeline Montlaur

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By Esteban Ferrer, Adeline Montlaur

The ebook encompasses novel CFD thoughts to compute offshore wind and tidal applications.

Computational fluid dynamics (CFD) concepts are considered as the most layout device to discover the recent engineering demanding situations awarded via offshore wind and tidal generators for power iteration. the trouble and prices of venture experimental exams in offshore environments have elevated the curiosity within the box of CFD that's used to layout applicable generators and blades, comprehend fluid movement actual phenomena linked to offshore environments, are expecting strength construction or characterise offshore environments, among different issues.

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The interface Halo-Cell sliding mesh approach simplifies the coding, specially in 3D, since it only requires the construction of a single halo cell, instead of the standard methodologies that require the computation of intersections between non edges (2D) or faces (3D) of the nonconforming elements at the interface. Note that this method does not assure mass conservation. However, in the numerical tests we have observed that the magnitude of the conservation error is below the magnitude of the error in the variables, and the order of convergence is at least the same than for the variables.

Accessed 02 Dec 2014 12. Montlaur A, Fernandez-Mendez S, Huerta A (2008) Discontinuous Galerkin methods for the Stokes equations using divergence-free approximations. Int J Numer Methods Fluids 57(9):1071–1092 13. Montlaur A, Cochard S, Fletcher DF (2012) Formation of tip-vortices on triangular prismaticshaped cliffs. Part 2: A computational fluid dynamics study. J Wind Eng Ind Aerodyn 109:21– 30 14. Montlaur A, Fernandez-Mendez S, Huerta A (2012) High-order implicit time integration for unsteady incompressible flows.

The disadvantage of RANS models is that the flow is temporally averaged and thus unsteady vortices shed off turbine blades are damped and their influence reduced. Large-Eddy Simulations achieve a more accurate representation of the instantaneous flow [14, 18], which appears to be critical for VATT simulations, because the downstream side of a VATT is affected significantly by the vortices shed on the upstream side. In all above-mentioned studies, the sliding mesh technique is used to represent the movement of the blades in relation to the fixed Eulerian fluid mesh.

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