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HAWC2

Submitted by Anders Yde on August 24, 2015 - 2:00pm
Main hypothesis
HAWC2 consists of models describing the external effect, applied loads, structural dynamics and connection to the control system. The external effects models how the wind, waves and soil is expected to behave. The applied loads models how the external effects interact with the structure through aerodynamic, hydrodynamic and soil models. The structural formulation of HAWC2 is based on a multibody system. This enables a wide range of model capabilities and the possibility to include non-linear geometric effects. Wind turbine control is preformed through external DLL´s (Dynamic Link Library) that operates the system under different conditions.

Omnivor

Submitted by Emmanuel Branlard on May 4, 2015 - 6:11pm
Main hypothesis

Homogeneous Incompressible Newtonian fluid under conservative forces, viscous splitting assumption (separate convection/diffusion steps).

Omnivor is a vortex code that uses Lagrangian tracking of vorticity using low order singular and regularized vortex elements. Bodies may be represented using source elements.

Elements intensities may be a combination of prescribed intensities, intensities determined by solving of non-penetration condition or intensities determined using tabulated profile data and a Lifting line formulation.

GCL

Submitted by Gunner Chr. Larsen on May 4, 2015 - 5:57pm
Main hypothesis

- Steady wind farm flow field based on linear superposition of wake contributions

- Wake contributions based on analytical solution of rotationally symmetric boundary layer equations 

- Turbulence closure: Prandtl's mixing length approach

DWM-HAWC2

Submitted by Torben Juul Larsen on May 4, 2015 - 5:42pm
Main hypothesis

The Dynamic Wake Meandering method uses the wind speed deficit of the upstream turbine together with a meandering process in order to simulate the incoming flow field of the downstream turbine and thereby enabling detailed analysis of both production and loading through aeroelastic computations. The meandering process causes an intermittent appearance of the flow field with periods of full, half or no wake situation—varying from time to time driven by the low frequency large-scale natural turbulence.

DWM

Submitted by Gunner Chr. Larsen on May 4, 2015 - 5:39pm
Main hypothesis

The basic philosophy is to consider wakes as passive tracers continuously emitted from the wind farm turbines. The basic idea is a split of scales in the wake flow field, based on the conjecture that large turbulent eddies are responsible for stochastic wake meandering only, whereas small turbulent eddies are responsible for wake deficit attenuation and expansion in the meandering frame of reference as caused by turbulent mixing.