Nicholas Robinson's picture
Submitted by Nicholas Robinson on May 12, 2016 - 4:09pm
Main hypothesis

Uses maximum of eddy-viscosity wake model and a boundary layer wake model at each turbine for each case or timestep.


Submitted by Martijn van Roermund on September 10, 2015 - 11:32am
Main hypothesis
The computer program Phatas, ”Program for Horizontal Axis wind Turbine Analysis and Simulation”, is developed for the time-domain calculation of the dynamic behaviour and the corresponding loads on a Horizontal Axis wind Turbine. Phatas calculates the dynamic response of a wind turbine that covers the structural dynamic deformation of the turbine structure, the unsteady aerodynamic loads on the blades and tower, and the interactions from an operational controller and a Supervisory controller. The mutual equilibrium between all these sub-models is obtained by performing each time step an iterative solution of the full non-linear set of coupled equations. The program Phatas is developed as a tool under the design package FOCUS6, maintained by WMC. Within FOCUS6, the aerodynamic capabilities can be extended by linking Phatas to external calculation modules, such as the ECN Aeromodule.

FAST v8 + OrcaFlex 10.1

Submitted by Josean Galvan on August 27, 2015 - 11:55am
Main hypothesis
FAST is a wind turbine modelling program developed by the US National Renewable Energy Laboratory (NREL). FASTlink is an experimental package that can be used to run coupled OrcaFlex + FAST simulations of floating wind turbine systems. In such coupled simulations FAST models the turbine aerodynamic loads and response, and the turbine control and power take-off system, but OrcaFlex models the platform hydrodynamic loads and mooring loads and response.


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.

WeFarm 1.0

Xiaodong Zhang's picture
Submitted by Xiaodong Zhang on May 5, 2015 - 10:39am
Main hypothesis

1. Steady state Atmospheric Boundary Layer flow. Incoming wind velocity profile is based on logarithmic distribution with stratification amendments for non-neutrual conditions. Different from surface layer, the mixing length L is defined as: 1/L = 1/z + 1/Lm + 1 / (zi - z), where z is evelation, zi is thickness of ABL and Lm is a middle length.  

2. No gravity and vertical pressure gradient for neutrual stratification. Potential temperature is adopted for non-neutrual conditions, and a reverse cap is simulated for the convective boundary layer.  

3. A logrithmic profile is used for turbulent flow wall function.