Example ZIP file (18Mb) Description PDF file (1313Kb) In this example we take a semi-submersible floating wind turbine platform and divide it into four floating bodies. We use OrcaWave to perform a multibody diffraction analysis of the distributed system. We then use OrcaFlex to perform a dynamic analysis with the pontoons and cross bracings
READ MOREWind loads are included by the aerodynamic drag of platform and turbine. Lines (umbilical and moorings) in OrcaFlex are represented by a lumped mass model. Hydrodynamic loads are calculated based on an extended form of Morison''s equation, that considers both inertia and drag force. For details, see the documentation [33].
READ MOREOrcaFlex''s native coupled modelling is therefore used in the present work to simulate the floating wind turbine, implementing the floating structure and turbine as advised by the relevant definition documents (discussed further in Section 2.2).
READ MOREThis paper uses the TetraSpar floating offshore wind turbine design as a case study to examine new modeling approaches in OrcaFlex and OpenFAST that provide this information. The study proves the possibility of applying the approach and the extraction of internal loads, while also presenting an initial code-to-code verification
READ MOREOrcaFlex 10.3 introduced the turbine object, used to model horizontal axis wind turbines. A key issue for wind turbine analysis is the modelling of the generator
READ MOREThe incidence angle or angle of attack, $alpha$, is always in the range $-180degree lealphale +180degree$. The first and last angles in your table of coefficient data must be -180° and +180° respectively, and (clearly, since these two angles represent the same direction) the two sets of coefficient values for these angles must coincide.
READ MOREIn this paper, an aero-hydro-servo-structure coupled model for the OC4 DeepCWind floating offshore wind turbine was established using Orcaflex software. This model was used to identify constant and frequency-dependent aerodynamic damping, as well as to investigate the effects of aerodynamic damping on dynamic responses of a
READ MOREOpenFAST is an open-source, physics-based engineering tool applicable to the load analysis of land-based and offshore wind turbines, including floating
READ MOREThe validation study considers the National Renewable Energy Laboratory (NREL) offshore 5-MW baseline wind turbine, which is recognised as an industry-standard reference turbine system. Two
READ MOREIn the present study, a 5MW OC4 semisubmersible wind turbine is numerically modeled, simulated, and analyzed by the open-source numerical tool, OpenFAST and in-house numerical tool, Charm3D-FAST.
READ MOREIn the stage of researching and developing large-scale wind turbines, it takes a lot of time and development costs to make actual products, so product verification is performed in advance through scale model tests or simulation using engineering tools OrcaFlex for a 10 MW turbine applied to a FOWT. In this study, we used a floater with a
READ MOREDear NREL Forum Users, Hello. I am looking to compare results between OpenFAST and other analysis tools (Orcaflex) for a FOWT using the DTU 10MW Turbine. While I have completed the numerical model construction using OpenFAST, I am facing difficulties in building a numerical analysis model using Orcaflex. The detailed properties
READ MOREC 12.6%. Python 2.5%. Makefile 0.1%. Controllers for OrcaFlex turbine objects. Contribute to Orcina-Ltd/turbine-controllers development by creating an account on GitHub.
READ MOREAzimuth, declination, gamma. These angles define the orientation of the turbine axes relative to global axes, with gamma defined as for line ends. Declination is in the range 0° to 180°. Range jump suppression is applied to the azimuth and gamma angles, so values outside the range -360° to +360° might be reported.
READ MOREwind turbine platform. This example demonstrates the importance of doing a mesh sensitivity study and explains how to handle the situation where a relatively large superstructure is modelled explicitly in OrcaFlex. The semi-sub being modelled here is based on the DeepCwind platform. The properties of this
READ MOREA large selection of OrcaFlex example files covering a wide range of topics including riser & mooring systems, payload handling, defence and renewables.
READ MOREOrcaFlex is widely used for analysis work related to fixed offshore wind turbines, such as foundation and turbine installation, power cables, cable protection systems etc.,
READ MOREOrcaFlex includes the effects of wind on: Vessels – see current and wind loads. Lines – see hydrodynamic and aerodynamic loads. 6D buoys – see lumped buoy added mass,
READ MOREMore recently, Yan et al. (2023) established a fully coupled model by the combined use of OrcaFlex and OpenFast, to investigate the nonlinear dynamics of catenary mooring system of a 10 MW floating wind turbine in shallow water. In their study, the dynamic mooring modelling was carried out in OrcaFlex based on the finite element
READ MOREOrcaFlex to a code written as part of the author''s PhD study. Static and dynamic comparisons are considered. (NREL) offshore 5 MW reference wind turbine (RWT). The study considers two separate turbine systems: (i) land-based and (ii) floating, based on the OC3 Hywind system. A range of select OrcaFlex results are compared against
READ MOREIn this application, FAST is responsible for capturing the aerodynamic loads and flexure of the wind turbine and its tower, and OrcaFlex models the mooring line and hydrodynamic effectsbelow the water surface. This paper investigates the accuracy and stability of the FAST/OrcaFlex coupling operation. AB - To enable offshore floating wind
READ MOREIn recent versions, OrcaFlex also includes an aerodynamic solver and blade element momentum (BEM) process enabling simultaneous consideration of the
READ MOREA full technical specification for OrcaFlex, including key features, model object descriptions, user interface and much more. Also available to download. Inertia compensation to avoid double-counting for large superstructures e.g. floating wind turbine; BUOYS. Full 3D and 6D modelling of buoys; Lumped option with overall properties;
READ MOREK03 15MW semi-sub FOWT. This example models a floating offshore wind turbine (FOWT). The turbine rotor represents version 1.1.3 of the 15MW reference wind turbine (RWT), developed as part of the International Energy Agency''s (IEA) Wind Task 37. The turbine takes the form of a three-bladed rotor with variable-speed and collective blade-pitch
READ MOREA set of wind tunnel experiments was performed to study the average and fluctuating wind loading on an "infinite" 2D square prism with rounded edges of r/D = 0.16 for different heights of
READ MOREOrcaFlex Coupling Module for Integrating Turbine and Mooring Dynamics of Offshore Floating Wind Turbines Preprint . Marco Masciola, Amy Robertson, Jason Jonkman, and Frederick Driscoll. To be presented at the 2011 International Conference on Offshore Wind Energy and Ocean Energy . Beijing, China . October 31 – November 2, 2011 . Conference
READ MOREIn this application, FAST is responsible for capturing the aerodynamic loads and flexure of the wind turbine and its tower, and OrcaFlex models the mooring line and hydrodynamic effects below the
READ MOREOrcaFlex Interface. OrcaFlex is a commercial software package for the design and analysis of marine systems. When the OrcaFlex Interface module is used in FAST v8, all hydrodynamic and mooring loads will be computed using OrcaFlex, while the turbine, tower, and floating platform structural dynamics; aerodynamics; and control and electrical
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