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TEAMER: Advanced Wave-to-Wire OWC model in WEC-Sim
Accurate numerical models are crucial for the development of wave energy converter (WEC) technologies, providing the means for power production and lifetime assessment, site selection, and design of mooring lines, PTO systems and controllers, among other aspects. This project aims at developing a wave-to-wire (w2w) numerical model for floating oscillating water column (OWC) devices based upon the Wave Energy Converter SIMulator (WEC-Sim) platform. To that end, nonlinear hydrodynamics, considering viscous and nonlinear Froude-Krylov effects were implemented, and new capabilities were articulated into the WEC-Sim platform, incorporating thermos-aerodynamic effects for the air-turbine. For this submission, a numerical model of a wave-to-wire controller was developed, and its efficiency and performance tested numerically. In addition to this, a mooring system was also included in the numerical model. The hydrodynamic coefficients for the OWC were calculated using different numerical solvers: ANSYS, WAMIT, Capyatine, and NEMOH. Additionally, two distinct contrasting modeling approaches were tested and the resulting data included. In the first approach, the WEC's main structure and the OWC are modeled as separate entities. In the second, the WEC and OWC are considered a single body, with the free surface of the oscillating water column added as an extra degree of freedom. Nonlinear hydrodynamic effects, including viscosity and nonlinear Froude-Krylov forces, are incorporated to assess their impact on the numerical analysis of OWC systems. This repository contains: - The final TEAMER Post Access Report - A comprehensive file of data and code for advanced WEC-Sim modeling and Wave-to-Wire control of Oscillating Water Column wave energy converters - A ReadMe file describing the project's Rigid Body Approach and Generalized Body Modes (GBM) Approach to modeling, the two control approaches (Wave-to-Wire (W2W) Optimal Control and Turbine Efficiency Maximization), and the contents of each folder within the data file - link to the WEC-Sim Project GitHub (https://wec-sim.github.io/WEC-Sim/main/index.html) - link to the WEC-Sim Wave Energy Converter Simulator MHKDR Submission (https://mhkdr.openei.org/submissions/616) The data file includes: - the preliminary results for the Rigid Body Approach using the pseudo spectral model - BEM results from different numerical solvers including WAMIT, NEMOH, Capytaine, and Ansys - model files and results for the Generalized Body Motion Approach, using a wave-to-wire optimal control - model files and results for the Generalized Body Motion Approach, using a Turbine Energy Maximization control approach - model files and results for the Generalized Body Mode Approach without any specific control approach - American Control Conference 2025 codes for the 2025 IEEE Conference on Control Technology and Applications (CCTA) accepted paper titled "Optimal Control of Floating Oscillating Water Column Wave Energy Converters". This paper will be added to this submission following its release.
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TEAMER: Original HANNA Mono-Radial Turbine Post Access Report
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Final report on a TEAMER RFTS 2 (request for technical support) study undertaken by Alden Research Laboratory for the Mono-radial turbine invented by John Clark Hanna DBA: Hanna Wave Energy Primary Drives. The study is a predictive numerical and CFD (computational fluid dynamics) report of the mentioned Hanna Mono-Radial Turbine. The device is an impulse-type mono-radial air turbine PTO for wave energy conversion. The turbine is self-rectified, meaning that it spins in one direction only while capturing the bi-directional air flows developed within an OWC (Oscillating Water Column) system.
TEAMER: Mass of Water Turbine Current Energy Converter CFD Results
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The CFD (computational fluid dynamics) results for the Mass of Water Turbine (MOWT) current energy converter from MWNW Consulting (formerly Ecosse IP). Each case is self-contained in its own tar.gz archive file. The archive contains the scripts required to perform a full simulation using OpenFOAM v1906. The scripts to process the output and plot forces are included in "Plotting Scripts", and all computational meshes generated are included in "Computational Grids". Project is part of the TEAMER RFTS 2 (request for technical support) program.
TEAMER: AquaHarmonics High Fidelity WEC Sim PTO and Control Model Validation, Sim Model
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Collaborative effort between AquaHarmonics, Sandia National Laboratories (SNL), and the National Renewable Energy Laboratory (NREL) to revise and validate Aquaharmonics' full wave to wire model, allowing for reduced uncertainty and increased understanding of design requirements of a utility scale wave energy converter (WEC). SNL and NREL in collaboration with AquaHarmonics, will set up and run WEC Simulator (WEC-Sim) models of the AquaHarmonics WEC, building off past model developments for inclusion of custom PTO (power take-off) dynamics. The intent is to review, update, and verify or validate a new WEC-Sim model against wave tank experimental data. Furthermore, the WEC-Sim model will be coupled to an energy storage system model to better understand the wave-to-wire functionality. Project is part of the TEAMER RFTS 2 (request for technical support) system of WEC research projects. Testing data can be found in the associated MHKDR link below.
State Estimation for advanced control of wave energy converters
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A report on state estimation for advanced control of wave energy converters (WECs), with supporting data models and slides from the overview presentation. The methods discussed are intended for use to enable real-time closed loop control of WECs.
Aquantis 2.5 MW Ocean Current Generation Device - MHK Hydrofoils Design, Wind Tunnel Optimization and CFD Analysis Report
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Dataset contains MHK Hydrofoils Design and Optimization and CFD Analysis Report for the Aquantis 2.5 MW Ocean Current Generation Device, as well as MHK Hydrofoils Wind Tunnel Test Plan and Checkout Test Report.
TEAMER: Laboratory Upgrade Point Absorber v2 CAD Model and Bill of Materials
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The Laboratory Upgrade Point Absorber (LUPA) is an open-source wave energy converter designed and tested by Oregon State University. The computer-aided design (CAD) files are provided here in two forms: the original SOLIDWORKS (2024) model as "LUPA SOLIDWORKS.zip" and as a STEP file "LUPA-A1000.step". The bill of materials is provided as an Excel file with assemblies (LUPA-Axxx), part numbers (LUPA-Axxx-Pyyy), part descriptions, manufacturers, and manufacturer part numbers. An engineering drawing is provided as a PDF of the basic float and spar geometries and mass properties. This comprehensive CAD model represents LUPA as it was deployed in Fall 2023 testing (project name: TEAMERLUPA2) at the O.H. Hinsdale Wave Research Laboratory. The mass properties, including mass, center of gravity, and moments of inertia, have been overridden for some parts and assemblies to match the physical device properties as determined from experiments. This appears as "overridden by user" when viewing mass properties in SOLIDWORKS. The LUPA-A1000.SLDASM file from the LUPA SOLIDWORKS.zip folder is the topmost assembly; open this file to see the entire model as one assembly. This model is the second published CAD model of LUPA. The first is linked below as Version 1. This second model has the following engineering changes: moved spar flotation up, added more mass to the heave plate, added the MiniDAQ to the float, and reduced the weight of the PTO pulleys. The net effect of these changes makes LUPA more hydrodynamically stable than the first version. See "PMEC Page" and the "Signature Project Page" resources below for more information on LUPA. This testing was funded by TEAMER RTFS 7. Data from this testing can be found on MHKDR at the links below.
TEAMER: CFD Data on a Vertical Axis Wave Turbine
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In this study from January to July of 2023, different variations of the original geometry of a vertical-axis wave turbine (VAWT) were generated and evaluated for hydrodynamic power efficiency using computational fluid dynamics (CFD). The key geometrical parameters considered in this parametric study included the chord length of the rotor blades and the horizontal semi-axis length. The immersion depth of the rotor was also examined as a key deployment parameter for the wave turbine. The CFD simulation results revealed that a medium chord length of the blade (i.e., the same as that of the baseline design) and a shorter horizontal semi-axis for the guide curve of the blade than that of the baseline design resulted in higher hydrodynamic power to extract. With the most efficient turbine rotor geometry identified in this study, a deployment depth that could assure full submergence of the rotor in waves but as close to the free surface as possible led to a higher hydrodynamic power. These findings revealed a pathway for the improvement of the wave turbine energy efficiency. This project is part of the TEAMER RFTS 6 (request for technical support) program.
Advanced TidGen Power System - Control and SCADA System
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The TidGen Power System generates emission-free electricity from tidal currents and connects directly into existing grids using smart grid technology. The power system consists of three major subsystems: shore-side power electronics, mooring system, and turbine generator unit (TGU) device. This submission includes a technical report on control system development, supporting simulations and supervisory control and data acquisition (SCADA) system requirements. Also included is the final design of the control and SCADA system, with supporting simulations and risk mitigation control strategies to address major system technical risks.
RANS Simulation VBM of Single Lab Scaled DOE RM1 MHK Turbine
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Attached are the .cas and .dat files for the Reynolds Averaged Navier-Stokes (RANS) simulation of a single lab-scaled DOE RM1 turbine implemented in ANSYS FLUENT CFD-package. The lab-scaled DOE RM1 is a re-design geometry, based of the full scale DOE RM1 design, producing same power output as the full scale model, while operating at matched Tip Speed Ratio values at reachable laboratory Reynolds number (see attached paper). In this case study the flow field around and in the wake of the lab-scaled DOE RM1 turbine is simulated using Blade Element Model (a.k.a Virtual Blade Model [VBM]) by solving RANS equations coupled with k-\omega turbulence closure model. It should be highlighted that in this simulation the actual geometry of the rotor blade is not modeled. The effect of turbine rotating blades are modeled using the Blade Element Theory. This simulation provides an accurate estimate for the performance of device and structure of it's turbulent far wake. Due to the simplifications implemented for modeling the rotating blades in this model, VBM is limited to capture details of the flow field in near wake region of the device. The required User Defined Functions (UDFs) and look-up table of lift and drag coefficients are included along with the .cas and .dat files.
Advanced TidGen Power System - Deployment and Mooring System
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The TidGen Power System generates emission-free electricity from tidal currents and connects directly into existing grids using smart grid technology. The power system consists of three major subsystems: shore-side power electronics, mooring system, and turbine generator unit (TGU) device. This submission includes the technical report on deployment and mooring system design requirements and subsystem risk analysis. A primary goal of the Advanced TidGen Power System project is to adapt ORPC's buoyant tensioned mooring system (BTMS) to the Advanced TidGen turbine generator unit (TGU). The TGU, as determined at the System Definition Review held in June 2017, is a dual-driveline, stacked system that implements hydrodynamic improvements for turbine design, turbine-turbine interactions and turbine-structure interactions. A major challenge for mooring and deployment system design will be to account for the substantial increases in loading incurred from increased power production and the resulting system drag during operation. Figure 1 shows the current system as presented for the Preliminary Design Review held in October 2017. This document addresses major risks, preventative measures, and mitigation strategies that have influenced this design and continue to drive development work toward the next design iteration. Also included is the technical report on mooring system design, supporting analytical models, and subsystem FMEA. Maine Marine Composites (MMC) has developed a simulation model to design a mooring system for Ocean Renewable Power Company) TidGen tidal energy converter. This document describes the simulation model, results, and the status of the current mooring system design. A preliminary anchor design is also proposed by MMC. The anchor is primarily a concrete gravity anchor. Structural steel is embedded inside the concrete to provide strength for the chain connection points. Steel L Channels also protrude underneath the concrete to act as a skirt to provide additional resistance.
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