ASHES: A Novel Tool for FEM analysis of Wind Turbines with innovative visualization techniques. Statkraft Ocean Energy Research Program
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1 ASHES: A Novel Tool for FEM analysis of Wind Turbines with innovative visualization techniques
2 Content: 1. Introduction: Status for aeroelastic software 2. ASHES: 1. What? 2. Why? 3. Benchmarking (OC4, Norcowe/Nowitech Blindtest) 4. DEMO (hopefully live ) 5. What s next?
3 1. (Incomplete) status for Aeroelastic software Def: Coupled analysis of a wind turbine including: Aerodynamics Blades/rotor Tower Control system Mode shape analysis, Multi Body Systems, and/or FEM
4 Main results: Natural frequency analysis Time domain simulation (for fatigue design) Recent trend: Adapting for offshore wind turbines Moving to FEM analysis
5 There are many different codes in use and under development, e.g.: NREL: FAST (free and open source) DTU: Flex (quasi-commercial) Risø: HAWC2 (half-commercial) GL GH: Bladed (leading commercial program) Many others!
6 Content: 1. Status for aeroelastic software 2. ASHES: 1. What? 2. Why? 3. Benchmarking (OC4, Norcowe/Nowitech Blindtest) 4. DEMO (hopefully live ) 5. What s next?
7 2.1 ASHES: What is it? Aero-Servo-Hydro-Elastic-Simulation Developed at NTNU, so-far funded mostly by the How we hope it will be different: Simultaneous focus on Numerical results GUI (Graphical User Interface) Visualization Fun to use
8 New users groups: Traditional: Experienced professionals New: Inexperienced professionals New: Students Based on an object oriented FEM framework with full access to C++ source code
9 2.2 ASHES: Why bother? Does the world really need another aeroelastic code?
10 Signs there are reasons to bother: The huge interest indicates that it makes sense! International cooperation OC4 project Google isn t interested (yet) The market (wind energy) has a huge growth
11 2.3 ASHES Benchmarking A. OC4 project B. NORCOWE/NOWITECH Wind tunnel blindtest C. Comparison with other experimental data from NTNU
12 A. The OC4 project Offshore Code Comparison Collaboration Continuation Continuation of OC3 Phase 1: 5MW WT with tubular tower and jacket on 45 m depth (Later: Phase 2: Semi-sub floater) 15 different codes and groups actively taking part Paper for ISOPE 2012
13 OC4 Load case 2.3a, Airy wave H=6m, T=10s, no wind Sensor 53: Sum of horizontal support reactions
14 NORCOWE/NOWITECH Blindtest Workshop Calculations for a model wind turbine tested in the NTNU wind tunnel Test of the BEM implementation
15 Cp curve
16 C. Comparison with experimental data from NTNU Tidal turbine in towing tank (Celine Faudot/Ole G. Dahlhaug) Yawed rotor in wind tunnel (Tania Bracchi/Per Åge Krogstad)
17 ASHES Demo
18 ASHES: What is it? Part II GUI focus An effective and attractive GUI is expected from a modern tool The GUI is very useful also in the development process NB: A non-gui option will also be provided for the end user
19 Real-time analysis No video Start-Pause-Stop Increase decrease analysis speed
20 Effective visualization Simple vs. complex Investigate Blade visualization Load visualization Velocity triangle
21 Professional software development practices Source control Effective and safe development Enables (international) hands-on cooperation Object oriented programming Visual studio, C++ Documentation, testing Group programming
22 2.4 ASHES: What s next? New functionality governed by needs from ongoing research, benchmarking,and model tests Flexible (FE) blades also in time domain analysis Blade design and optimization (MSc thesis project)
23 Advanced wave models Combined waves and current (for tidal turbine) Define and run multiple analyses Optimization for speed Make available for pilot users
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