Automated Steady and Transient CFD Analysis of Flow Over Complex Terrain for Risk Avoidance in Wind Turbine Micro-Siting

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1 Automated Steady and Transient CFD Analysis of Flow Over Complex Terrain for Risk Avoidance in Wind Turbine Micro-Siting Global Flow Solutions, Vestas Wind Systems A/S Gregory S. Oxley, Yavor V. Hristov, Seonghyeon Hahn, Cheng-Hu Hu, Søren Mogensen [14 June 2011, Gregory S. Oxley, Global Flow Solutions, Vestas Wind Systems A/S]

2 Presentation Outline Background: Global Flow Solutions Why CFD for wind turbine micro-siting? 3 levels of CFD analysis Part 1: Automatic Wind Park Simulator The process Step-by-step Part 2: Forensic transient analysis Detached-eddy simulation Mesoscale-microscale coupling 2 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

3 Plant Siting & Forecast (formerly Wind & Site Competence Centre) PSF is a shared resource focusing on development within: New software and hardware tools Uniform calculation methods and reporting Sharing knowledge across borders Siting and optimised production calculations Wind resource measurements / risk assessment Weather prediction Staff ~ 30 specialists CFD specialists Meteorologists Ph.D s in mathematics / statistics / physics Engineers / technicians Application developers Computational Resources Jetstream - 1,344 cores Firestorm - 12,222 cores Vestas Americas Vestas Offshore Vestas Pacific Vestas N. Europe Plant Siting & Forecast Vestas C. Europe Vestas China Vestas Med. 3 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

4 What if local wind effects are ignored? Gear box may also have excessive loads due to wind turbulence 4 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

5 Prevention is better than cure 5 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

6 Automatic Wind Park Simulator The BUTTON custom Bash Script OpenFOAM Case i custom Vestas Site Check Pointwise OpenFOAM Case i+1 PowerPoint & Excel Reports Glyph 2 Script OpenFOAM Case N custom W&S engineer Queuing System W&S engineer Jetstream 6 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

7 Automatic Windpark Simulator Steady, turbulent k-ε simulation Vestas Site Check provides industry standard wasp map contour file wasp.map -> plot3d conversion and cut to turbine buffer distance Terrain edge smoothing for even inlets and mesh extrusion considerations 7 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

8 Automatic Windpark Simulator Steady, turbulent k-ε simulation structured hyperbolic mesh extrusion in Pointwise with Glyph2 macro utility used to generate hanging node architecture msh format OpenFOAM format unstructured meshing also available fluent3dmeshtofoam VestasFOAM 8 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

9 Automatic Windpark Simulator Steady, turbulent k-ε simulation customized from simplefoam standard ABL steady profiles k-epsilon turbulence model with modified constants customized inlet/outlet and terrain boundary conditions 9 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

10 Automatic Windpark Simulator Steady, turbulent k-ε simulation automated reports (turbulence intensity, inflow angles, wind shear) Vestas Site Check interface statistical data for power forecasting 10 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

11 Transient Analysis - Mesoscale OpenFOAM coupling Case study: Japanese Wind Park blades damaged on 2 turbines on suspected strong negative wind shear 11 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

12 Mesoscale OpenFOAM coupling Case study: Japanese Wind Park WRF LES simulation at 111 m horizontal resolution initialized with GFS model topography at 1 km resolution 12 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

13 Mesoscale OpenFOAM coupling Case study: Japanese Wind Park ALARM ALARM 13 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

14 Mesoscale OpenFOAM coupling Case study: Japanese Wind Park 14 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

15 Summary Switching to OpenFOAM makes sense: Access to source code Research community involvement Flexibilty Publishable Levels of Support: Steady analysis DES forensic analysis Forest modeling Advanced applications : Dynamically coupled Mesoscale OpenFOAM for 1hr period of interest The future has many possibilities! 15 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011

16 Thank you for your attention Copyright Notice The documents are created by Vestas Wind Systems A/S and contain copyrighted material, trademarks, and other proprietary information. All rights reserved. No part of the documents may be reproduced or copied in any form or by any means - such as graphic, electronic, or mechanical, including photocopying, taping, or information storage and retrieval systems without the prior written permission of Vestas Wind Systems A/S. The use of these documents by you, or anyone else authorized by you, is prohibited unless specifically permitted by Vestas Wind Systems A/S. You may not alter or remove any trademark, copyright or other notice from the documents. The documents are provided as is and Vestas Wind Systems A/S shall not have any responsibility or liability whatsoever for the results of use of the documents by you.

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