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]
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
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
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
Prevention is better than cure 5 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011
Automatic Wind Park Simulator The BUTTON custom Bash Script OpenFOAM Case i custom Vestas Site Check Pointwise OpenFOAM Case i+1 PowerPoint & Excel Reports Email 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
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
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
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
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
Transient Analysis - Mesoscale OpenFOAM coupling Case study: Japanese Wind Park blades damaged on 2 turbines on 2010-12-27 suspected strong negative wind shear 11 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011
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
Mesoscale OpenFOAM coupling Case study: Japanese Wind Park ALARM ALARM 13 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011
Mesoscale OpenFOAM coupling Case study: Japanese Wind Park 14 6th OpenFOAM Workshop, Penn State, USA, 14 June, 2011
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
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