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Northwest National Marine Renewable Energy Center
NW National Marine Renewable Energy Center
Turbine Performance and Wake Prediction
Alberto Aliseda, Sylvain Antheaume, Teymour Javaherchi, Joseph Seydel
Department of Mechanical EngineeringUniversity of Washington
NOAA Northwest Fisheries Science Center 12/08/2009
Northwest National Marine Renewable Energy Center
Device Performance and Wake Modeling
Fluid Mechanics Modeling:
- flow around turbine blades
- flow in the turbine wake
- wake-turbine interactions
- wake-wake interactions
Northwest National Marine Renewable Energy Center
Device Performance and Wake Modeling
We use a hierarchy of numerical models for simulation of different aspect of the physics:
- Porous Disk: Drag and Energy Dissipation
- Virtual Blade Model: Axisymmetric and Steady
- S/M Reference Frame: Navier-Stokes in a rotating reference frame
- Moving Mesh: Full blade representation.
Northwest National Marine Renewable Energy Center
Wake Modeling
Because of the concentrated nature of tidal energy, understanding the wake-turbine and wake-wake interactions is key to the development of this technology.
Turbine spacing rules developed for wind farms can not easily be extended to tidal. They are empirical, not derived from first principles and not formulated in terms of non-dimensional parameters.
Northwest National Marine Renewable Energy Center
Wake Modeling: Near Wake
The near wake has important technological and environmental effects:
- Sediment scouring by high speed tip flows
- Bio effects of pressure fluctuations in tip vortices: fish bladder.
Northwest National Marine Renewable Energy Center
Wake Modeling: Near Wake
Northwest National Marine Renewable Energy Center
Wake Modeling: Far Wake
The far wake has a dominant role in turbine array design and estuarine dynamics:
- Efficient turbine spacing in narrow high kinetic energy channels
- Stratification and mixing in tidal channels
- Estuarine circulation: flow exchange, nutrient and oxygen concentrations.
Northwest National Marine Renewable Energy Center
Wake Modeling: Far Wake
Northwest National Marine Renewable Energy Center
Wake Modeling: Far Wake
Northwest National Marine Renewable Energy Center
Turbine Modeling: Experimental Validation
Plans to build a large-scale hydrodynamic testing facility