S Digard, CADFEM Ireland users‘s meeting sept 24th 2015
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Why optimisation?
• Find the best design… • Company context : moving from proof of concept to industrial scale • We want the lowest Levelized Cost of Energy (LCOE) • Decrease costs, increase performance.
S Digard, CADFEM Ireland users‘s meeting sept 24th 2015
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Optimisation processes • First, a simple case : 2D optimisation of the venturi • Objective : increase power available through the venturi • Constraints: off-axis loads • 4 parameters, ~90 runs in 24h on 8 core machine
S Digard, CADFEM Ireland users‘s meeting sept 24th 2015
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Optimisation processes • 3D optimisation of blades (CFX only), built in workbench • Objective : maximise power • Constraints : depends on projects • More than 30 parameters • around 600 to 700 runs per optimisations need to look into your solve strategy
Blade
The optimisation is controlled by an excel file : - Can create any bi-directional shape we want and writes input files for turboGrid - Can be handy for complex outputs formula - Easy to archive and rerun cases
S Digard, CADFEM Ireland users‘s meeting sept 24th 2015
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Other uses of optimisation • Understand the real stuff • We created a numerical model of our turbine • We optimise the physical parameters of the model to match the outputs of the real machine
1200 Optimisation in Tidal Turbine Design - S Digard.pdf
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