Grid Open Days all’Università di Palermo Palermo,

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Presentation transcript:

Grid Open Days all’Università di Palermo Palermo, 6-7.12.2007 Airfoils Characterization by means of CFD Simulations in GRID Environment Prof. Ing. Rosario Lanzafame Dipartimento di Ingegneria Industriale e Meccanica Facoltà di Ingegneria – Università degli Studi di Catania Viale A.Doria, 6 – 95125 Catania rlanzafa@diim.unict.it Grid Open Days all’Università di Palermo Palermo, 6-7.12.2007

Blade Element Momentum Theory Drag and Lift Coefficients Outline Blade Element Momentum Theory Drag and Lift Coefficients Proposed Application Results and Discussion Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Blade Element Momentum Theory The BEM Theory is a 1-D mathematical theory based on bi-dimensional measurements of lift and drag airfoil coefficients able to evaluate forces and torque on wind turbines rotors The BEM theory is widely used in fluid dynamics wind turbines design due to its good agreement with experience Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Blade Element Momentum Theory

Blade Element Momentum Theory (7)

airfoil angle of attack streamlines wind speed Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Drag and Lift Coefficients Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Drag and Lift Airfoil Coefficients Evaluation

Lift Coefficient vs Angle of Attack

Drag Coefficient vs Angle of Attack

Airfoil characterization Application Scheme Send inputs Application core OPTIMIZER USER INTERFACE PERFORMACE Retrieve results DESIGN Airfoil definition Airfoil characterization Airfoil database Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Airfoil Database For each Reynolds number and angle of attack, the airfoil database contains: Drag coefficient Lift coefficient Pressure fields Velocity fields … Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

VELOCITY CONTOURS (S809 airfoil) Preliminary Results VELOCITY CONTOURS (S809 airfoil) Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

TOTAL PRESSURE CONTOURS (S809 airfoil) Preliminary Results TOTAL PRESSURE CONTOURS (S809 airfoil) Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Local Machine Running time Processor: Intel(R) Core™ 2 Duo CPU T7500@2.20 GHz RAM: 2047 MB Operating System: Microsoft(R) Windows VISTA 32 bit Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

GRID Running Time Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Total Running Time Local Machine: 494 min Comparisons Total Running Time Local Machine: 494 min Total Running Time GRID: 382 min Mean Variation: 22 % Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

About 100 airfoils database Automatic mesh implementation on GRID Future Developments About 100 airfoils database Automatic mesh implementation on GRID Stall mathematical model implementation Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

Any Questions ? Thank you very much for your kind attention! Palermo, Grid Open Days all’Università di Palermo, 6-7.12.2007

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