Airfoil Trailing-Edge Blowing: Broadband Noise Prediction from Large-Eddy Simulation

AIAA Journal ◽  
2012 ◽  
Vol 50 (2) ◽  
pp. 294-303 ◽  
Author(s):  
Julian Winkler ◽  
Stéphane Moreau ◽  
Thomas Carolus
Keyword(s):  
Large Eddy Simulation ◽  
Broadband Noise ◽  
Noise Prediction ◽  
Trailing Edge ◽  
Eddy Simulation ◽  
Large Eddy

Broadband noise prediction using large eddy simulation and a frequency domain method

2017 ◽  
Vol 117 ◽  
pp. 94-105 ◽  
Author(s):  
Fan Tong ◽  
Wei-Yang Qiao ◽  
Wei-Jie Chen ◽  
Liang-Feng Wang ◽  
Xun-Nian Wang
Keyword(s):  
Large Eddy Simulation ◽  
Frequency Domain ◽  
Broadband Noise ◽  
Frequency Domain Method ◽  
Noise Prediction ◽  
Eddy Simulation ◽  
Domain Method ◽  
Large Eddy

Trailing-edge noise reduction using derivative-free optimization and large-eddy simulation

2007 ◽  
Vol 572 ◽  
pp. 13-36 ◽  
Author(s):  
ALISON L. MARSDEN ◽  
MENG WANG ◽  
J. E. DENNIS ◽  
PARVIZ MOIN
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Cost Function ◽  
Broadband Noise ◽  
Optimization Techniques ◽  
Trailing Edge ◽  
Eddy Simulation ◽  
Derivative Free Optimization ◽  
Derivative Free ◽  
Large Eddy

Derivative-free optimization techniques are applied in conjunction with large-eddy simulation (LES) to reduce the noise generated by turbulent flow over a hydrofoil trailing edge. A cost function proportional to the radiated acoustic power is derived based on the Ffowcs Williams and Hall solution to Lighthill's equation. Optimization is performed using the surrogate-management framework with filter-based constraints for lift and drag. To make the optimization more efficient, a novel method has been developed to incorporate Reynolds-averaged Navier–Stokes (RANS) calculations for constraint evaluation. Separation of the constraint and cost-function computations using this method results in fewer expensive LES computations. This work demonstrates the ability to fully couple optimization to large-eddy simulation for time-accurate turbulent flow. The results demonstrate an 89% reduction in noise power, which comes about primarily by the elimination of low-frequency vortex shedding. The higher-frequency broadband noise is reduced as well, by a subtle change in the lower surface near the trailing edge.

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