University of Twente Student Theses
CFD-CAA Analysis of Light-Stall Noise Prediction Using DDES and FW-H Analogy for NACA 0012 Airfoil
Zaki, Michael Lawrence Abdulla (2024) CFD-CAA Analysis of Light-Stall Noise Prediction Using DDES and FW-H Analogy for NACA 0012 Airfoil.
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| Abstract: | This study aims to evaluate the use of a CFD-CAA framework, specifically Delayed Detached Eddy Simulations (DDES) coupled with the Ffowcs Williams-Hawkings (FW-H) analogy, to predict far-field noise generated by airfoil self-noise mechanisms, particularly in light-stall conditions. DDES is chosen to address previously mentioned challenges. This hybrid RANS/LES method combines the strengths of RANS for attached boundary layers and LES for separated flows. The surface pressure fluctuations obtained from the numerical flow solution are propagated to far-field observer locations using the FW-H analogy, allowing for noise predictions to be made and compared with experimental data. The CFD analysis of an airfoil in stall requires a large spanwise domain to accurately capture the full vortex structures and predict the emitted noise. However, increasing the domain size while maintaining the necessary mesh resolution to capture small pressure fluctuations can be computationally expensive, often making it impractical. A spanwise correction has been investigated to adjust the acoustic pressure distribution along the span, allowing for a reduction in the required spanwise length of the simulated domain. |
| Item Type: | Essay (Master) |
| Faculty: | ET: Engineering Technology |
| Subject: | 33 physics, 52 mechanical engineering |
| Programme: | Mechanical Engineering MSc (60439) |
| Link to this item: | https://purl.utwente.nl/essays/104574 |
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