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| Format: | Preprint |
| Published: |
2025
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| Online Access: | https://arxiv.org/abs/2502.16676 |
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| _version_ | 1866913703504379904 |
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| author | Eydi, Faezeh |
| author_facet | Eydi, Faezeh |
| contents | With the growing demand for electricity and increasing interest in renewable energy, wind turbine noise pollution has become a more pressing issue. Aerodynamic noise not only impacts human well-being but also affects wildlife. This study investigates the aeroacoustics and aerodynamics of a two-dimensional circular cylinder exposed to turbulent flow at a fixed Reynolds number of 22,000. A key novelty of this research is the introduction of a passive control technique, achieved by designing a structure with two thin annular plates positioned around the cylinder in the circumferential space. The numerical analysis is conducted using unsteady Reynolds-averaged Navier-Stokes (URANS) methods in combination with the Ffowcs Williams and Hawkings (FW-H) acoustic analogy. The control assessments reveal substantial performance improvements, with reductions of 89.46% in the mean drag coefficient and 86.6% in the Strouhal number for the modified cylinder. From an acoustic perspective, the passive control method achieves a maximum noise reduction of 39 dB, with a notable drag reduction of 50.62% in a specific case. This innovative design offers a highly efficient and cost-effective solution for noise reduction and wake control in wind turbine applications. Its eco-friendly nature, ease of implementation, and maintenance-free operation make it a promising approach for enhancing wind turbine performance without additional energy consumption. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_16676 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flow and Noise Control of a Cylinder with Annular Plates Eydi, Faezeh Fluid Dynamics With the growing demand for electricity and increasing interest in renewable energy, wind turbine noise pollution has become a more pressing issue. Aerodynamic noise not only impacts human well-being but also affects wildlife. This study investigates the aeroacoustics and aerodynamics of a two-dimensional circular cylinder exposed to turbulent flow at a fixed Reynolds number of 22,000. A key novelty of this research is the introduction of a passive control technique, achieved by designing a structure with two thin annular plates positioned around the cylinder in the circumferential space. The numerical analysis is conducted using unsteady Reynolds-averaged Navier-Stokes (URANS) methods in combination with the Ffowcs Williams and Hawkings (FW-H) acoustic analogy. The control assessments reveal substantial performance improvements, with reductions of 89.46% in the mean drag coefficient and 86.6% in the Strouhal number for the modified cylinder. From an acoustic perspective, the passive control method achieves a maximum noise reduction of 39 dB, with a notable drag reduction of 50.62% in a specific case. This innovative design offers a highly efficient and cost-effective solution for noise reduction and wake control in wind turbine applications. Its eco-friendly nature, ease of implementation, and maintenance-free operation make it a promising approach for enhancing wind turbine performance without additional energy consumption. |
| title | Flow and Noise Control of a Cylinder with Annular Plates |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2502.16676 |