Numerical Investigation of Flow Control of a Circular Cylinder Using a Synthetic Jet Actuator at the Rear Stagnation Point
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI, cilt.32, sa.4, ss.1-10, 2026 (ESCI, TRDizin)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 32 Sayı: 4
- Basım Tarihi: 2026
- Doi Numarası: 10.65206/pajes.1919348
- Dergi Adı: PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), TR DİZİN (ULAKBİM)
- Sayfa Sayıları: ss.1-10
- Orta Doğu Teknik Üniversitesi Kuzey Kıbrıs Kampüsü Adresli: Evet
Özet
Flow control of bluff bodies is of significant interest due to its direct impact on aerodynamic drag and wake dynamics. In this study, active flow control of a circular cylinder at a Reynolds number of 200000 is investigated using a synthetic jet actuator (SJA) positioned at the rear stagnation point. The baseline flow is first validated, and the dominant vortex shedding frequency is identified through spectral analysis. The actuator is then operated at the natural shedding frequency and its sub-harmonic to examine lock-on and sub-harmonic forcing effects. A parametric study is conducted by varying the momentum coefficient over the range of momentum coefficients between 0.0040 to 0.0288. The results show that sub-harmonic forcing provides superior performance, achieving a maximum drag reduction of approximately 19.4% at a momentum coefficient of 0.0288, while harmonic forcing results in a maximum reduction of about 12%. The findings demonstrate that both forcing frequency and momentum input play a critical role in wake manipulation, with sub-harmonic forcing offering a more effective strategy at high Reynolds numbers.