Separation control applied to the turbulent flow around a NACA4412 wing section

• DOI: 10.48550/arxiv.2502.07910
• Publication Date: 2025-02-11
• Authors: Yuning Wang; Fermin Mallor; Carlos Guardiola; R. Mariani; Ricardo Vinuesa
• Keywords: Section (typography); Separation (statistics); Flow Control

We carried out high-resolution large-eddy simulations (LESs) to investigate the effects of several separation-control approaches on a NACA4412 wing section with spanwise width $L_z = 0.6$ at an angle attack $AoA=11^{\circ}$ Reynolds number $Re_c 200,000$ based chord length $c$ and free-stream velocity $U_{\infty}$. Two control strategies were considered: (1) steady uniform blowing and/or suction pressure sides, (2) periodic side. A wide range configurations evaluated in terms aerodynamic efficiency (i.e., lift-to-drag ratio) separation delay. Uniform effectively delayed flow separation, leading lift increase up $11\%$, but yielded only marginal improvements efficiency. In contrast, neither enhanced delay nor improved detailed analysis interaction between turbulent boundary layers (TBLs) over was performed, including assessments integral boundary-layer quantities, turbulence statistics, (3) power-spectral densities. Significant modifications stresses spectral characteristics observed. To authors' best knowledge, this is first numerical study utilizing LESs provide comprehensive control.