Abstract Dynamic stall under large Reynolds numbers and reduced frequencies has a significant effect on the performance of wind turbine blades, helicopter rotors, etc. So dynamic physics NACA0012 airfoil number Re = 1.5 × 10 6 was studied using experimental numerical methods. The frequency range k 0.035 – 0.1. unsteady flow field in detail by transient pressure measurement simulation based Reyn...

Flow-induced noise hybrid prediction method based on sound wave boundary condition is an effective numerical to deal with a flow-induced problems of complex configuration. This can not only finely simulate the source, but also analyze propagation characteristics. In this paper, methods such as space-time discrete scheme and conditions involved in solution acoustic perturbation equations(APE) ar...

To investigate the manoeuvring performance of a body-caudal fin robot fish, numerical framework combining computational fluid dynamics and multi-body with closed-loop control algorithm was established in this study. Within framework, we modelled swimmer as system shape NACA0012 hydrofoil. The investigated by using different curvature magnitudes distributions along centre line (the is defined me...

We conducted a study on unsteady characteristics of fluid-dynamic force acting pitching NACA0012 wing with linear leading edge (Baseline) and protuberance (Wave) in low Reynolds number region (Re =4.32×104) for the development fish-type autonomous underwater vehicle. To investigate effect motion force, measurement flow visualization were by using wind tunnel. In case Baseline, increase frequenc...

in this research, shock wave motion, shock/boundary layer interaction, and flow separation in a transonic flow over a naca0012 airfoil were investigated experimentally. thirteen kulite sensors were utilized for measurement of pressure fluctuations over the airfoil. experiments were performed for angles of attack between -4 to 4 degrees and flow mach numbers of m= 0.39 to 0.82. the kulite sensor...

Tonal noise emitted from the trailing edge of an airfoil is considered using modal analysis techniques to investigate secondary quadrupole tones. We examine origin sound generated two-dimensional unsteady laminar flow over a NACA0012 airfoil. In this paper, we consider two configurations at Mach numbers $M_\infty = 0.1$ and 0.05 that lead different acoustic characteristics: former has significa...

Abstract For the design of wind turbines, airfoil optimization is widely required as operation efficiency turbines closely dependent on aerodynamic performance, where accuracy method great importance. In this paper, a machine learning-based algorithm proposed to improve performance. A low-speed NACA0012 selected original for optimization. The class-shape-transformation (CST) used construct geom...

Extremum seeking control (ESC) and its slope generalization are applied in a high-fidelity flow simulation framework for reduction of acoustic noise generated by NACA0012 airfoil. Two Reynolds numbers studied which different generation mechanisms excited. For low number flow, the scattering vortex shedding at airfoil trailing edge produces tonal noise, while moderate case, boundary-layer instab...

This paper presents an investigation on the capability of gust load alleviation by normal microjet. The numerical method integrates unsteady Reynolds averaged Navier-Stokes (URANS) solutions, structural dynamic equations motion and Field Velocity Method. is verified for responses rigid elastic models. results microjet are validated against experimental previous data. Load control capabilities e...