Consultation des résumés par auteur > Chikkamath Deepa

We investigate the motion of a pendulum immersed in a grid generated turbulent flow with dimensions comparable to the integral length scale. We vary the wind velocity and the ratio between the pendulum size and the integral length scale using different grid geometries and different pendulum sizes. We obtain the baseline using the free pendulum oscillations extracting the intrinsic natural frequency and the response of the pendulum to turbulence forcing. 

To characterize turbulence forcing parameters, we use an external motor to provide harmonic driving. This mechanism dominates the pendulum's response at the driving frequency, providing a controlled baseline to extract the parameters of turbulence forcing. Our results indicate that the effective natural frequency remains largely constant as turbulence intensity increases. However, the turbulence forcing is highly sensitive to the effective natural frequency. Notably, the damping rate scales linearly with the mean wind speed which suggests the applicability of linear response theory. Finally, we use the response of the pendulum to the wind to reconstruct effective forcing.