Parallelized 3D optical flow method for fluid mechanics applications

International audienceIn this paper we address the problem of estimating the motion of fluids in 3D image sequences. We present a 3D extension of the second order div-curl regularization 2D optical flow equation first introduced by Corpetti et al.. In addition, we propose a multigrid and Message Passing Interface (MPI) parallelized implementation of the algorithm to handle the huge amount of data encountered in our applications. The performance of the resulting fluid flow estimator is demonstrated on a well representative motion synthetic pattern called Hill's spherical vortex. The suggested method should be a good alternative or complement to the well established techniques based on 3D cross correlation

L'effet de la diffusion vers l'avant sur les mesures spectroscopique d'extinction d'un écoulement de nanoparticules

status: publishe

Optical characterization of boundary layer transition in hypersonic flows

info:eu-repo/semantics/publishe

Schlieren visualization for high-speed flows based on laser-induced fluorescence

info:eu-repo/semantics/publishe

Temperature measurements of acetone flashing jet by laser induced fluorescence

status: publishe

On the Nature of Pressure Wave Propagation through Ducts for Structural Health Monitoring Application

An effective structural health monitoring system fully exploits the flexibility offered by the 3D printing process by integrating a smart structural health monitoring technology inside the 3D-printed components. The system relies on the propagation of pressure waves with constant propagation speed through circular capillaries embedded in the structure. The nature of these waves seems to be determinant for the accuracy of the crack localization system. To achieve a better physical understanding of the nature of the propagating waves through the capillaries, computational fluid dynamics simulations are performed and compared to experimental results obtained with a self-built test setup. The presence of propagating shock waves is observed in the simulations and experiments, as well as a complex reflection mechanism around the leak location. Shock waves show the characteristic of not propagating at a constant velocity. This property complicates the actual localization system. To solve this, the constant velocity assumption should be replaced with the effective velocity evolution to increase the localization accuracy. The amplitude of the shock wave is attenuated with propagating distance, which proves that the effect of friction plays an important role and can, in turn, influence the localization system

Study on breakup of liquid ligaments in hypersonic cross flow using laser sheet imaging and infrared light extinction spectroscopy

status: publishe