3D-PTV measurements of the wake of a sphere

Abstract

3D-PTV measurements were conducted on the wake of a sphere. The Reynolds number is 1130 with diameter d = 30 mm. The measurement system consisted of three CCD cameras, an image grabber, an Ar-ion laser and a host computer. Structural analysis was adopted for the analysis on the wake using the obtained velocity profiles. Statistical turbulent properties were quantitatively clarified using the time-consecutive instantaneous three-dimensional vectors obtained by the 3D-PTV system. The spatial velocity profiles of the sphere wake seemed to have a strong relationship with the spiral motion of the vortices that were shed from the surface of the sphere.

3D-PTV Measuring onBubble and Liquid Velocities of a Single Bubble Jet

“…The 3D-PTV has the following advantages: (1) there exists no sensor which disturbs flow; (2) we get the information of many points in space at the same time; (3) we get three-dimensional information in a whole test volume (see Doh et al (2002Doh et al ( , 2004 (9) & (10) ).…”

The capturing of turbulent gas flows using multiple Kinects

“…The extension to tracing flowing particles in consecutive images is called particle tracing velocimetry (PTV). A method to apply PTV of a turbulent flow in 3D has been presented by Doh et al [8]. Still, given only the images of two adjacent time frames, estimating the correlation of a multitude of particle points is an ill-posed problem.…”

Non-contact 3D flow-structure interaction measurement (FSIM) system for motion and flow fields

“…In this study, Sr was set to 20 pixels and Sr' to 15 pixels. The algorithm for the acquisition of the 3D vector fields is the same used in the studies of Doh et al (2004). …”

“…The performance of the 3D-PTV system adopted in this study can be referenced by the studies made by Doh et al (2002Doh et al ( , 2004. Accordingly, the performance test on the 6DOF-Motion system only is made.…”