The wavelet-based vector multiresolution technique was proposed and applied to the post-processing of PIV results for identifying the multi-scale turbulent structures. By analyzing the instantaneous streamlines and vorticity fields of various scales the important information on the multi-scale flow structures was obtained. The large-scale vortices or coherent structures with a central scale of ...

The wavelet-based vector multiresolution technique was applied to the postprocessing of PIV results for identifying the multiscale turbulent structures of a lobed jet. By analyzing the instantaneous streamlines and vorticity fields of various scales, we obtained important information on the multiscale flow structures. The large-scale vortices or coherent structures with a central scale of a = 1...

We present a holographic PIV system which extends the standard PIV analysis scheme of two velocity components (2D2C) to the third dimension and overcomes the disturbing background light in deep volume images reconstructed from particle holograms. In a light-in-flight holography (LiFH) setup the short coherence length of a modified laser source is used to suppress light from out-of-focus regions...

High Performance Computing (HPC) applications are mapped to a cluster of multi-core processors communicating using high speed interconnects. More computational power is harnessed with the addition of hardware accelerators such as Graphics Processing Unit (GPU) cards and Field Programmable Gate Arrays (FPGAs). Particle Image Velocimetry (PIV) is an embarrassingly parallel application that can be...

The evaluation of the instantaneous three-dimensional pressure field from tomographic PIV data relies on the accurate estimate of the Lagrangian acceleration. To date, techniques to reconstruct the Lagrangian trajectories from velocity fields obtained by Tomo-PIV have been used. Nevertheless, the reconstruction of relatively long trajectories, beneficial for the reduction of the precision error...

We analyze representative ill-posed scenarios of tomographic PIV with a focus on conditions for unique volume reconstruction. Based on sparse random seedings of a region of interest with small particles, the corresponding systems of linear projection equations are probabilistically analyzed in order to determine (i) the ability of unique reconstruction in terms of the imaging geometry and the c...

We introduce a novel class of algorithms for evaluating PIV image pairs. The mathematical basis is a continuous variational formulation for globally estimating the optical flow vector fields over the whole image. This class of approaches has been known in the field of image processing and computer vision for more than two decades but apparently has not been applied to PIV image pairs so far. We...

A simultaneous measurement technique for the velocity distributions and scholar distributions, e.g., pressure, temperature, and so on, has been proposed. It visualized the spatial distribution using the multi-purpose particles, which has been coated with pressure-sensitive dye. The proposed particle technique, called the PSParticle method, is a hybrid system combining the technologies of pressu...

Peripheral intravenous catheters (PIVs) are mainstays of modern medical intervention, placed in >25 million US patients annually1 and in at least 44% of pediatric inpatients.2 Although PIVs are often essential for delivering medications, hydration, and nutrition to ill children, they are not without consequence or cost. In this issue of Hospital Pediatrics, Goff et al detail specifi c PIV inser...

We present the Protected-IV construction (PIV) a simple, modular method for building variable-input-length tweakable ciphers. At our level of abstraction, many interesting design opportunities surface. For example, an obvious pathway to building beyond birthday-bound secure tweakable ciphers with performance competitive with existing birthday-bound-limited constructions. As part of our design s...