In this paper, we present a fast and accurate method for the combined detection and interactive visualization of vortex structures in 3D flow and their corresponding velocity field. Vortex surfaces are extracted by identifying vortex core lines in combination with isosurfaces of λ2. The velocity field on those vortex surfaces is visualized by a surface LIC method that works in image space. An e...

Evolution of vortices and their interactions are investigated in the Lagrangian context using the continuous vortex sheet method. Among the topics investigated are the numerical Helmholtz instability on a circular vortex sheet, the fractal-pattern instability on an expanding vortex spiral, interactions of vortices with shear layers, and some other phenomena related to experimental observations ...

We employ vortex grinding to generate a [2.2]paracyclophane in the organic solid state. The vortex grinding is aided with the addition of a small amount of liquid phase to facilitate topochemical [2 + 2] photodimerizations that generate the cyclophane stereoselectively and in up to quantitative yield. The use of the liquid phase increases the scope of the vortex method.

The vortex-blob method is extended to compute vortex sheet separation at a sharp edge. A smoothing parameter con­ trols the amount of detail occuring in the rolled-up spiral. Cal­ culations are presented for the case of vortex sheet roll-up due to an impulsively started flat plate.

In today's CFD-assisted turbomachinery design, a primary objective is to minimize the effects of vortices. Their automatic identification, along with other flow structures, in numerical data is a current research topic. This paper presents a novel method to find vortex hulls in turbomachinery flows automatically. Based on a vortex core line that is the centerline of the vortex, the method is ab...

The Optical Vortex Interferometer (OVI) is described in earlier paper as usefully tool to generate regular lattice of optical vortices (OVs) by interference of three plane wave. To practically use OVI in metrology method to localization of vortex points (VPs) is necessary. In this paper method with phase shift technique to VPs localisation is presented. Phase shift technique in this method is a...

An approximation method of Moore for Kelvin-Helmholtz instability is formulated as a general method for two-dimensional, incompressible, inviscid flows generated by a vortex sheet. In this method the nonlocal equations describing evolution of the sheet are approximated by a system of (local) differential equations. These equations are useful for predicting singularity formation on the sheet and...

This review paper offers both an overview of the recent developments in vortex statistics, and a detailed critical review of some of the advances as well as open problems in the area. A fruitful new direction in vortex dynamics concerns vortical systems with very large numbers of vortices in which statistical methods play a pivotal role. After a review of some of the older equilibrium statistic...

We propose a closed-loop control algorithm for vortex shedding in a separated diffuser. We introduce pulses of zero-net-mass injection (consecutive blowing and suction) together with an inverse vortex imaging method. This method estimates the circulation of a vortex in the separated region based on pressure at a limited number of observer points at the wall. The closed-loop algorithm determines...