The present study involves a novel computational technique, regarding simultaneous use of the pseudo particle method, Poisson integral method and a special-purpose computer originally designed for molecular dynamics simulations (MDGRAPE-3). In the present calculations, the dynamics of two colliding vortex rings have been studied using the vortex method. The present acceleration technique allows...

This paper is about experimental results for partial reduction of vortex at vertical pipe intakes. One of the easiest and practical ways of reducing vortex effect is to use anti-vortex plates or baffles. These plates can be used to avoid the vortex completely or partially. This paper will concentrate on the latter case. Rectangular plates with different dimensions have been placed at different ...

Abstract The unsteady simulation of cylinder flow with inlet velocity disturbance is simulated and compared that without disturbance. POD adopted to analyze capture the dominant modes vortex street in wake. results show method efficient reconstructing field. When exists, number required reconstruct field accurately almost unchanged, but energy proportion each mode changes. larger frequency is, ...

Miniflaps at the trailing edge of airfoils (i.e., Gurney flaps) change the Kutta condition and thus produce higher lift. Unfortunately, however, the drag also increases due to the flow separation downstream of such modified trailing edges. The present work describes investigations aimed at the stabilization of the wake flow in order to achieve drag reduction and a decrease of sound generation. ...

In the context of dam breaks, tsunami, and flash floods, it is paramount to quantify the time-history of forces by the rapidly transient flow to vertical structures and the characteristics of the induced flow patterns. To resemble on-land tsunami-induced flow, a free-surface-piercing structure is exposed to long leading depression waves in a tsunami flume where long waves run up and down a 1:40...

in this paper the effect of block shape vortex generators (vgs) on an air-water fin-tube heat exchanger has been studied experimentally using exergy analysis method. also the effect of these vgs on increasing heat transfer rate has been simulated numerically and the results show a good agreement with the experiments. in this research we used a wind tunnel to produce wind flow over heat exchange...

This study conducted large-eddy simulations (LES) on the pollutant reduction effects of hedge and solid barriers in a three-dimensional idealized street canyon with an aspect ratio 0.5. The wind direction was perpendicular oblique (45°) to street. results were validated data from tunnel experiments. LES accurately predicted concentration distribution barrier-free case reproduced well barrier-in...

The aerodynamics of a stationary wing in turbulent wake are investigated. Force and velocity measurements used to describe the unsteady flow. Various wakes studied with different dominant frequencies length scales. In contrast pre-stall angles attack, time-averaged lift increases substantially at post-stall attack as interacts von Kármán vortex street experiences temporal variations effective a...