We conducted isothermal large-eddy simulations to generate the velocity and concentration distributions investigate air pollution transport from outside inside of a space surrounded by urban-like block arrays. Contrary previous study, we assumed that in form scalars are generated outdoors not indoors which placed at: 1) middle window, 2) near window wall, 3) street canyon at ground level, 4) le...

Thewake flow behind two yawed side-by-sidecircular cylinders is investigated using athree-dimensional vorticity probe. Four yaw angles (α), namely, 0°, 15°, 30° and 45° and twocylinder spacing ratios T of 1.7 and 3.0 were tested. For T = 3.0, there exist two vortex streets and the cylinders behave as independent and isolated ones. The maximum contour value of the coherent streamwise vorticity *...

An extension of the well-known Neville–Aitken's algorithm for interpolation on Grassmann manifold G m ( ? n ) in framework parametric model order reduction is presented. Interpolation points are subspaces spanned by bases obtained Proper Orthogonal Decomposition available solutions associated with chosen parameter sampling. The performed recursively via geodesic barycenter two points. Three CFD...

Most fishes commonly experience unsteady flows and hydrodynamic perturbations during their lifetime. In this study, we provide evidence that rainbow trout Oncorhynchus mykiss voluntarily alter their body kinematics when interacting with vortices present in the environment that are not self-generated. To demonstrate this, we measured axial swimming kinematics in response to changes in known hydr...

The street garment vendors are playing a significant role in the fields of the economic development through protecting resources (garment products) from such a position where they are treated as wastes; very much less valued products and creating the opportunity for self-employment. This study aimed at showing the economic contribution and the impact of the street vendors to the local community...

This paper explores an idealized model of the ocean surface in which widely separated surface-wave packets and point vortices interact two horizontal dimensions. We start with a Lagrangian which, its general form, depends on \emph{fields} wave action, phase, stream function, additional fields that label track vertical component vorticity. By assuming action vorticity are confined to infinitesim...

Introduction: Children, who work or live at streets, are one of the HIV high risk groups in Iran, with no comprehensive preventive programs. This study intended to assess substance use among street children in Tehran, Capital of Iran. Methods: This paper is a part of comprehensive rapid assessment and response (RAR) research on street children in Tehran i...

The kinematics and hydrodynamics of free-swimming mayfly larvae (Chloeon dipterum) were investigated with the aid of a simple wake visualisation technique (tracer dyes) and drag measurements on dead insects. The basic swimming movement consists of a high-amplitude dorso-ventral undulation and, during continuous swimming, this produces a wake of ring vortices shed alternately to the dorsal and v...

Harbor seals (Phoca vitulina) often live in dark and turbid waters, where their mystacial vibrissae, or whiskers, play an important role in orientation. Besides detecting and discriminating objects by direct touch, harbor seals use their whiskers to analyze water movements, for example those generated by prey fish or by conspecifics. Even the weak water movements left behind by objects that hav...