In the current paper, methods of calculating infiltration for different ways ventilation system operation have been reviewed. The calculation losses buildings in cases organizing natural and mechanical supply exhaust ventilation, as well recent scientific research this area, has considered. with values air exchange given Set Rules 54.13330.2016 “Residential multi-apartment buildings” compared t...

In this paper, the low-speed aerodynamic performance of lambda wing with a chord length c=210 mm and sweep angle Λ =51°, thickness 3 mm, beveled leading edges on windward side an 58° is investigated numerically. Reynolds Average Navier Stokes (RANS) theorem equations Spalart-Allmaras turbulence model were solved up to attack 45° for incompressible flow around surface and, are compared experimen...

Implicit large-eddy simulation/Reynolds-averaged Navier-Stokes hybrid simulation of sheet-like hydrogen jets in a supersonic crossflow are performed to investigate jet mixing, focusing on the difference flow structures between and round jets. The is validated with helium experiment terms mean concentration. numerical results showed good agreement experimental results. A characteristic injection...

This study focuses on the theoretical aspect of topographic scattering induced by a shallow asymmetric V-shaped canyon under plane shear horizontal-wave incidence. An analytical approach, based on the region-matching technique, is applied to derive a rigorous series solution, which is more general than that in a previous study. For the wave functions constrained in two angular directions, a nov...

In this paper, the relation between skin friction and heat transfer along windward sides of blunt-nosed bodies in hypersonic flows is investigated. The self-similar boundary layer analysis is accepted to figure out the distribution of the ratio of skin friction to heat transfer coefficients along the wall. It is theoretically obtained that the ratio depends linearly on the local slope angle of ...

In this paper, we have investigated the effect of uncertainties on the interactions of a bubble with a shock, based on a widely studied experiment case of helium-air shockbubble interaction. Gas contamination inside the bubble and deformation of the initial bubble shape were selected as the uncertainty parameters, and the statistics of the interface evolution and the primary baroclinic vorticit...

The regional climate model HIRHAM has been applied over the Asian continent from 0oN to 50oN and 42oE to 110oE to simulate the Indian monsoon circulation under past and present-day conditions. The model is driven at the lateral and lower boundaries by the atmospheric output fields of the global coupled Earth system model ECHAM5JSBACH/MPIOM for 44-years-long time slices during the mid-Holocene a...

Urban forests have been shown to be efficient for reducing air pollutants especially for particulate matters (PMs). This study aims to reveal the PM blocking capacity of two common artificial landscape species, Sabina chinensis and Liriodendron chinense and to investigate spatial-temporal heterogeneities by estimating the vegetation collection velocity of coarse (PM10) and fine particles (PM2.5...

Numerical flow models have been widely applied in engineering disciplines for many years. In the last few years, there has been a proliferation of the use of Computational Fluid Dynamics (CFD) in the fields of geomorphology and hydrology (see Bates and Lane, 1998). These models enable an improved simulation of important processes providing prediction fields that allow considerable insight into ...

to enhance the understanding of the impact of obstacle buildings on pollution transportationand dispersion in the atmospheric boundary layer, it is necessary to know the atmospheric flow characteristics over terrains. wind flow characteristics in a boundary layer over a step-shaped cliff topography model with rough and smooth surfaces were studied numerically using computational fluid dynamics ...