The paper investigates the applicability of variational data assimilation approach to reconstruct three-dimensional wind flows around a high-rise building model, and provides guidelines towards an efficient reconstruction. objective is determine best distributed control parameters based on Reynolds-averaged-Navier–Stokes (RANS) model coupled with pressure data. strategy considers additive forci...

This report identifies mechanisms and techniques for the efficient cooperation among heterogeneous radio access networks (RANs), with focus on the cooperation between the WINNER RAN and legacy RANs (GSM/GPRS/UMTS and IEEE 802.11, 802.16, and DVB). The report has two main parts. The first part is an initial description of cooperation architectures and coupling schemes, later to be analyzed for o...

The requirement that physical quantities not vary with a hybrid LESRANS model’s blending parameter imposes conditions on the computation that lead to better results across LES-RANS transitions. This promises to allow placement of those transitions so that LES is performed only where required by the physics, improving computational efficiency. The approach is applied to separated flow past perio...

The SYSTRAN system (produced by Latsec Incorporated) has been applied in the fo l lowing areas: I ) Pr ivate companies in Canada use i t fo r t rans la t ing engineering documents from English in to French. 2) NASA used i t to communicate with the crews of the Apol lo and Soyuz spaceships, t rans la t ing between Russian and English. 3) The EEC uses i t f o r examining the f e a s i b i l i t y...

The effect of supersonic air temperature on the mixing characteristics liquid hydrocarbon fuel injected into three different airflows elevated in steps from 373 K to 673 was investigated numerically. Compressible Reynolds-averaged Navier–Stokes (RANS) equations were solved together with species conservation equation using ANSYS Fluent for two-phase flow simulations including droplet breakup and...

In the design of flow geometries consisting channels such as high-temperature gas heat exchangers, a great number parameters can be chosen, why solving turbulent Reynolds Averaged Navier-Stokes (RANS) equations by CFD coupled with other physics become computational demanding. Therefore, we here propose method for significant reduction resources and consequent high speed. This is done using less...

Accurate and reliable CFD simulation of temperature stratification in indoor environment is needed for the design and evaluation of displacement ventilation in buildings. This paper presents a detailed and systematic evaluation of the capability of 3D steady RANS CFD simulations to predict the temperature stratification in a room. The evaluation is based on sensitivity analysis and validation w...

Validation simulations are presented for turbulent flow in a staggered tube bank, geometry similar to the lower plenum of a gas-cooled high temperature reactor. Steady 2D RANS results are compared to unsteady 2D RANS results and experiment. The unsteady calculations account for the fact that nonturbulent fluctuations (due to vortex-shedding) are present in the flow. The unsteady computations ar...

The majority of industrial computational fluid dynamics simulations are steady. Such simulations therefore require numerical methods which can rapidly converge a boundary value problem, typically either the Euler or Reynolds-averaged Navier–Stokes (RANS) equations. In this chapter we outline two major approaches: time-marching methods built on top of Runge–Kutta time-stepping schemes and Newton...