Almerindo D. Ferreira

Prediction of building interference effects on pedestrian level comfort

This paper presents results concerning the interference effect created by two auxiliary buildings located upstream of a recreation area comprising seven pavilions. Both numerical and experimental simulations were used to conduct the analyses, and the experimental and numerical results are compared against each other for vertical velocity profiles at different locations. For the numerical simulation, the RANS equations were solved with the turbulence formulated by the k2e RNG model. For the experimental work, a 1

Experimental and numerical simulation of flow around two-dimensional hills

Abstract The present work is devoted to the study of the turbulent isothermal flow around two-dimensional sinusoidal hills. In this work, both experimental and numerical approaches were followed. The experimental results were obtained from a simulation carried out in two wind tunnels, for a Reynolds number, based on the hills height, ranging from 1.8 × 10 4 to 2.5 × 10 5 . The results obtained experimentally comprise static wall pressure distributions, velocity profiles at strategic locations and flow visualisation. The algorithm adopted for the numerical simulation is based on a control volume approach applied to a numerically generated boundary fitted grid. The transport equations are solved using the SIMPLEC formulation, and turbulence is modelled with a modified low-Reynolds number k - ϵ model. The comparison between numerical and experimental results shows an overall good agreement.

Wind tunnel simulation of the flow around two-dimensional hills

Abstract An experimental investigation of flow around two-dimensional hills of sinusoidal cross-section is presented for Reynolds numbers in the range 1.7 × 10 4 −2.4 × 10 5 . The flow around a single hill with four different cross-sections is described by the pressure distribution on the surface of the models and by their topological features. The interaction between two identical hills is studied for varying distances. Pressure and shear-stress distributions on each hill are given, as well as vertical velocity profiles on the tops of the hills. The main properties of the flow obtained by flow visualization are shown.

Experimental and numerical study on the shear velocity distribution along one or two dunes in tandem

This paper investigates, experimentally and numerically, the shear velocity distribution along a single transverse dune and along two closely spaced dunes, analyzing the flow effects of one dune upon the other. The paper focuses on two-dimensional models simulating transverse sand dunes. The shape of the two pile geometries studied is described by sinusoidal curves, one having a maximum slope of

Characterization of shear stress distribution on a flat roof with solar collectors

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Full-scale measurements for evaluation of coal dust release from train wagons with two different shelter covers

and the other

Wind tunnel study of coal dust release from train wagons

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