Manuel Ferreira

Manuel Ferreira
University of Southampton · Faculty of Engineering and the Environment

PhD

About

12
Publications
2,423
Reads
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44
Citations
Citations since 2017
12 Research Items
44 Citations
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2017201820192020202120222023051015
2017201820192020202120222023051015
2017201820192020202120222023051015
Introduction
Manuel Ferreira currently works at the Faculty of Engineering and the Environment, University of Southampton. His most recent publication is 'An alternative floating element design for skin-friction measurement of turbulent wall flows'.

Publications

Publications (12)
Article
Mean-flow measurements of turbulent boundary layers over porous walls (permeable and rough) with varying pore size (s), permeability (K) and thickness (h) are presented across a wide range of friction Reynolds numbers (Reτ≈2000–18000) and permeability based Reynolds numbers (ReK≈1.5–60). The mean wall shear stress was determined using a floating el...
Article
We present a cross-correlation based analysis of the acoustic field generated in the wake of NACA 0012 and NACA 65410 aerofoils at a chord-based Reynolds number Rec = 75000 as obtained from pressure fields reconstructed from a series of planar time-resolved Particle Image Velocimetry (PIV) experiments. The experiments are performed in a water chann...
Article
Full-text available
In this experimental study, multiscale rough surfaces with regular (cuboid) elements are used to examine the effects of roughness-scale hierarchy on turbulent boundary layers. Three iterations have been used with a first iteration of large-scale cuboids onto which subsequent smaller cuboids are uniformly added, with their size decreasing with a pow...
Article
We experimentally investigate the surface drag characteristics of a staggered-distributed cube array and its interaction with the turbulent structure of the overlying flow. Instantaneous maps of the pressure field, inferred from in-plane velocity data are used to estimate the forces acting on a target roughness element. Coupled statistics of the fo...
Article
Full-text available
In the published article Ferreira and Ganapathisubramani (2020), Eq. (4) should read instead
Article
Full-text available
Real wind turbines experience a wide range of turbulent shear flows that naturally occur within the atmospheric boundary layer, however, these are often difficult to simulate in experiments. An active grid was used to expand the testable parameter space compared to conventional methods. Specific focus was placed on decoupling the shear from the tur...
Article
Full-text available
In-plane velocity measurements from PIV are used to estimate the pressure field above and within the canopy of two staggered arrays of cuboids, with distinct height distributions, via 2D-RANS and 2D-TH. The viability of this approach is examined by first comparing the mean drag profiles against reported wind-tunnel measurements that were carried ou...
Thesis
The sheer scale and nature of urban boundary layers present a number of practical challenges that make remarkably difficult to experimentally determine the aerodynamic characteristics of the surface roughness, or to obtain a complete description of the flow field within the canopy layer, including static-pressure measurements. Consequently, there i...
Conference Paper
Turbulent flow over the porous surface is one of the least documented problems, despite having the potential to affect a wide range of applications. This study presents an experimental investigation of turbulent boundary layer over open cell porous foam where the pore size and foam thickness are systematically varied. Hot-wire anemometry, Planar an...
Article
Full-text available
Indirect methods to estimate surface shear stress are commonly used to characterise rough-wall boundary-layer flows. The uncertainty is typically large and often insufficient to carry out quantitative analysis, especially for surface roughness where established scaling and similarity laws may not hold. It is, thus, preferable to rely instead on ind...
Conference Paper
Peak locking in stereoscopic particle image velocimetry (S-PIV) is often overlooked, albeit the existence of studies demonstrating an influence on turbulent statistics. Peak locking occurs when the seeding particles have an image diameter in the range of 1-2 pixels. Defocusing the camera lens slightly can conveniently address the problem. However,...

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