El‐Sayed Zanoun
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View article: Laminar Pipe Flow Instability: A Theoretical-Experimental Perspective
Laminar Pipe Flow Instability: A Theoretical-Experimental Perspective Open
This paper revisits the theoretically predicted inherent stability of fully developed laminar pipe flow, which remains unconfirmed by experimental evidence. A recently developed theory of pipe-flow stability/instability addresses the gap b…
View article: Numerical and experimental investigations of flow separation control through a linear compressor cascade
Numerical and experimental investigations of flow separation control through a linear compressor cascade Open
Modern large-scale gas turbines are equipped with high-pressure ratio compressors to increase engine work and its overall efficiency. Flow separation and energy losses are also two interrelated phenomenon associated with changes in compres…
View article: Reynolds number dependence of azimuthal and streamwise pipe flow structures
Reynolds number dependence of azimuthal and streamwise pipe flow structures Open
This paper revisits the study by Bailey et al. ( J. Fluid Mech. , vol. 615, 2008, pp. 121–138), adopting a higher-fidelity calibration approach to reveal subtle flow variations with Reynolds numbers that were not discernible previously. Th…
View article: Numerical and experimental investigations of flow separation control through a linear compressor cascade
Numerical and experimental investigations of flow separation control through a linear compressor cascade Open
Modern large-scale gas turbines are equipped with high-pressure ratio compressors to increase engine work and its overall efficiency. Flow separation and energy losses are also two interrelated phenomenon associated with changes in compres…
View article: Pipe Flow Development and Transition in CoSmaPipe Facility
Pipe Flow Development and Transition in CoSmaPipe Facility Open
The current research focuses on understanding the transition of pipe flow by using a triggering device. In particular, a transition rod was installed within the CoSma‐Pipe at the Brandenburg University of Technology Cottbus‐Senftenberg. Th…
View article: Two‐Point Velocity Correlations in Fully Developed Turbulent Pipe Flow at Shear Reynolds Number of <i>Re</i><sub>τ</sub> ≈ 4000
Two‐Point Velocity Correlations in Fully Developed Turbulent Pipe Flow at Shear Reynolds Number of <i>Re</i><sub>τ</sub> ≈ 4000 Open
The aim of this study is to report about the large‐scale pipe flow structures using the two‐point velocity correlations at a radial location of y/R = 0.5 and 41 azimuthal positions for shear Reynolds number Re τ ≈ 4000. The streamwise velo…
View article: Investigation of Large Scale Motion Interaction with the Near‐Wall Turbulence
Investigation of Large Scale Motion Interaction with the Near‐Wall Turbulence Open
The main objective of the current work is to better understand the interaction of pipe flow large‐scale structures in the outer region with the near‐wall turbulence. To do so, a decomposition of velocity fluctuating signals has been adopte…
View article: One-Dimensional Flow Spectra and Cumulative Energy from Two Pipe Facilities
One-Dimensional Flow Spectra and Cumulative Energy from Two Pipe Facilities Open
Experiments have been conducted to assess the sizes and energy fractions of structure in fully developed turbulent pipe flow regime in two pipe facilities, ColaPipe at BTU Cottbus-Senftenberg, and CICLoPE at University of Bologna, for shea…
View article: Spectral Analysis of Large Scale Structures in Fully Developed Turbulent Pipe Flow
Spectral Analysis of Large Scale Structures in Fully Developed Turbulent Pipe Flow Open
The present work focuses on spectral analysis of the streamwise velocity fluctuations obtained, utilizing the Cottbus Large Pipe (CoLaPipe) test facility for R + ≤ 3500, where R + is the Reynolds number based on the wall friction velocity,…
View article: Flow characteristics in low-speed wind tunnel contractions: Simulation and testing
Flow characteristics in low-speed wind tunnel contractions: Simulation and testing Open
A numerical and experimental study was conducted to characterize flow through low-speed wind tunnel contractions. The simulations were carried out using an incompressible, two-dimensional flow solver based on finite volume scheme, predicti…