Boundary layer flow interaction with a permeable wall

Syamir Alihan Showkat Ali, Mahdi Azarpeyvand, Máté Szoke, Carlos Roberto Ilário Da Silva

Research output: Contribution to journalArticle (Academic Journal)peer-review

28 Citations (Scopus)
275 Downloads (Pure)

Abstract

The interaction of a zero pressure gradient turbulent boundary layer flow with a rough permeable surface has been investigated experimentally. The flow interaction characteristics have been examined using a long flat plate equipped with several surface pressure transducers and pressure taps. Three types of porous materials with different porosities and permeability constants were used in these investigations. To reveal the behavior of turbulent flows over porous surfaces, measurements were performed for the boundary layer growth, energy content of the turbulent structure within the boundary layer, and surface pressure fluctuations, before, over, and after the porous test-section. The interaction of the flow with the porous substrate was found to significantly alter the energy cascade within the boundary layer. Results have also shown that the boundary layer interaction with the rough porous surfaces leads to an increase in the pressure fluctuations exerted on the wall, particularly at low frequencies. The near-field investigations have shown that the penetration of the boundary layer flow into the porous medium can generate an internal hydrodynamic field within the porous medium. This, in turn, reduces the frequency-energy content of the large boundary layer coherent structures and their spanwise correlation length. This study paves the way for further investigation into the interaction of the porous media with different flow fields and development of tailored porous treatments for improving the aerodynamic and aeroacoustic performance of different aero- and hydro-components.

Original languageEnglish
Article number085111
Number of pages19
JournalPhysics of Fluids
Volume30
Issue number8
Early online date30 Aug 2018
DOIs
Publication statusPublished - Aug 2018

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