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Direct numerical simulation of turbulent channel flow over porous walls

Published online by Cambridge University Press:  04 November 2015

Marco E. Rosti Open the ORCID record for Marco E. Rosti [Opens in a new window] ,
Luca Cortelezzi  and
Maurizio Quadrio
Marco E. Rosti
Affiliation:
Department of Aerospace Science and Technology, Politecnico di Milano, Campus Bovisa, 20136 Milano, Italy
Luca Cortelezzi
Affiliation:
Department of Mechanical Engineering, McGill University, Montreal, Quebec H3A 2K6, Canada
Maurizio Quadrio*
Affiliation:
Department of Aerospace Science and Technology, Politecnico di Milano, Campus Bovisa, 20136 Milano, Italy
*
†Email address for correspondence: maurizio.quadrio@polimi.it
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Abstract

We perform direct numerical simulations (DNS) of a turbulent channel flow over porous walls. In the fluid region the flow is governed by the incompressible Navier–Stokes (NS) equations, while in the porous layers the volume-averaged Navier–Stokes (VANS) equations are used, which are obtained by volume-averaging the microscopic flow field over a small volume that is larger than the typical dimensions of the pores. In this way the porous medium has a continuum description, and can be specified without the need of a detailed knowledge of the pore microstructure by independently assigning permeability and porosity. At the interface between the porous material and the fluid region, momentum-transfer conditions are applied, in which an available coefficient related to the unknown structure of the interface can be used as an error estimate. To set up the numerical problem, the velocity–vorticity formulation of the coupled NS and VANS equations is derived and implemented in a pseudo-spectral DNS solver. Most of the simulations are carried out at $Re_{{\it\tau}}=180$ and consider low-permeability materials; a parameter study is used to describe the role played by permeability, porosity, thickness of the porous material, and the coefficient of the momentum-transfer interface conditions. Among them permeability, even when very small, is shown to play a major role in determining the response of the channel flow to the permeable wall. Turbulence statistics and instantaneous flow fields, in comparative form to the flow over a smooth impermeable wall, are used to understand the main changes introduced by the porous material. A simulation at higher Reynolds number is used to illustrate the main scaling quantities.

JFM classification

Low-Reynolds-number flows: Porous media Turbulent Flows: Turbulent boundary layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 784 , 10 December 2015 , pp. 396 - 442
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Copyright
© 2015 Cambridge University Press 

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Footnotes

‡

Present address: Aeronautical and Mechanical Engineering, City University London, Northampton Square, London EC1V 0HB, UK.

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