Pore-Scale Large Eddy Simulations of Turbulent Flow in a Composite Porous-Fluid System

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Abstract

In the present study, the flow features for a channel partially filled with two different porous blocks and a solid block are investigated numerically using a detailed pore-scale large eddy simulation (LES) approach. The effect of the porous block on the coherent structures and large reverse flow patterns along the top surface of the blocks are investigated and compared with the solid block. Moreover, characteristics of the wake flow and the flow leakage from the porous region to the clear flow through the porous-fluid interface are examined in detail.
Pore-scale LES results show that some portion of the fluid entering the porous blocks is pushed upwards toward the porous-fluid interface due to the negative vertical pressure gradient inside the porous block and leaves the porous structures to the clear region (positive leakage). This tendency of flow leads to a formation of counter-rotating vortex pairs (CRVPs) of the fluid flow within and above the porous block and changes the coherent structures above the porous-fluid interface. It is also argued that the magnitudes of turbulent kinetic energy and turbulent velocity fluctuations are decreased drastically over the porous block as compared with the solid block since the reverse flow on the porous-fluid interface is deteriorated by the positive leakage.
Original languageEnglish
Title of host publicationUK Fluids Conference
Publication statusPublished - 8 Sept 2021

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