Pore Scale Large Eddy Simulation of Flow in a Channel Partially Filled with Porous Block

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Abstract

Present work examines the turbulent feature of a flow passing over a fluid-saturated porous media in a channel using a detailed pore-scale large eddy simulation approach. Two different porous configurations (i.e., a packed bed of sphere and a porous block formed from rectangular cross-section ligament) are analysed and the results are compared against those obtained for the case when a solid block with the same size of the porous block is inserted in the channel. Results show that some portion of the fluid entering the porous blocks leave the porous structure to the clear region (positive leakage) through the porous-fluid interface. This is due to the negative vertical pressure gradient inside the porous region. The flow leakage leads to the formation of counter-rotating vortex pairs of the flow within and above the porous region, altering the coherent structures of the flow above the interface. Results indicate that although the fluid flow within the porous is highly vortical and experiences intense gradient, the turbulence fluctuations are limited because of the existence of porous ligaments and small-scale pores size. In comparison to the solid block case, the magnitude of the turbulent kinetic energy is decreased drastically above the porous block, since the reverse flow on the porous-fluid interface is deteriorated by the positive leakage as compared with the solid block.
Original languageEnglish
Publication statusPublished - Jul 2021

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