November 30, 2020 /

SFB 1313 Publication "Transport of Turbulence Across Permeable Interface in a Turbulent Channel Flow: Interface-Resolved Direct Numerical Simulation"

Authors: Xu Chu, Wenkang Wang, Guang Yang, Alexandros Terzis, Rainer Helmig, Bernhard Weigand
Scientific Journal: Transport in Porous Media

New SFB 1313 publication, published in Transport in Porous Media:

"Transport of Turbulence Across Permeable Interface in a Turbulent Channel Flow: Interface-Resolved Direct Numerical Simulation"

Authors
Abstract

Turbulence transportation across permeable interfaces is investigated using direct numerical simulation, and the connection between the turbulent surface flow and the pore flow is explored. The porous media domain is constructed with an in-line arranged circular cylinder array. The effects of Reynolds number and porosity are also investigated by comparing cases with two Reynolds numbers (Re≈3000,6000) and two porosities (φ=0.5,0.8). It was found that the change of porosity leads to the variation of flow motions near the interface region, which further affect turbulence transportation below the interface. The turbulent kinetic energy (TKE) budget shows that turbulent diffusion and pressure transportation work as energy sink and source alternatively, which suggests a possible route for turbulence transferring into porous region. Further analysis on the spectral TKE budget reveals the role of modes of different wavelengths. A major finding is that mean convection not only affects the distribution of TKE in spatial space, but also in scale space. The permeability of the wall also have an major impact on the occurrence ratio between blow and suction events as well as their corresponding flow structures, which can be related to the change of the Kármán constant of the mean velocity profile.

This picture showsXu Chu
Dr.-Ing.

Xu Chu

Postdoctoral Researcher, Research Project A02

This picture showsRainer Helmig
Prof. Dr.-Ing.

Rainer Helmig

Spokesman, Principal Investigator, Research Projects A02 and C02, Central Project Z

This picture showsBernhard Weigand
Prof. Dr.-Ing.

Bernhard Weigand

Principal Investigator, Research Project A02

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